MAX3222CAP+T中文资料 - 360文档中心

MAX3232 规格书

MAX3222/MAX3232/MAX3237/MAX3241*3.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.5MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T(m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors6_____________________________________________________________________________________________________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX3241_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = G ND), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as LapLink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.3.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________7M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors8_______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors10______________________________________________________________________________________Figure 4b. Mouse Driver Test Circuit Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________11High Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.T1IN R1OUTV CC = 3.3VT1OUT 5V/div5V/div5V/div5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241_____________________________________Typical Operating Circuits (continued)3.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________13M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors14___________________________________________________________________________________________________________________________________Pin Configurations (continued)MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________15______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.PARTTEMP RANGEPIN-PACKAGE PKG CODE MAX3222EUP+ -40°C to +85°C 20 TSSOP U20+2 MAX3222EAP+ -40°C to +85°C 20 SSOP A20+1 MAX3222EWN+ -40°C to +85°C 18 SO W18+1 MAX3222EPN+ -40°C to +85°C 18 Plastic Dip P18+5 MAX3222C/D 0°C to +70°C Dice* — MAX3232CUE+0°C to +70°C 16 TSSOP U16+1 MAX3232CSE+ 0°C to +70°C 16 Narrow SO S16+1 MAX3232CWE+ 0°C to +70°C 16 Wide SO W16+1 MAX3232CPE+0°C to +70°C16 Plastic DIP P16+1 MAX3232EUE+ -40°C to +85°C 16 TSSOP U16+1 MAX3232ESE+ -40°C to +85°C16 Narrow SOS16+5PARTTEMP RANGEPIN-PACKAGE PKG CODE MAX3232EWE+ -40°C to +85°C 16 Wide SO W16+1 MAX3232EPE+ -40°C to +85°C 16 Plastic DIP P16+1 MAX3232CAE+ 0°C to +70°C 16 SSOP A28+2 MAX3237CAI+ 0°C to +70°C 28 SSOP A28+1 MAX3237ENI+ -40°C to +85°C28 SSOP A28+1 MAX3241CAI+ 0°C to +70°C 28 SSOP A28+1 MAX3241CWI+0°C to +70°C28 SO W28+6 MAX3241EUI+ -40°C to +85°C 28 TSSOP U28+2 MAX3241EAI+ -40°C to +85°C 28 SSOP A28+1 MAX3241EWI+ -40°C to +85°C28 SOW28+6M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors16_________________________________________________________________________________________________________Chip Topography___________________Chip InformationT1INT2IN 0.087"(2.209mm)R2OUTR2IN T2OUTTRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GND3.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External CapacitorsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________17©2007 Maxim Integrated ProductsMaxim is a registered trademark of Maxim Integrated Products, Inc.MAX3222/MAX3232/MAX3237/MAX3241Package Information(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,go to /packages .)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17。

MAX232中文资料,MAX232CPE,MAX232EPE,MAX232ECPE,规格书,MAXIM代理商,datasheet,PDF

深圳市万瑞尔科技有限公司 MAXIM代理商 0755-28269789
19-4323; Rev 15; 13;5V ‫ޥ‬٫Ă‫ۂ‬໼‫ ل‬RS-232 ഝ‫ڑ‬ಹ/ेฏಹ
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MAX220–MAX249࿅઼࿯ഝ‫ڑ‬ಹ /ेฏಹǈከཛྷEIA/TIA232EჾࣆV.28/V.24໼ဳेਊහࣜǈᅐದกྐۨ໗‫ ޥ‬±12V ٫ᆚ‫و‬ᄮᅋă
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1.0 (0.1) 0.1 — — 1.0 (0.1) — 1.0 (0.1) 1.0 (0.1) 1.0 (0.1) 1.0 (0.1)
1.0 1.0 (0.1) 0.1 0.1 1.0 — — — 1.0 1.0
SHDN & ThreeState No Yes Yes Yes Yes No
No No No No No Yes Yes No No No
_____________________________________________________________________ ၭျӹ
Part Number MAX220 MAX222 MAX223 (MAX213) MAX225 MAX230 (MAX200) MAX231 (MAX201)
MAX232 (MAX202) MAX232A MAX233 (MAX203) MAX233A MAX234 (MAX204) MAX235 (MAX205) MAX236 (MAX206) MAX237 (MAX207) MAX238 (MAX208) MAX239 (MAX209)

MAX3232EEAE+T中文资料

A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a +3.3V supply. Each device guarantees operation at data rates of 250kbps while maintaining RS-232 output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232compliant output levels.
Battery-Powered Equipment Cell Phones Cell-Phone Data Cables Notebook, Subnotebook, and Palmtop Computers
Applications
Printers Smart Phones xDSL Modems
MAX3222EEPN -40°C to +85°C 18 Plastic DIP —
MAX3232ECAE 0°C to +70°C 16 SSOP
—

MAX3225EUP-T中文资料

Peripherals Printers
MAX3224 MAX3225 MAX3226 MAX3227 MAX3244 MAX3245 AutoShutdownPlus, MegaBaud, and UCSP are trademarks of Maxim Integrated Products, Inc.
†Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; 5,649,210; and other patents pending.
________________________________________________________________ Maxim Integrated Products
VCC to GND ..............................................................-0.3V to +6V V+ to GND (Note 1) ..................................................-0.3V to +7V V- to GND (Note 1) ...................................................+0.3V to -7V V+ + V-(Note 1) ................................................................+13V Input Voltages T_IN, FORCEON, FORCEOFF to GND ................ -0.3V to +6V R_IN to GND ....................................................................±25V Output Voltages T_OUT to GND.............................................................±13.2V R_OUT, INVALID, READY to GND .........-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT to GND .......................................................Continuous Continuous Power Dissipation (TA = +70°C) 16-Pin SSOP (derate 7.14mW/°C above +70°C) .........571mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...889mW 20-Pin TQFN (derate 21.3mW/°C above +70°C)........1702.1mW 20-Pin SSOP (derate 8.00mW/°C above +70°C) .........640mW 20-Pin TSSOP (derate 7.00mW/°C above +70°C) .......559mW 28-Pin Wide SO (derate 12.5mW/°C above +70°C)........... 1W 28-Pin SSOP (derate 9.52mW/°C above +70°C) .........762mW Operating Temperature Ranges MAX32_ _C_ _....................................................0°C to +70°C MAX32_ _E_ _ ..................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C

MAX320-MAX322中文资料

ELECTRICAL CHARACTERISTICS
(V+ = +5V ±10%, V- = -5V ±10%, VINH = 3.5V, VINL = 2.5V, TA = TMIN to TMAX, unless otherwise noted.)
PARAMETER ANALOG SWITCH Analog Signal Range
For equivalent devices specified for single-supply operation, see the MAX323/MAX324/MAX325 data sheet. For quad versions of these switches, see the MAX391/MAX392/MAX393 data sheet.
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW Narrow SO (derate 5.88mW/°C above +70°C) .............471mW
µMAX (derate 4.10mW/°C above +70°C) .....................330mW CERDIP (derate 8.00mW/°C above +70°C) ..................640mW Operating Temperature Ranges MAX32_C_ _ ........................................................0°C to +70°C MAX32_E_ _......................................................-40°C to +85°C MAX32_MJA ...................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C

MAX3232中文资料_数据手册_参数

万联芯城-电子元器件采购网，提供一站式配套，解决物料烦恼，万联芯城-以良心做好良芯，专为终端工厂企业客户提供电子元器件一站式配套报价服务，客户提交物料清单，商城即可整单报价，整单下单有优惠，万联芯城现货库存销售能够满足多种客户的物料需求，一站式报价为客户节省采购成本，点1MBPS，真正的RS-232收发器使用四个0.1μF外部电容器电源去耦在大多数情况下，一个0.1μF的旁路电容是充足.在对电源敏感的应用中，电源噪声，用电容将V CC 去耦到地与电荷泵电容器C1的值相同.连旁路电容尽可能靠近IC.操作低至2.7V发射机输出将符合EIA / TIA-562的等级 ±3.7V，电源电压低至2.7V.变送器输出时退出关机图3显示了退出时的两个变送器输出关机模式.当它们变得活跃时，显示的分路器输出将与RS-232相反 - （一个发射器输入高，另一个低）.每个发射器都装有3K Ω并联 2500PF的.变送器输出不显示振铃或当它们从停机状态退出时，会产生不希望的瞬变.请注意，变送器仅在使用时才能启用 V-的量值超过大约3V.鼠标可驾驶性 MAX3241专门设计用于供电串口鼠标，同时使用低压电源供电，层数. 它已经通过了领先的鼠标品牌进行了测试制造商如微软和罗技.该 MAX3241成功驱动所有经过测试的串口鼠标满足他们各自的电流和电压要求.图4A显示了发射机输出电压下在3.0V时增加负载电流.图4B显示了一个典型的使用MAX3241连接鼠标.表1. MAX3222 / MAX3237 / MAX3241关闭并启用控制真值表表2.所需的小电容值 5V / DIV V CC = 3.3V C1-C4 = 0.1 μF 2V / DIV T2 50微秒/分 T1图3.退出关机或关机时的变送器输出开机 V CC （V） C1 （μF） 4.5至5.5 0.047 3.0至5.5 0.1 C2，C3，C4 （μF） MAX3222 / MAX3232 / MAX3241 0.33 0.47 1 活性 0 1活性 1小号 SH HD DN ?高-Z 1 0高-Z 0 0 T_OUT ? EN MAX3232典型的操作特性（除非另有说明，否则 V CC = + 3.3V，数据速率为235KBPS，电容为0.1μF，所有发射器负载3KΩ，T A = + 25°C）. -6 -5 -4 -3 -2 -1 0 1 2 3 4五 6 0 MAX3222 / MAX3232发射机输出电压与负载电容负载电容（PF） 2000 3000 1000 4000 5000 V OUT + V OUT - 0 2 4 6 8 10 12 14 16 18 20 22 150 MAX3222 / MAX3232 SLEW RATE与负载电容负载电容（PF） 2000 3000 1000 4000 5000数据速率高达235KBPS + SLEW -SLEW 0五 10 15 20 25三十 35 40 0 MAX3222 / MAX3232电源电流与负载电容传输数据时负载电容（PF） 2000 3000 1000 4000 5000 235KBPS 120KBPS 20KBPS的 R L =3KΩ，C L = 1000PF，一个发射器切换， MBAUD = GND普通手术条件普通手术 NS 200 接收器输出禁用时间 | T PHL - T PLH | ，MBAUD = GND NS 100 0.15 250微秒 0.15接收机传播延迟 NS 200接收器输出使能时间单位 MIN TYP MAX参数时序特性-MAX3237 （V CC = + 3.0V至+ 5.5V，C1-C4 =0.1μF（注2），T A = T MIN 至T MAX ，除非另有说明，典型值为T A = + 25°C.） V CC = 3.0V至4.5V，R L =3KΩ，C L = 250PF，一个发射机切换，MBAUD = V CC 1000 V CC = 4.5V至5 MAX3232详细说明:双电荷泵电压转换器 MAX3222 / MAX3232 / MAX3237 / MAX3241内部电源由一个调节双电荷泵组成提供+ 5.5V的输出电压（倍增电荷泵）和-5.5V（反相电荷泵），无论如何 3.0V至5.5V范围内的输入电压（V CC ）. 该电荷泵工作在不连续模式;如果输出电压小于5.5V，电荷泵启用，如果输出电压超过5.5V，则电荷泵被禁用.每个电荷泵需要一个飞行电容器（C1，C2）和一个储存器电容器（C3，C4）以产生V +和V-电源. RS-232变送器发射机是反相电平转换器， vert CMOS逻辑电平为5.0V EIA / TIA-232级别. MAX3222 / MAX3232 / MAX3241发射机guaran-发球时间为120kbps，差情况下为3k Ωin与1000pF并行，提供与PC-to- PC通讯软件（如 LapLink?）.通常，这三个设备可以以数据速率运行的235kbps.变送器可并联，接收者或小鼠. MAX3222 / MAX3237 / MAX3241的输出级为当设备关闭时，关闭（高阻抗）下模式.当电源关闭时，MAX3222 / MAX3232 / MAX3237 / MAX3241允许输出为驱动高达±12V.发射机输入没有上拉电阻. 将未使用的输入连接到GND或V CC . MAX3237 MegaBaud操作在正常工作模式（MBAUD = GND）下， MAX3237发送器保证250kbps的数据速率差情况下为3k Ω与1000pF并联.这提供了与PC到PC通信的兼容性， Laplink?软件.对于高速串行

MAX232中文资料.pdf

________________________________MAX220–MAX249 / ǈ EIA/TIA-232E V.28/V.24 ǈ ±12V ăӼ ǈ 5μW ăMAX225ĂMAX233ĂMAX235 MAX245/MAX246/MAX247ԥ ԩ ǈ ғ ă________________________________ӯRS-232 RS-232_______________________♦ Ă ESD үMAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E ǖ+3.0V +5.5V Ă Ă 1Mbps Ă 0.1μFRS-232 (MAX3246E UCSP TM )♦ ӊMAX221E ǖ±15kV ESD ү Ă+5V Ă1μA ĂAutoShutdown TM RS-232MAX220–MAX249+5V Ă RS-232/_____________________________________________________________________ ӹ19-4323; Rev 15; 1/06_____________________________ࢾ৪ቧᇦ)ኚ*Ᏼၫ௣ᓾ೯ࡼᔢઁ৊߲ă*ൡຢਖৃǈ༿Ꭷ৔ޣೊᇹăAutoShutdown UCSP Maxim Integrated Products, Inc. Ӷă۾ᆪဵNbyjnᑵါ፞ᆪᓾ೯ࡼፉᆪǈNbyjnݙ࣪डፉᒦࡀᏴࡼތፊ૞ᎅࠥޘညࡼࡇᇙঌᐊă༿ᓖፀፉᆪᒦభถࡀᏴᆪᔊᔝᒅ૞डፉࡇᇙǈྙኊཀྵཱྀྀੜࠤᎫࡼᓰཀྵቶǈ༿ݬఠNbyjnᄋ৙ࡼ፞ᆪۈᓾ೯ăჃན඾ॅዹອਜ਼ᔢቤۈࡼၫ௣ᓾ೯ǈ༿षᆰNbyjnࡼᓍ጑ǖxxx/nbyjn.jd/dpn/doăM A X 220–M A X 249+5V Ă RS-232 / 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243(V CC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, T A = T MIN to T MAX ‚ unless otherwise noted.)Note 1:For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.Note 2:Input voltage measured with T OUT in high-impedance state, SHDN or V CC = 0V.Note 3:Maximum reflow temperature for the MAX233A is +225°C.Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (V CC )...............................................-0.3V to +6V V+ (Note 1)..................................................(V CC - 0.3V) to +14V V- (Note 1).............................................................+0.3V to +14V Input VoltagesT IN ..............................................................-0.3V to (V CC - 0.3V)R IN (Except MAX220)........................................................±30V R IN (MAX220).....................................................................±25V T OUT (Except MAX220) (Note 2).......................................±15V T OUT (MAX220)...............................................................±13.2V Output VoltagesT OUT ...................................................................................±15V R OUT .........................................................-0.3V to (V CC + 0.3V)Driver/Receiver Output Short Circuited to GND.........Continuous Continuous Power Dissipation (T A = +70°C)16-Pin Plastic DIP (derate 10.53mW/°C above +70°C).842mW18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin Plastic DIP (derate 8.00mW/°C above +70°C)..440mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)...696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW 18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW Operating Temperature RangesMAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C MAX2_ _AE_ _, MAX2_ _E_ _..........................-40°C to +85°C MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s) (Note 3)...................+300°CMAX220–MAX249+5V Ă RS-232/_______________________________________________________________________________________3OUT IN ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)(V CC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, T A = T MIN to T MAX ‚ unless otherwise noted.)M A X 220–M A X 249+5V Ă RS-232 / 4_______________________________________________________________________________________________________________________________________________________MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243108-1051525OUTPUT VOLTAGE vs. LOAD CURRENT-4-6-8-2642LOAD CURRENT (mA)O U T P U T V O L T A G E (V )1002011104104060AVAILABLE OUTPUT CURRENTvs. DATA RATE65798DATA RATE (kb/s)O U T P U T C U R R E N T (m A )203050+10V-10VMAX222/MAX242ON-TIME EXITING SHUTDOWN+5V +5V 0V0V 500μs/div V +, V - V O L T A G E (V )ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)(V CC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, T A = T MIN to T MAX ‚ unless otherwise noted.)MAX220–MAX249+5V Ă RS-232/_______________________________________________________________________________________5V CC ...........................................................................-0.3V to +6V V+................................................................(V CC - 0.3V) to +14V V-............................................................................+0.3V to -14V Input VoltagesT IN ............................................................-0.3V to (V CC + 0.3V)R IN ......................................................................................±30V Output VoltagesT OUT ...................................................(V+ + 0.3V) to (V- - 0.3V)R OUT .........................................................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T OUT ......................................Continuous Continuous Power Dissipation (T A = +70°C)14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW 24-Pin Narrow Plastic DIP(derate 13.33mW/°C above +70°C)..........1.07W24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW20-Pin Wide SO (derate 10.00mW/°C above +70°C).......800mW 24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W 44-Pin Plastic FP (derate 11.11mW/°C above +70°C).....889mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C)..........727mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C)........800mW 20-Pin CERDIP (derate 11.11mW/°C above +70°C)........889mW 24-Pin Narrow CERDIP(derate 12.50mW/°C above +70°C)..............1W24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W 28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW Operating Temperature RangesMAX2 _ _ C _ _......................................................0°C to +70°C MAX2 _ _ E _ _...................................................-40°C to +85°C MAX2 _ _ M _ _................................................-55°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s) (Note 4)...................+300°CABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10%; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0μF; MAX231/MAX239,V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX ; unless otherwise noted.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 4:Maximum reflow temperature for the MAX233/MAX235 is +225°C.M A X 220–M A X 249+5V Ă RS-232 / 6_______________________________________________________________________________________ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241 (continued)(MAX223/230/232/234/236/237/238/240/241, V CC = +5V ±10%; MAX233/MAX235, V CC = 5V ±5%‚ C1–C4 = 1.0μF; MAX231/MAX239,V CC = 5V ±10%; V+ = 7.5V to 13.2V; T A = T MIN to T MAX ; unless otherwise noted.)MAX220–MAX249+5V Ă RS-232/_______________________________________________________________________________________7_______________________________________________________________MAX223/MAX230–MAX2418.56.54.55.5TRANSMITTER OUTPUT VOLTAGE (V OH ) vs. V CC7.08.0V CC (V)V O H (V )5.07.57.46.02500TRANSMITTER OUTPUT VOLTAGE (V OH )vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES6.46.27.27.0LOAD CAPACITANCE (pF)V O H (V )1500100050020006.86.612.04.02500TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE6.05.011.09.010.0LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )1500100050020008.07.0-6.0-9.04.55.5TRANSMITTER OUTPUT VOLTAGE (V OL ) vs. V CC-8.0-8.5-6.5-7.0V CC (V)V O L (V )5.0-7.5-6.0-7.62500TRANSMITTER OUTPUT VOLTAGE (V OL )vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES-7.0-7.2-7.4-6.2-6.4LOAD CAPACITANCE (pF)V O L (V )150010005002000-6.6-6.810-105101520253035404550TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CURRENT-2-6-4-886CURRENT (mA)V +, V - (V )420*SHUTDOWN POLARITY IS REVERSED FOR NON MAX241 PARTSV+, V- WHEN EXITING SHUTDOWN(1μF CAPACITORS)MAX220-13SHDN*V-O V+500ms/divM A X 220–M A X 249+5V Ă RS-232 / 8_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1μF; T A = T MIN to T MAX ; unless oth-erwise noted.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Supply Voltage (V CC )...............................................-0.3V to +6V Input VoltagesT IN ‚ ENA , ENB , ENR , ENT , ENRA ,ENRB , ENTA , ENTB ..................................-0.3V to (V CC + 0.3V)R IN .....................................................................................±25V T OUT (Note 5).....................................................................±15V R OUT ........................................................-0.3V to (V CC + 0.3V)Short Circuit (one output at a time)T OUT to GND............................................................Continuous R OUT to GND............................................................ContinuousContinuous Power Dissipation (T A = +70°C)28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 40-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...611mW 44-Pin PLCC (derate 13.33mW/°C above +70°C)...........1.07W Operating Temperature RangesMAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering,10s) (Note 6)....................+300°CNote 5:Input voltage measured with transmitter output in a high-impedance state, shutdown, or V CC = 0V.Note 6:Maximum reflow temperature for the MAX225/MAX245/MAX246/MAX247 is +225°C.MAX220–MAX249+5V Ă RS-232/_______________________________________________________________________________________9Note 7:The 300Ωminimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or V CC =0V is 10M Ωas is implied by the leakage specification.ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)(MAX225, V CC = 5.0V ±5%; MAX244–MAX249, V CC = +5.0V ±10%, external capacitors C1–C4 = 1μF; T A = T MIN to T MAX ; unless oth-erwise noted.)M A X 220–M A X 249+5V Ă RS-232 / 10_____________________________________________________________________________________________________________________________________________________MAX225/MAX244–MAX24918212345TRANSMITTER SLEW RATE vs. LOAD CAPACITANCE86416LOAD CAPACITANCE (nF)T R A N S M I T T E R S L E W R A T E (V /μs )14121010-105101520253035OUTPUT VOLTAGEvs. LOAD CURRENT FOR V+ AND V--2-4-6-88LOAD CURRENT (mA)O U T P U T V O L T A G E (V )64209.05.012345TRANSMITTER OUTPUT VOLTAGE (V+, V-)vs. LOAD CAPACITANCE AT DIFFERENT DATA RATES6.05.58.5LOAD CAPACITANCE (nF)V +, V (V )8.07.57.06.5MAX220–MAX249+5V RS-232/1. 2.3. 4.M A X 220–M A X 249+5V RS-232 / ENT ENR OPERATION STATUS TRANSMITTERSRECEIVERS00Normal Operation All Active All Active 01Normal Operation All Active All 3-State10Shutdown All 3-State All Low-Power Receive Mode 11ShutdownAll 3-StateAll 3-Stateӹ1a. MAX245ENT ENR OPERATION STATUS TRANSMITTERS RECEIVERSTA1–TA4TB1–TB4RA1–RA5RB1–RB500Normal Operation All Active All Active All Active All Active 01Normal Operation All Active All Active RA1–RA4 3-State,RA5 Active RB1–RB4 3-State,RB5 Active 1ShutdownAll 3-StateAll 3-StateAll Low-Power Receive Mode All Low-Power Receive Mode 11Shutdown All 3-State All 3-StateRA1–RA4 3-State,RA5 Low-Power Receive ModeRB1–RB4 3-State,RB5 Low-Power Receive Modeӹ1b. MAX245ӹ1c. MAX246ENA ENB OPERATION STATUS TRANSMITTERS RECEIVERSTA1–TA4TB1–TB4RA1–RA5RB1–RB500Normal Operation All Active All Active All Active All Active 01Normal Operation All Active All 3-State All Active RB1–RB4 3-State,RB5 Active 1ShutdownAll 3-StateAll ActiveRA1–RA4 3-State,RA5 Active All Active 11Shutdown All 3-State All 3-StateRA1–RA4 3-State,RA5 Low-Power Receive ModeRB1–RB4 3-State,RA5 Low-Power Receive ModeMAX220–MAX249+5V RS-232/M A X 220–M A X 249____________________________MAX220–MAX249Ҫ 4 ԩ ǖ ӏDC-DC ĂRS-232 ĂRS-232 ǈ ăӏMAX220–MAX249 ԩ ӏǈ +5V ±10V ( )ǈ RS-232 ă C1 +5V ӂǈ V+ C3 +10V Ǘ C2 +10V V- C4 -10V ă+10V (V+) -10V (V-) ǈ ԩ (Ը ԩ )Ǘ MAX225 MAX245–MAX247 ǈ ԥ ăV+ V- ǈ ă V+ĂV- ԩ ǈ ԥ V+ĂV- EIA/TIA-232E ±5V ăMAX222ĂMAX225ĂMAX230ĂMAX235ĂMAX236ĂMAX240ĂMAX241 MAX245–MAX249 ǈ Ө V+ V- ԩ ă ǈV- 0V ǈV+ +5V ă +10V ԩ V+ ( ԥ ԩ ӏ դ +10V) ǈ ԥ Ѡ C1ǈԌ Ӥ SHDN V CC ǈ V+Ӈ ԩ V CC ăRS-232Ӷ 5kΩ RS-232 ǈԌ V CC =+5V ǈ ҈ ±8V ă ҈ ү EIA/TIA-232E V.28 ǈ ±5V ǈ Ҫ 3kΩ ĂV CC = +4.5V ă (V +-1.3V) (V- +0.5V)ăTTL CMOS ă ԥ ǈ Ă V CC 400kΩ (MAX220 )ă ǈ ă Ӈ ǈ ԩ ի 12μA ă Ă Ӈǈ ӡǈԌ ǈ ի Ѡ( 25μA)ă Ӈ ±15V ă ǈ ի 8μA ăMAX220ԥ ӄ ԩ ǈ ԥ ǈ GND V CC ăMAX239 ǈ MAX223ĂMAX225ĂMAX235ĂMAX236ĂMAX240 MAX241 ӄ ăӹ2 ă( MAX225/MAX235/MAX236/MAX239–MAX241)ǈ TTL/CMOS Ă Ǘ ǈ ǈ ăǈ Ӈ ӡǈ 1μA ǈ Ӈ ă 1μA ǈ ӯ Ӈ 0V (V CC +6V)ă -0.5V ǈ ǈ 1kΩ ă Ӈ V CC +6V ǈ 1kΩ ă҈ 30V/μs ǈ EIA/TIA-232E V.28 ă҈ ǖ 24V/μs ǈ3Ω 2500pF 10V/μs ăRS-232EIA/TIA-232E V.28 3V 0ǈ ǈ ă 0.8V 2.4V ǈ TTL ǈ EIA/TIA-232E V.28 ă±25V ǈԌ Ӷ 5kΩ ă V.28 EIA/TIA-232E ă+5V RS-232 /ӹMAX220–MAX249+5V RS-232/0.5V ǈԌ ү0.2V ă ǈ Ӱ դ Ӱǈ ă 600ns ǈ ҈ ăMAX223ĂMAX242 MAX245–MAX249 ǈ IC ǈ ă ի ă ǈ ǈ ӄ Ă ă Ճ ă—MAX243MAX243 MAX232A ǈ Ӽ RS-232 ү ă CTS RTS Ӈ ǈ ԥ ăԥӤ ԥ ԥ ӄăү -0.8V ǈ ԥ +1.4V ă ǈ ԯӰ ă ǈ 0ǈ Đ đ ă իǈMAX243 (+1.4V ) (TD RD)ǈ (DTR ĂDTS ĂCTS ĂRTS ) ăRS-232 դ Ѣ EIA/TIA-232E ǈԳ ү ă Ӈ Ă ǈ Ӱ ă IC ă Ө ǈ Ӥ Ӈ ǈ ă—MAX222–MAX242ǈMAX222ĂMAX235ĂMAX236ĂMAX240 MAX241 Ӈ ă ǈMAX223 MAX242 ү ă ǈ Ӱǈ 2.5μs ă ǈ CMOS ăMAX223 MAX242 ( MAX242 EN ĂMAX223 EN)ǈ SHDN ( MAX241 SHDN) ă SHDN ( MAX241 SHDN ) ăMAX225 5 5 ǗMAX245 10 8 ă ă ENT ǈ ӏ ӡԌ ă ǈ 25μA ǈ ү ǈ ( )ăMAX225 5 ENR ăMAX245 8 ENR ǈ (RA5 RB5) ү ă ENR ǈRA1–RA4 RB1–RB4 ăMAX225 MAX245–MAX249 ăǖ ( ի )Ă ( ) ( ү )ă ă ǖ ( ի ) ( )ă Ӈ ă Ӈ ǈ ă ǈ ăM A X 220–M A X 249ӹ1a–1d ăMAX244 ǈ Ҫ ӹ ăMAX246 10 8 ǈ ǈ Ӽ ՊăA Պ (ENA ) ǈ 4 A Պ Ǘ ǈB Պ (ENB ) 4 B Պ ă MAX245 ǈ A Պ B Պ (RA5 RB5) ү ă A ՊĂB Պ Ӈ (ENA =ENB =+5V) ǈ ăMAX247 9 8 ǈ 4 ăENRA ĂENRB ǈ Ӽ 4 ăENTA ĂENTB ǈ Ӽ 4 ă 9 (RB5) ă ENTA ENTB ăMAX248 8 8 ǈ 4 ăENRA ĂENRB ǈ Ӽ 4ăENTA ĂENTB ǈ Ӽ 4 ă ă ENTA ĂENTB ǈ ăMAX249 10 6 ǈ 4 ăENRA ĂENRB ǈ Ӽ 5 ăENTA ĂENTB ǈ Ӽ 3 ă ă ENTA ĂENTB ǈ ă ǈү ǈ 20kb/s ă____________________________5 25 ă ǈV CC C1ĂC2 ǈ ҈ ă+5V RS-232 /MAX220–MAX249+5V RS-232/5. MAX220/MAX232/MAX232A6. MAX222/MAX242M A X 220–M A X 249+5V RS-232 /7. MAX225MAX220–MAX249+5V RS-232/8. MAX223/MAX241M A X 220–M A X 249+5V RS-232 /9. MAX23010. MAX231MAX220–MAX249+5V RS-232/12. MAX23411. MAX233/MAX233AM A X 220–M A X 249+5V RS-232 /13. MAX235MAX220–MAX249+5V RS-232/14. MAX236M A X 220–M A X 249+5V RS-232 /15. MAX237MAX220–MAX249+5V RS-232/16. MAX238M A X 220–M A X 249+5V RS-232 /17. MAX239MAX220–MAX249+5V RS-232/18. MAX240M A X 220–M A X 249+5V RS-232 /19. MAX243MAX220–MAX249+5V RS-232/20. MAX244M A X 220–M A X 249+5V RS-232 /21. MAX245MAX220–MAX249+5V RS-232/______________________________________________________________________________________3122. MAX246M A X 220–M A X 249+5V RS-232 / 32______________________________________________________________________________________23. MAX247MAX220–MAX249+5V RS-232/______________________________________________________________________________________3324. MAX248M A X 220–M A X 249+5V RS-232 / 34______________________________________________________________________________________25. MAX249MAX220–MAX249+5V RS-232/______________________________________________________________________________________35_____________________________________________________________________ ( )*ൡຢਖৃǈ༿Ꭷ৔ޣೊᇹăM A X 220–M A X 249+5V RS-232 / _____________________________________________________________________ ( )*ൡຢਖৃǈ༿Ꭷ৔ޣೊᇹă____________________________ǈ Փ /packages ă_____________________________Rev 15 ǖ2–5Ă8Ă9Ă36ăNbyjnݙ࣪Nbyjnޘອጲᅪࡼྀੜ࢟വဧ፿ঌᐊǈጐݙᄋ৙໚ᓜಽ኏భăNbyjnۣഔᏴྀੜဟମĂ඗ᎌྀੜᄰۨࡼ༄ᄋሆኀখޘອᓾ೯ਜ਼ਖৃࡼཚಽă36____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2006 Maxim Integrated ProductsNbyjn ဵNbyjn!Joufhsbufe!Qspevdut-!Jod/ࡼᓖݿ࿜ܪăNbyjn ۱யێူࠀ۱ய9439ቧረᎆᑶܠ൩211194඾ॅ࢟જǖ911!921!1421࢟જǖ121.732262::ࠅᑞǖ121.732263::。

MEMORY存储芯片MAX3232ESE中文规格书

__________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000MAX3222/MAX3232/MAX3237/MAX32413.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1µF External CapacitorsFigure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per Transmitter3.0V to 5.5V , Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External CapacitorsMAX3222/MAX3232/MAX3237/MAX3241CC = 3.3V5μs/divFigure 5. Loopback Test CircuitHigh Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopb ack test circuit. Figure 6 shows a loopb ack test result at 120kbps, and Figure 7 shows the same test at 235kbps. For Figure 6, all transmitters were driven simultaneously at 120kb ps into RS-232 loads in parallel with 1000pF. For Figure 7, a single transmitter was driven at 235kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mb ps. Figure 8 shows a loopb ack test result at 1Mb ps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.fdzfdfbbFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2μs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )___________________Chip Topography___________________Chip InformationT1INT2IN 0.087"(2.209mm)R2OUTR2IN T2OUT R1OUTR1INT1OUTV CCV+C1+ENC1-C2+C2-V-GNDTRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDMAX3222/MAX3232/MAX3237/MAX3241 3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232Transceivers Using Four 0.1µF External Capacitors。

MAX3221-MAX3243芯片手册

_____________________Selector Guide
PART MAX3221 MAX3223 MAX3243 Tx 1 2 3 Rx 1 2 5 VCC RANGE (V) AutoShutdown 3.0 to 5.5 3.0 to 5.5 3.0 to 5.5 Yes Yes Yes
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-0.3V to +6V V+ (Note 1) ...............................................................-0.3V to +7V V- (Note 1) ...............................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, FORCEOFF, FORCEON, EN (MAX3223) ......-0.3V to +6V R_IN ...................................................................................±25V Output Voltages T_OUT.............................................................................±13.2V R_OUT, INVALID ......................................-0.3V to (VCC + 0.3V) Short-Circuit Duration T_OUT ......................................................................Continuous Continuous Power Dissipation (TA = +70°C) 16-Pin SSOP (derate 7.14mW/°C above +70°C) ...........571mW 16-Pin TSSOP (derate 6.70mW/°C above +70°C) .........533mW 20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW 20-Pin SSOP (derate 8.00mW/°C above +70°C) ...........640mW 20-Pin TSSOP DIP (derate 7.00mW/°C above +70°C).....559mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C) ............1W 28-Pin SSOP (derate 9.52mW/°C above +70°C) ...........762mW 28-Pin TSSOP (derate 8.70mW/°C above +70°C) .........696mW Operating Temperature Ranges MAX32_ _C_ _.......................................................0°C to +70°C MAX32_ _E_ _ ....................................................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C

MAX3232CUE+中文资料

________________General DescriptionThe MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out-put stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232output levels.The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standard MAX242 and MAX232, respectively.The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current. Receivers R1(MAX3237/MAX3241) and R2 (MAX3241) have extra out-puts in addition to their standard outputs. These extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have V CC completely removed.The MAX3222, MAX3237, and MAX3241 are available in space-saving TSSOP and SSOP packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Smaller Packaging:MAX3228E/MAX3229E: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222/MAX3232/MAX3237/MAX3241*3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.Typical Operating Circuits appear at end of data sheet.Ordering Information continued at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors6_____________________________________________________________________________________________________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________7_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = G ND), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as Laplink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors8_______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors10______________________________________________________________________________________Figure 4b. Mouse Driver Test Circuit Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________11High Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.CC = 3.3V5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________13_____________________________________Typical Operating Circuits (continued)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors14___________________________________________________________________________________________________________________________________Pin Configurations (continued)MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________15______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors16_________________________________________________________________________________________________________Chip Topography___________________Chip InformationT1INT2IN 0.127"(3.225mm)0.087"(2.209mm)R2OUTR2IN T2OUTV CCV+C1+SHDNENC1- C2+C2-V-MAX3222TRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDTransceivers Using Four 0.1µF External CapacitorsPackage Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to /packages.)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.17__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.。

MAX3232EPE+中文资料

________________General DescriptionThe MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out-put stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232output levels.The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standard MAX242 and MAX232, respectively.The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current. Receivers R1(MAX3237/MAX3241) and R2 (MAX3241) have extra out-puts in addition to their standard outputs. These extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have V CC completely removed.The MAX3222, MAX3237, and MAX3241 are available in space-saving TSSOP and SSOP packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Smaller Packaging:MAX3228E/MAX3229E: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222/MAX3232/MAX3237/MAX3241*3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.Typical Operating Circuits appear at end of data sheet.Ordering Information continued at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors6_____________________________________________________________________________________________________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________7_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = G ND), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as Laplink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors8_______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors10______________________________________________________________________________________Figure 4b. Mouse Driver Test Circuit Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________11High Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.CC = 3.3V5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________13_____________________________________Typical Operating Circuits (continued)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors14___________________________________________________________________________________________________________________________________Pin Configurations (continued)MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________15______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors16_________________________________________________________________________________________________________Chip Topography___________________Chip InformationT1INT2IN 0.127"(3.225mm)0.087"(2.209mm)R2OUTR2IN T2OUTV CCV+C1+SHDNENC1- C2+C2-V-MAX3222TRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDTransceivers Using Four 0.1µF External CapacitorsPackage Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to /packages.)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.17__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.。

MAX3232中文资料

MAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07MegaBaud和UCSP是Maxim Integrated Products, Inc.的商标。

本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。

如需进一步确认，请在您的设计中参考英文资料。

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M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容4________________________________________________________________________________________________________________________________________________________________典型工作特性(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500____________________________________________________________________典型工作特性(续)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容6_________________________________________________________________________________________________________________________________________________________________引脚说明MAX3222/MAX3232/MAX3237/MAX32413.0V至5.5V、低功耗、1Mbps、真RS-232收发器，使用四只0.1µF外部电容_______________________________________________________________________________________7_______________________________详细说明双电荷泵电压转换器MAX3222/MAX3232/MAX3237/MAX3241的内部电源由两路稳压型电荷泵组成，只要输入电压(V CC )在3.0V至5.5V范围以内，即可提供+5.5V (倍压电荷泵)和-5.5V (反相电荷泵)输出电压。

MAX3222CAP中文资料

________________General DescriptionThe MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out-put stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232output levels.The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standard MAX242 and MAX232, respectively.The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current. Receivers R1(MAX3237/MAX3241) and R2 (MAX3241) have extra out-puts in addition to their standard outputs. These extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have V CC completely removed.The MAX3222, MAX3237, and MAX3241 are available in space-saving TSSOP and SSOP packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Smaller Packaging:MAX3228E/MAX3229E: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222/MAX3232/MAX3237/MAX3241*3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.Typical Operating Circuits appear at end of data sheet.Ordering Information continued at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors6_____________________________________________________________________________________________________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________7_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = G ND), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as Laplink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors8_______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors10______________________________________________________________________________________Figure 4b. Mouse Driver Test Circuit Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________11High Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.CC = 3.3V5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________13_____________________________________Typical Operating Circuits (continued)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors14___________________________________________________________________________________________________________________________________Pin Configurations (continued)MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________15______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors16_________________________________________________________________________________________________________Chip Topography___________________Chip InformationT1INT2IN 0.127"(3.225mm)0.087"(2.209mm)R2OUTR2IN T2OUTV CCV+C1+SHDNENC1- C2+C2-V-MAX3222TRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDTransceivers Using Four 0.1µF External CapacitorsPackage Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to /packages.)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.17__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.。

MAX3222ECTP中文资料

♦ For Low-Voltage or Data Cable Applications MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins
MAX3222EEPN -40°C to +85°C 18 Plastic DIP —
MAX3232ECAE 0°C to +70°C 16 SSOP
—
MAX3232ECWE 0°C to +70°C 16 Wide SO —
MAX3232ECPE 0°C to +70°C 16 Plastic DIP —
General Description
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24 communications interface devices feature low power consumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmitter output pins are protected to ±15kV using the Human Body Model.

MAX3232EWE资料

________________General DescriptionThe MAX3222/MAX3232/MAX3237/MAX3241 trans-ceivers have a proprietary low-dropout transmitter out-put stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232output levels.The MAX3222/MAX3232 have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply cur-rent. The MAX3222 and MAX3232 are pin, package,and functionally compatible with the industry-standard MAX242 and MAX232, respectively.The MAX3241 is a complete serial port (3 drivers/5 receivers) designed for notebook and subnotebook computers. The MAX3237 (5 drivers/3 receivers) is ideal for fast modem applications. Both these devices feature a shutdown mode in which all receivers can remain active while using only 1µA supply current. Receivers R1(MAX3237/MAX3241) and R2 (MAX3241) have extra out-puts in addition to their standard outputs. These extra outputs are always active, allowing external devices such as a modem to be monitored without forward bias-ing the protection diodes in circuitry that may have V CC completely removed.The MAX3222, MAX3237, and MAX3241 are available in space-saving TSSOP and SSOP packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers High-Speed Modems Battery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Smaller Packaging:MAX3228E/MAX3229E: +2.5V to +5.5V RS-232Transceivers in UCSP™♦For Integrated ESD Protection:MAX3222E/MAX3232E/MAX3237E/MAX3241E*/MAX3246E: ±15kV ESD-Protected, Down to 10nA,3.0V to 5.5V, Up to 1Mbps, True RS-232Transceivers♦For Low-Voltage or Data Cable Applications:MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2 Tx/2 Rx RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222/MAX3232/MAX3237/MAX3241*3.0V to 5.5V , Low-Power , up to 1Mbps, T rue RS-232Transceivers Using Four 0.1µF External Capacitors________________________________________________________________Maxim Integrated Products119-0273; Rev 7; 1/07*Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.Typical Operating Circuits appear at end of data sheet.Ordering Information continued at end of data sheet.For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.Note 1:V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.V CC ...........................................................................-0.3V to +6V V+ (Note 1)...............................................................-0.3V to +7V V- (Note 1)................................................................+0.3V to -7V V+ + V- (Note 1)...................................................................+13V Input VoltagesT_IN, SHDN , EN ...................................................-0.3V to +6V MBAUD...................................................-0.3V to (V CC + 0.3V)R_IN.................................................................................±25V Output VoltagesT_OUT...........................................................................±13.2V R_OUT....................................................-0.3V to (V CC + 0.3V)Short-Circuit DurationT_OUT....................................................................ContinuousContinuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 6.7mW/°C above +70°C).............533mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C)....696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)........762mW 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)...842mW 18-Pin SO (derate 9.52mW/°C above +70°C)..............762mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin SSOP (derate 7.00mW/°C above +70°C).........559mW 20-Pin TSSOP (derate 8.0mW/°C above +70°C).............640mW 28-Pin TSSOP (derate 8.7mW/°C above +70°C).............696mW 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin SO (derate 12.50mW/°C above +70°C).....................1W Operating Temperature RangesMAX32_ _C_ _.....................................................0°C to +70°C MAX32_ _E_ _ .................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________3TIMING CHARACTERISTICS—MAX3222/MAX3232/MAX3241(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors4_________________________________________________________________________________________________________________________________Typical Operating Characteristics(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)-6-5-4-3-2-101234560MAX3222/MAX3232TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )20003000100040005000246810121416182022150MAX3222/MAX3232SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303540MAX3222/MAX3232SUPPLY CURRENT vs. LOAD CAPACITANCEWHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000TIMING CHARACTERISTICS—MAX3237(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF (Note 2), T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)Note 2:MAX3222/MAX3232/MAX3241: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.MAX3237: C1–C4 = 0.1µF tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V ±10%.Note 3:Transmitter input hysteresis is typically 250mV.MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________5-7.5-5.0-2.502.55.07.50MAX3241TRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )2000300010004000500046810121416182022240MAX3241SLEW RATEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /µs )20003000100040005000510152025303545400MAX3241SUPPLY CURRENT vs. LOADCAPACITANCE WHEN TRANSMITTING DATALOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20003000100040005000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )200030001000400050000102030504060700MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )500100015002000-7.5-5.0-2.502.55.07.50MAX3237TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )5001000150020001020304050600MAX3237SUPPLY CURRENT vs.LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )200030001000400050000246810120MAX3237SLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /µs )2000300010004000500010302040506070MAX3237SKEW vs. LOAD CAPACITANCE(t PLH - t PHL )LOAD CAPACITANCE (pF)1000150050020002500_____________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 235kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω, T A = +25°C, unless otherwise noted.)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors6_____________________________________________________________________________________________________________________________________________________Pin DescriptionMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________7_______________Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222/MAX3232/MAX3237/MAX3241’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump), regardless of the input voltage (V CC ) over the 3.0V to 5.5V range. The charge pumps operate in a discontinuous mode; if the output voltages are less than 5.5V, the charge pumps are enabled, and if the output voltages exceed 5.5V, the charge pumps are disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies.RS-232 TransmittersThe transmitters are inverting level translators that con-vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3222/MAX3232/MAX3241 transmitters guaran-tee a 120kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™).Typically, these three devices can operate at data rates of 235kbps. Transmitters can be paralleled to drive multi-ple receivers or mice.The MAX3222/MAX3237/MAX3241’s output stage is turned off (high impedance) when the device is in shut-down mode. When the power is off, the MAX3222/MAX3232/MAX3237/MAX3241 permit the outputs to be driven up to ±12V.The transmitter inputs do not have pullup resistors.Connect unused inputs to GND or V CC .MAX3237 MegaBaud OperationIn normal operating mode (MBAUD = G ND), the MAX3237 transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF.This provides compatibility with PC-to-PC communica-tion software, such as Laplink.For higher speed serial communications, the MAX3237features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237 transmitters guar-antee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for 3.0V < V CC < 4.5V. For 5V ±10%operation, the MAX3237 transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software, Inc.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors8_______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic out-put levels. The MAX3222/MAX3237/MAX3241 receivers have inverting three-state outputs. In shutdown, the receivers can be active or inactive (Table 1).The complementary outputs on the MAX3237 (R1OUTB)and the MAX3241 (R1OUTB, R2OUTB) are always active,regardless of the state of EN or SHDN . This allows for Ring Indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC is set to 0V in shutdown to accommodate peripherals, such as UARTs (Figure 2).MAX3222/MAX3237/MAX3241Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). When shut down, the device’s charge pumps are turned off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter outputs are dis-abled (high impedance). The time required to exit shut-down is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if the shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB.MAX3222/MAX3237/MAX3241Enable ControlThe inverting receiver outputs (R_OUT) are put into a high-impedance state when EN is high. The complemen-tary outputs R1OUTB and R2OUTB are always active,regardless of the state of EN and SHDN (Table 1). EN has no effect on T_OUT.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, refer to Table 2 for required capacitor values. Do not use values lower than those listed in Table 2. Increasing the capaci-tor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consump-tion. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1 without also increasing the values of C2, C3, and C4, to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degrade exces-sively with temperature. If in doubt, use capacitors with a higher nominal value. The capacitor’s equivalent series resistance (ESR), which usually rises at low tempera-tures, influences the amount of ripple on V+ and V-.Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237/MAX3241(b) with Previous Transceivers (a).MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors_______________________________________________________________________________________9Power-Supply DecouplingIn most circumstances, a 0.1µF bypass capacitor is adequate. In applications that are sensitive to power-supply noise, decouple V CC to ground with a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Transmitter Outputs whenExiting ShutdownFigure 3 shows two transmitter outputs when exiting shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 lev-els (one transmitter input is high, the other is low).Each transmitter is loaded with 3k Ωin parallel with 2500pF. The transmitter outputs display no ringing or undesirable transients as they come out of shutdown.Note that the transmitters are enabled only when the magnitude of V- exceeds approximately 3V.Mouse DriveabilityThe MAX3241 has been specifically designed to power serial mice while operating from low-voltage power sup-plies. It has been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3241 successfully drove all serial mice tested and met their respective current and voltage requirements.Figure 4a shows the transmitter output voltages under increasing load current at 3.0V. Figure 4b shows a typical mouse connection using the MAX3241.CC = 3.3V C1–C4 = 0.1µF50µs/divFigure 3. Transmitter Outputs when Exiting Shutdown or Powering UpM A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors10______________________________________________________________________________________Figure 4b. Mouse Driver Test Circuit Figure 4a. MAX3241 Transmitter Output Voltage vs. Load Current per TransmitterMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________11High Data RatesThe MAX3222/MAX3232/MAX3241 maintain the RS-232±5.0V minimum transmitter output voltage even at high data rates. Figure 5 shows a transmitter loopback test circuit. Figure 6 shows a loopback test result at 120kbps, and Figure 7 shows the same test at 235kbps.For Figure 6, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF.For Figure 7, a single transmitter was driven at 235kbps,and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237 maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 8 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 8, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.CC = 3.3V5µs/divFigure 5. Loopback Test CircuitFigure 6. MAX3241 Loopback Test Result at 120kbpsCC = 3.3V2µs/divFigure 7. MAX3241 Loopback Test Result at 235kbps0V +5V 0V -5V +5V 0VT_INT_OUT = R_IN 5k R_OUT 150pF200ns/divCC = 3.3VFigure 8. MAX3237 Loopback Test Result at 1000kbps (MBAUD = V CC )M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors__________________________________________________Typical Operating CircuitsInterconnection with 3V and 5V LogicThe MAX3222/MAX3232/MAX3237/MAX3241 can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 3 for more informa-tion on possible combinations of interconnections.Table 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________13_____________________________________Typical Operating Circuits (continued)M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors14___________________________________________________________________________________________________________________________________Pin Configurations (continued)MAX3222/MAX3232/MAX3237/MAX3241Transceivers Using Four 0.1µF External Capacitors______________________________________________________________________________________15______3V-Powered EIA/TIA-232 and EIA/TIA-562 Transceivers from MaximOrdering Information (continued)*Dice are tested at T A = +25°C, DC parameters only.+Denotes lead-free package.M A X 3222/M A X 3232/M A X 3237/M A X 3241Transceivers Using Four 0.1µF External Capacitors16_________________________________________________________________________________________________________Chip Topography___________________Chip InformationT1INT2IN 0.127"(3.225mm)0.087"(2.209mm)R2OUTR2IN T2OUTV CCV+C1+SHDNENC1- C2+C2-V-MAX3222TRANSISTOR COUNT: 339SUBSTRATE CONNECTED TO GNDTransceivers Using Four 0.1µF External CapacitorsPackage Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to /packages.)Revision HistoryPages changed at Rev 7: 1, 15, 16, 17Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.17__________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600©2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.。

MAX3232EEUE+T中文资料

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim's website at .General DescriptionThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24communications interface devices feature low power con-sumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-G ap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmit-ter output pins are protected to ±15kV using the Human Body Model.A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for opera-tion from a +3.3V supply. Each device guarantees opera-tion at data rates of 250kbps while maintaining RS-232output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232-compliant output levels.The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-pow-ered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and func-tionally compatible with the industry-standard MAX242and MAX232, respectively.The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shut-down mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).The MAX3222E, MAX3232E, and MAX3241E are avail-able in space-saving SO, SSOP, TQFN and TSSOP pack-ages. The MAX3237E is offered in an SSOP package.The MAX3246E is offered in the ultra-small 6 x 6 UCSP™package.ApplicationsBattery-Powered Equipment PrintersCell PhonesSmart Phones Cell-Phone Data Cables xDSL ModemsNotebook, Subnotebook,and Palmtop ComputersNext-Generation Device Features♦For Space-Constrained ApplicationsMAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP ♦For Low-Voltage or Data Cable ApplicationsMAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic PinsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246E±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V ,Up to 1Mbps, True RS-232 Transceivers________________________________________________________________Maxim Integrated Products 119-1298; Rev 11; 10/07Ordering Information continued at end of data sheet.*Dice are tested at T A = +25°C, DC parameters only.**EP = Exposed paddle.Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet.MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.†Covered by U.S. Patent numbers 4,636,930; 4,679,134;4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Notes 3, 4)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.V CC to GND..............................................................-0.3V to +6V V+ to GND (Note 1)..................................................-0.3V to +7V V- to GND (Note 1)...................................................+0.3V to -7V V+ + |V-| (Note 1).................................................................+13V Input Voltages T_IN, EN , SHDN , MBAUD to GND ........................-0.3V to +6V R_IN to GND.....................................................................±25V Output Voltages T_OUT to GND...............................................................±13.2V R_OUT, R_OUTB (MAX3241E)................-0.3V to (V CC + 0.3V)Short-Circuit Duration, T_OUT to GND.......................Continuous Continuous Power Dissipation (T A = +70°C)16-Pin SSOP (derate 7.14mW/°C above +70°C)..........571mW 16-Pin TSSOP (derate 9.4mW/°C above +70°C).......754.7mW 16-Pin TQFN (derate 20.8mW/°C above +70°C).....1666.7mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW 18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW 20-Pin TQFN (derate 21.3mW/°C above +70°C)........1702mW 20-Pin TSSOP (derate 10.9mW/°C above +70°C)........879mW 20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW 28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW 28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W 28-Pin TSSOP (derate 12.8mW/°C above +70°C)......1026mW 32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW 6 x 6 UCSP (derate 12.6mW/°C above +70°C).............1010mW Operating Temperature Ranges MAX32_ _EC_ _...................................................0°C to +70°C MAX32_ _EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°C Bump Reflow Temperature (Note 2)Infrared, 15s..................................................................+200°C Vapor Phase, 20s..........................................................+215°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.Note 2:This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the devicecan be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom-mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow.Preheating is required. Hand or wave soldering is not allowed.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________3M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3237E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 3)±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at 5.0V ±10%.Note 4:MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range.Note 5:The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are atthe supply rails.Note 6:MAX3241EEUI is specified at T A = +25°C.Note 7:Transmitter skew is measured at the transmitter zero crosspoints.TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246EMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________5-6-4-202460MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = GND)LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )10001500500200025003000531-1-3-5-6-2-42046-5-31-135010001500500200025003000LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCE-7.5-5.0-2.502.55.07.5MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE (MBAUD = V CC )LOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )500100015002000__________________________________________Typical Operating Characteristics(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)-6-5-4-3-2-10123456010002000300040005000MAX3241ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V)302010405060020001000300040005000MAX3241EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )04286121014010002000300040005000MAX3241ESLEW RATE vs. LOAD CAPACITANCEM A X 3237E t o c 05LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )-6-5-4-3-2-10123456010002000300040005000MAX3222E/MAX3232ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P UT V O L T A G E (V )624108141216010002000300040005000MAX3222E/MAX3232ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs)2520155103530404520001000300040005000MAX3222E/MAX3232E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers6_______________________________________________________________________________________Typical Operating Characteristics (continued)(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ωand C L , T A = +25°C, unless otherwise noted.)20604080100MAX3237ETRANSMITTER SKEW vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)100015005002000T R A N S M I T T E R S K E W (n s )-6-2-42046-3-51-1352.03.03.52.54.04.55.0SUPPLY VOLTAGE (V)T R A N S M I T T E R O U T P U T V O L T A G E (V )MAX3237ETRANSMITTER OUTPUT VOLTAGE vs. SUPPLY VOLTAGE (MBAUD = GND)10203040502.0MAX3237E SUPPLY CURRENT vs. SUPPLY VOLTAGE (MBAUD = GND)SUPPLY VOLTAGE (V)S U P P L Y C U R R E N T (m A )3.03.52.54.04.55.0MAX3246ETRANSMITTER OUTPUT VOLTAGEvs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R O U T P U T V O L T A G E (V )4000300010002000-5-4-3-2-101234567-65000468101214160MAX3246ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L EW R A T E (V /μs )200030001000400050001020304050600MAX3246EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCEM A X 3237E t o c 17LOAD CAPACITANCE (pF)S U P P L Y C U R R EN T (m A )1000200030004000500055453525155024681012MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = GND)LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )10001500500200025003000010203050406070MAX3237ESLEW RATE vs. LOAD CAPACITANCE(MBAUD = V CC )LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )5001000150020001020304050MAX3237ESUPPLY CURRENT vs. LOAD CAPACITANCE WHEN TRANSMITTING DATA (MBAUD = GND)LOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )10001500500200025003000MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________7Pin DescriptionM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers8_______________________________________________________________________________________MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_______________________________________________________________________________________9Detailed DescriptionDual Charge-Pump Voltage ConverterThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246Es’ internal power supply consists of a regu-lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V V CC range. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).RS-232 TransmittersThe transmitters are inverting level translators that con-vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli-ant levels.The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3k Ωin parallel with 1000pF,providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par-alleled to drive multiple receivers or mice.The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forcedinto a high-impedance state when the device is in shut-down mode (SHDN = G ND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown.The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC . The MAX3237E’s trans-mitter inputs have a 400k Ωactive positive-feedback resistor, allowing unused inputs to be left unconnected.MAX3237E MegaBaud OperationFor higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = V CC ), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3k Ωin parallel with 250pF for +3.0V < V CC < +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3k Ωin parallel with 1000pF.RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/MAX3246E receivers have inverting three-state outputs.Drive EN high to place the receiver(s) into a high-impedance state. Receivers can be either active or inactive in shutdown (Table 1).Figure 1. Slew-Rate Test CircuitsLapLink is a trademark of Traveling Software.M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers10______________________________________________________________________________________The complementary outputs on the MAX3237E/MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN . This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where V CC drops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).MAX3222E/MAX3237E/MAX3241E/MAX3246E Shutdown ModeSupply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to V CC , V- is pulled to ground, and the transmitter out-puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to V CC if shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis-charges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage.The ESD structures withstand high ESD in all states:normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup.Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications.SHDN T2OUTT1OUT5V/div2V/divV CC = 3.3V C1–C4 = 0.1μFFigure 3. Transmitter Outputs Recovering from Shutdown or Powering UpMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E are characterized for protection to the following limits:•±15kV using the Human Body Model•±8kV using the Contact Discharge method specified in IEC 1000-4-2•±9kV (MAX3246E only) using the Contact Discharge method specified in IEC 1000-4-2•±15kV using the Air-G ap Discharge method speci-fied in IEC 1000-4-2Figure 4a. Human Body ESD Test ModelFigure 4b. Human Body Model Current WaveformFigure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD Generator Current WaveformM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceiverscharacterized for protection to ±15kV per the Human Body Model.ESD Test ConditionsESD performance depends on a variety of conditions.Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body ModelFigure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest,which is then discharged into the test device through a 1.5k Ωresistor.IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level)of IEC 1000-4-2, without the need for additional ESD-protection components.The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The Air-G ap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.Machine ModelThe Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs.Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.Table 2. Required Minimum Capacitor ValuesFigure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per TransmitterTable 3. Logic-Family Compatibility with Various Supply VoltagesMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversApplications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val-ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1without also increasing the values of C2, C3, C4,and C BYPASS to maintain the proper ratios (C1 to the other capacitors).When using the minimum required capacitor values,make sure the capacitor value does not degradeexcessively with temperature. If in doubt, use capaci-tors with a larger nominal value. The capacitor’s equiv-alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+and V-.Power-Supply DecouplingIn most circumstances, a 0.1µF V CC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capacitors as close to the IC as possible.Operation Down to 2.7VTransmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.Figure 6b. Mouse Driver Test CircuitM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 TransceiversFigure 7. Loopback Test CircuitT1IN T1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V C1–C4 = 0.1μFFigure 8. MAX3241E Loopback Test Result at 120kbps T1INT1OUTR1OUT5V/div5V/div5V/divV CC = 3.3V, C1–C4 = 0.1μFFigure 9. MAX3241E Loopback Test Result at 250kbps+5V 0+5V 0-5V +5VT_INT_OUT5k Ω + 250pFR_OUTV CC = 3.3V C1–C4 = 0.1μFFigure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = V CC )Transmitter Outputs Recoveringfrom ShutdownFigure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two trans-mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3k Ωin parallel with 2500pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note thatthe transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.Mouse DrivabilityThe MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manu-facturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversFigure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.High Data RatesThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E maintain the RS-232 ±5V minimum transmit-ter output voltage even at high data rates. Figure 7shows a transmitter loopback test circuit. Figure 8shows a loopback test result at 120kbps, and Figure 9shows the same test at 250kbps. For Figure 8, all trans-mitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.The MAX3237E maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps.Figure 10 shows a loopback test result at 1Mbps with MBAUD = V CC . For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.Interconnection with 3V and 5V LogicThe MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3for more information on possible combinations of inter-connections.UCSP ReliabilityThe UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ-ment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it.Mechanical stress performance is a greater considera-tion for a UCSP package. UCSPs are attached through direct solder contact to the user’s PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be consid-ered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through envi-ronmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at .Table 4. Reliability Test DataM A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________________Pin ConfigurationsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 TransceiversPin Configurations (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers__________________________________________________Typical Operating CircuitsMAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)M A X 3222E /M A X 3232E /M A X 3237E /M A X 3241E †/M A X 3246EUp to 1Mbps, True RS-232 Transceivers_____________________________________Typical Operating Circuits (continued)MAX3222E/MAX3232E/MAX3237E/MAX3241E †/MAX3246EUp to 1Mbps, True RS-232 Transceivers______________________________________________________________________________________21Selector Guide___________________Chip InformationTRANSISTOR COUNT:MAX3222E/MAX3232E: 1129MAX3237E: 2110MAX3241E: 1335MAX3246E: 842PROCESS: BICMOSOrdering Information (continued)†Requires solder temperature profile described in the AbsoluteMaximum Ratings section. UCSP Reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this datasheet for more information.**EP = Exposed paddle.。

MAX323

MAX323精密,单电源,SPST模拟开关。

（Precision, Single-Supply,SPST Analog Switches）这些是我用有道翻译的，中英文我全部写出吧General DescriptionThe MAX323/MAX324/MAX325 are precision, dual,SPST analog switches. They are single-supply devicesdesigned to operate from +2.7V to +16V. The MAX323has two normally open (NO) switches, and the MAX324has two normally closed (NC) switches. The MAX325has one NO and one NC switch. Low power consumption(5μW) makes these parts ideal for battery-poweredequipment. These switches offer low leakage currents(100pA max) and fast switching speeds (tON = 150nsmax, tOFF = 100ns max).When powered from a 5V supply, the MAX323 seriesoffers 2½ max matching between channels, 60½ maxon-resistance, and 6½ max RON flatness.These switches also offer 5pC max charge injection,and a minimum of 2000V ESD per Method 3015.7.For equivalent devices specified for dual-supply operation,see the MAX320/MAX321/MAX322 data sheet. Forquad versions of the MAX320 series, see MAX391/MAX392/MAX393 data sheet.总体描述MAX323 / MAX324 / MAX325的精度,是二元性的,SPST模拟转换器。

MAX232中文资料(官方版)

________________________________ 应用
便携式计算机低功耗调制解调器接口转换电池供电 RS-232 系统多点 RS-232 网络
_____________________________ 定购信息
PART MAX220CPE MAX220CSE MAX220CWE MAX220C/D MAX220EPE MAX220ESE MAX220EWE MAX220EJE MAX220MJE TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO 16 Wide SO Dice* 16 Plastic DIP 16 Narrow SO 16 Wide SO 16 CERDIP 16 CERDIP
索取免费样品和最新版的数据资料，请访问 Maxim 的主页：。
+5V 供电、多通道 RS-232 驱动器/接收器 MAX220–MAX249
ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243
Supply Voltage (VCC) ...............................................-0.3V to +6V V+ (Note 1) ..................................................(VCC - 0.3V) to +14V V- (Note 1) .............................................................+0.3V to +14V Input Voltages TIN..............................................................-0.3V to (VCC - 0.3V) RIN (Except MAX220) ........................................................±30V RIN (MAX220).....................................................................±25V TOUT (Except MAX220) (Note 2) .......................................±15V TOUT (MAX220)...............................................................±13.2V Output Voltages TOUT ...................................................................................±15V ROUT .........................................................-0.3V to (VCC + 0.3V) Driver/Receiver Output Short Circuited to GND.........Continuous Continuous Power Dissipation (TA = +70°C) 16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) .842mW 18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW 20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW 16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW 16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW 20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW 20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW 16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW 18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW Operating Temperature Ranges MAX2_ _AC_ _, MAX2_ _C_ _ .............................0°C to +70°C MAX2_ _AE_ _, MAX2_ _E_ _ ..........................-40°C to +85°C MAX2_ _AM_ _, MAX2_ _M_ _ .......................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) (Note 3) ...................+300°C

中文芯片手册MAX3222EMAX3232EMAX3237EMAX3241EMAX3246E

MAX3222E/MAX3232E/MAX3237E/MAX3241E†/ MAX3246E的中文芯片手册±15kV ESD保护，电流低至10nA，3.0V至5.5V，高达1Mbps，的RS-232收发器概述该MAX3222E/MAX3232E/MAX3237E/MAX3241E /MAX3246E +3.0 V供电EIA/TIA-232和V.28/V.24通信接口器件具有低功耗，高数据速率的能力，以及增强的静电放电（ESD）保护。

增强型ESD结构保护所有发送器输出和接收器输入采用IEC 1000-4-2气隙放电，±8kV使用IEC 1000-4-2接触放电（MAX3246E为±9kV ），±15kV使用人体模型。

基于上述标准，MAX3237E的逻辑和接收I / O 引脚将被保护，而发射机输出引脚的保护利用人体模型±15kV的。

一个专有的低压差发送器输出级可以提供+3.0 V至+5.5 V电源真正的RS -232性能，利用内部双电荷泵。

充电泵仅需要四个工作在+3.3 V电源的0.1μF的小电容。

每款器件保证工作在250kbps数据速率下维持RS - 232输出电平。

该MAX3237E保证操作在250kbps在正常工作模式和1Mbps的中MegaBaud™工作模式，同时保持RS- 232兼容的输出电平。

MAX3222E/MAX3232E包括两个接收器和两个发射器。

MAX3222E具有1μA关断模式，可降低功耗的电池供电的便携式系统。

该MAX3222E接收器仍活跃在关断模式下，允许监控外部设备的同时仅需耗电1μA供应电流。

TheMAX3222E和MAX3232E的引脚，封装，并与业界标准的MAX242和MAX232，分别为功能兼容。

该MAX3241E/MAX3246E是专为笔记本电脑和小型笔记本电脑设计完整串口（3个驱动器/5个接收器）。

该MAX3237E（5驱动器/ 三个接收器），非常适合那些需要快速数据传输的外围设备。