MAX3444EESA+中文资料
AO4443中文资料
SymbolTyp Max 24405475R θJL 2130°C/W Maximum Junction-to-Ambient A Steady-State °C/W Maximum Junction-to-Lead CSteady-State°C/WThermal Characteristics ParameterUnits Maximum Junction-to-Ambient A t ≤ 10s R θJA AO4443AO4443SymbolMin TypMaxUnits BV DSS -40V -1T J =55°C-5I GSS ±100nA V GS(th)-1-1.9-3V I D(ON)-20A 33.342T J =125°C54684863m Ωg FS 14S V SD -0.75-1V I S-6A C iss 657pF C oss 143pF C rss 63pF R g6.5ΩQ g (10V)14.2nC Q g (4.5V)7.1nC Q gs 2.2nC Q gd 4.1nC t D(on)7.7ns t r 8ns t D(off)26.5ns t f 11.5ns t rr 21.9ns Q rr14.9nCTHIS PRODUCT HAS BEEN DESIGNED AND QUALIFIED FOR THE CONSUMER MARKET. APPLICATIONS OR USES AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS ARE NOT AUTHORIZED. AOS DOES NOT ASSUME ANY LIABILITY ARISING OUT OF SUCH APPLICATIONS OR USES OF ITS PRODUCTS. AOS RESERVES THE RIGHT TO IMPROVE PRODUCT DESIGN,FUNCTIONS AND RELIABILITY WITHOUT NOTICE.Body Diode Reverse Recovery Time I F =-6A, dI/dt=100A/µs Body Diode Reverse Recovery ChargeI F =-6A, dI/dt=100A/µsTurn-On DelayTime V GS =-10V, V DS =-20V, R L =3.7Ω, R GEN =3ΩTurn-On Rise Time Turn-Off DelayTime Turn-Off Fall TimeTotal Gate Charge (4.5V)Gate Source Charge Gate Drain Charge SWITCHING PARAMETERSTotal Gate Charge (10V)V GS =-10V, V DS =-20V, I D =-6AReverse Transfer Capacitance Gate resistanceDYNAMIC PARAMETERS Input Capacitance V GS =0V, V DS =-20V, f=1MHz V GS =0V, V DS =0V, f=1MHzDiode Forward Voltage I S =-1A,V GS =0V Maximum Body-Diode Continuous CurrentOutput Capacitance V DS =-5V, I D =-6AR DS(ON)Static Drain-Source On-ResistanceForward TransconductanceV GS =-10V, I D =-6Am ΩV GS =-4.5V, I D =-5AGate Threshold Voltage V DS =V GS I D =-250µA On state drain currentV GS =-10V, V DS =-5V µA Gate-Body leakage current V DS =0V, V GS =±20V Drain-Source Breakdown Voltage I D =-250µA, V GS =0V I DSS Zero Gate Voltage Drain Current V DS =-32V, V GS =0VP-Channel Electrical Characteristics (T J =25°C unless otherwise noted)ParameterConditions STATIC PARAMETERS A: The value of R value in any a given application depends on the user's specific board design. The current rating is based on the t ≤ 10s thermal resistance rating. θJA is measured with the device mounted on 1in 2FR-4 board with 2oz. Copper, in a still air environment with T A =25°C. The value in any given application depends on the user's specific board design. The current rating is based on the t ≤ 10s thermal resistance rating.B: Repetitive rating, pulse width limited by junction temperature.C. The R θJA is the sum of the thermal impedence from junction to lead R θJL and lead to ambient.D. The static characteristics in Figures 1 to 6,12,14 are obtained using 80 µs pulses, duty cycle 0.5% max.E. These tests are performed with the device mounted on 1 in 2FR-4 board with 2oz. Copper, in a still air environment with T A =25°C. The SOA curve provides a single pulse rating. Rev 1 : Aug 2005AO4443AO4443。
MAX产品后缀说明
MAX 产品后缀说明MAX 产品后缀说明三位后缀例: MAX1675E U A温度范围封装形式管脚数四位后缀另有一些MAXIM 产品后缀用四位表示,第一位表示产品精度等级;第二位表示温度范围：精度,后三位同三位后缀的IC.第三位表示封装形式;第四位表示产品管脚数。
例如：MAX631ACPA 第一个”A”表示5%的输出温度范围C 0°C - 70°C A -40°C - +125°CI -20°C - +85°C M -55 °C - +125°CE -40°C - +85°C封装形式A SSOP(密脚表面贴装)B CERQUAD(陶瓷方形封装)C TO220,TQFP(薄的四方表贴封装)D 陶瓷SB 封装E QSOP(四方表面贴封装)F 陶瓷Flat 封装H 模块SBGA 5*5TQFP J 陶瓷双列直插K SOT L LCCM MQFP(公制四方扁平封装) N 窄体陶瓷双列直插P 塑封DIP(双列直插) Q PLCCR 窄体陶瓷DIP S SO 表面贴封装T TO5,TO99,TO100 U TSSOP,uMAX,SOTV TO39 W 宽体SOX SC70 Y 窄SBZ TO92,MQUAD /D DICE(裸片)/PR 硬塑料/W 晶原管脚数A 8 N 18B 10,64 O 42C 12,192 P 20D 14 Q 2,100E 16 R 3,84F 22,256 S 4,80G 24 T 6,160H 44 U 38,60I 28 V 8(圆脚,隔离型)J 32 W 10(圆脚,隔离型)K 5,68 X 8L 40 Y 8(圆脚,隔离型)M 7,48 Z 10(圆脚,隔离型)。
MAX11203EEE+;MAX11203EEE+T;MAX11213EEE+T;MAX11213EEE+;MAX11213EVKIT+;中文规格书,Datasheet资料
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Features
MAX11203/MAX11213
Applications
Sensor Measurement (Temperature and Pressure) Portable Instrumentation Battery Applications Weigh Scales
Ordering Information
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
________________________________________________________________ Maxim Integrated Products 1
16-Bit, Single-Channel, Ultra-Low-Power, DeltaSigma ADCs with Programmable Gain and GPIO MAX11203/MAX11213
ABSOLUTE MAXIMUM RATINGS
Any Pin to GND.....................................................-0.3V to +3.9V AVDD to GND. .......................................................-0.3V to +3.9V DVDD to GND.......................................................-0.3V to +3.9V Analog Inputs (AINP, AINN, REFP, REFN) to GND ............................................. -0.3V to (VAVDD + 0.3V) Digital Inputs and Digital Outputs to GND ............................................. -0.3V to (VDVDD + 0.3V) ESDHB (AVDD, AINP, AINN, REFP, REFN, DVDD, CLK, CS, SCLK, DIN, RDY/DOUT, GND, GPIO_) . .......... Q2kV (Note 1) Continuous Power Dissipation (TA = +70NC) 16-Pin QSOP (derate 8.3mW/NC above +70NC). ..........667mW Operating Temperature Range........................... -40NC to +85NC Junction Temperature......................................................+150NC Storage Temperature Range. ............................ -55NC to +150NC Lead Temperature (soldering, 10s).................................+300NC Soldering Temperature (reflow).......................................+260NC
MAX3490EESA+中文资料
General DescriptionDevices in the MAX3483E family (MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E) are ±15kV ESD-protected, +3.3V, low-power transceivers for RS-485 and RS-422 communications. Each device con-tains one driver and one receiver. The MAX3483E and MAX3488E feature slew-rate-limited drivers that minimize EMI and reduce reflections caused by improperly termi-nated cables, allowing error-free data transmission at data rates up to 250kbps. The partially slew-rate-limited MAX3486E transmits up to 2.5Mbps. The MAX3485E,MAX3490E, and MAX3491E transmit at up to 12Mbps.All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge, and ±15kV using the Human Body Model.Drivers are short-circuit current limited and are protect-ed against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit.The MAX3488E, MAX3490E, and MAX3491E feature full-duplex communication, while the MAX3483E,MAX3485E, and MAX3486E are designed for half-duplex communication.ApplicationsTelecommunicationsIndustrial-Control Local Area Networks Transceivers for EMI-Sensitive Applications Integrated Services Digital Networks Packet SwitchingFeatureso ESD Protection for RS-485 I/O Pins±15kV—Human Body Model±8kV—IEC 1000-4-2, Contact Discharge ±15kV—IEC 1000-4-2, Air-Gap Discharge o Operate from a Single +3.3V Supply—No Charge Pump Required o Interoperable with +5V Logic o Guaranteed 12Mbps Data Rate (MAX3485E/MAX3490E/MAX3491E)o Slew-Rate Limited for Errorless Data Transmission (MAX3483E/MAX3488E) o 2nA Low-Current Shutdown Mode(MAX3483E/MAX3485E/MAX3486E/MAX3491E)o -7V to +12V Common-Mode Input Voltage Range o Full-Duplex and Half-Duplex Versions Available o Industry-Standard 75176 Pinout (MAX3483E/MAX3485E/MAX3486E)o Current-Limiting and Thermal Shutdown for Driver Overload ProtectionMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers________________________________________________________________Maxim Integrated Products119-1474; Rev 0; 4/99Selector GuideOrdering InformationOrdering Information continued at end of data sheet.For free samples & the latest literature: , or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceiversABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS(V = +3.3V ±0.3V, T = T to T , unless otherwise noted. Typical values are at T = +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.Supply Voltage (V CC ).............................................................+7V Control Input Voltage (RE , DE).................................-0.3V to +7V Driver Input Voltage (DI)...........................................-0.3V to +7V Driver Output Voltage (A, B, Y, Z).......................-7.5V to +12.5V Receiver Input Voltage (A, B)..............................-7.5V to +12.5V Receiver Output Voltage (RO)....................-0.3V to (V CC + 0.3V)Continuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C).....727mW14-Pin SO (derate 8.33mW/°C above +70°C)................667mW 14-Pin Plastic DIP (derate 10mW/°C above +70°C)......800mW Operating Temperature RangesMAX34_ _ EC_ _...................................................0°C to +70°C MAX34_ _ EE_ _.................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10sec).............................+300°CMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceiversDC ELECTRICAL CHARACTERISTICS (continued)(V CC = +3.3V ±0.3V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)DRIVER SWITCHING CHARACTERISTICS—MAX3485E/MAX3490E/MAX3491E(V = +3.3V, T = +25°C.)DRIVER SWITCHING CHARACTERISTICS—MAX3486E(V = +3.3V, T = +25°C.)*MAX3488E and MAX3491E will be compliant to ±8kV per IEC 1000-4-2 Contact Discharge by September 1999.M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers4_______________________________________________________________________________________DRIVER SWITCHING CHARACTERISTICS—MAX3483E/MAX3488E(V CC = +3.3V, T A = +25°C.)RECEIVER SWITCHING CHARACTERISTICS(V CC = +3.3V, T A = +25°C.)Note 1:∆V OD and ∆V OC are the changes in V OD and V OC , respectively, when the DI input changes state.Note 2:Measured on |t PLH (Y) - t PHL (Y)|and |t PLH (Z) - t PHL (Z)|.Note 3:The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, thedevices are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the devices are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section.MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers_______________________________________________________________________________________5Typical Operating Characteristics(V CC = +3.3V, T A = +25°C, unless otherwise noted.)252015105000.51.01.52.02.53.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT LOW VOLTAGEM A X 3483E -01OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )-20-18-16-14-12-10-8-6-4-2000.51.01.52.02.53.53.0OUTPUT CURRENT vs.RECEIVER OUTPUT HIGH VOLTAGEM A X 3483E -02OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )3.003.053.103.153.203.253.30-40-20020406010080RECEIVER OUTPUT HIGH VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T H I G H V O L T A G E (V )00.10.20.30.40.50.60.70.8-40-2020406010080RECEIVER OUTPUT LOW VOLTAGEvs. TEMPERATURETEMPERATURE (°C)O U T P U T L O W V O L T A G E (V )2505075100125150175024681012OUTPUT CURRENT vs.DRIVER OUTPUT LOW VOLTAGEM A X 3483E -07OUTPUT LOW VOLTAGE (V)O U T P U T C U R R E N T (m A )100908070605040302010000.5 1.0 1.5 2.0 2.5 3.53.0DRIVER OUTPUT CURRENT vs.DIFFERENTIAL OUTPUT VOLTAGEM A X 3483E -05DIFFERENTIAL OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )1.61.71.81.92.02.12.22.32.42.62.5-40-20020406010080DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURETEMPERATURE (°C)D I F FE R E N T I A L O U T P U T V O L T A G E (V )-100-80-60-40-20543210-7-6-3-4-5-2-1OUTPUT CURRENT vs.DRIVER OUTPUT HIGH VOLTAGEM A X 3483E -08OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers0.80.70.91.01.11.2-40-2020406010080SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )Typical Operating Characteristics (continued)(V CC = +3.3V, T A = +25°C, unless otherwise noted.)0102030405060708010090-40-2020406010080SHUTDOWN CURRENT vs. TEMPERATUREM A X 3483E -10TEMPERATURE (°C)S H U T D O W N C U R R E N T (n A )Pin DescriptionMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers_______________________________________________________________________________________7Figure 2. MAX3488E/MAX3490E Pin Configuration and Typical Operating CircuitFigure 3. MAX3491E Pin Configuration and Typical Operating CircuitFigure 1. MAX3483E/MAX3485E/MAX3486E Pin Configuration and Typical Operating CircuitM A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers8_______________________________________________________________________________________Figure 4. Driver V OD and V OC Figure 7. Driver Differential Output Delay and Transition TimesFigure 6. Receiver V OH and V OLFigure 5. Driver V OD with Varying Common-Mode VoltageMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers_______________________________________________________________________________________9Figure 8. Driver Propagation TimesFigure 9. Driver Enable and Disable Times (t PZH , t PSH , t PHZ )Figure 10. Driver Enable and Disable Times (t PZL , t PSL , t PLZ )M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers10______________________________________________________________________________________Figure 11. Receiver Propagation DelayFigure 12. Receiver Enable and Disable TimesNote 4: The input pulse is supplied by a generator with the following characteristics: f = 250kHz, 50% duty cycle, t r ≤6.0ns, Z O = 50Ω.Note 5: C L includes probe and stray capacitance._____________________Function TablesDevices with Receiver/Driver Enable(MAX3483E/MAX3485E/MAX3486E/MAX3491E)Table 1. Transmitting* B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491E).X = Don’t care; High-Z = High impedanceTable 2. Receiving* DE is a “don’t care” (x) for the full-duplex part (MAX3491E).X = Don’t care; High-Z = High impedanceDevices without Receiver/Driver Enable(MAX3488E/MAX3490E)Table 3. TransmittingTable 4. Receiving___________Applications InformationThe MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E are low-power transceivers for RS-485 and RS-422 communications. The MAX3483E and MAX3488E can transmit and receive at data rates up to 250kbps, the MAX3486E at up to 2.5Mbps, and the MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The MAX3488E/MAX3490E/MAX3491E are full-duplex trans-ceivers, while the MAX3483E/MAX3485E/MAX3486E are half-duplex. Driver Enable (DE) and Receiver Enable (RE ) pins are included on the MAX3483E/MAX3485E/MAX3486E/MAX3491E. When disabled, the driver and receiver outputs are high impedance.Reduced EMI and Reflections (MAX3483E/MAX3486E/MAX3488E)The MAX3483E/MAX3488E are slew-rate limited, mini-mizing EMI and reducing reflections caused by improp-erly terminated cables. Figure 13 shows the driver output waveform of a MAX3485E/MAX3490E/MAX3491E transmitting a 125kHz signal, as well as the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same information, but for the slew-rate-limited MAX3483E/MAX3488E transmitting the same signal. The high-frequency harmonics have much lower amplitudes,and the potential for EMI is significantly reduced.Low-Power Shutdown Mode(MAX3483E/MAX3485E/MAX3486E/MAX3491E)A low-power shutdown mode is initiated by bringing both RE high and DE low. The devices will not shut down unless both the driver and receiver are disabled (high impedance). In shutdown, the devices typically draw only 2nA of supply current.For these devices, the t PSH and t PSL enable times assume the part was in the low-power shutdown mode;the t PZH and t PZL enable times assume the receiver or driver was disabled, but the part was not shut down.MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers______________________________________________________________________________________11INPUTS OUTPUT A, B RO ≥+0.2V 1≤-0.2V 0Inputs Open1INPUT OUTPUTS DI Z Y 101015MHz 500kHz/div 05MHz500kHz/div Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/MAX3490E/MAX3491E Transmitting a 125kHz Signal Figure 14. Driver Output Waveform and FFT Plot of MAX3483E/ MAX3488E Transmitting a 125kHz SignalM A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers12______________________________________________________________________________________Figure 17. MAX3483E/MAX3488E Driver Propagation Delay Figure 19. MAX3483E/MAX3488E System Differential Voltage at 125kHz Driving 4000 Feet of Cable Figure 20. MAX3485E/MAX3490E/MAX3491E System Differential Voltage at 125kHz Driving 4000 Feet of CableDriver-Output Protection Excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics). In addition, a thermal shut-down circuit forces the driver outputs into a high-imped-ance state if the die temperature rises excessively.Propagation Delay Figures 15–18 show the typical propagation delays. Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle).The receiver skew time, |t PRLH- t PRHL|, is under 10ns (20ns for the MAX3483E/MAX3488E). The driver skew times are 8ns for the MAX3485E/MAX3490E/MAX3491E, 12ns for the MAX3486E, and typically under 50ns for the MAX3483E/MAX3488E.Line Length vs. Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 21 for an example of a line repeater.Figures 19 and 20 show the system differential voltage for parts driving 4000 feet of 26AWG twisted-pair wire at 125kHz into 120Ωloads.For faster data rate transmission, please consult the fac-tory.±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3483E family of devices 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 or damage.ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits:1)±15kV using the Human Body Model2)±8kV using the Contact-Discharge method specifiedin IEC 1000-4-23)±15kV using IEC 1000-4-2’s Air-Gap method.ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body Model Figure 22a shows the Human Body Model and Figure 22b 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 inter-est, which is then discharged into the test device through a 1.5kΩresistor.IEC 1000-4-2 The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3483E family of devices helps 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 23a shows the IEC 1000-4-2 model, and Figure 23b shows the current waveform for the ±8kV IEC 1000-4-2, Level 4 ESD contact-discharge test.Figure 21. Line Repeater for MAX3488E/MAX3490E/MAX3491EMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers ______________________________________________________________________________________13M A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491EThe air-gap 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 when I/O pins are contacted by handling equipment during test and assembly. Of course, all pins require this protection, not just RS-485 inputs and outputs.Typical ApplicationsThe MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 24 and 25 show typical net-work applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 21.To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. The slew-rate-limited MAX3483E/MAX3488E and the partially slew-rate-limited MAX3486E are more tolerant of imperfect termination.3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers14______________________________________________________________________________________Figure 22a. Human Body ESD Test ModelFigure 22b. Human Body Current WaveformFigure 23a. IEC 1000-4-2 ESD Test ModelFigure 23b. IEC 1000-4-2 ESD Generator Current WaveformMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceivers______________________________________________________________________________________15Figure 25. MAX3488E/MAX3490E/MAX3491E Full-Duplex RS-485 NetworkFigure 24. MAX3483E/MAX3485E/MAX3486E Typical RS-485 NetworkM A X 3483E /M A X 3485E /M A X 3486E /M A X 3488E /M A X 3490E /M A X 3491E3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited T rue RS-485/RS-422 T ransceiversTRANSISTOR COUNT: 761Chip InformationOrdering Information (continued)Maxim 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.16____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©1999 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.。
max3485esa中文资料
General Description The MAX3483, MAX3485, MAX3486, MAX3488,MAX3490, and MAX3491 are 3.3V , low-power transceivers forRS-485 and RS-422 communication. Each part containsone driver and one receiver. The MAX3483 and MAX3488feature slew-rate-limited drivers that minimize EMI andreduce reflections caused by improperly terminatedcables, allowing error-free data transmission at data ratesup to 250kbps. The partially slew-rate-limited MAX3486transmits up to 2.5Mbps. The MAX3485, MAX3490, andMAX3491 transmit at up to 10Mbps.Drivers are short-circuit current-limited and are protectedagainst excessive power dissipation by thermal shutdowncircuitry that places the driver outputs into a high-imped-ance state. The receiver input has a fail-safe feature thatguarantees a logic-high output if both inputs are opencircuit.The MAX3488, MAX3490, and MAX3491 feature full-duplex communication, while the MAX3483, MAX3485, andMAX3486 are designed for half-duplex communication.Applications ●Low-Power RS-485/RS-422 Transceivers ●Telecommunications ●Transceivers for EMI-Sensitive Applications ●Industrial-Control Local Area NetworksFeatures●Operate from a Single 3.3V Supply—No Charge Pump!●Interoperable with +5V Logic ●8ns Max Skew (MAX3485/MAX3490/MAX3491)●Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488)●2nA Low-Current Shutdown Mode (MAX3483/MAX3485/MAX3486/MAX3491)●-7V to +12V Common-Mode Input Voltage Range ●Allows up to 32 Transceivers on the Bus ●Full-Duplex and Half-Duplex Versions Available ●Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486)●Current-Limiting and Thermal Shutdown for Driver Overload Protection 19-0333; Rev 1; 5/19Ordering Information continued at end of data sheet.*Contact factory for for dice specifications.PARTTEMP . RANGE PIN-PACKAGE MAX3483CPA0°C to +70°C 8 Plastic DIP MAX3483CSA0°C to +70°C 8 SO MAX3483C/D0°C to +70°C Dice*MAX3483EPA-40°C to +85°C 8 Plastic DIP MAX3483ESA-40°C to +85°C 8 SO MAX3485CPA0°C to +70°C 8 Plastic DIP MAX3485CSA0°C to +70°C 8 SO MAX3485C/D0°C to +70°C Dice*MAX3485EPA-40°C to +85°C 8 Plastic DIP MAX3485ESA -40°C to +85°C 8 SO PARTNUMBERGUARANTEED DATA RATE (Mbps)SUPPLY VOLTAGE (V)HALF/FULL DUPLEX SLEW-RATE LIMITED DRIVER/RECEIVER ENABLE SHUTDOWN CURRENT (nA)PIN COUNT MAX34830.25 3.0 to 3.6Half Yes Yes 28MAX348510Half No No 28MAX34862.5Half Yes Yes 28MAX34880.25Half Yes Yes —8MAX349010Half No No —8MAX349110Half No Yes 214MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491Selection TableOrdering Information找电子元器件上宇航军工Figure 1. MAX3483/MAX3485/MAX3486 Pin Configuration and Typical Operating Circuit Figure 2. MAX3488/MAX3490 Pin Configuration and Typical Operating Circuit Figure 3. MAX3491 Pin Configuration and Typical Operating CircuitMAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 TransceiversFigure 22. MAX3488/MAX3490/MAX3491 Full-Duplex RS-485 NetworkFigure 23. Line Repeater for MAX3488/MAX3490/MAX3491MAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 Transceivers。
MEMORY存储芯片MAX3490EESA+T中文规格书
Figure 1. MAX3483/MAX3485/MAX3486 Pin Configuration and Typical Operating Circuit Figure 2. MAX3488/MAX3490 Pin Configuration and Typical Operating Circuit Figure 3. MAX3491 Pin Configuration and Typical Operating CircuitMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 TransceiversDriver Output ProtectionExcessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. A foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see Typical Operating Characteristics ). In addition, a thermal shut-down circuit forces the driver outputs into a high-impedance state if the die temperature rises excessively.Propagation Delay Figures 15–18 show the typical propagation delays. Skew time is simply the difference between the low-to-high and high-to-low propagation delay. Small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle).The receiver skew time, |t PRLH - t PRHL |, is under 10ns (20ns for the MAX3483/MAX3488). The driver skew times are 8ns for the MAX3485/MAX3490/MAX3491, 11ns for the MAX3486, and typically under 100ns for the MAX3483/MAX3488.Line Length vs. Data Rate The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, see Figure 23.Figures 19 and 20 show the system differential voltage for parts driving 4000 feet of 26AWG twisted-pair wire at 125kHz into 120Ω loads.Typical ApplicationsThe MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 transceivers are designed for bidirectional data communications on multipoint bus transmission lines. Figures 21 and 22 show typical net-work applications circuits. These parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in Figure 23.To minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as pos-sible. The slew-rate-limited MAX3483/MAX3488 and the partially slew-rate-limited MAX3486 are more tolerant of imperfect termination.Figure 21. MAX3483/MAX3485/MAX3486 Typical RS-485 NetworkMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers。
MAX3225EAAP+中文资料
________________General DescriptionThe MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E are 3V-powered EIA/TIA-232and V.28/V.24 communications interfaces with automat-ic shutdown/wakeup features, high data-rate capabili-ties, and enhanced electrostatic discharge (ESD)protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge,and ±15kV using the Human Body Model.All devices achieve a 1µA supply current using Maxim’s revolutionary AutoShutdown Plus™ feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive,and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiv-er input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system.The MAX3225E/MAX3227E/MAX3245E also feature MegaBaud™ operation, guaranteeing 1Mbps for high-speed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guar-antee 250kbps operation. The transceivers have a pro-prietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a 3.3V supply. The MAX3224E–MAX3227E feature a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.All devices are available in a space-saving TQFN,SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/MAX3245E) packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers Cellular PhonesBattery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Space-Constrained Applications:MAX3228E/MAX3229E: ±15kV ESD-Protected,+2.5V to +5.5V, RS-232 Transceivers in UCSP MAX3222E/MAX3232E/MAX3241E †/MAX3246E:±15kV ESD-Protected, Down to 10nA, +3.0V to +5.5V, Up to 1Mbps, True RS-232 Transceivers (MAX3246E Available in UCSP™)♦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 PinsMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus________________________________________________________________Maxim Integrated Products119-1339; Rev 9; 2/07Ordering Information continued at end of data sheet.*EP = Exposed paddle.†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.AutoShutdown Plus, MegaBaud, and UCSP are trademarks of Maxim Integrated Products, Inc.Ordering InformationFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; 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.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, 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 (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)....1666.7mW20-Pin TQFN (derate 21.3mW/°C above +70°C)....1702.1mW 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 (derate 10.9mW/°C above +70°C).......879mW 28-Pin Wide SO (derate 12.5mW/°C above +70°C)............1W 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin TSSOP (derate 12.8mW/°C above +70°C).......1026mW 36-Pin TQFN (derate 26.3mW/°C above +70°C)...........2105mW Operating Temperature Ranges MAX32_ _EC_ _.................................................0°C to +70°C MAX32_ _EE_ _................................................-40°C to +85°C MAX32_ _EAA_..............................................-40°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T A = T MIN to T MAX ,unless otherwise noted. Typical values are at T A = +25°C.)M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3224E/MAX3226E/MAX3244E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T A = T MIN to T MAX ,unless otherwise noted. Typical values are at T A = +25°C.)TIMING CHARACTERISTICS—MAX3225E/MAX3227E/MAX3245E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T A = T MIN to T MAX ,unless otherwise noted. Typical values are at T= +25°C.)Note 3:Transmitter skew is measured at the transmitter zero cross points.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________5-6-5-4-3-2-10123456010002000300040005000MAX3224E/MAX3226ETRANSMITTER 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 )246810121416010002000300040005000MAX3224E/MAX3226ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )5101520253035404520001000300040005000MAX3224E/MAX3226E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )-7.50-2.5-5.02.55.07.501000500150020002500MAX3225E/MAX3227ETRANSMITTER 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 )1510520253035404550010005001500200025003000MAX3225E/MAX3227E TRANSMITTER SKEW vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R S K E W (n s)807060504030201005001000150020002500MAX3225E/MAX3227ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )2010403060507090801005001000150020002500MAX3225E/MAX3227E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20242230282636343238-40020-20406080100MAX3224E–MAX3227E READY TURN-ON TIME vs. TEMPERATURETEMPERATURE (°C)R E A D Y T U R N -O N T I M E (μs )__________________________________________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.)20018016014012010080604020-40020-20406080100MAX3224E–MAX3227E READY TURN-OFF TIME vs. TEMPERATUREM A X 3224-7/44/45E -09TEMPERATURE (°C)R E A D Y T U R N -O F F T I M E (n s )M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 6____________________________________________________________________________________________________________________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.)-6-5-4-3-2-10123456010002000300040005000MAX3244ETRANSMITTER 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 )4286121014010002000300040005000MAX3244ESLEW RATE vs. LOAD CAPACITANCEM A X 3224-7/44/45E -11LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )302010405060020001000300040005000MAX3244EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )-7.50-2.5-5.02.55.07.50800400120016002000MAX3245ETRANSMITTER 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 )2010403060507090801000400800120016002000MAX3245EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )201040306050700400800120016002000MAX3245ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )1510520253035404550100020003000MAX3245E TRANSMITT SKEW vs. LOAD CAPACITANCEM A X 3224-7/44/45E -16LOAD CAPACITANCE (pF)T R A N S M I T T E R S K E W (n s )MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________7M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 8_______________________________________________________________________________________Dual Charge-Pump Voltage ConverterThe MAX3224E–MAX3227E/MAX3244E/MAX3245E’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), over the +3.0V to +5.5V range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5V, the charge pump ischarge-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.The READY output (MAX3224E–MAX3227E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________9RS-232 TransmittersThe transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3224E/MAX3226E/MAX3244E guarantee a 250kbps data rate (1Mbps, for the MAX3225E/MAX3227E/MAX3245E) with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC com-munication software (such as LapLink™). Transmitters can be paralleled to drive multiple receivers. Figure 1shows a complete system connection.When FORCEOFF is driven to ground or when the Auto-Shutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30s, the transmitters are disabled and the outputs go into a high-impedance state. When powered off or shut down, the outputs can be driven to ±12V. The transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC .Figure 1. Interface Under Control of PMUFigure 2. The MAX3244E/MAX3245E detect RS-232 activity when the UART and interface are shut down.LapLink is a trademark of Traveling Software.M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 10______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3224E–MAX3227E feature inverting outputs that always remain active (Table 1).The MAX3244E/MAX3245E have inverting three-state outputs that are high impedance when shut down (FORCEOFF = GND) (Table 1).The MAX3244E/MAX3245E feature an extra, always active, noninverting output, R2OUTB. R2OUTB output monitors receiver activity while the other receivers are high impedance, allowing ring indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for sys-tems where V CC is set to ground in shutdown to accommodate peripherals such as UARTs (Figure 2).The MAX3224E–MAX3227E/MAX3244E/MAX3245E fea-ture an INVALID output that is enabled low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiv-er input’s condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4).AutoShutdown Plus ModeThe MAX3224E–MAX3227E/MAX3244E/MAX3245E achieve a 1µA supplycurrent with Maxim’s AutoShutdown Plus feature, which operates when FORCEOFF is high and a FORCEON is low. When these devices do not sense a valid signal transition on any receiver and trans-mitter input for 30s, the on-board charge pumps are shut down, reducing supply current to 1µA. This occurs if the RS-232 cable is disconnected or if the connectedTable 1. Output Control Truth TableX = Don’t care*INVALID connected to FORCEON**INVALID connected to FORCEON and FORCEOFFMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plusperipheral transmitters are turned off, and the UART dri-ving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the sys-tem saves power without changes to the existing BIOS or operating system.Figures 3a and 3b depict valid and invalid RS-232receiver voltage levels. INVALID indicates the receiver input’s condition, and is independent of FORCEON and FORCEOFF states. Figure 3 and Tables 1 and 2 sum-marize the operating modes of the MAX3224E–MAX3227E/MAX3244E/MAX3245E. FORCEON and FORCEOFF override AutoShutdown Plus circuitry.When neither control is asserted, the IC selects between these states automatically based on the last receiver or transmitter input edge received.When shut down, the device’s charge pumps turn off,V+ is pulled to V CC , V- is pulled to ground, the transmit-ter outputs are high impedance, and READY (MAX3224E–MAX3227E) is driven low. The time required to exit shutdown is typically 100µs (Figure 8).By connecting FORCEON to INVALID , the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level and no receiver or transmitter edge is detected for 30s, and wake up when a valid receiver level or receiver or transmitter edge is detected.Figure 3a. INVALID Functional Diagram, INVALID Low Figure 3b. INVALID Functional Diagram, INVALID HighFigure 3c. AutoShutdown Plus LogicFigure 3d. Power-Down LogicFigure 4a. Receiver Positive/Negative Thresholds for INVALIDM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusBy connecting FORCEON and FORCEOFF to INVALID ,the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level is detected and wake up when a valid receiver level is detected (same functionality as AutoShutdown feature on MAX3221E/MAX3223E/MAX3243E).A mouse or other system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3244E/MAX3245E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232ports on both systems remain enabled.Software-Controlled ShutdownIf direct software control is desired, use INVALID to indicate DTR or ring indicator signal. Tie FORCEOFF and FORCEON together to bypass the AutoShutdown Plus so the line acts like a SHDN input.±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostaticdischarges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3224E–MAX3227E/MAX3244E/MAX3245E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protectFigure 4b. AutoShutdown Plus, INVALID,and READY Timing DiagramFigure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another SystemMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plusthese 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.ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits:1)±15kV using the Human Body Model2)±8kV using the Contact-Discharge Method specified in IEC1000-4-23)±15kV using IEC1000-4-2’s Air-Gap Method.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 6a shows the Human Body Model and Figure 6b 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 inter-est, which is then discharged into the test device through a 1.5k Ωresistor.Figure 6b. Human Body Current WaveformFigure 7b. IEC1000-4-2 ESD Generator Current WaveformFigure 6a. Human Body ESD Test Model Figure 7a. IEC1000-4-2 ESD Test ModelM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus IEC1000-4-2The IEC1000-4-2 standard covers ESD testing and per-formance of finished equipment; it does not specifically refer to integrated circuits. The MAX3224E–MAX3227E,MAX3244E/MAX3245E help you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, with-out the need for additional ESD-protection components.The major difference between tests done using the H uman Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2, because series resistance is lower in the IEC1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC1000-4-2 is generally lower than that measured using the H uman Body Model. Figure 7a shows the IEC1000-4-2 model and Figure 7b shows the current waveform for the 8kV,IEC1000-4-2, Level 4, ESD Contact-Discharge Method.The Air-Gap Method 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. Of course, all pins require this protec-tion during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitorscan be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 3 for required capacitor values. Do not use val-ues smaller than those listed in Table 3. 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 degrade excessively 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 that are sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capaci-tors as close to the IC as possible.Transmitter Outputs when Exiting ShutdownFigure 8 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). Each5μs/divV CC = 3.3V C1–C4 = 0.1μFFigure 8. Transmitter Outputs when Exiting Shutdown or Powering Uptransmitter is loaded with 3k Ωin parallel with 1000pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately -3V.High Data RatesThe MAX3224E/MAX3226E/MAX3244E maintain the RS-232 ±5.0V minimum transmitter output voltage even at high data rates. Figure 9 shows a transmitter loop-back test circuit. Figure 10 shows a loopback test result at 120kbps, and Figure 11 shows the same test at 250kbps. For Figure 10, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 11, a single transmitter was dri-ven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 250pF.The MAX3225E/MAX3227E/MAX3245E maintain the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps (MegaBaud). Figure 12 shows a loopback test result with a single transmitter driven at 1Mbps and all transmitters loaded with an RS-232receiver in parallel with 250pF.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusFigure 9. Loopback Test CircuitFigure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 120kbps2μs/divV CC = 3.3VFigure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 250kbps2μs/divV CC = 3.3VFigure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test Result at 1Mbps200ns/div5V/div5V/div5V/divV CC = 3.3VM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus Figure 13a. Mouse Driver Test CircuitMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusMouse DriveabilityThe MAX3244E/MAX3245E are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3244E/MAX3245E successfully drove all serial mice tested and met their respective current and voltage requirements. The MAX3244E/MAX3245E dual charge pump ensures the transmitters supply at least ±5V during worst-case conditions.Figure 13b shows the transmitter output voltages under increasing load current. Figure 13a shows a typical mouse connection.Interconnection with 3V and 5V LogicThe MAX3224E–MAX3227E/MAX3244E/MAX3245E can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 4 for more informa-tion on possible combinations of interconnections.Table 5 lists other Maxim ESD-powered transceivers.Table 5. ±15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from MaximM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus___________________________________________________Typical Operating CircuitsMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus___________________________________________________________Pin ConfigurationsM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus ___________________________________________Ordering Information (continued)___________________Chip InformationMAX3224E TRANSISTOR COUNT: 1129MAX3225E TRANSISTOR COUNT: 1129MAX3226E TRANSISTOR COUNT: 1129MAX3227E TRANSISTOR COUNT: 1129MAX3244E/MAX3245E TRANSISTOR COUNT: 1335PROCESS: BICMOS*EP = Exposed paddle.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus______________________________________________________________________________________21Package 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 .)。
MAX3232EEAE中文资料
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.
MAX3094EESE中文资料
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at .
元器件交易网
MAX3093E/MAX3094E
_______________Ordering Information
PART MAX3093ECUE MAX3093ECSE MAX3093ECPE MAX3093EEUE MAX3093EESE MAX3093EEPE MAX3094ECUE MAX3094ECSE MAX3094ECPE MAX3094EEUE MAX3094EESE MAX3094EEPE TEMP RANGE 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 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 PIN-PACKAGE 16 TSSOP 16 Narrow SO 16 Plastic DIP 16 TSSOP 16 Narrow SO 16 Plastic DIP 16 TSSOP 16 Narrow SO 16 Plastic DIP 16 TSSOP 16 Narrow SO 16 Plastic DIP
________________________Applications
MAX4445ESE中文资料
元器件交易网
Gain
Gain Error
Gain-Error Drift
Output Voltage Swing
Output Current Drive Power-Supply Rejection Ratio Common-Mode Rejection Ratio Disable Output Resistance EN Logic Low Threshold EN Logic High Threshold EN Logic Input Low Current EN Logic Input High Current
Current to 3.5mA
Applications
Differential-to-Single-Ended Conversion Twisted-Pair to Coaxial Converter High-Speed Instrumentation Amplifier Data Acquisition Medical Instrumentation High-Speed Differential Line Receiver
元器件交易网
MAX4444/MAX4445
Ultra-High Speed, Low-Distortion, Differentialto-Single-Ended Line Receivers with Enable
AC ELECTRICAL CHARACTERISTICS
MAX333A中文资料
OSC IN
MAX333A
15 N.C. 14 NC3 13 COM3 12 NO3 11 IN3 V4 FLYING CAPACITOR LEVEL TRANSLATOR (2-CHANNEL) V3 V3 - V4
DIP/SO/TSSOP
SWITCHES ARE SHOWN WITH LOGIC "0" INPUT N.C. = NOT INTERNALLY CONNECTED
元器件交易网
19-0189; Rev 1; 6/99
Precision, Quad, SPDT, CMOS Analog Switch
_______________General Description
The MAX333A is a precision, quad, single-pole doublethrow (SPDT) analog switch. The four independent switches operate with bipolar supplies ranging from ±4.5V to ±20V, or with a single-ended supply between +10V and +30V. The MAX333A offers low on resistance (less than 35Ω), guaranteed to match within 2Ω between channels and to remain flat over the analog signal range (∆3Ω max). It also offers break-before-make switching (10ns typical), with turn-off times less than 145ns and turn-on times less than 175ns. The MAX333A is ideal for portable operation since quiescent current runs less than 50µA with all inputs high or low. This monolithic, quad switch is fabricated with Maxim’s new improved silicon-gate process. Design improvements guarantee extremely low charge injection (10pC), low power consumption (3.75mW), and electrostatic discharge (ESD) greater than 2000V. Logic inputs are TTL and CMOS compatible and guaranteed over a +0.8V to +2.4V range—regardless of supply voltage. Logic inputs and switched analog signals can range anywhere between the supply voltages without damage.
MAX3483EESA-T中文资料
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.
元器件交易网
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
Ordering Information
PART TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP MAX3483ECSA MAX3483ECPA MAX3483EESA MAX3483EEPA MAX3485ECSA MAX3485ECPA MAX3485EESA MAX3485EEPA
MAX3245EEUI+中文资料
________________General DescriptionThe MAX3224E/MAX3225E/MAX3226E/MAX3227E/MAX3244E/MAX3245E are 3V-powered EIA/TIA-232and V.28/V.24 communications interfaces with automat-ic shutdown/wakeup features, high data-rate capabili-ties, and enhanced electrostatic discharge (ESD)protection. All transmitter outputs and receiver inputs are protected to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge,and ±15kV using the Human Body Model.All devices achieve a 1µA supply current using Maxim’s revolutionary AutoShutdown Plus™ feature. These devices automatically enter a low-power shutdown mode when the RS-232 cable is disconnected or the transmitters of the connected peripherals are inactive,and the UART driving the transmitter inputs is inactive for more than 30 seconds. They turn on again when they sense a valid transition at any transmitter or receiv-er input. AutoShutdown Plus saves power without changes to the existing BIOS or operating system.The MAX3225E/MAX3227E/MAX3245E also feature MegaBaud™ operation, guaranteeing 1Mbps for high-speed applications such as communicating with ISDN modems. The MAX3224E/MAX3226E/MAX3244E guar-antee 250kbps operation. The transceivers have a pro-prietary low-dropout transmitter output stage enabling true RS-232 performance from a +3.0V to +5.5V supply with a dual charge pump. The charge pump requires only four small 0.1µF capacitors for operation from a 3.3V supply. The MAX3224E–MAX3227E feature a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.All devices are available in a space-saving TQFN,SSOP, and TSSOP (MAX3224E/MAX3225E/MAX3244E/MAX3245E) packages.________________________ApplicationsNotebook, Subnotebook, and Palmtop Computers Cellular PhonesBattery-Powered Equipment Hand-Held Equipment Peripherals Printers__Next Generation Device Features♦For Space-Constrained Applications:MAX3228E/MAX3229E: ±15kV ESD-Protected,+2.5V to +5.5V, RS-232 Transceivers in UCSP MAX3222E/MAX3232E/MAX3241E †/MAX3246E:±15kV ESD-Protected, Down to 10nA, +3.0V to +5.5V, Up to 1Mbps, True RS-232 Transceivers (MAX3246E Available in UCSP™)♦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 PinsMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus________________________________________________________________Maxim Integrated Products119-1339; Rev 9; 2/07Ordering Information continued at end of data sheet.*EP = Exposed paddle.†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.AutoShutdown Plus, MegaBaud, and UCSP are trademarks of Maxim Integrated Products, Inc.Ordering InformationFor pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; 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.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, 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 (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)....1666.7mW20-Pin TQFN (derate 21.3mW/°C above +70°C)....1702.1mW 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 (derate 10.9mW/°C above +70°C).......879mW 28-Pin Wide SO (derate 12.5mW/°C above +70°C)............1W 28-Pin SSOP (derate 9.52mW/°C above +70°C).........762mW 28-Pin TSSOP (derate 12.8mW/°C above +70°C).......1026mW 36-Pin TQFN (derate 26.3mW/°C above +70°C)...........2105mW Operating Temperature Ranges MAX32_ _EC_ _.................................................0°C to +70°C MAX32_ _EE_ _................................................-40°C to +85°C MAX32_ _EAA_..............................................-40°C to +125°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10s).................................+300°C Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________3ELECTRICAL CHARACTERISTICS (continued)(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T A = T MIN to T MAX ,unless otherwise noted. Typical values are at T A = +25°C.)M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 4_______________________________________________________________________________________TIMING CHARACTERISTICS—MAX3224E/MAX3226E/MAX3244E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T A = T MIN to T MAX ,unless otherwise noted. Typical values are at T A = +25°C.)TIMING CHARACTERISTICS—MAX3225E/MAX3227E/MAX3245E(V CC = +3V to +5.5V, C1–C4 = 0.1µF, tested at 3.3V ±10%; C 1= 0.047µF, C2–C4 = 0.33µF, tested at 5.0V ±10%; T A = T MIN to T MAX ,unless otherwise noted. Typical values are at T= +25°C.)Note 3:Transmitter skew is measured at the transmitter zero cross points.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________5-6-5-4-3-2-10123456010002000300040005000MAX3224E/MAX3226ETRANSMITTER 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 )246810121416010002000300040005000MAX3224E/MAX3226ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )5101520253035404520001000300040005000MAX3224E/MAX3226E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )-7.50-2.5-5.02.55.07.501000500150020002500MAX3225E/MAX3227ETRANSMITTER 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 )1510520253035404550010005001500200025003000MAX3225E/MAX3227E TRANSMITTER SKEW vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)T R A N S M I T T E R S K E W (n s)807060504030201005001000150020002500MAX3225E/MAX3227ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )2010403060507090801005001000150020002500MAX3225E/MAX3227E OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )20242230282636343238-40020-20406080100MAX3224E–MAX3227E READY TURN-ON TIME vs. TEMPERATURETEMPERATURE (°C)R E A D Y T U R N -O N T I M E (μs )__________________________________________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.)20018016014012010080604020-40020-20406080100MAX3224E–MAX3227E READY TURN-OFF TIME vs. TEMPERATUREM A X 3224-7/44/45E -09TEMPERATURE (°C)R E A D Y T U R N -O F F T I M E (n s )M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 6____________________________________________________________________________________________________________________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.)-6-5-4-3-2-10123456010002000300040005000MAX3244ETRANSMITTER 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 )4286121014010002000300040005000MAX3244ESLEW RATE vs. LOAD CAPACITANCEM A X 3224-7/44/45E -11LOAD CAPACITANCE (pF)S L E W R A T E (V /μs )302010405060020001000300040005000MAX3244EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )-7.50-2.5-5.02.55.07.50800400120016002000MAX3245ETRANSMITTER 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 )2010403060507090801000400800120016002000MAX3245EOPERATING SUPPLY CURRENT vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )201040306050700400800120016002000MAX3245ESLEW RATE vs. LOAD CAPACITANCELOAD CAPACITANCE (pF)S L E W R A T E (V /μs )1510520253035404550100020003000MAX3245E TRANSMITT SKEW vs. LOAD CAPACITANCEM A X 3224-7/44/45E -16LOAD CAPACITANCE (pF)T R A N S M I T T E R S K E W (n s )MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________7M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 8_______________________________________________________________________________________Dual Charge-Pump Voltage ConverterThe MAX3224E–MAX3227E/MAX3244E/MAX3245E’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), over the +3.0V to +5.5V range. The charge pump operates in discontinuous mode: if the output voltages are less than 5.5V, the charge pump ischarge-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.The READY output (MAX3224E–MAX3227E) is low when the charge pumps are disabled in shutdown mode. The READY signal asserts high when V- goes below -4V.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus_______________________________________________________________________________________9RS-232 TransmittersThe transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels.The MAX3224E/MAX3226E/MAX3244E guarantee a 250kbps data rate (1Mbps, for the MAX3225E/MAX3227E/MAX3245E) with worst-case loads of 3k Ωin parallel with 1000pF, providing compatibility with PC-to-PC com-munication software (such as LapLink™). Transmitters can be paralleled to drive multiple receivers. Figure 1shows a complete system connection.When FORCEOFF is driven to ground or when the Auto-Shutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30s, the transmitters are disabled and the outputs go into a high-impedance state. When powered off or shut down, the outputs can be driven to ±12V. The transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V CC .Figure 1. Interface Under Control of PMUFigure 2. The MAX3244E/MAX3245E detect RS-232 activity when the UART and interface are shut down.LapLink is a trademark of Traveling Software.M A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus 10______________________________________________________________________________________RS-232 ReceiversThe receivers convert RS-232 signals to CMOS-logic output levels. The MAX3224E–MAX3227E feature inverting outputs that always remain active (Table 1).The MAX3244E/MAX3245E have inverting three-state outputs that are high impedance when shut down (FORCEOFF = GND) (Table 1).The MAX3244E/MAX3245E feature an extra, always active, noninverting output, R2OUTB. R2OUTB output monitors receiver activity while the other receivers are high impedance, allowing ring indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for sys-tems where V CC is set to ground in shutdown to accommodate peripherals such as UARTs (Figure 2).The MAX3224E–MAX3227E/MAX3244E/MAX3245E fea-ture an INVALID output that is enabled low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiv-er input’s condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4).AutoShutdown Plus ModeThe MAX3224E–MAX3227E/MAX3244E/MAX3245E achieve a 1µA supplycurrent with Maxim’s AutoShutdown Plus feature, which operates when FORCEOFF is high and a FORCEON is low. When these devices do not sense a valid signal transition on any receiver and trans-mitter input for 30s, the on-board charge pumps are shut down, reducing supply current to 1µA. This occurs if the RS-232 cable is disconnected or if the connectedTable 1. Output Control Truth TableX = Don’t care*INVALID connected to FORCEON**INVALID connected to FORCEON and FORCEOFFMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plusperipheral transmitters are turned off, and the UART dri-ving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the sys-tem saves power without changes to the existing BIOS or operating system.Figures 3a and 3b depict valid and invalid RS-232receiver voltage levels. INVALID indicates the receiver input’s condition, and is independent of FORCEON and FORCEOFF states. Figure 3 and Tables 1 and 2 sum-marize the operating modes of the MAX3224E–MAX3227E/MAX3244E/MAX3245E. FORCEON and FORCEOFF override AutoShutdown Plus circuitry.When neither control is asserted, the IC selects between these states automatically based on the last receiver or transmitter input edge received.When shut down, the device’s charge pumps turn off,V+ is pulled to V CC , V- is pulled to ground, the transmit-ter outputs are high impedance, and READY (MAX3224E–MAX3227E) is driven low. The time required to exit shutdown is typically 100µs (Figure 8).By connecting FORCEON to INVALID , the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level and no receiver or transmitter edge is detected for 30s, and wake up when a valid receiver level or receiver or transmitter edge is detected.Figure 3a. INVALID Functional Diagram, INVALID Low Figure 3b. INVALID Functional Diagram, INVALID HighFigure 3c. AutoShutdown Plus LogicFigure 3d. Power-Down LogicFigure 4a. Receiver Positive/Negative Thresholds for INVALIDM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusBy connecting FORCEON and FORCEOFF to INVALID ,the MAX3224E–MAX3227E/MAX3244E/MAX3245E shut down when no valid receiver level is detected and wake up when a valid receiver level is detected (same functionality as AutoShutdown feature on MAX3221E/MAX3223E/MAX3243E).A mouse or other system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3244E/MAX3245E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232ports on both systems remain enabled.Software-Controlled ShutdownIf direct software control is desired, use INVALID to indicate DTR or ring indicator signal. Tie FORCEOFF and FORCEON together to bypass the AutoShutdown Plus so the line acts like a SHDN input.±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostaticdischarges encountered during handling and assembly.The driver outputs and receiver inputs of the MAX3224E–MAX3227E/MAX3244E/MAX3245E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protectFigure 4b. AutoShutdown Plus, INVALID,and READY Timing DiagramFigure 5. AutoShutdown Plus Initial Turn-On to Wake Up a Mouse or Another SystemMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plusthese 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.ESD protection can be tested in various ways; the transmitter outputs and receiver inputs of this product family are characterized for protection to the following limits:1)±15kV using the Human Body Model2)±8kV using the Contact-Discharge Method specified in IEC1000-4-23)±15kV using IEC1000-4-2’s Air-Gap Method.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 6a shows the Human Body Model and Figure 6b 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 inter-est, which is then discharged into the test device through a 1.5k Ωresistor.Figure 6b. Human Body Current WaveformFigure 7b. IEC1000-4-2 ESD Generator Current WaveformFigure 6a. Human Body ESD Test Model Figure 7a. IEC1000-4-2 ESD Test ModelM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus IEC1000-4-2The IEC1000-4-2 standard covers ESD testing and per-formance of finished equipment; it does not specifically refer to integrated circuits. The MAX3224E–MAX3227E,MAX3244E/MAX3245E help you design equipment that meets Level 4 (the highest level) of IEC1000-4-2, with-out the need for additional ESD-protection components.The major difference between tests done using the H uman Body Model and IEC1000-4-2 is higher peak current in IEC1000-4-2, because series resistance is lower in the IEC1000-4-2 model. Hence, the ESD with-stand voltage measured to IEC1000-4-2 is generally lower than that measured using the H uman Body Model. Figure 7a shows the IEC1000-4-2 model and Figure 7b shows the current waveform for the 8kV,IEC1000-4-2, Level 4, ESD Contact-Discharge Method.The Air-Gap Method 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. Of course, all pins require this protec-tion during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.__________Applications InformationCapacitor SelectionThe capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitorscan be used. The charge pump requires 0.1µF capaci-tors for 3.3V operation. For other supply voltages, see Table 3 for required capacitor values. Do not use val-ues smaller than those listed in Table 3. 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 degrade excessively 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 that are sensitive to power-supply noise, use a capacitor of the same value as charge-pump capacitor C1. Connect bypass capaci-tors as close to the IC as possible.Transmitter Outputs when Exiting ShutdownFigure 8 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). Each5μs/divV CC = 3.3V C1–C4 = 0.1μFFigure 8. Transmitter Outputs when Exiting Shutdown or Powering Uptransmitter is loaded with 3k Ωin parallel with 1000pF.The transmitter outputs display no ringing or undesir-able transients as they come out of shutdown. Note that the transmitters are enabled only when the magnitude of V- exceeds approximately -3V.High Data RatesThe MAX3224E/MAX3226E/MAX3244E maintain the RS-232 ±5.0V minimum transmitter output voltage even at high data rates. Figure 9 shows a transmitter loop-back test circuit. Figure 10 shows a loopback test result at 120kbps, and Figure 11 shows the same test at 250kbps. For Figure 10, all transmitters were driven simultaneously at 120kbps into RS-232 loads in parallel with 1000pF. For Figure 11, a single transmitter was dri-ven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 250pF.The MAX3225E/MAX3227E/MAX3245E maintain the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps (MegaBaud). Figure 12 shows a loopback test result with a single transmitter driven at 1Mbps and all transmitters loaded with an RS-232receiver in parallel with 250pF.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusFigure 9. Loopback Test CircuitFigure 10. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 120kbps2μs/divV CC = 3.3VFigure 11. MAX3224E/MAX3226E/MAX3244E Loopback Test Result at 250kbps2μs/divV CC = 3.3VFigure 12. MAX3225E/MAX3227E/MAX3245E Loopback Test Result at 1Mbps200ns/div5V/div5V/div5V/divV CC = 3.3VM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus Figure 13a. Mouse Driver Test CircuitMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown PlusMouse DriveabilityThe MAX3244E/MAX3245E are specifically designed to power serial mice while operating from low-voltage power supplies. They have been tested with leading mouse brands from manufacturers such as Microsoft and Logitech. The MAX3244E/MAX3245E successfully drove all serial mice tested and met their respective current and voltage requirements. The MAX3244E/MAX3245E dual charge pump ensures the transmitters supply at least ±5V during worst-case conditions.Figure 13b shows the transmitter output voltages under increasing load current. Figure 13a shows a typical mouse connection.Interconnection with 3V and 5V LogicThe MAX3224E–MAX3227E/MAX3244E/MAX3245E can directly interface with various 5V logic families, includ-ing ACT and HCT CMOS. See Table 4 for more informa-tion on possible combinations of interconnections.Table 5 lists other Maxim ESD-powered transceivers.Table 5. ±15kV ESD-Protected, 3.0V to 5.5V Powered RS-232 Transceivers from MaximM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus___________________________________________________Typical Operating CircuitsMAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus___________________________________________________________Pin ConfigurationsM A X 3224E –M A X 3227E /M A X 3244E /M A X 3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus ___________________________________________Ordering Information (continued)___________________Chip InformationMAX3224E TRANSISTOR COUNT: 1129MAX3225E TRANSISTOR COUNT: 1129MAX3226E TRANSISTOR COUNT: 1129MAX3227E TRANSISTOR COUNT: 1129MAX3244E/MAX3245E TRANSISTOR COUNT: 1335PROCESS: BICMOS*EP = Exposed paddle.MAX3224E–MAX3227E/MAX3244E/MAX3245E †±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V ,RS-232 Transceivers with AutoShutdown Plus______________________________________________________________________________________21Package 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 .)。
max485esa中文资料
General DescriptionThe MAX481, MAX483, MAX485, MAX487–MAX491, andMAX1487 are low-power transceivers for RS-485 and RS-422 communication. Each part contains one driver and onereceiver. The MAX483, MAX487, MAX488, and MAX489feature reduced slew-rate drivers that minimize E MI andreduce reflections caused by improperly terminated cables,thus allowing error-free data transmission up to 250kbps.The driver slew rates of the MAX481, MAX485, MAX490,MAX491, and MAX1487 are not limited, allowing them totransmit up to 2.5Mbps.These transceivers draw between 120µA and 500µA ofsupply current when unloaded or fully loaded with disableddrivers. Additionally, the MAX481, MAX483, and MAX487have a low-current shutdown mode in which they consumeonly 0.1µA. All parts operate from a single 5V supply.Drivers are short-circuit current limited and are protectedagainst excessive power dissipation by thermal shutdowncircuitry that places the driver outputs into a high-imped-ance state. The receiver input has a fail-safe feature thatguarantees a logic-high output if the input is open circuit.The MAX487 and MAX1487 feature quarter-unit-loadreceiver input impedance, allowing up to 128 MAX487/MAX1487 transceivers on the bus. Full-duplex communi-cations are obtained using the MAX488–MAX491, whilethe MAX481, MAX483, MAX485, MAX487, and MAX1487are designed for half-duplex applications.________________________Applications Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers Level Translators Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks__Next Generation Device Features o For Fault-Tolerant Applications MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4Unit Load, +3.3V, RS-485 Transceiver MAX3440E–MAX3444E: ±15kV ESD-Protected,±60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers o For Space-Constrained Applications MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,Profibus RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Speed, RS-485/RS-422Transceiver in a SOT23 Package MAX3280E–MAX3284E: ±15kV ESD-Protected,52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,True Fail-Safe Receivers MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,SOT23, RS-485/RS-422 Transmitters o For Multiple Transceiver Applications MAX3030E–MAX3033E: ±15kV ESD-Protected,+3.3V, Quad RS-422 Transmitters o For Fail-Safe Applications MAX3080–MAX3089: Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422Transceiverso For Low-Voltage ApplicationsMAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E: +3.3V Powered, ±15kVESD-Protected, 12Mbps, Slew-Rate-Limited,True RS-485/RS-422 Transceivers For pricing, delivery, and ordering information, please contact Maxim Direct at1-888-629-4642, or visit Maxim Integrated’s website at .______________________________________________________________Selection Table19-0122; Rev 10; 9/14PARTNUMBERHALF/FULL DUPLEX DATA RATE (Mbps) SLEW-RATE LIMITED LOW-POWER SHUTDOWN RECEIVER/DRIVER ENABLE QUIESCENT CURRENT (μA) NUMBER OF RECEIVERS ON BUS PIN COUNT MAX481Half 2.5No Yes Yes 300328MAX483Half 0.25Yes Yes Yes 120328MAX485Half 2.5No No Yes 300328MAX487Half 0.25Yes Yes Yes 1201288MAX488Full 0.25Yes No No 120328MAX489Full 0.25Yes No Yes 1203214MAX490Full 2.5No No No 300328MAX491Full 2.5No No Yes 3003214MAX1487 Half 2.5No No Yes 2301288Ordering Information appears at end of data sheet.找电子元器件上宇航军工MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487Low-Power, Slew-Rate-LimitedRS-485/RS-422 TransceiversPackage Information For the latest package outline information and land patterns, go to . Note that a “+”, “#”, or “-”in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.16Low-Power, Slew-Rate-Limited RS-485/RS-422 TransceiversMAX481/MAX483/MAX485/MAX487–MAX491/MAX1487Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-100017©2014 Maxim Integrated Products, Inc.Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.。
MAX3373EEKA+中文资料
General DescriptionThe MAX3372E–MAX3379E and MAX3390E–MAX3393E ±15kV ESD-protected level translators provide the level shifting necessary to allow data transfer in a multivoltage system. Externally applied voltages, V CC and V L , set the logic levels on either side of the device. A low-voltage logic signal present on the V L side of the device appears as a high-voltage logic signal on the V CC side of the device, and vice-versa. The MAX3374E/MAX3375E/MAX3376E/MAX3379E and MAX3390E–MAX3393E unidi-rectional level translators level shift data in one direction (V L →V CC or V CC →V L ) on any single data line. The MAX3372E/MAX3373E and MAX3377E/MAX3378E bidi-rectional level translators utilize a transmission-gate-based design (Figure 2) to allow data translation in either direction (V L ↔V CC ) on any single data line. The MAX3372E–MAX3379E and MAX3390E–MAX3393E accept V L from +1.2V to +5.5V and V CC from +1.65V to +5.5V, making them ideal for data transfer between low-voltage ASICs/PLDs and higher voltage systems.All devices in the MAX3372E –MAX3379E , MAX3390E –MAX3393E family feature a three-state output mode that reduces supply current to less than 1µA, thermal short-circuit protection, and ±15kV ESD protection on the V CC side for greater protection in applications that route sig-nals externally. The MAX3372E /MAX3377E operate at a guaranteed data rate of 230kbps. Slew-rate limiting reduces E MI emissions in all 230kbps devices. The MAX3373E –MAX3376E /MAX3378E /MAX3379E and MAX3390E–MAX3393E operate at a guaranteed data rate of 8Mbps over the entire specified operating voltage range. Within specific voltage domains, higher data rates are possible. (See the Timing Characteristics table.)The MAX3372E –MAX3376E are dual level shifters available in 3 x 3 UCSP™, 8-pin TDFN, and 8-pin SOT23-8 packages. The MAX3377E /MAX3378E /MAX3379E and MAX3390E–MAX3393E are quad level shifters available in 3 x 4 UCSP, 14-pin TDFN, and 14-pin TSSOP packages.________________________ApplicationsSPI™, MICROWIRE™, and I 2C Level TranslationLow-Voltage ASIC Level Translation Smart Card Readers Cell-Phone Cradles Portable POS SystemsPortable Communication Devices Low-Cost Serial Interfaces Cell Phones GPSTelecommunications EquipmentFeatures♦Guaranteed Data Rate Options230kbps8Mbps (+1.2V ≤V L ≤V CC ≤+5.5V)10Mbps (+1.2V ≤V L ≤V CC ≤+3.3V)16Mbps (+1.8V ≤V L ≤V CC ≤+2.5V and +2.5V ≤V L ≤V CC ≤+3.3V)♦Bidirectional Level Translation (MAX3372E/MAX3373E and MAX3377E/MAX3378E)♦Operation Down to +1.2V on V L♦±15kV ESD Protection on I/O V CC Lines ♦Ultra-Low 1µA Supply Current in Three-State Output Mode♦Low-Quiescent Current (130µA typ)♦UCSP, TDFN, SOT23, and TSSOP Packages ♦Thermal Short-Circuit ProtectionMAX3372E–MAX3379E/MAX3390E–MAX3393E±15kV ESD-Protected, 1µA, 16Mbps, Dual/QuadLow-Voltage Level Translators in UCSP________________________________________________________________Maxim Integrated Products119-2328; Rev 2; 11/07For pricing, delivery, and ordering information,please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .Ordering InformationUCSP is a trademark of Maxim Integrated Products, Inc.SPI is a trademark of Motorola, Inc.MICROWIRE is a trademark of National Semiconductor Corp.Ordering Information continued at end of data sheet.Selector Guide appears at end of data sheet.+Denotes a lead-free package.T = Tape and reel.M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICSStresses 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.(All voltages referenced to GND.)V CC ...........................................................................-0.3V to +6V I/O V CC_......................................................-0.3V to (V CC + 0.3V)I/O V L_...........................................................-0.3V to (V L + 0.3V)THREE-STATE ...............................................-0.3V to (V L + 0.3V)Short-Circuit Duration I/O V L , I/O V CC to GND...........Continuous Short-Circuit Duration I/O V L or I/O V CC to GND Driven from 40mA Source(except MAX3372E and MAX3377E).....................ContinuousContinuous Power Dissipation (T A = +70°C)8-Pin SOT23 (derate 8.9mW/°C above +70°C)...........714mW 8-Pin TDFN (derate 18.2mW/°C above +70°C)........1455mW 3 x 3 UCSP (derate 4.7mW/°C above +70°C)............379mW 3 x 4 UCSP (derate 6.5mW/°C above +70°C)............579mW 14-Pin TSSOP (derate 9.1mW/°C above +70°C)........727mW 14-Pin TDFN (derate 18.2mW/°C above +70°C)......1454mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CELECTRICAL CHARACTERISTICS (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSP(V CC= +1.65V to +5.5V, V L= +1.2V to (V CC+ 0.3V), GND = 0, I/O V L_and I/O V CC_unconnected, T A= T MIN to T MAX, unless other-M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP 4_______________________________________________________________________________________TIMING CHARACTERISTICS(V CC = +1.65V to +5.5V, V L = +1.2V to (V CC + 0.3V), GND = 0, R LOAD = 1M Ω, I/O test signal of Figure 1, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +3.3V, V L = +1.8V, T A = +25°C, unless otherwise noted.) (Notes 1, 2)MAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSP_______________________________________________________________________________________5and not production tested.Note 2:For normal operation, ensure V L < (V CC + 0.3V). During power-up, V L > (V CC + 0.3V) will not damage the device. Note 3:To ensure maximum ESD protection, place a 1µF capacitor between V CC and GND. See Applications Circuits .Note 4:10% to 90% Note 5:90% to 10%TIMING CHARACTERISTICS (continued)(V = +1.65V to +5.5V, V = +1.2V to (V + 0.3V), GND = 0, R = 1M Ω, I/O test signal of Figure 1, T = T to T , unlessM A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP 6_______________________________________________________________________________________Typical Operating Characteristics(R LOAD = 1M Ω, T A = +25°C, unless otherwise noted. All 230kbps TOCs apply to MAX3372E/MAX3377E only. All 8Mbps and 500kbps TOCs apply to MAX3373E–MAX3376E/MAX3378E/MAX3379E and MAX3390E–MAX3393E only.)V L SUPPLY CURRENT vs. SUPPLY VOLTAGE (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)V CC (V)S U P P L Y C U R R E N T (μA )4.954.403.853.302.752.2010020030040050060001.655.50V CC SUPPLY CURRENT vs. SUPPLY VOLTAGE (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)V CC (V)S U P P L Y C U R R E N T (m A )4.954.403.853.302.752.200.51.01.52.02.53.03.501.65 5.50V L SUPPLY CURRENT vs. TEMPERATURE (DRIVING I/O V CC , V CC = +3.3V, V L = +1.8V)TEMPERATURE (°C)S U P P L Y C U R R E N T (μA )6035-151050100150200250300350400-4085V CC SUPPLY CURRENT vs. TEMPERATURE(DRIVING I/O V CC , V CC = +3.3V, V L = +1.8V)TEMPERATURE (°C)S U P P L Y C U R R E N T (μA )6035-151020040060080010001200140016000-4085V L SUPPLY CURRENT vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L= +1.8V)CAPACITIVE LOAD (pF)S U P P L Y C U R R E N T (μA )857055402550100150200250300350010100V CC SUPPLY CURRENT vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)S U P P L Y C U R R E N T (μA )8570554025500100015002000250010100RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )908070605040305001000150020002500020100RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )454030352025152468101214161801050RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )454035302520155010015020025001050MAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSP_______________________________________________________________________________________7PROPAGATION DELAY vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)P R O P A G A T I O N D E L A Y (n s )90807060504030100200300400500600700020100PROPAGATION DELAY vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)P R O P A G A T I O N D E L A Y (n s )4540353025201536912151050PROPAGATION DELAY vs. CAPACITIVE LOAD (DRIVING I/O V L , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)P R O P A G A T I O N D E L A Y (n s )454035302520155010015020025030001050RISE/FALL TIME vs. CAPACITIVE LOAD(DRIVING I/O V L , V CC = +2.5V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )908070605040305001000150020002500020100RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O VL , V CC = +2.5V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )4540353025201524681012141050RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +2.5V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )45403530252015501001502002503001050RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC , VCC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )908070605040305001000150020002500020100RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC, V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )454035302520152468101201050RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )454035302520155010015020025030001050Typical Operating Characteristics (continued)(R LOAD = 1M Ω, T A = +25°C, unless otherwise noted. All 230kbps TOCs apply to MAX3372E/MAX3377E only. All 8Mbps and 500kbps TOCs apply to MAX3373E–MAX3376E/MAX3378E/MAX3379E and MAX3390E–MAX3393E only.)M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP 8_______________________________________________________________________________________Typical Operating Characteristics (continued)(R LOAD = 1M Ω, T A = +25°C, unless otherwise noted. All 230kbps TOCs apply to MAX3372E/MAX3377E only. All 8Mbps and 500kbps TOCs apply to MAX3373E–MAX3376E/MAX3378E/MAX3379E and MAX3390E–MAX3393E only.)PROPAGATION DELAY vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)P R O P A G A T I O N D E L A Y (n s )90807060504030100200300400500600700020100PROPAGATION DELAY vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)P R O P A G A T I O N D E L A Y (n s )4540353025201512345601050PROPAGATION DELAY vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +3.3V, V L = +1.8V)CAPACITIVE LOAD (pF)P R O P A G A T I O N D E L A Y (n s )454035302520155010015020025030001050RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +2.5V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )908070605040305001000150020002500020100RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +2.5V, V L = +1.8V)CAPACITIVE LOAD (pF)R I S E /F A L L T I M E (n s )403020246810121050RISE/FALL TIME vs. CAPACITIVE LOAD (DRIVING I/O V CC , V CC = +2.5V, V L = +1.8V)CAPACITIVE LOAD (pF)RI S E /F A L l T I M E (n s )403020501001502002503003501050RAIL-TO-RAIL DRIVING(DRIVING I/O V L , V CC = +3.3V, V L = +1.8V,C LOAD = 50pF, DATA RATE = 230kbps)M A X 3372E t o c 25I/O V L_I/O V CC_1V/div 2V/div 1μs/div RAIL-TO-RAIL DRIVING(DRIVING I/O V L , V CC = +3.3V, V L = +1.8V,C LOAD = 15pF, DATA RATE = 8Mbps)M A X 3372E t o c 26I/O V L_I/O V CC_1V/div2V/div200ns/divMAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSP_______________________________________________________________________________________9Typical Operating Characteristics (continued)(R LOAD = 1M Ω, T A = +25°C, unless otherwise noted. All 230kbps TOCs apply to MAX3372E/MAX3377E only. All 8Mbps and 500kbps TOCs apply to MAX3373E–MAX3376E/MAX3378E/MAX3379E and MAX3390E–MAX3393E only.)EXITING THREE-STATE OUTPUT MODE (V CC = +3.3V, V L = +1.8V, C LOAD = 50pF)MAX3372E toc28I/O V L_I/O V CC_2μs/divTHREE-STATE2V/div1V/div1V/divPin DescriptionOPEN-DRAIN DRIVING(DRIVING I/O V L , V CC = +3.3V, V L = +1.8V,C LOAD = 15pF, DATA RATE = 500kbps)M A X 3372E t o c 27I/O V L_I/O V CC_1V/div2V/div200ns/divM A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP 10______________________________________________________________________________________Detailed DescriptionThe MAX3372E –MAX3379E and MAX3390E –MAX3393E E SD-protected level translators provide the level shifting necessary to allow data transfer in a multivoltage system.Externally applied voltages, V CC and V L , set the logic lev-els on either side of the device. A low-voltage logic signal present on the V L side of the device appears as a high-voltage logic signal on the V CC side of the device, and vice-versa. The MAX3374E /MAX3375E /MAX3376E /MAX3379E and MAX3390E –MAX3393E unidirectional level translators level shift data in one direction (V L →V CC or V CC →V L ) on any single data line. The MAX3372E /MAX3373E and MAX3377E /MAX3378E bidi-rectional level translators utilize a transmission-gate-based design (see Figure 2) to allow data translation in either direction (V L ↔V CC ) on any single data line. The MAX3372E –MAX3379E and MAX3390E –MAX3393Eaccept V L from +1.2V to +5.5V and V CC from +1.65V to +5.5V, making them ideal for data transfer between low-voltage ASICs/PLDs and higher voltage systems.All devices in the MAX3372E –MAX3379E , MAX3390E –MAX3393E family feature a three-state output mode that reduces supply current to less than 1µA, thermal short-circuit protection, and ±15kV ESD protection on the V CC side for greater protection in applications that route sig-nals externally. The MAX3372E /MAX3377E operate at a guaranteed data rate of 230kbps. Slew-rate limiting reduces E MI emissions in all 230kbps devices. The MAX3373E –MAX3376E /MAX3378E /MAX3379E and MAX3390E–MAX3393E operate at a guaranteed data rate of 8Mbps over the entire specified operating voltage range. Within specific voltage domains, higher data rates are possible. (See the Timing Characteristics table.)Figure 1a. Rail-to-Rail Driving I/O V LFigure 1b. Rail-to-Rail Driving I/O V CCMAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSPLevel TranslationFor proper operation ensure that +1.65V ≤V CC ≤+5.5V, +1.2V ≤V L ≤+5.5V, and V L ≤(V CC + 0.3V).During power-up sequencing, V L ≥(V CC + 0.3V) will not damage the device. During power-supply sequenc-ing, when V CC is floating and V L is powering up, a cur-rent may be sourced, yet the device will not latch up.The speed-up circuitry limits the maximum data rate for devices in the MAX3372E –MAX3379E , MAX3390E –MAX3393E family to 16Mbps. The maximum data rate also depends heavily on the load capacitance (see the Typical Operating Characteristics ), output impedance of the driver, and the operational voltage range (see the Timing Characteristics table).Speed-Up CircuitryThe MAX3373E –MAX3376E /MAX3378E /MAX3379E and MAX3390E–MAX3393E feature a one-shot generator that decreases the rise time of the output. When triggered,MOSFETs PU1 and PU2 turn on for a short time to pull upI/O V L_and I/O V CC_to their respective supplies (see Figure 2b). This greatly reduces the rise time and propa-gation delay for the low-to-high transition. The scope photo of Rail-to-Rail Driving for 8Mbps Operation in the Typical Operating Characteristics shows the speed-up circuitry in operation.Rise-Time AcceleratorsThe MAX3373E–MAX3376E/MAX3378E/MAX3379E and the MAX3390E –MAX3393E have internal rise-time accelerators allowing operation up to 16Mbps. The rise-time accelerators are present on both sides of the device and act to speed up the rise time of the input and output of the device, regardless of the direction of the data. The triggering mechanism for these accelera-tors is both level and edge sensitive. To prevent false triggering of the rise-time accelerators, signal fall times of less than 20ns/V are recommended for both the inputs and outputs of the device. Under less noisy con-ditions, longer signal fall times may be acceptable.Figure 1c. Open-Drain Driving I/O V CCFigure 1d. Open-Drain Driving I/O V LM A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP Three-State Output ModePull THREE-STATE low to place the MAX3372E –MAX3379E and MAX3390E–MAX3393E in three-state out-put mode. Connect THREE-STATE to V L (logic-high) for normal operation. Activating the three-state output mode disconnects the internal 10k Ωpullup resistors on the I/O V CC and I/O V L lines. This forces the I/O lines to a high-impedance state, and decreases the supply current to less than 1µA. The high-impedance I/O lines in three-state output mode allow for use in a multidrop network.When in three-state output mode, do not allow the voltageat I/O V L_to exceed (V L + 0.3V), or the voltage at I/O V CC_to exceed (V CC + 0.3V).Thermal Short-Circuit ProtectionThermal overload detection protects the MAX3372E –MAX3379E and MAX3390E–MAX3393E from short-circuit fault conditions. In the event of a short-circuit fault, when the junction temperature (T J ) reaches +152°C, a thermal sensor signals the three-state output mode logic to force the device into three-state output mode. When T J has cooled to +142°C, normal operation resumes.Figure 2a. Functional Diagram, MAX3372E/MAX3377E (1 I/O line)Figure 2b. Functional Diagram, MAX3373E/MAX3378E (1 I/O line)±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The I/O V CC lines have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against E SD of ±15kV without damage. The E SD structures withstand high E SD in all states: normal operation, three-state output mode, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing products can latch and must be powered down to remove latchup.ESD protection can be tested in various ways. The I/O V CC lines of this product family are characterized for protection to the following limits:1)±15kV using the Human Body Model2)±8kV using the Contact Discharge method specifiedin IEC 1000-4-23)±10kV using IE C 1000-4-2’s Air-Gap DischargemethodESD Test Conditions E SD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.Human Body Model Figure 3a shows the Human Body Model and Figure 3b 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 inter-est, which is then discharged into the test device through a 1.5kΩresistor.IEC 1000-4-2 The IE C 1000-4-2 standard covers E SD testing and performance of finished equipment; it does not specifi-cally refer to integrated circuits. The MAX3372E–MAX3379E and MAX3390E–MAX3393E help to design equipment that meets Level 3 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 IE C 1000-4-2 is higher peak current in IE C 1000-4-2, because series resistance is lower in the IE C 1000-4-2 model. Hence, the E SD with-stand voltage measured to IE C 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 4a shows the IEC 1000-4-2 model, and Figure 4b shows the current waveform for the ±8kV, IEC 1000-4-2, Level 4, ESD contact-discharge test.The air-gap test involves approaching the device with a charged probe. The contact-discharge method con-nects the probe to the device before the probe is energized.Machine Model The Machine Model for E SD 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. Of course, all pins require this protec-tion during manufacturing, not just inputs and outputs. Therefore, after PCB assembly, the Machine Model is less relevant to I/O ports.MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSPFigure 3a. Human Body ESD Test ModelFigure 3b. Human Body Current WaveformM A X 3372E –M A X 3379E /M A X 3390E –M A X 3393EApplications InformationPower-Supply DecouplingTo reduce ripple and the chance of transmitting incor-rect data, bypass V L and V CC to ground with a 0.1µF capacitor. See the Typical Operating Circuit. To ensure full ±15kV ESD protection, bypass V CC to ground with a 1µF capacitor. Place all capacitors as close to the power-supply inputs as possible.I 2C Level TranslationThe MAX3373E –MAX3376E , MAX3378E /MAX3379E and MAX3390E–MAX3393E level-shift the data present on the I/O lines between +1.2V and +5.5V, making them ideal for level translation between a low-voltageASIC and an I 2C device. A typical application involves interfacing a low-voltage microprocessor to a 3V or 5V D/A converter, such as the MAX517.Push-Pull vs. Open-Drain DrivingAll devices in the MAX3372E –MAX3379E and MAX3390E–MAX3393E family may be driven in a push-pull configuration. The MAX3373E –MAX3376E /MAX3378E /MAX3379E and MAX3390E –MAX3393E include internal 10k Ωresistors that pull up I/O V L_and I/O V CC_to their respective power supplies, allowing operation of the I/O lines with open-drain devices. See the Timing Characteristics table for maximum data rates when using open-drain drivers.Low-Voltage Level Translators in UCSPFigure 4b. IEC 1000-4-2 ESD Generator Current WaveformFigure 4a. IEC 1000-4-2 ESD Test Model Typical Operating CircuitMAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSPApplications CircuitsM A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP Applications Circuits (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSP Applications Circuits (continued)M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSPApplications Circuits (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSPApplications Circuits (continued)M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSP Selector Guide*Higher data rates are possible (see the Timing Characteristics table).Ordering Information (continued)+Denotes a lead-free package.**EP = Exposed pad.T = Tape and reel.Ordering Information (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSP**EP = Exposed pad.T = Tape and reel.†Future product—contact factory for availability.M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSPPin Configurations (continued)Pin Configurations (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSPM A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSPPin Configurations (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393ELow-Voltage Level Translators in UCSPChip InformationTRANSISTOR COUNT:MAX3372E–MAX3376E: 189MAX3377E–MAX3379E, MAX3390E–MAX3393E:295PROCESS: BiCMOSPackage 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 .)M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSPPackage Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)Package Information (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSP (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to /packages.)M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSPPackage Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)Package Information (continued)MAX3372E–MAX3379E/MAX3390E–MAX3393E Low-Voltage Level Translators in UCSP (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline informationgo to /packages.)Package Information (continued)(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to /packages .)M A X 3372E –M A X 3379E /M A X 3390E –M A X 3393ELow-Voltage Level Translators in UCSPMAX3372E–MAX3379E/MAX3390E–MAX3393E ±15kV ESD-Protected, 1µA, 16Mbps, Dual/Quad Low-Voltage Level Translators in UCSPMaxim 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 ____________________31©2007 Maxim Integrated Productsis a registered trademark of Maxim Integrated Products, Inc.Revision History元器件交易网。
MAX4444中文资料
Features
o 5000V/µs Slew Rate (MAX4444) o +2V/V Internally Fixed Gain (MAX4444) o External Gain Selection
(MAX4445, AVCL ≥ +2V/V) o 550MHz -3dB Bandwidth o -60dB SFDR at 5MHz o Low Differential Gain/Phase: 0.07%/0.05° o Low Noise: 25nV/√Hz at fIN = 100kHz o Low-Power Disable Mode Reduces Quiescent
10
55
0.25
45
82
170
2
(1 + 600/RG)
0.5
2
2.6
8
0.003
±3.4 ±3.7
±3.3 ±3.6
90
120
53
70
40
55
1.8
0.8
2
2.2
10
2.6
10
41
55
3.5
5.5
MAX3443EASA+中文资料
General DescriptionThe MAX3440E–MAX3444E fault-protected RS-485 and J1708 transceivers feature ±60V protection from signal faults on communication bus lines. Each device contains one differential line driver with three-state output and one differential line receiver with three-state input. The 1/4-unit-load receiver input impedance allows up to 128 trans-ceivers on a single bus. The devices operate from a 5V supply at data rates of up to 10Mbps. True fail-safe inputs guarantee a logic-high receiver output when the receiver inputs are open, shorted, or connected to an idle data line.Hot-swap circuitry eliminates false transitions on the data bus during circuit initialization or connection to a live backplane. Short-circuit current-limiting and ther-mal shutdown circuitry protect the driver against exces-sive power dissipation, and on-chip ±15kV ESD protection eliminates costly external protection devices.The MAX3440E–MAX3444E are available in 8-pin SO and PDIP packages and are specified over industrial and automotive temperature ranges.ApplicationsRS-422/RS-485 Communications Truck and Trailer Applications Industrial NetworksTelecommunications Systems Automotive Applications Features♦±15kV ESD Protection ♦±60V Fault Protection♦Guaranteed 10Mbps Data Rate (MAX3441E/MAX3443E)♦Hot Swappable for Telecom Applications ♦True Fail-Safe Receiver Inputs♦Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission(MAX3440E/MAX3442E/MAX3444E)♦Allow Up to 128 Transceivers on the Bus ♦-7V to +12V Common-Mode Input Range♦Automotive Temperature Range (-40°C to +125°C)♦Industry-Standard PinoutMAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers________________________________________________________________Maxim Integrated Products 1Pin Configurations and Typical Operating CircuitsOrdering Information19-2666; Rev 1; 12/05For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .Ordering Information continued at end of data sheet.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses 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.Voltages Referenced to GNDV CC ........................................................................................+7V FAULT, DE/RE, RE , DE, DE , DI, TXD..........-0.3V to (V CC + 0.3V)A, B (Note 1)........................................................................±60V RO..............................................................-0.3V to (V CC + 0.3V)Short-Circuit Duration (RO, A, B)...............................Continuous Continuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW 8-Pin PDIP (derate 9.09mW/°C above +70°C).............727mWOperating Temperature RangesMAX344_EE_ _...............................................-40°C to +85°C MAX344_EA_ _.............................................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s).................................+300°CDC ELECTRICAL CHARACTERISTICSNote 1:A, B must be terminated with 54Ωor 100Ωto guarantee ±60V fault protection.MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 TransceiversDC ELECTRICAL CHARACTERISTICS (continued)(V = +4.75V to +5.25V, T = T to T , unless otherwise noted. Typical values are at V = +5V and T = +25°C.)M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 4_______________________________________________________________________________________SWITCHING CHARACTERISTICS (MAX3440E/MAX3442E/MAX3444E)MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers_______________________________________________________________________________________5SWITCHING CHARACTERISTICS (MAX3441E/MAX3443E)(V CC = +4.75V to +5.25V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5V and T A = +25°C.)Note 3:The short-circuit output current applies to peak current just before foldback current limiting; the short-circuit foldback outputcurrent applies during current limiting to allow a recovery from bus contention.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 6_______________________________________________________________________________________RECEIVER OUTPUT CURRENT vs. OUTPUT LOW VOLTAGEM A X 3443E t o c 04OUTPUT LOW VOLTAGE (V)R E C E I V E R O U T P U T C U R R E N T (m A )5.04.50.5 1.0 1.5 2.5 3.0 3.52.0 4.051015202530354000RECEIVER OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGEM A X 3443E t o c 05OUTPUT HIGH VOLTAGE (V)R E C E I V E R O U T P U T C U R R E N T (m A )5.04.50.5 1.0 1.5 2.5 3.0 3.52.0 4.051015202530354000RECEIVER OUTPUT VOLTAGEvs. TEMPERATURETEMPERATURE (°C)R E C E I V E R O U T P U T V O L T A G E (V )110956580-105203550-250.51.01.52.02.53.03.54.04.55.0-40125DRIVER OUTPUT CURRENTvs. DIFFERENTIAL OUTPUT VOLTAGEDIFFERENTIAL OUTPUT VOLTAGE (V A - V B ) (V)D R I VE R O U T P U T C U R R E N T (m A )0.51.0 1.52.53.0 3.52.010203040506070800DIFFERENTIAL OUTPUT VOLTAGEvs. TEMPERATURETEMPERATURE (°C)D I F FE R E N T I A L O U T P U T V O L T A G E (V )110956580-105203550-250.51.01.52.02.53.03.50-40125Typical Operating Characteristics(V CC = +5V, T A = +25°C, unless otherwise noted.)NO-LOAD SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )1109580655035205-10-251234560-40125NO-LOAD SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )1109580655035205-10-2548121620240-40125SHUTDOWN SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )1109580655035205-10-250.11100.01-40125A, B CURRENTvs. A, B VOLTAGE (TO GROUND)A, B VOLTAGE (V)A ,BC U R R E N T (μA )40306050-50-40-30-10010-2020-800-400-1600-2000-12000400800120016002000-60MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 TransceiversOD OCFigure 3. Driver Propagation TimesTest Circuits and WaveformsM A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 8_______________________________________________________________________________________Figure 7. Receiver Propagation DelayFigure 5. Driver Enable and Disable TimesMAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers_______________________________________________________________________________________9Note 4:The input pulse is supplied by a generator with the following characteristics: f = 5MHz, 50% duty cycle; tr ≤6ns; Z 0= 50Ω.Note 5:C L includes probe and stray capacitance.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 10______________________________________________________________________________________MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________11Table 5. MAX3440E/MAX3441E (RS-485/RS-422)Detailed DescriptionThe MAX3440E–MAX3444E fault-protected transceivers for RS-485/RS-422 and J1708 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see the True Fail-Safe section). All devices have a hot-swap input structure that prevents disturbances on the differential signal lines when a circuit board is plugged into a hot back-plane (see the Hot-Swap Capability section). The MAX3440E/MAX3442E/MAX3444E feature a reduced slew-rate driver that minimizes EMI and reduces reflec-tions caused by improperly terminated cables, allowing error-free data transmission up to 250kbps (see the Reduced EMI and Reflections section). The MAX3441E/MAX3443E drivers are not slew-rate limited, allowing transmit speeds up to 10Mbps.DriverThe driver accepts a single-ended, logic-level input (DI) and transfers it to a differential, RS-485/RS-422level output (A and B). Deasserting the driver enable places the driver outputs (A and B) into a high-imped-ance state.ReceiverThe receiver accepts a differential, RS-485/RS-422level input (A and B), and transfers it to a single-ended,logic-level output (RO). Deasserting the receiver enable places the receiver inputs (A and B) into a high-imped-ance state (see Tables 1–7).Low-Power Shutdown(MAX3442E/MAX3443E/MAX3444E)The MAX3442E/MAX3443E/MAX3444E offer a low-power shutdown mode. Force DE low and RE high to shut down the MAX3442E/MAX3443E. Force DE and RE high to shut down the MAX3444E. A time delay of 50ns prevents the device from accidentally entering shutdown due to logic skews when switching between transmit and receive modes. Holding DE low and RE high for at least 800ns guarantees that the MAX3442E/MAX3443E enter shutdown. In shutdown, the devices consume a maxi-mum 20µA supply current.±60V Fault ProtectionThe driver outputs/receiver inputs of RS-485 devices in industrial network applications often experience voltage faults resulting from shorts to the power grid that exceed the -7V to +12V range specified in the EIA/TIA-485 standard. In these applications, ordinary RS-485devices (typical absolute maximum -8V to +12.5V)require costly external protection devices. To reduce system complexity and eliminate this need for external protection, the driver outputs/receiver inputs of the MAX3440E–MAX3444E withstand voltage faults up to ±60V with respect to ground without damage.Protection is guaranteed regardless whether the device is active, shut down, or without power.True Fail-SafeThe MAX3440E–MAX3444E use a -50mV to -200mV differential input threshold to ensure true fail-safe receiver inputs. This threshold guarantees the receiver outputs a logic high for shorted, open, or idle data lines. The -50mV to -200mV threshold complies with the ±200mV threshold EIA/TIA-485 standard.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 12______________________________________________________________________________________±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX3440E–MAX3444E receiver inputs/driver outputs (A, B) have extra protection against static electricity found in normal operation. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ±15kV ESD without damage. After an ESD event, the MAX3440E–MAX3444E continue working without latchup.ESD protection can be tested in several ways. The receiver inputs are characterized for protection to ±15kV using the Human Body Model.ESD Test ConditionsESD performance depends on a number of conditions.Contact Maxim for a reliability report that documents test setup, methodology, and results.Human Body ModelFigure 9a shows the Human Body Model, and Figure 9b 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 inter-est, which is then discharged into the device through a 1.5k Ωresistor.Driver Output ProtectionTwo mechanisms prevent excessive output current and power dissipation caused by faults or bus contention.The first, a foldback current limit on the driver output stage, provides immediate protection against short cir-cuits over the whole common-mode voltage range. The second, a thermal shutdown circuit, forces the driver out-puts into a high-impedance state if the die temperature exceeds +160°C. Normal operation resumes when the die temperature cools to +140°C, resulting in a pulsed output during continuous short-circuit conditions.MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________13Figure 9a. Human Body ESD Test ModelM A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 14______________________________________________________________________________________Hot-Swap CapabilityHot-Swap InputsInserting circuit boards into a hot, or powered, back-plane may cause voltage transients on DE, DE/RE, RE ,and receiver inputs A and B that can lead to data errors.For example, upon initial circuit board insertion, the processor undergoes a power-up sequence. During this period, the high-impedance state of the output drivers makes them unable to drive the MAX3440E–MAX3444E enable inputs to a defined logic level. Meanwhile, leak-age currents of up to 10µA from the high-impedance out-put, or capacitively coupled noise from V CC or G ND,could cause an input to drift to an incorrect logic state.To prevent such a condition from occurring, the MAX3440E–MAX3443E feature hot-swap input circuitry on DE, DE/RE, and RE to guard against unwanted dri-ver activation during hot-swap situations. The MAX3444E has hot-swap input circuitry only on RE .When V CC rises, an internal pulldown (or pullup for RE )circuit holds DE low for at least 10µs, and until the cur-rent into DE exceeds 200µA. After the initial power-up sequence, the pulldown circuit becomes transparent,resetting the hot-swap tolerable input.Hot-Swap Input CircuitryAt the driver-enable input (DE), there are two NMOS devices, M1 and M2 (Figure 10). When V CC ramps from zero, an internal 15µs timer turns on M2 and sets the SR latch, which also turns on M1. Transistors M2, a 2mA current sink, and M1, a 100µA current sink, pull DE to GND through a 5.6k Ωresistor. M2 pulls DE to the disabled state against an external parasitic capaci-tance up to 100pF that may drive DE high. After 15µs,the timer deactivates M2 while M1 remains on, holding DE low against three-state leakage currents that may drive DE high. M1 remains on until an external current source overcomes the required input current. At this time, the SR latch resets M1 and turns off. When M1turns off, DE reverts to a standard, high-impedance CMOS input. Whenever V CC drops below 1V, the input is reset.A complementary circuit for RE uses two PMOS devices to pull RE to V CC .__________Applications Information128 Transceivers on the BusThe MAX3440E–MAX3444E transceivers 1/4-unit-load receiver input impedance (48k Ω) allows up to 128transceivers connected in parallel on one communica-tion line. Connect any combination of these devices,and/or other RS-485 devices, for a maximum of 32-unit loads to the line.Reduced EMI and ReflectionsThe MAX3440E/MAX3442E/MAX3444E are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 11shows the driver output waveform and its Fourier analy-sis of a 125kHz signal transmitted by a MAX3443E.High-frequency harmonic components with large ampli-tudes are evident.Figure 12 shows the same signal displayed for a MAX3442E transmitting under the same conditions.Figure 12’s high-frequency harmonic components are much lower in amplitude, compared with Figure 11’s,and the potential for EMI is significantly reduced.Figure 10. Simplified Structure of the Driver Enable Pin (DE)In general, a transmitter’s rise time relates directly to the length of an unterminated stub, which can be dri-ven with only minor waveform reflections. The following equation expresses this relationship conservatively:Length = t RISE / (10 x 1.5ns/ft)where t RISE is the transmitter’s rise time.For example, the MAX3442E’s rise time is typically 800ns, which results in excellent waveforms with a stub length up to 53ft. A system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the UART samples them.RS-485 ApplicationsThe MAX3440E–MAX3443E transceivers provide bidi-rectional data communications on multipoint bus trans-mission lines. Figures 13 and 14show a typical network applications circuit. The RS-485 standard covers line lengths up to 4000ft. To minimize reflections and reduce data errors, terminate the signal line at both ends in its characteristic impedance, and keep stub lengths off the main line as short as possible.J1708 ApplicationsThe MAX3444E is designed for J1708 applications. To configure the MAX3444E, connect DE and RE to G ND.Connect the signal to be transmitted to TXD. Terminate the bus with the load circuit as shown in Figure 15. The drivers used by SAE J1708 are used in a dominant-mode application. DE is active low; a high input on DE places the outputs in high impedance. When the driver is disabled (TXD high or DE high), the bus is pulled high by external bias resistors R1 and R2. Therefore, a logic level high is encoded as recessive. When all transceivers are idle in this configuration, all receivers output logic high because of the pullup resistor on A and pulldown resistor on B. R1 and R2 provide the bias for the recessive state.C1 and C2 combine to form a 6MHz lowpass filter, effec-tive for reducing FM interference. R2, C1, R4, and C2combine to form a 1.6MHz lowpass filter, effective for reducing AM interference. Because the bus is untermi-nated, at high frequencies, R3 and R4 perform a pseudotermination. This makes the implementation more flexible, as no specific termination nodes are required at the ends of the bus.MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________155.00MHz 500kHz/div 020dB/div Figure 11. Driver Output Waveform and FFT Plot of MAX3443E Transmitting a 125kHz Signal 5.00MHz500kHz/div 020dB/divFigure 12. Driver Output Waveform and FFT Plot of MAX3442E Transmitting a 125kHz SignalM A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 16______________________________________________________________________________________Figure 13. MAX3440E/MAX3441E Typical RS-485 NetworkFigure 14. MAX3442E/MAX3443E Typical RS-485 NetworkMAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 TransceiversFigure 15. J1708 Application CircuitChip InformationTRANSISTOR COUNT: 310PROCESS: BiCMOSPin Configurations and Typical Operating Circuits (continued)M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 18______________________________________________________________________________________Ordering Information (continued)MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________19Package 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 .)M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. N o circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.20____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information (continued)(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 1: 1, 6, 11。
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General DescriptionThe MAX3440E–MAX3444E fault-protected RS-485 and J1708 transceivers feature ±60V protection from signal faults on communication bus lines. Each device contains one differential line driver with three-state output and one differential line receiver with three-state input. The 1/4-unit-load receiver input impedance allows up to 128 trans-ceivers on a single bus. The devices operate from a 5V supply at data rates of up to 10Mbps. True fail-safe inputs guarantee a logic-high receiver output when the receiver inputs are open, shorted, or connected to an idle data line.Hot-swap circuitry eliminates false transitions on the data bus during circuit initialization or connection to a live backplane. Short-circuit current-limiting and ther-mal shutdown circuitry protect the driver against exces-sive power dissipation, and on-chip ±15kV ESD protection eliminates costly external protection devices.The MAX3440E–MAX3444E are available in 8-pin SO and PDIP packages and are specified over industrial and automotive temperature ranges.ApplicationsRS-422/RS-485 Communications Truck and Trailer Applications Industrial NetworksTelecommunications Systems Automotive Applications Features♦±15kV ESD Protection ♦±60V Fault Protection♦Guaranteed 10Mbps Data Rate (MAX3441E/MAX3443E)♦Hot Swappable for Telecom Applications ♦True Fail-Safe Receiver Inputs♦Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission(MAX3440E/MAX3442E/MAX3444E)♦Allow Up to 128 Transceivers on the Bus ♦-7V to +12V Common-Mode Input Range♦Automotive Temperature Range (-40°C to +125°C)♦Industry-Standard PinoutMAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers________________________________________________________________Maxim Integrated Products 1Pin Configurations and Typical Operating CircuitsOrdering Information19-2666; Rev 1; 12/05For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,or visit Maxim’s website at .Ordering Information continued at end of data sheet.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSStresses 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.Voltages Referenced to GNDV CC ........................................................................................+7V FAULT, DE/RE, RE , DE, DE , DI, TXD..........-0.3V to (V CC + 0.3V)A, B (Note 1)........................................................................±60V RO..............................................................-0.3V to (V CC + 0.3V)Short-Circuit Duration (RO, A, B)...............................Continuous Continuous Power Dissipation (T A = +70°C)8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW 8-Pin PDIP (derate 9.09mW/°C above +70°C).............727mWOperating Temperature RangesMAX344_EE_ _...............................................-40°C to +85°C MAX344_EA_ _.............................................-40°C to +125°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering, 10s).................................+300°CDC ELECTRICAL CHARACTERISTICSNote 1:A, B must be terminated with 54Ωor 100Ωto guarantee ±60V fault protection.MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 TransceiversDC ELECTRICAL CHARACTERISTICS (continued)(V = +4.75V to +5.25V, T = T to T , unless otherwise noted. Typical values are at V = +5V and T = +25°C.)M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 4_______________________________________________________________________________________SWITCHING CHARACTERISTICS (MAX3440E/MAX3442E/MAX3444E)MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers_______________________________________________________________________________________5SWITCHING CHARACTERISTICS (MAX3441E/MAX3443E)(V CC = +4.75V to +5.25V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at V CC = +5V and T A = +25°C.)Note 3:The short-circuit output current applies to peak current just before foldback current limiting; the short-circuit foldback outputcurrent applies during current limiting to allow a recovery from bus contention.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 6_______________________________________________________________________________________RECEIVER OUTPUT CURRENT vs. OUTPUT LOW VOLTAGEM A X 3443E t o c 04OUTPUT LOW VOLTAGE (V)R E C E I V E R O U T P U T C U R R E N T (m A )5.04.50.5 1.0 1.5 2.5 3.0 3.52.0 4.051015202530354000RECEIVER OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGEM A X 3443E t o c 05OUTPUT HIGH VOLTAGE (V)R E C E I V E R O U T P U T C U R R E N T (m A )5.04.50.5 1.0 1.5 2.5 3.0 3.52.0 4.051015202530354000RECEIVER OUTPUT VOLTAGEvs. TEMPERATURETEMPERATURE (°C)R E C E I V E R O U T P U T V O L T A G E (V )110956580-105203550-250.51.01.52.02.53.03.54.04.55.0-40125DRIVER OUTPUT CURRENTvs. DIFFERENTIAL OUTPUT VOLTAGEDIFFERENTIAL OUTPUT VOLTAGE (V A - V B ) (V)D R I VE R O U T P U T C U R R E N T (m A )0.51.0 1.52.53.0 3.52.010203040506070800DIFFERENTIAL OUTPUT VOLTAGEvs. TEMPERATURETEMPERATURE (°C)D I F FE R E N T I A L O U T P U T V O L T A G E (V )110956580-105203550-250.51.01.52.02.53.03.50-40125Typical Operating Characteristics(V CC = +5V, T A = +25°C, unless otherwise noted.)NO-LOAD SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )1109580655035205-10-251234560-40125NO-LOAD SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )1109580655035205-10-2548121620240-40125SHUTDOWN SUPPLY CURRENTvs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (μA )1109580655035205-10-250.11100.01-40125A, B CURRENTvs. A, B VOLTAGE (TO GROUND)A, B VOLTAGE (V)A ,BC U R R E N T (μA )40306050-50-40-30-10010-2020-800-400-1600-2000-12000400800120016002000-60MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 TransceiversOD OCFigure 3. Driver Propagation TimesTest Circuits and WaveformsM A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 8_______________________________________________________________________________________Figure 7. Receiver Propagation DelayFigure 5. Driver Enable and Disable TimesMAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers_______________________________________________________________________________________9Note 4:The input pulse is supplied by a generator with the following characteristics: f = 5MHz, 50% duty cycle; tr ≤6ns; Z 0= 50Ω.Note 5:C L includes probe and stray capacitance.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 10______________________________________________________________________________________MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________11Table 5. MAX3440E/MAX3441E (RS-485/RS-422)Detailed DescriptionThe MAX3440E–MAX3444E fault-protected transceivers for RS-485/RS-422 and J1708 communication contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see the True Fail-Safe section). All devices have a hot-swap input structure that prevents disturbances on the differential signal lines when a circuit board is plugged into a hot back-plane (see the Hot-Swap Capability section). The MAX3440E/MAX3442E/MAX3444E feature a reduced slew-rate driver that minimizes EMI and reduces reflec-tions caused by improperly terminated cables, allowing error-free data transmission up to 250kbps (see the Reduced EMI and Reflections section). The MAX3441E/MAX3443E drivers are not slew-rate limited, allowing transmit speeds up to 10Mbps.DriverThe driver accepts a single-ended, logic-level input (DI) and transfers it to a differential, RS-485/RS-422level output (A and B). Deasserting the driver enable places the driver outputs (A and B) into a high-imped-ance state.ReceiverThe receiver accepts a differential, RS-485/RS-422level input (A and B), and transfers it to a single-ended,logic-level output (RO). Deasserting the receiver enable places the receiver inputs (A and B) into a high-imped-ance state (see Tables 1–7).Low-Power Shutdown(MAX3442E/MAX3443E/MAX3444E)The MAX3442E/MAX3443E/MAX3444E offer a low-power shutdown mode. Force DE low and RE high to shut down the MAX3442E/MAX3443E. Force DE and RE high to shut down the MAX3444E. A time delay of 50ns prevents the device from accidentally entering shutdown due to logic skews when switching between transmit and receive modes. Holding DE low and RE high for at least 800ns guarantees that the MAX3442E/MAX3443E enter shutdown. In shutdown, the devices consume a maxi-mum 20µA supply current.±60V Fault ProtectionThe driver outputs/receiver inputs of RS-485 devices in industrial network applications often experience voltage faults resulting from shorts to the power grid that exceed the -7V to +12V range specified in the EIA/TIA-485 standard. In these applications, ordinary RS-485devices (typical absolute maximum -8V to +12.5V)require costly external protection devices. To reduce system complexity and eliminate this need for external protection, the driver outputs/receiver inputs of the MAX3440E–MAX3444E withstand voltage faults up to ±60V with respect to ground without damage.Protection is guaranteed regardless whether the device is active, shut down, or without power.True Fail-SafeThe MAX3440E–MAX3444E use a -50mV to -200mV differential input threshold to ensure true fail-safe receiver inputs. This threshold guarantees the receiver outputs a logic high for shorted, open, or idle data lines. The -50mV to -200mV threshold complies with the ±200mV threshold EIA/TIA-485 standard.M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 12______________________________________________________________________________________±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The MAX3440E–MAX3444E receiver inputs/driver outputs (A, B) have extra protection against static electricity found in normal operation. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ±15kV ESD without damage. After an ESD event, the MAX3440E–MAX3444E continue working without latchup.ESD protection can be tested in several ways. The receiver inputs are characterized for protection to ±15kV using the Human Body Model.ESD Test ConditionsESD performance depends on a number of conditions.Contact Maxim for a reliability report that documents test setup, methodology, and results.Human Body ModelFigure 9a shows the Human Body Model, and Figure 9b 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 inter-est, which is then discharged into the device through a 1.5k Ωresistor.Driver Output ProtectionTwo mechanisms prevent excessive output current and power dissipation caused by faults or bus contention.The first, a foldback current limit on the driver output stage, provides immediate protection against short cir-cuits over the whole common-mode voltage range. The second, a thermal shutdown circuit, forces the driver out-puts into a high-impedance state if the die temperature exceeds +160°C. Normal operation resumes when the die temperature cools to +140°C, resulting in a pulsed output during continuous short-circuit conditions.MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________13Figure 9a. Human Body ESD Test ModelM A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 14______________________________________________________________________________________Hot-Swap CapabilityHot-Swap InputsInserting circuit boards into a hot, or powered, back-plane may cause voltage transients on DE, DE/RE, RE ,and receiver inputs A and B that can lead to data errors.For example, upon initial circuit board insertion, the processor undergoes a power-up sequence. During this period, the high-impedance state of the output drivers makes them unable to drive the MAX3440E–MAX3444E enable inputs to a defined logic level. Meanwhile, leak-age currents of up to 10µA from the high-impedance out-put, or capacitively coupled noise from V CC or G ND,could cause an input to drift to an incorrect logic state.To prevent such a condition from occurring, the MAX3440E–MAX3443E feature hot-swap input circuitry on DE, DE/RE, and RE to guard against unwanted dri-ver activation during hot-swap situations. The MAX3444E has hot-swap input circuitry only on RE .When V CC rises, an internal pulldown (or pullup for RE )circuit holds DE low for at least 10µs, and until the cur-rent into DE exceeds 200µA. After the initial power-up sequence, the pulldown circuit becomes transparent,resetting the hot-swap tolerable input.Hot-Swap Input CircuitryAt the driver-enable input (DE), there are two NMOS devices, M1 and M2 (Figure 10). When V CC ramps from zero, an internal 15µs timer turns on M2 and sets the SR latch, which also turns on M1. Transistors M2, a 2mA current sink, and M1, a 100µA current sink, pull DE to GND through a 5.6k Ωresistor. M2 pulls DE to the disabled state against an external parasitic capaci-tance up to 100pF that may drive DE high. After 15µs,the timer deactivates M2 while M1 remains on, holding DE low against three-state leakage currents that may drive DE high. M1 remains on until an external current source overcomes the required input current. At this time, the SR latch resets M1 and turns off. When M1turns off, DE reverts to a standard, high-impedance CMOS input. Whenever V CC drops below 1V, the input is reset.A complementary circuit for RE uses two PMOS devices to pull RE to V CC .__________Applications Information128 Transceivers on the BusThe MAX3440E–MAX3444E transceivers 1/4-unit-load receiver input impedance (48k Ω) allows up to 128transceivers connected in parallel on one communica-tion line. Connect any combination of these devices,and/or other RS-485 devices, for a maximum of 32-unit loads to the line.Reduced EMI and ReflectionsThe MAX3440E/MAX3442E/MAX3444E are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. Figure 11shows the driver output waveform and its Fourier analy-sis of a 125kHz signal transmitted by a MAX3443E.High-frequency harmonic components with large ampli-tudes are evident.Figure 12 shows the same signal displayed for a MAX3442E transmitting under the same conditions.Figure 12’s high-frequency harmonic components are much lower in amplitude, compared with Figure 11’s,and the potential for EMI is significantly reduced.Figure 10. Simplified Structure of the Driver Enable Pin (DE)In general, a transmitter’s rise time relates directly to the length of an unterminated stub, which can be dri-ven with only minor waveform reflections. The following equation expresses this relationship conservatively:Length = t RISE / (10 x 1.5ns/ft)where t RISE is the transmitter’s rise time.For example, the MAX3442E’s rise time is typically 800ns, which results in excellent waveforms with a stub length up to 53ft. A system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the UART samples them.RS-485 ApplicationsThe MAX3440E–MAX3443E transceivers provide bidi-rectional data communications on multipoint bus trans-mission lines. Figures 13 and 14show a typical network applications circuit. The RS-485 standard covers line lengths up to 4000ft. To minimize reflections and reduce data errors, terminate the signal line at both ends in its characteristic impedance, and keep stub lengths off the main line as short as possible.J1708 ApplicationsThe MAX3444E is designed for J1708 applications. To configure the MAX3444E, connect DE and RE to G ND.Connect the signal to be transmitted to TXD. Terminate the bus with the load circuit as shown in Figure 15. The drivers used by SAE J1708 are used in a dominant-mode application. DE is active low; a high input on DE places the outputs in high impedance. When the driver is disabled (TXD high or DE high), the bus is pulled high by external bias resistors R1 and R2. Therefore, a logic level high is encoded as recessive. When all transceivers are idle in this configuration, all receivers output logic high because of the pullup resistor on A and pulldown resistor on B. R1 and R2 provide the bias for the recessive state.C1 and C2 combine to form a 6MHz lowpass filter, effec-tive for reducing FM interference. R2, C1, R4, and C2combine to form a 1.6MHz lowpass filter, effective for reducing AM interference. Because the bus is untermi-nated, at high frequencies, R3 and R4 perform a pseudotermination. This makes the implementation more flexible, as no specific termination nodes are required at the ends of the bus.MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________155.00MHz 500kHz/div 020dB/div Figure 11. Driver Output Waveform and FFT Plot of MAX3443E Transmitting a 125kHz Signal 5.00MHz500kHz/div 020dB/divFigure 12. Driver Output Waveform and FFT Plot of MAX3442E Transmitting a 125kHz SignalM A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 16______________________________________________________________________________________Figure 13. MAX3440E/MAX3441E Typical RS-485 NetworkFigure 14. MAX3442E/MAX3443E Typical RS-485 NetworkMAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 TransceiversFigure 15. J1708 Application CircuitChip InformationTRANSISTOR COUNT: 310PROCESS: BiCMOSPin Configurations and Typical Operating Circuits (continued)M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers 18______________________________________________________________________________________Ordering Information (continued)MAX3440E–MAX3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers______________________________________________________________________________________19Package 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 .)M A X 3440E –M A X 3444E±15kV ESD-Protected, ±60V Fault-Protected,10Mbps, Fail-Safe RS-485/J1708 Transceivers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. N o circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.20____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600©2005 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.Package Information (continued)(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 1: 1, 6, 11。