MAX3450EEUD+T中文资料

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MEMORY存储芯片MAX3485EESA中文规格书

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.。

MAX3444E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 Featureso ±15kV ESD Protection o ±60V Fault Protectiono Guaranteed 10Mbps Data Rate (MAX3441E/MAX3443E)o Hot Swappable for Telecom Applications o True Fail-Safe Receiver Inputso Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission(MAX3440E/MAX3442E/MAX3444E)o Allow Up to 128 Transceivers on the Bus o -7V to +12V Common-Mode Input Rangeo Automotive Temperature Range (-40°C to +125°C)o 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 0; 10/02For pricing, delivery, and ordering information,please contact Maxim/Dallas 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 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.)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 (n A )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______________________________________________________________________________________11Detailed 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 2V/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©2002 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 .)。

MC Z-dek硬件用户手册

2.9.1 JTAG........................................................................................................................28 2.10 电源 ................................................................................................................................28
7020 SOM
7020 工业 SOM
7020 低价 SOM
7020 工业低价 SOM
*除 microSD 卡的连接器外，它只能在-25℃~85℃范围。
1.1 产品定义
名称
表 2 - 产品定义定义
评估套件
MC Z-dek 评估套件包括可以让开发和评估简化的 Zynq7010 设备和各种附带配件。这些附带的配件包括一个 micro-SUB 线缆， Vivado 设计软件（只支持 7010），可选的 4GB microSD 卡（预装一个 Linux 测试系统），和一个纸质包装盒。详细的列表和教程可以在 www.megacreate. cn 上找到。该套件包含的板卡可以作为一个单独的板卡独立运行也可以作为一个模块系统（SOM）的插件运行于一个底板上。
1. 介绍
MC Z-dek 是一款较为经济的评估版，可用于绝大多数板上系统（system on module，SOM）的开发和验证。本文档内容覆盖了下述的产品。
表 1 - Z-dek 系列产品
名称Βιβλιοθήκη 部件编号Zynq 芯片测试温度范围

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。

max3485中文资料

max485接口芯片是Maxim公司的一种RS－485芯片。

简介：MAX485、MAX487-MAX491以及MAX1487是用于RS-485与RS-422通信的低功耗收发器，每个器件中都具有一个驱动器和一个接收器。

MAX483、MAX487、MAX488以及MAX489具有限摆率驱动器，可以减小EMI，并降低由不恰当的终端匹配电缆引起的反射，实现最高250kbps的无差错数据传输。

MAX481、MAX485、MAX490、MAX491、MAX1487的驱动器摆率不受限制，可以实现最高2.5Mbps的传输速率。

这些收发器在驱动器禁用的空载或满载状态下，吸取的电源电流在120µA至500µA之间。

另外，MAX481、MAX483与MAX487具有低电流关断模式，仅消耗0.1µA。

所有器件都工作在5V单电源下。

采用单一电源+5 V工作，额定电流为300 μA，采用半双工通讯方式。

它完成将TTL电平转换为RS－485电平的功能。

MAX485芯片的结构和引脚都非常简单,内部含有一个驱动器和接收器。

RO和DI 端分别为接收器的输出和驱动器的输入端，与单片机连接时只需分别与单片机的RXD和TXD相连即可；/RE和DE端分别为接收和发送的使能端，当/RE为逻辑0时，器件处于接收状态；当DE为逻辑1时，器件处于发送状态，因为MAX485工作在半双工状态，所以只需用单片机的一个管脚控制这两个引脚即可；A端和B端分别为接收和发送的差分信号端,当A引脚的电平高于B时，代表发送的数据为1；当A的电平低于B端时，代表发送的数据为0。

在与单片机连接时接线非常简单。

只需要一个信号控制MAX485的接收和发送即可。

同时将A和B端之间加匹配电阻，一般可选100Ω的电阻。

基本参数：半双工；限摆率：NO；低电流关断模式：NO；接收允许控制：YES；静态电流300uA；引脚数：8。

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.。

MAX3245EETX+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 .)。

MAX3225中文资料

Ordering Information continued at end of data sheet.
_____________________ Selector Guide
PART NO. OF GUARANTEED AUTOREADY DRIVERS/ DATA RATE SHUTDOWN OUTPUT RECEIVERS (bps) PLUS 2/2 2/2 1/1 1/1 3/5 3/5 250k 1M 250k 1M 250k 1M — —
MAX3224–MAX3227/MAX3244/MAX3245 †
_______________Ordering Information
PART MAX3224CPP MAX3224CAP MAX3224EPP MAX3224EAP MAX3225CPP MAX3225CAP MAX3225EPP MAX3225EAP 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 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP 20 Plastic DIP 20 SSOP
________________________Applications
Notebook, Subnotebook, and Palmtop Computers Cellular Phones Battery-Powered Equipment Hand-Held Equipment Peripherals Printers

智能定位器 YT-3400 3450系列 (新的NCS型) 产品手册说明书

智能定位器产品手册YT-3400 / 3450系列(新的NCS型)YT-3400YT-3450接线端子形状Rotork YTC Limited目录1引言 (6)1.1一般用户信息 (6)1.2制造商保修 (6)1.3防爆警告和特定使用条件 (7)2产品说明 (8)2.1常规信息 (8)2.2主要特点和功能 (8)2.3标签说明 (9)2.4产品代号 (14)2.5产品规格 (15)2.6数字输入和数字输出规格 (16)2.7证书 (17)2.8部件和组件 (20)2.9产品尺寸 (21)2.9.1YT-3400 (21)2.9.2YT-3450 (22)3安装 (23)3.1安全 (23)3.2安装工具 (24)3.3直行程定位器安装 (24)3.4角行程定位器安装 (28)3.4.1组件 (28)3.4.2角行程支架信息 (29)3.4.3角行程定位器安装步骤 (30)4连接- 空气 (32)4.1安全 (32)4.2供给压力条件 (32)4.3管路连接 (32)4.4连接- 执行器管路 (33)4.4.1单作用执行器 (33)4.4.2双作用执行器 (33)5连接- 电源 (34)5.1安全 (34)5.2端子概览 (35)5.2.1接地 (38)6调节 (39)6.1A/M开关调节 (39)6.2可变孔口件调节 (39)7维护 (40)7.1供给压力 (40)7.2密封件 (40)8自动校准和PCB操作 (41)8.1警告 (41)8.2LCD显示器和按钮 (41)8.2.1LCD显示器和符号 (41)8.2.2按钮和功能 (42)8.3菜单层级 (43)8.4运行模式监控 (44)8.5配置和操作 (45)8.6校准(CALIb) (50)8.6.1动作类型(SINGLE / dOUBLE) (51)8.6.2自动校准1(AUTO 1) (51)8.6.3自动校准2(AUTO 2) (52)8.6.4自动校准3(AUTO 3) (53)8.6.5行程零点(TVL ZERO)和行程终点(TVL ENd) (54)8.7手动操作(MAN OPER) (55)8.7.1通过设置位置进行手动操作(MAN SP) (55)8.7.2利用MV进行手动操作(MAN MV) (55)8.8控制参数(CTL PARM) (56)8.8.1死区(dEAdbANd) (56)8.8.2向前P参数(KP UP), 向后P参数(KP dN) (57)8.8.3向前积分时间参数(TI UP), 反向积分时间参数(TI dN) (57)8.8.4向前D参数(KP UP), 向后D参数(KP dN) (58)8.8.5GAP参数(GAP) (58)8.8.6GAP P参数(GP) (58)8.8.7GAP I参数(GI) (59)8.8.8GAP D参数(Gd) (59)8.8.9自动死区模式(AUTO db) (59)8.8.10性能模式(PER STbL / NORM / FAST) (60)8.9输入配置(IN CFG) (61)8.9.1信号方向(SIG NORM / REVS) (61)8.9.2分程模式(SPLIT 4.20 / 4.12 / 12.20 / CSt) (62)8.9.3自定义分程模式零点(CST ZERO) (62)8.9.4自定义分程模式终点(CST ENd) (63)8.9.5阀门流量特性曲线(CHAR LIN / EQ / USER 5P / USER 21P) (63)8.9.6用户设置5个特性点(USER 5P) (64)8.9.7用户设置21个特性点(USER 21P) (65)8.9.8用力打开(TSHUT OP) (66)8.9.9用力关闭(TSHUT CL) (67)8.9.10目标位置上升速率(RAMP UP)和目标位置下降速率(RAMP dN) (68)8.9.11数字输入功能(dIF dIF OFF / FCL / FOP / PSTA / PSTO) (70)8.9.12数字输入逻辑(dI LOGIC HI / Lo) (70)8.10输出配置(OUT CFG) (71)8.10.1位置发送器方向(PTM NORM / REVS) (71)8.10.2位置发送器零点/终点(PTM ZERO / ENd) (72)8.10.3HART反馈方向(HT NORM / REVS) (73)8.10.4反算(bACKCAL oFF / on) (74)8.10.5限位开关模式(LS MOdE oFF/ on) (74)8.10.6数字输出功能(dO1 或dO2 OFF / ...) . (76)8.10.7数字输出控制逻辑(dO1 或dO2 LOGIC HI / Lo) (77)8.10.8模拟输出功能(AOF OFF / ...).. (78)8.10.9模拟输出逻辑(AO LOGIC Lo / HI) (79)8.11设备配置(dEV CFG) (80)8.11.1动作设置(ACT) (80)8.11.2直行程反馈杆设置模式(LEVT STd / AdT) (80)8.11.3直行程差值(ITP oFF / on) (81)8.11.4参数锁定（Write Protect，W UNLOCK / LOCK） (81)8.11.5实际位置查看模式（View Mode，VI NORM / REVS） (81)8.11.6轮询地址设置(POL AddR) (82)8.11.7出厂重置(dEFAULT oFF / on) (82)8.11.8定位器自测试(SELFTEST) (83)8.12诊断模式(dIAGNd) (84)8.12.1默认警报设置 (84)8.12.2程序状态(PS) (87)8.12.3设备状态(dS) (88)8.12.4查看监控计数(VI CNTS) (90)8.12.5诊断限值配置(LIMT CFG) (91)8.12.6重置警报状态(RST ALRM OFF / on) (92)8.12.7查看事件日志(EVT LOG) (93)8.12.8局部行程测试记录（查看PST结果记录，PST RSLT） (94)8.12.9PST配置(PST CFG) (95)8.12.10运行PST(PST NOW) (96)8.12.11定期PST测试（PST计划，PST SCHd oFF / on） (96)8.13位置信息(INFO) (97)8.14自动校准过程中显示的错误代码 (99)8.15状态和警报代号 (100)9主要软件地图 (103)1 引言1.1 一般用户信息感谢您购买Rotork YTC Limited产品。

MAX3490CPA+中文资料

_______________General DescriptionThe MAX3483, MAX3485, MAX3486, MAX3488,MAX3490, and MAX3491 are 3.3V, low-power trans-ceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX3483 and MAX3488 feature slew-rate-limited dri-vers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The par-tially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491transmit at up to 10Mbps.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 MAX3488, MAX3490, and MAX3491 feature full-duplex communication, while the MAX3483, MAX3485,and MAX3486 are designed for half-duplex communi-cation.________________________ApplicationsLow-Power RS-485/RS-422 Transceivers TelecommunicationsTransceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks____________________________Featureso Operate from a Single 3.3V Supply—No Charge Pump!o Interoperable with +5V Logico 8ns Max Skew (MAX3485/MAX3490/MAX3491)o Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488) o 2nA Low-Current Shutdown Mode(MAX3483/MAX3485/MAX3486/MAX3491)o -7V to +12V Common-Mode Input Voltage Range o Allows up to 32 Transceivers on the Bus o Full-Duplex and Half-Duplex Versions Available o Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486)o Current-Limiting and Thermal Shutdown for Driver Overload Protection______________Ordering Information* Contact factory for for dice specifications.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers________________________________________________________________Maxim Integrated Products1Call toll free 1-800-998-8800 for free samples or literature.19-0333; Rev 0; 12/94PART NUMBER GUARANTEED DATA RATE (Mbps)SUPPLY VOLTAGE(V)HALF/FULL DUPLEXSLEW-RATE LIMITEDDRIVER/RECEIVER ENABLESHUTDOWN CURRENT (nA)PIN COUNT MAX34830.25Half Yes Yes 28MAX348510Half No Yes 28MAX3486 2.5Half Yes Yes 28MAX34880.25Full Yes No —8MAX349010Full No No —8MAX3491103.0 to 3.6FullNoYes214______________________________________________________________Selection TableM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSDC ELECTRICAL CHARACTERISTICS(V CC = 3.3V ±0.3V, 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.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 Plastic DIP (derate 9.09mW/°C above +70°C).....727mW 8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW14-Pin Plastic DIP (derate 10mW/°C above +70°C)......800mW 14-Pin SO (derate 8.33mW/°C above +70°C)................667mW Operating Temperature RangesMAX34_ _C_ _.......................................................0°C to +70°C MAX34_ _E_ _....................................................-40°C to +85°C Storage Temperature Range.............................-65°C to +160°C Lead Temperature (soldering, 10sec).............................+300°CMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________3DC 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—MAX3485, MAX3490, and MAX3491(V CC = 3.3V, T A = +25°C)DRIVER SWITCHING CHARACTERISTICS—MAX3486(V CC = 3.3V, T A = +25°C)M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers4_______________________________________________________________________________________DRIVER SWITCHING CHARACTERISTICS—MAX3483 and MAX3488(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, theparts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________5__________________________________________Typical 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 3483-01OUTPUT 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 3483-02OUTPUT 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 3483-07OUTPUT 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 3483-05DIFFERENTIAL OUTPUT VOLTAGE (V)O U T P U T C U R R E N T (m A )1.61.71.81.92.02.12.22.32.42.62.5-40-2020406010080DRIVER 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 3483-08OUTPUT HIGH VOLTAGE (V)O U T P U T C U R R E N T (m A )M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers0.80.70.91.01.11.2-40-2020406010080SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )_____________________________Typical Operating Characteristics (continued)0102030405060708010090-40-2020406010080SHUTDOWN CURRENT vs. TEMPERATUREM A X 3483-10TEMPERATURE (°C)S H U T D O W N C U R R E N T (n A )______________________________________________________________Pin DescriptionMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________7Figure 2. MAX3488/MAX3490 Pin Configuration and Typical Operating CircuitFigure 3. MAX3491 Pin Configuration and Typical Operating CircuitFigure 1. MAX3483/MAX3485/MAX3486 Pin Configuration and Typical Operating CircuitM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers8_______________________________________________________________________________________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 VoltageMAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX34913.3V-Powered, 10Mbps and Slew-Rate-LimitedTrue RS-485/RS-422 Transceivers_______________________________________________________________________________________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 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 34913.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers10______________________________________________________________________________________Figure 11.Receiver Propagation DelayFigure 12.Receiver Enable and Disable TimesNote 4: The input pulse is supplied by a generator with the following characteristics: PRR = 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 (MAX3483/MAX3485/MAX3486/MAX3491)Table 1. Transmitting* B and A outputs are Z and Y, respectively, for full-duplex part (MAX3491).X = Don’t care; High-Z = High impedanceTable 2. Receiving* DE is a “don’t care” (x) for the full-duplex part (MAX3491).X = Don’t care; High-Z = High impedanceDevices without Receiver/Driver Enable(MAX3488/MAX3490)Table 3. TransmittingTable 4. Receiving__________Applications InformationThe MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491 are low-power transceivers for RS-485 and RS-422 communications. The MAX3483 and MAX3488can transmit and receive at data rates up to 250kbps,the MAX3486 at up to 2.5Mbps, and the MAX3485/MAX3490/MAX3491 at up to 10Mbps. The MAX3488/MAX3490/MAX3491 are full-duplex transceivers, while the MAX3483/MAX3485/MAX3486 are half-duplex.Driver Enable (DE) and Receiver Enable (RE) pins are included on the MAX3483/MAX3485/MAX3486/MAX3491. When disabled, the driver and receiver out-puts are high impedance.Reduced EMI and Reflections (MAX3483/MAX3486/MAX3488)The MAX3483/MAX3488 are slew-rate limited, minimiz-ing EMI and reducing reflections caused by improperly terminated cables. Figure 13 shows both the driver output waveform of a MAX3485/MAX3490/MAX3491transmitting a 125kHz signal and the Fourier analysis of that waveform. High-frequency harmonics with large amplitudes are evident. Figure 14 shows the same infor-mation, but for the slew-rate-limited MAX3483/MAX3488transmitting the same signal. The high-frequency har-monics have much lower amplitudes, and the potential for EMI is significantly reduced.Low-Power Shutdown Mode(MAX3483/MAX3485/MAX3486/MAX3491)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.MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 Transceivers______________________________________________________________________________________11INPUTS OUTPUT A, B RO ≥+0.2V 1≤-0.2V 0Inputs Open1INPUT OUTPUTS DI Z Y 101015MHz500kHz/div 0Hz 5MHz500kHz/div 0Hz Figure 13. Driver Output Waveform and FFT Plot of MAX3485/MAX3490/MAX3491 Transmitting a 125kHz Signal Figure 14. Driver Output Waveform and FFT Plot of MAX3483/MAX3488 Transmitting a 125kHz SignalM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 3491True RS-485/RS-422 Transceivers12______________________________________________________________________________________B 1V/divA 1V/divRO 2V/div20ns/divDI 5V/div V Y - V Z 2V/divRO 5V/div2µs/divB 1V/divA 1V/divRO 2V/div1µs/divDI 2V/div 20ns/divZ 1V/divY 1V/divDI 2V/div Z 1V/div Y 1V/div1µs/divDI 5V/div V Y - V Z 2V/divRO 5V/div2µs/divFigure 15.MAX3485/MAX3490/MAX3491 Driver Propagation Delay Figure 17.MAX3483/MAX3488 Driver Propagation Delay Figure 16.MAX3485/MAX3490/MAX3491 Receiver Propagation Delay Driven by External RS-485 DeviceFigure 18.MAX3483/MAX3488 Receiver Propagation DelayFigure 19. MAX3483/MAX3488 System Differential Voltage at 125kHz Driving 4000 ft of Cable Figure 20. MAX3485/MAX3490/MAX3491 System Differential Voltage at 125kHz Driving 4000 ft 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 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 120Ωloads.Typical Applications The 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 possible. 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/MAX3491True RS-485/RS-422 Transceivers ______________________________________________________________________________________13M A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 3491True RS-485/RS-422 Transceivers14______________________________________________________________________________________Figure 22.MAX3488/MAX3490/MAX3491 Full-Duplex RS-485 NetworkFigure 23.Line Repeater for MAX3488/MAX3490/MAX3491MAX3483/MAX3485/MAX3486/MAX3488/MAX3490/MAX3491True RS-485/RS-422 Transceivers______________________________________________________________________________________15TRANSISTOR COUNT: 810SUBSTRATE CONNECTED TO GROUND__________________Chip Topography_Ordering Information (continued)* Contact factory for for dice specifications.0.146" (3.71mm)0.086" (2.18mm)Z/BB AY/AGNDDIDE REROVCCGNDM A X 3483/M A X 3485/M A X 3486/M A X 3488/M A X 3490/M A X 3491True RS-485/RS-422 TransceiversMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses areimplied. 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©1994 Maxim Integrated ProductsPrinted USAis a registered trademark of Maxim Integrated Products.________________________________________________________Package Information。

MAX4080TASA+中文资料

5V/V (MAX4080F/MAX4081F) 20V/V (MAX4080T/MAX4081T) 60V/V (MAX4080S/MAX4081S) ♦ ±0.1% Full-Scale Accuracy ♦ Low 100µV Input Offset Voltage ♦ Independent Operating Supply Voltage ♦ 75µA Supply Current (MAX4080) ♦ Reference Input for Bidirectional OUT (MAX4081) ♦ Available in a Space-Saving 8-Pin µMAX Package
元器件交易网
MAX4080/MAX4081
19-2562; Rev 0; 10/02
EVAALVUAAILTAIOBNLEKIT
76V, High-Side, Current-Sense Amplifiers with Voltage Output
General Description
General System/Board-Level Current Sensing
Precision High-Voltage Current Sources
Features
♦ Wide 4.5V to 76V Input Common-Mode Range ♦ Bidirectional or Unidirectional ISENSE ♦ Low-Cost, Compact, Current-Sense Solution ♦ Three Gain Versions Available
(MAX4081 Only)....-0.3V to the lesser of +18V or (VCC + 0.3V) Output Short Circuit to GND.......................................Continuous Differential Input Voltage (VRS+ - VRS-) ...............................±80V Current into Any Pin..........................................................±20mA

MAX232中文资料(官方版)

新一代器件特性 ____________________________
♦ 对于低电压、集成 ESD 保护的应用 MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E：+3.0V 至 +5.5V、低功耗、速率高达 1Mbps、利用四个 0.1µF 电容实现真正的 RS-232 收发器 (MAX3246E 提供 UCSPTM 封装 )。 ♦ 对于低成本应用 MAX221E：±15kV ESD 保护、+5V、1µA、具有 AutoShutdownTM 功能的单芯片 RS-232。
________________________________ 应用
便携式计算机低功耗调制解调器接口转换电池供电 RS-232 系统多点 RS-232 网络
_____________________________ 定购信息
PART MAX220CPE MAX220CSE MAX220CWE MAX220C/D MAX220EPE MAX220ESE MAX220EWE MAX220EJE MAX220MJE TEMP RANGE 0°C to +70°C 0°C to +70°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -55°C to +125°C PIN-PACKAGE 16 Plastic DIP 16 Narrow SO 16 Wide SO Dice* 16 Plastic DIP 16 Narrow SO 16 Wide SO 16 CERDIP 16 CERDIP

MAX2644EXT+T;中文规格书,Datasheet资料

________________________Applicatห้องสมุดไป่ตู้ons
Bluetooth 802.11 WLAN Home RF Satellite CD Radio 2.4GHz ISM Band Radios 2.4GHz Cordless Phones Wireless Local Loop (WLL)
/
2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644
Typical Operating Characteristics
(PRFIN = -30dBm, ZS = ZL = 50Ω, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2kΩ, TA = +25°C, unless otherwise noted.)
MAX2644
The MAX2644 low-cost, high third-order intercept point (IP3) low-noise amplifier (LNA) is designed for applications in 2.4GHz WLAN, ISM, and Bluetooth radio systems. It features a programmable bias, allowing the input IP3 and supply current to be optimized for specific applications. The LNA provides up to +1dBm input IP3 while maintaining a low noise figure of 2.0dB and a typical gain of 16dB. The MAX2644 is designed on a low-noise, advanced silicon-germanium (SiGe) technology. It operates with a +2.7V to +5.5V single supply and is available in an ultra-small 6-pin SC70 package.

数据恢复教程MAXTOR硬盘的固件和模块-数据恢复知识

人。高一不懂什么，但那时候却有一点点爱好学习
C：必须的，即使部分模块损坏驱动器仍然可以启动； D：如果缺失其中一个模块，驱动器也可正常启动，但是会变慢； E：即使没有此模块驱动器也可以正常运转
1cu0f3c9a 数据恢复软件/
的固件被载入，而用于启动电机的程序和初始化
磁盘上固件的过程被忽略了。将跳线设置为“安
全模式”然后运行相应程序，在“MODEL”行驱
动器型号后面就会显示出 ROM 的版本号。驱动器初始化操作需要完全复位 PCB 固件和磁盘上的固件。如果因某种原因导致磁盘上的固件不能运行，可以通过加载 LDR 文件来启动驱动器处理器。记住 LDR 文件只包括微代码而不包括驱动器运转所需的数据：缺陷表、校准参数和设置数据等。这些对数据恢复都很有用。
人。高一不懂什么，但那时候却有一点点爱好学习
21RCT-磁盘表面数据区的校正信息 A 37U_List-固件区译码表 A 78RZTBL-Zone 表 A 18AT_PDL（P-List）-P 表相应的译码表 A 1FDISK-驱动器 IDB
1BAT_POL（G-List）-增长的缺陷表 B 39ROM 拷贝 B 38 微代码的第一部分（Overlays）B 4F 微代码的第二部分（Overlays）B 95 用于某些 Poker/Ardent 驱动器中可选的 DISKB
人。高一不懂什么，但那时候却有一点点爱好学习
PC3000http://www.acelaboratory PCB 微代码和磁盘固件有不同的版本，这种差异有助于了解处理器正在运行的是哪个版本。 Poker/Ardent 系列驱动器固件包括两种：一种是正式版，一种是测试版。通过标签来识别 Maxtor 驱动器固件的版本是很复杂的，因为他们并不遵循严格的版本号规

MAX3490EESA+T中文资料

MAX3450中文资料

General DescriptionThe MAX3450E/MAX3451E/MAX3452E USB-compliant transceivers interface low-voltage ASICs with USB devices. The devices fully comply with USB 1.1 and USB 2.0 when operating at full (12Mbps) and low (1.5Mbps) speeds. The MAX3450E/MAX3451E/MAX3452E operate with V L as low as +1.65V, ensuring compatibility with low-voltage ASICs.The MAX3450E/MAX3451E/MAX3452E feature a logic-selectable suspend mode that reduces current con-sumption to less than 40µA. Integrated ±15kV ESD protection protects the USB D+ and D- bidirectional bus connections. The MAX3450E is pin compatible with Micrel’s MIC2550A. The MAX3451E features an internal 1.5k ΩUSB pullup resistor and an enumeration function that allows devices to logically disconnect while plugged in. The MAX3452E provides a push-pull bus-detect (BD) output that asserts high when V BUS is greater than +4.0V.The MAX3450E/MAX3451E/MAX3452E operate over the -40°C to +85°C extended temperature range and are available in 14-pin TSSOP and 3mm x 3mm 16-pin thin QFN packages.ApplicationsPDAsPC Peripherals Cellular Telephones Data Cradles MP3 PlayersFeatureso ±15kV ESD Protection on D+ and D-o Combined VP and VM Inputs/Outputs o +1.65V to +3.6V V L Logic Supply Input for Interfacing with Low-Voltage ASICs o Enumerate Input Function (MAX3451E)o Powered from Li+ Battery as Low as +3.1V (MAX3450E and MAX3451E)o V BUS Detection (MAX3452E)o Pin Compatible with Micrel MIC2550A (MAX3450E)o Internal D+ or D- Pullup Resistor (MAX3451E)o No Power-Supply Sequencing RequiredMAX3450E/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers________________________________________________________________Maxim Integrated Products1Pin Configurations19-2843; Rev 1; 11/03For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .Ordering InformationTypical Operating Circuit appears at end of data sheet.M A X 3450E /M A X 3451E /M A X 3452E±15kV ESD-Protected USB 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.DC ELECTRICAL CHARACTERISTICS(V BUS = +4.0V to +5.5V or V TRM = +3.0V to +3.6V, V L = +1.65V to +3.6V, T A = T MIN to T MAX , unless otherwise noted. Typical valuesM M V BUS , V L , D+, D- to GND.......................................-0.3V to +6.0V V TRM to GND............................................-0.3V to (V BUS + 0.3V)VP, VM, SUS, SPD, ENUM,RCV, OE , BD to GND................................-0.3V to (V L + 0.3V)Current (into any pin)........................................................±15mA Short-Circuit Current (D+ and D-)...................................±150mAContinuous Power Dissipation (T A = +70°C)14-Pin TSSOP(derate 9.1mW/°C above +70°C).................................727mW 16-Pin Thin QFN 3mm x 3mm(derate 14.7mW/°C above +70°C).............................1176mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s).................................+300°CMAX3450E/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers_______________________________________________________________________________________3DC ELECTRICAL CHARACTERISTICS (continued)(V= +4.0V to +5.5V or V = +3.0V to +3.6V, V = +1.65V to +3.6V, T = T to T , unless otherwise noted. Typical valuesM A X 3450E /M A X 3451E /M A X 3452E±15kV ESD-Protected USB Transceivers 4_______________________________________________________________________________________design.Note 2:Guaranteed by design, not production tested.Note 3:Production tested to +2.7V for V L ≤+3.0V.Note 4:Including external 24.3Ωseries resistor.TIMING CHARACTERISTICSMAX3450E/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers_______________________________________________________________________________________5SINGLE-ENDED RECEIVER PROPAGATION DELAY vs. V LV L (V)P R O P A G A T I O N D E L A Y (n s )3.43.21.8 2.0 2.2 2.6 2.82.4 3.01234567801.6 3.6RISE-/FALL-TIME MATCHING(FULL SPEED)20ns/div D+/D-1V/div RISE-/FALL-TIME MATCHING(LOW SPEED)100ns/divD+/D-1V/divC L = 400pF20ns/divVM 2V/divVP 2V/div OE, VP, AND VM TIMING5V/divC L = 15pF022201816141210864224015020050100250300350400SUPPLY CURRENT vs. D+/D- CAPACITANCED+/D- CAPACITANCE (pF)S U P P L Y C U R R E N T (m A )04504003503002502001501005050015020050100250300350400LOGIC SUPPLY CURRENT vs. D+/D- CAPACITANCEM A X 3450-52E t o c 06D+/D- CAPACITANCE (pF)L O G I C S U P P L Y C U R R E N T (µA )SPD = V L , f IN = 6MHzSPD = GND, f IN = 750kHz Typical Operating Characteristics(V BUS = +5.0V, V L = +3.3V, T A = +25°C, unless otherwise noted.)M A X 3450E /M A X 3451E /M A X 3452E±15kV ESD-Protected USB TransceiversDetailed Description The MAX3450E/MAX3451E/MAX3452E USB-compliant transceivers convert single-ended or differential logic-level signals to USB signals and USB signals to single-ended or differential logic-level signals. The devices fully comply with USB 1.1, as well as USB 2.0 at full- (12Mbps) and low-speed (1.5Mbps) operation. The MAX3450E/MAX3451E/MAX3452E operate with V L as low as +1.65V, ensuring compatibility with low-volt-age ASICs.The MAX3450E/MAX3451E/MAX3452E derive powerfrom the USB host (V BUS) or from a single-cell Li+ battery (MAX3450E and MAX3451E) connected to V BUS or froma +3.3V regulated supply connected to V BUS and V TRM.The MAX3450E/MAX3451E/MAX3452E meet the physical-layer specifications for logic-level supply volt-MAX3450E/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers _______________________________________________________________________________________7M A X 3450E /M A X 3451E /M A X 3452Eages (V L ) from +1.65V to +3.6V. Integrated ±15kV ESD protection protects the D+ and D- USB I/O ports.The MAX3451E features an enumerate function provid-ing an internal 1.5k Ωpullup resistor to V TRM . The enu-merate function disconnects the 1.5k Ωpullup resistor,allowing the MAX3451E to simulate a bus disconnect while powered and connected to the USB cable. The MAX3450E is pin-for-pin compatible with Micrel ’s MIC2550A. The MAX3452E features a BD output that asserts high if V BUS is greater than +4.0V. BD asserts low if V BUS is less than +3.6V. The MAX3450E and MAX3452E require external pullup resistors from either D+ or D- to V TRM to set the bus speed.Applications InformationPower-Supply ConfigurationsNormal Operating ModeConnect V L and V BUS to system power supplies (Table 1). Connect V L to a +1.65V to +3.6V supply.Connect V BUS to a +4.0V to +5.5V supply. Alternatively,the MAX3450E and MAX3451E can derive power froma single Li+ battery. Connect the battery to V BUS . V TRM remains above +3.0V for V BUS as low as +3.1V.Additionally, the MAX3450E and MAX3451E can derive power from a +3.3V ±10% voltage regulator. Connect V BUS and V TRM to an external +3.3V voltage regulator.V BUS no longer consumes current to power the internal linear regulator in this configuration.Disable ModeConnect V BUS to a system power supply and leave V L unconnected or connect to GND. D+ and D- enter a tri-state mode and V BUS (or V BUS and V TRM ) consumes less than 20µA of supply current. D+ and D- withstand external signals up to +5.5V in disable mode (Table 2).Sharing ModeConnect V L to a system power supply and leave V BUS (or V BUS and V TRM ) unconnected or connect to G ND.D+ and D- enter a tri-state mode, allowing other circuitry to share the USB D+ and D- lines, and V L consumes less than 20µA of supply current. D+ and D- withstand external signals up to +5.5V in sharing mode (Table 2).±15kV ESD-Protected USB TransceiversDevice ControlOEOE controls the direction of communication. Drive OE low to transfer data from the logic side to the USB side.For OE = low, VP and VM serve as differential driver inputs to the USB transmitter.Drive OE high to transfer data from the USB side to the logic side. For OE = high, VP and VM serve as single-ended receiver outputs from the USB inputs (D+ and D-). RCV serves as a differential receiver out-put, regardless of the state of OE .ENUM (MAX3451E)The MAX3451E features an enumerate function that allows software control of USB enumeration. USB proto-col requires a 1.5k Ωpullup resistor to D+ or D- to indi-cate the transmission speed to the host (see the SPD section). The MAX3451E provides an internal 1.5k Ωpullup resistor. Remove the pullup resistor from the cir-cuit to simulate a device disconnect from the USB. Drive ENUM low to disconnect the internal pullup resistor.Drive ENUM high to connect the internal pullup resistor.The SPD state determines whether the pullup resistor connects to D+ or D-. For ENUM = high, the internal 1.5k Ωpullup resistor connects to D+ when SPD = V L (full speed) or to D- when SPD = GND (low speed).SPDSPD sets the transceiver speed. Connect SPD to G ND to select the low-speed data rate (1.5Mbps). Connect SPD to V L to select the full-speed data rate (12Mbps).The MAX3451E provides an internal pullup resistor for selecting the bus speed. The MAX3450E and MAX3452E require an external pullup resistor to D+ or D- to set the bus speed. Connect the 1.5k Ωresistor between D+ and V TRM to set the full-speed (12Mbps)data rate, or connect the 1.5k Ωresistor between D- and V TRM to set the low-speed (1.5 Mbps) data rate.SUSThe SUS state determines whether the MAX3450E/MAX3451E/MAX3452E operate in normal mode or in suspend mode. Connect SUS to GND to enable normal operation. Drive SUS high to enable suspend mode.RCV asserts low and VP and VM remain active in sus-pend mode (Tables 3 and 4). Supply current decreases in suspend mode (see the Electrical Characteristics ).MAX3450E/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers_______________________________________________________________________________________9Figure 1. Rise and Fall TimesM A X 3450E /M A X 3451E /M A X 3452EBD (MAX3452E)The push-pull bus detect (BD) output monitors V BUS and asserts high if V BUS is greater than +4.0V. BD asserts low if V BUS is less than +3.6V and the MAX3452E enters sharing mode (Table 2).V TRMAn internal linear regulator generates the V TRM voltage (+3.3V typ). V TRM derives power from V BUS (see the Power-Supply Configurations section). V TRM powers the internal portions of the USB circuitry and provides the pullup voltage for an external USB pullup resistor MAX3450E/MAX3452E. Bypass V TRM to GND with a 1µF ceramic capacitor as close to the device as possible.Do not use V TRM to provide power to external circuitry.D+ and D-D+ and D- serve as bidirectional bus connections and are ESD protected to ±15kV (Human Body Model). For OE = low, D+ and D- serve as transmitter outputs. For OE = high, D+ and D- serve as receiver inputs. V BUSFor most applications, V BUS connects to the V BUS ter-minal on the USB connector. V BUS can also connect to an external supply as low as +3.1V (MAX3450E and MAX3451E). See the Power-Supply Configurations sec-tion. Drive V BUS low to enable sharing mode. Bypass V BUS to GND with a 0.1µF ceramic capacitor as close to the device as possible.External ComponentsExternal ResistorsProper USB operation requires two external resistors,each 24.3Ω±1%, 1/8W (or greater). Install one resistor in series between D+ of the MAX3450E/MAX3451E/MAX3452E and D+ on the USB connector. Install the other resistor in series between D- of the MAX3450E/MAX3451E/MAX3452E and D- on the USB connector (see the Typical Operating Circuit ).The MAX3450E/MAX3452E requires an external 1.5k Ωpullup resistor between V TRM and D+ or D- to set the bus speed.External CapacitorsThe MAX3450E/MAX3451E/MAX3452E require three external capacitors for proper operation. Bypass V L to G ND with a 0.1µF ceramic capacitor. Bypass V BUS to G ND with a 0.1µF ceramic capacitor. Bypass V TRM to GND with a 1µF (min) ceramic capacitor. Install all capac-itors as close to the device as possible.Data TransferTransmitting Data to the USBThe MAX3450E/MAX3451E/MAX3452E transmit data to the USB differentially on D+ and D-. VP and VM serve as differential input signals to the driver (Tables 3a and 3b).Receiving Data from the USBTo receive data from the USB, drive OE high and SUS low. Differential data received by D+ and D- appears as a differential logic signal at RCV. Single-ended receivers on D+ and D- drive VP and VM, respectively (Tables 4a and 4b).±15kV ESD-Protected USB Transceivers 10______________________________________________________________________________________Figure 2. Timing of VP and VM to D+ and D-MAX3450E/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers______________________________________________________________________________________11Figure 3. Enable and Disable Timing, DriverFigure 4. Timing of D+ and D- to RCV, VM, and VPFigure 5. Enable and Disable Timing, ReceiverFigure 6. Test CircuitsM A X 3450E /M A X 3451E /M A X 3452EESD ProtectionD+ and D- possess extra protection against static elec-tricity to protect the devices up to ±15kV. The ESD structures withstand high ESD in all operating modes:normal operation, suspend mode, and powered down.D+ and D- provide protection to the following limits:•±15kV using the Human Body Model•±8kV using the Contact Discharge method specified in IEC 1000-4-2ESD 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 7 shows the Human Body Model and Figure 8shows the current waveform generated when dis-charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter-est, which then discharges into the test device through a 1.5k Ωresistor.IEC 1000-4-2The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment. It does not specifi-cally refer to integrated circuits. The major difference between tests done using the Human Body Model and IEC 1000-4-2 is a higher peak current in IEC 1000-4-2,due to lower series resistance. Hence, the ESD with-stand voltage measured to IEC 1000-4-2 generally is lower than that measured using the Human Body Model. Figure 9 shows the IEC 1000-4-2 model. The Contact Discharge method connects the probe to the device before the probe is charged.Machine ModelThe Machine Model for ESD tests all connections using a 200pF storage capacitor and zero discharge resis-tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just inputs and outputs. After PC board assembly, the Machine Model is less relevant to I/O ports.±15kV ESD-Protected USB Transceivers 12______________________________________________________________________________________Figure 8. Human Body Model Current WaveformFigure 7. Human Body ESD Test ModelsFigure 9. IEC 1000-4-2 ESD Test ModelMAX3450/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers______________________________________________________________________________________13Typical Operating CircuitChip InformationTRANSISTOR COUNT: 873PROCESS: BiCMOSM A X 3450/M A X 3451E /M A X 3452E±15kV ESD-Protected USB Transceivers 14______________________________________________________________________________________Package 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 .)MAX3450/MAX3451E/MAX3452E±15kV ESD-Protected USB Transceivers______________________________________________________________________________________15Package 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 3450/M A X 3451E /M A X 3452E±15kV ESD-Protected USB Transceivers 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©2003 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 .)。

max3485中文资料

max3485eesa + T概述Max3485eesa + T是3.3V电源±15kV ESD保护，真正的RS485 / RS422收发器，采用8引脚nsoic封装。

该低功耗收发器包含一个驱动器和一个接收器。

max3485e传输速率高达15Mbps。

它具有增强的静电保护。

所有发送器输出和接收器输入均具有±15kV保护，并通过IEC 1000-4-2气隙放电；±8Kv保护是通过IEC 1000-4-2接触放电，±15kV保护是通过人体模型。

驱动器受到短路电流的限制，并通过将驱动器输出置于高阻抗状态的热关断电路来防止过多的功耗。

接收器输入具有故障安全功能，如果两个输入均打开，则提供逻辑高电平输出。

Max3485e适用于EMI敏感应用，集成服务，数字网络和数据包交换电源电压范围：3V至3.6V工作温度范围-40°C至85°C半双工通讯该操作由单个+ 3.3V电源供电，无电荷泵兼容+ 5V逻辑2Na小电流关闭模式共模输入电压范围：-7V至+ 12V工业标准75176引脚输出驱动器/接收器启用功能工业控制LAN，ISDN，低功耗RS-485 / RS-422收发器;分组交换;电信;用于EMI敏感应用的收发器Max3483，max3485，max3486，max3488，max3490和max3491是用于RS-485和RS-422通信的3.3V低功耗收发器，每个收发器都有一个驱动器和一个接收器。

Max3483和max3488具有有限速率驱动器，可以降低EMI并减少由于端子匹配电缆不合适而引起的反射，从而实现高达250kbps的无错误数据传输。

由于其有限的摆幅速率，Max3486可以实现最大2.5mbps 的传输速率。

Max3485，max3490和max3491可以实现高达10Mbps的传输速率。

驱动器具有短路电流限制，并且可以通过热关断电路将驱动器的输出设置为高阻状态，以防止过多的功率损耗。

MAX3353EEBP-T中文资料

General DescriptionThe MAX3353E I 2C™-compatible USB On-the-G o (OTG ) regulated charge pump with switchable pullup/pulldown resistors allows peripherals and mobile devices such as PDAs, cellular phones, and digital cameras to be interconnected without a host PC.The MAX3353E enables a system with an integrated USB dual-role transceiver to function as a USB OTG dual-role device. The charge pump in the MAX3353E supplies V BUS power and signaling that is required by the transceiver as defined in On-the-Go Supplement:USB 2.0, R evision 1.0. The MAX3353E provides the switchable pullup and pulldown resistors on D+ and D-required for a dual-role device.The MAX3353E integrates a regulated charge pump,switchable pullup/pulldown resistors, and an I 2C-com-patible 2-wire serial interface. The device provides a detector to monitor ID status and operates with logic supply voltages (V L ) between +1.65V and V CC and charge-pump supply voltages (V CC ) from +2.6V to +5.5V. The charge pump supplies an OTG-compatible output on V BUS while sourcing 8mA output current.The MAX3353E enables USB OTG communication between digital logic parts that cannot supply or tolerate the +5V V BUS levels that USB OTG requires. By control-ling and measuring V BUS using internal comparators,this device supports USB OTG session request protocol (SRP) and host negotiation protocol (HNP).The MAX3353E has built-in ±15kV ESD protection circuitry to guard V BUS , ID_IN, D+, and D-. The MAX3353E is available in a 5 x 4 chip-scale package (UCSP™) and 16-pin TSSOP package.ApplicationsMobile Phones PDAsDigital Cameras MP3 Players Photo PrintersFeatures♦Ideal for Enabling USB Dual-Role Components for USB OTG Protocol ♦Charge Pump for V BUS Signaling and Operation Down to +2.6V ♦Level Translators Allow Low-Voltage System Interface ♦Internal V BUS Comparators and ID Detector ♦Internal Switchable Pullup and Pulldown Resistors for Host/Peripheral Functionality ♦I 2C-Compatible Bus Interface with Command and Status Registers ♦Interrupt Features♦±15kV ESD Protection on ID_IN, V BUS , D+, and D-♦Supports SRP and HNP♦Available in 5 x 4 UCSP and 16-Pin TSSOPMAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown Resistors________________________________________________________________Maxim Integrated Products 1Functional DiagramOrdering Information19-2845; Rev 1; 10/03For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at .UCSP is a trademark of Maxim Integrated Products, Inc.Purchase of I 2C components from Maxim Integrated Products,Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I 2C Patent Rights to use these com-ponents in an I 2C system, provided that the system conforms to the I 2C Standard Specification as defined by Philips.Pin Configurations appear at end of data sheet.Typical Applications Circuit appears at end of data sheet.M A X 3353EUSB On-the-Go Charge Pump with Switchable Pullup/Pulldown Resistors 2_______________________________________________________________________________________ABSOLUTE MAXIMUM RATINGSELECTRICAL CHARACTERISTICS(V CC = +2.6V to +5.5V, V L = +1.65V to V CC , V TRM = +3V to +3.6V, C FLYING = 0.1µF, V CC decoupled with 1µF capacitor to ground;V TRM and V L decoupled with 0.1µF capacitor to ground; C VBUS = 1µF (min), T A = T MIN to T MAX , unless otherwise noted. Typical values are at V= +4V, V = +1.8V, V = +3.3V, and T = +25°C.) (Notes 3, 4)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.(All voltages referenced to GND.)V CC ,V L , V TRM ..........................................................-0.3V to +6V D+, D-, ID_IN (Note 1)..............................................-0.3V to +6V V BUS (Notes 1, 2).....................................................-0.3V to +6V C+..................................................................(V CC - 0.3V) to +6V C-................................................................-0.3V to (V CC + 0.3V)INT , ID_OUT..................................................-0.3V to (V L + 0.3V)SDA, SCL, ADD .......................................................-0.3V to +6V V BUS Output Short Circuit to Ground .......................Continuous Output Current (all other pins) .........................................±15mA Continuous Power Dissipation (T A = +70°C)16-Pin TSSOP (derate 9.4mW/°C above +70°C).........755mW 5 x 4 UCSP (derate 7.8mW/°C above +70°C).............625mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range.............................-65°C to +150°C Junction Temperature......................................................+150°C Lead Temperature (soldering 10s) .................................+300°C Bump Temperature (soldering)Infrared (15s)...............................................................+200°C Vapor Phase (20s).......................................................+215°CNote 1:15kV ESD protected.Note 2:V BUS can be backdriven to +6V.MAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown ResistorsELECTRICAL CHARACTERISTICS (continued)(V CC = +2.6V to +5.5V, V L = +1.65V to V CC , V TRM = +3V to +3.6V, C FLYING = 0.1µF, V CC decoupled with 1µF capacitor to ground;V TRM and V L decoupled with 0.1µF capacitor to ground; C VBUS = 1µF (min), T A = T MIN to T MAX , unless otherwise noted. TypicalM A X 3353EUSB On-the-Go Charge Pump with Switchable Pullup/Pulldown ResistorsELECTRICAL CHARACTERISTICS (continued)(V CC = +2.6V to +5.5V, V L = +1.65V to V CC , V TRM = +3V to +3.6V, C FLYING = 0.1µF, V CC decoupled with 1µF capacitor to ground;V TRM and V L decoupled with 0.1µF capacitor to ground; C VBUS = 1µF (min), T A = T MIN to T MAX , unless otherwise noted. Typical TIMING CHARACTERISTICS(V CC = +2.6V to +5.5V, V L = +1.65V to V CC , V TRM = +3V to +3.6V, C FLYING = 0.1µF, V CC decoupled with 1µF capacitor to ground.V TRM and V L decoupled with 0.1µF capacitor to ground. C VBUS = 1µF (min), T A = T MIN to T MAX , unless otherwise noted. Typical val-ues are at T = +25°C, V = +4V, V = +1.8V, V = +3.3V.) (Notes 3, 4)MAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown Resistors_______________________________________________________________________________________5TIMING CHARACTERISTICS (continued)(V CC = +2.6V to +5.5V, V L = +1.65V to V CC , V TRM = +3V to +3.6V, C FLYING = 0.1µF, V CC decoupled with 1µF capacitor to ground.V TRM and V L decoupled with 0.1µF capacitor to ground. C VBUS = 1µF (min), T A = T MIN to T MAX , unless otherwise noted. Typical val-(V CC = +2.6V to +5.5V, V L = +1.65V to V CC , V TRM = +3V to +3.6V, C FLYING = 0.1µF, V CC decoupled with 1µF capacitor to ground.ground unless otherwise specified.Note 4:Parameters are 100% production tested at +25°C, limits over temperature are guaranteed by design.Note 5:The V BUS current source and current gate time vary together with process and temperature such that the resulting V BUSpulse is guaranteed to drive a <13µF load to a voltage >2.0V, and to drive a >96µF load to a volatge <2.2V.See the SRP V BUS Pulsing section for an explanation of this self-timed pulse.Note 6:Guaranteed by design, not production tested.Note 7:A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s fallingedge.Note 8:C B is total capacitance of one bus line in pF. Tested with C B = 400pF.Note 9:Input filters on SDA, SCL, and ADD suppress noise spikes less than 50ns.M A X 3353EUSB On-the-Go Charge Pump with Switchable Pullup/Pulldown Resistors 6_______________________________________________________________________________________Typical Operating Characteristics(V CC = +3V, V L = +2.5V, C FLYING = 0.1µF, C VBUS = 1µF (ESR CVBUS = 0.1Ω), T A = +25°C.)040208060100120050INPUT CURRENT vs. OUTPUT CURRENTOUTPUT CURRENT (mA)I N P U T C U R R E N T (m A )201030404.004.504.254.755.005.25050V BUS OUTPUT VOLTAGE vs. V BUS OUTPUT CURRENTOUTPUT CURRENT (mA)V B U S O U T P U T V O L T A G E (V )201030404.704.804.754.854.902.5V BUS OUTPUT VOLTAGE vs. INPUT VOLTAGEINPUT VOLTAGE (V)V B U S O U T P U T V O L T A G E (V )4.03.53.05.04.55.5MAX3353 toc04200μs/div I CC5mA/divSCL 5V/div TIME TO ENTER SHUTDOWNMAX3353 toc05100μs/div I CC10mA/divSCL 5V/divTIME TO EXIT SHUTDOWN40ms/divV BUS 1V/divV BUS 1V/divC L = 10μFC L = 96μFV BUS WITH CAPACITIVE LOAD65.067.066.566.065.567.568.0-4085V BUSINPUT IMPEDANCE vs. TEMPERATURETEMPERATURE (°C)V B U S I N P U T I M P E D A N C E (k Ω)10-1535601618171920-4085SUPPLY CURRENT vs. TEMPERATURETEMPERATURE (°C)S U P P L Y C U R R E N T (m A )10-153560Detailed Description The MAX3353E integrates a regulated charge pump, switchable pullup/pulldown resistors, and an I2C-compatible 2-wire serial interface. The internal level shifter allows the device to operate with logic supply volt-ages (V L) between +1.65V and V CC. The MAX3353E’s OTG-compliant charge pump operates with input supply voltages (V CC) from +2.6V to +5.5V and supplies an OTG-compatible output on V BUS while sourcing 8mA output current.The MAX3353E level-detector comparators monitor impor-tant V BUS voltages needed to support SRP and HNP and provides an interrupt output signal for OTG events that require action. The V BUS power-control block performs the various switching functions required by an OTG dual-role device and is programmable by system logic.For OTG operation, D+ and D- are connected to switch-able pulldown resistors (host) and switchable pullup resistors (peripheral) controlled by internal registers.The MAX3353E’s OTG-compliant charge-pump operateswith input supply voltages (V CC) from +2.6V to +5.5Vand supplies an OTG-compatible output on V BUS withthe capability of sourcing 8mA (min) output current.When V BUS is not providing power, an input impedanceof no more than 100kΩand no less than 40kΩto GND is present on V BUS. When V BUS provides power, the risetime on V BUS from 0 to 4.4V is no longer than 100mswhen driving a constant current load of 8mA and an external load capacitance of 13µF.During a continuous short circuit on V BUS,the charge-pump output is current limited to 140mA (typ). Thermal-shutdown circuitry turns off the charge pump if the die temperature exceeds +150°C and restarts when the diecools to 140°C.Level Shifters Internal level shifters allow the system-side interface torun at logic supply voltages as low as 1.65V. Interfacelogic signals are referenced to the voltage applied to V L.MAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown Resistors _______________________________________________________________________________________7M A X 3353EV BUS Level-Detection ComparatorsComparators drive status register bits 0, 1, and 2 to indicate these important USB OTG V BUS voltage levels:•V BUS is valid (V BUS > 4.6V)• A USB session is valid (V BUS > 1.4V)• A USB session is ended (V BUS < 0.5V)The 4.6V comparator sets bit 0 in status register V BUS_VALID to 1 if V BUS > 4.6V. The A Device uses the V BUS valid status bit (V BUS_VALID ) to determine if the B Device is sinking too much current (i.e., is not supported).The interrupt can be associated to either a positive or a negative transition. The 1.4V comparator sets bit 1 of sta-tus register SESSION_VALID to 1 if V BUS > 1.4V. This sta-tus bit indicates that a data transfer session is valid and the interrupt can be associated to either a positive or a negative transition. The session-end comparator sets bit 2 in the status register SESSION_END to a 1 when V BUS < 0.5V, and generates an interrupt when V BUS falls below 0.5V. Figure 1 shows the level-detector comparators.Interrupt LogicWhen OTG events require action, the MAX3353E pro-vides an interrupt output signal on INT . An interrupt is triggered (INT goes low) when one of the conditions specified by the interrupt-mask register and interrupt-edge register is verified. INT stays active until the inter-rupt is cleared by reading the interrupt latch register.ShutdownIn shutdown mode, the MAX3353E’s quiescent current is reduced to less than 2µA. Bit 0 in control register 2controls the shutdown feature. Setting bit 0 = 1 places the device in shutdown mode (Figure 2, Table 5). When in shutdown, the MAX3353E’s charge-pump current generator and V BUS detection comparators are turned off. During shutdown, the I 2C serial interface is fully functional and registers can be read from or written to.ID_IN and ID_OUT are both functional in shutdown.V BUS Power ControlV BUS is a dual-function I/O that can supply USB OTG-compliant voltage to the USB. The V BUS power-control block performs the various switching functions required by an OTG dual-role device. This action is programmed by the system logic using internal register control bits in control register 2.•Discharge V BUS through a resistor to ensure a ses-sion is not in progress.•Charge V BUS through an internal current generator to initiate SRP (session request protocol).•Connect the charge pump to V BUS to provide power on V BUS .Bit 0 (SDWN) in control register 2 is used to place the MAX3353E in normal operation or shutdown mode.Setting bit 1 (V BUS_CHG1) issues a timed pulse on V BUS suitable for implementing the session request protocol (see the SRP V BUS Pulsing section). The pulse is created by turning a current source – supplied by V CC and con-nected to V BUS – on and off. Setting control register bit 2 (V BUS_CHG2) to 1 charges VBUS through the current source continuously. Setting V BUS_CHG2to zero discon-nects the current source. Bit 3 (V BUS_DRV ) turns theUSB On-the-Go Charge Pump with Switchable Pullup/Pulldown Resistors 8_______________________________________________________________________________________Figure 1. Comparator Network DiagramFigure 2. Power-Control Block Diagramcharge pump on and off to power V BUS. Bit 4 in control register 2 (V BUS_DISCHG) is used to discharge V BUS through a 5kΩresistor. Figure 2 and Table 2 show power control.Autoconnect and Autoresponse USB OTG defines the HNP, where the default host (A Device) can pass the host responsibilities off to the default peripheral (B Device). This protocol can be han-dled entirely by the firmware and controlling logic that dri-ves the OTG transceiver. The MAX3353E has the option to automatically perform some of the required signaling for some of the timing-critical events in the HNP process. The automatic signaling used by the A Device, when it transfers host control to the B Device, is defined by the OTG transceiver supplement and is known as autocon-nect. Autoconnect allows the transceiver to automatically connect the A Device’s D+ pullup resistor during HNP. Autoconnect is enabled when the MAX3353E is config-ured as an A Device (ID_IN = 0) and the BDISC_ACONN control bit is set.The MAX3353E also has the capability to automate the signaling used by the B Device when it assumes host control from the A Device. This autoresponse is not speci-fied by the OTG-transceiver supplement. Autoresponse causes the B Device to automatically assert a bus reset by driving a single-ended zero (SE0: both D+ and D- dri-ven low) onto USB in response to the A Device connect-ing its D+ pullup resistor. Autoresponse is enabled when the MAX3353E is configured as a B Device and the BDISC_ACONN control bit is set.Note: In a system, D+ and D- are also driven by a trans-ceiver in an ASIC or other device. The autoresponse mode should not be used unless the system designer can ensure that there is no bus conflict between the transceiver and the MAX3353E driving USB to SE0.Autoconnect Details When the MAX3353E is configured as an A Device (ID_IN = G ND), it can enable autodetect by setting BDISC_ACONN to one. This should be done after the USB is in the suspend state (>3ms with no traffic). The MAX3353E monitors D+/D- for an SE0. The presence of the SE0 indicates that the B Device has disconnected its pullup resistor, the first step in HNP. When SE0 is detected, the MAX3353E automatically turns on its internal pullup resistor to the D+ line within 3ms. There are two ways for firmware to ascertain that the MAX3353E has automatically turned on its D+ pullup during HNP:1)The A_HNP status bit goes high when the D+ pullupis automatically connected during HNP 2)The A_HNP_EN control bit is set, and an interrupt isissued as the D+ pullup is connected (see also theInterrupt Logic section).By clearing BDISC_ACONN bit, the D+ pullup is discon-nected. After a successful autoconnect operation, the firmware should set the DP_PULLUP control bit before clearing the BDISC_ACONN bit; this ensures that theD+ pullup remains connected.Note:The autoconnect works only if MAX3353E is notin shutdown.Autoresponse DetailsWhen the MAX3353E is configured as a B Device(ID_IN = open), setting the BDISC_ACONN control bit enables the autoresponse feature. Using this feature,the MAX3353E automatically issues a USB bus resetwhen the A Device becomes a peripheral. Firmwarecan take advantage of the autoresponse feature of theMAX3353E by doing the following:•Ensure that the system transceiver is in USB-sus-pend mode. Wait until the USB-suspend conditionsare met (no USB activity for >3ms). Enable auto-response. Set the BDISC_ACONN control bit. Signala USB disconnect. Firmware clears the DP_PULLUPcontrol bit, which disconnects the D+ pullup resis-tor. At this point, the MAX3353E waits at least 25µsbefore enabling its internal USB line monitor todetect if the A Device has attached its D+ pullup;this ensures that the D+ line is not high due to theresidual effect of the B Device pullup. When the ADevice has connected its D+ pullup, the MAX3353Eissues a bus reset (SE0) and the B_HNP status bitgoes high.•Wait for B_HNP to go high; output SE0 from the ASIC or other device on D+/D-. Disable autore-sponse. By clearing BDISC_ACONN bit, the SE0generator is turned off. The SE0 is maintained by thesystem USB transceiver.Note:The autoresponse works only if the MAX3353E isnot in shutdown.SRP V BUS Pulsing Session request protocol (SRP) is designed to allowthe A Device (default host) to conserve power by turn-ing off V BUS when there is no USB traffic. The B Device (default peripheral) can request the A Device to turnV BUS on and initiate a new session through SRP.The B Device must initiate SRP in two ways: data-lineand V BUS pulsing. Firmware is responsible for turningon and off the pullup resistor on D+ to implementdata-line pulsing. Firmware can also be used to turn onand off a current source to implement V BUS pulsing.MAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown Resistors _______________________________________________________________________________________9M A X 3353EThe MAX3353E also has a special feature that allows it to control the timing of the V BUS pulse.Since an OTG device could be plugged into a PC, the V BUS pulse must be particularly well controlled to prevent damage to a PC host. For this reason, V BUS pulsing is done by turning on and off a current source. The V BUS pulse must be timed so it drives a 13µF load (when it is connected to the A Device) to a voltage greater than 2.1V, and it drives a >96µF load (when it is connected to a standard PC) to a voltage less than 2.0V.Firmware can control the current source and the timing of the V BUS pulse through the V BUS_CHG2control bit.The MAX3353E also has the capability to time the pulseitself. Firmware initiates the self-timed V BUS pulse bysetting the V BUS_CHG1control bit to 1.The internal timer and current generator guarantee that the V BUS voltage goes above 2.1V if C VBUS <13µF within 90ms and stands below 2.0V if C VBUS >96µF.Once the time has elapsed, if another V BUS pulse is required, it is necessary to clear the V BUS_CHG1bit and then set it again.Note: SRP V BUS pulsing and its associated current gen-erator work only if the MAX3353E is not in shutdown.Data-Line Pullup and Pulldown ResistanceFor OTG operation, D+ and D- are connected to switch-able pulldown resistors (host) and switchable pullup resistors (peripheral). Data-line pullup/pulldown resistors are individually controlled through data bits 4 through 7 in control register 1. Two 15k Ωpulldown resistors allow the device to be set as a host and are asserted by bits 6 and 7. The 1.5k Ωpullup resistor is applied to the data lines through SW1 and SW2, which are controlled by bits 4 and 5. D+ pullup has higher priority to avoid direct connection of D+ and D-. Each of the control bits controls a designat-ed switch; therefore, pullup and pulldown switches can be asserted at the same time. A simplified schematic of the switching network is shown in Figure 3.The bidirectional D+ and D- lines are ESD protected to ±15kV, reducing external components in many applications.Applications Information2-Wire I 2C-Compatible Serial InterfaceA register file that interfaces to the control logic uses a simple 2-wire interface operating up to 400kHz to con-trol the various switches and modes.Serial AddressingThe MAX3353E operates as a slave that sends and receives control and status signals through an I 2C-compatible 2-wire interface. The interface uses a serial data line (SDA) and a serial clock line (SCL) to achieveUSB On-the-Go Charge Pump with Switchable Pullup/Pulldown Resistorsbidirectional communication between master(s) and slave(s). A master (typically a microcontroller) initiates all data transfers to and from the MAX3353E and gen-erates the SCL clock that synchronizes the data trans-fer (Figure 4).The MAX3353E SDA line operates as both an input and an open-drain output. A pullup resistor (4.7kΩtyp) is required on SDA. The MAX3353E SCL line operates only as an input. A pullup resistor (4.7kΩtyp) is required on SCL if there are multiple masters on the 2-wire interface, or if the master in a single-master system has an open-drain SCL output.Each transmission consists of a START condition (Figure 5) sent by a master, followed by the MAX3353E 7-bit slave address plus R/W bit (Figure 6), a register address byte, one or more data bytes, and finally a STOP condition (Figure 5).Start and Stop Conditions Both SCL and SDA remain high when the interface is not busy. A master signals the beginning of a transmis-sion with a START (S) condition by transitioning SDA from high to low while SCL is high. When the master has finished communicating with the slave, it issues a STOP (P) condition by transitioning the SDA from low to high while SCL is high. The bus is then free for another transmission (Figure 5).Bit Transfer One data bit is transferred during each clock pulse. The data on the SDA line must remain stable while SCL is high (Figure 7).Acknowledge The acknowledge bit is the clocked ninth bit that the recipient uses to handshake receipt of each byte of data (Figure 8). Thus, each byte transferred effectively requires 9 bits. The master generates the 9th clock pulse, and the recipient pulls down SDA during the acknowledge clock pulse, such that the SDA line is sta-ble low during the high period of the clock pulse. When the master is transmitting to the MAX3353E, theMAX3353E generates the acknowledge bit because itis the recipient. When the MAX3353E is transmitting tothe master, the master generates the acknowledge bit because the master is the recipient.Slave AddressThe MAX3353E has a 7-bit-long slave address. The eighth bit following the 7-bit slave address is the R/Wbit. It is low for a write command, high for a read com-mand. The first 6 bits (MSBs) of the MAX3353E slave address are always 010110. Select slave address bitA0 by connecting the address input ADD to V L, GND,or leave floating (ADD is internally pulled to G ND through a 110kΩresistor). The MAX3353E has two pos-sible slave addresses (Table 1). As a result, only twoMAX3353E devices can share the same interface.Write Byte FormatA write to the MAX3353E comprises the transmission ofthe MAX3353E’s slave address with the R/W bit set to zero, followed by 2 bytes of information. The first byteof information is the command byte that determineswhich register of the MAX3353E is to be written by the second byte. The second byte is the data that goes intothe register that is set by the first byte. Figure 9 showsthe typical write byte format.Read Byte FormatA read from the MAX3353E comprises the transmissionof the MAX3353E’s slave address (from the master)with the R/W bit set to zero, followed by one byte con-taining the address of the register, from which the mas-ter is going to read data, and then followed byMAX3353E’s slave address again with the R/W bit setto one. After that one byte of data is being read by the master. Figure 10 shows the read byte format that mustbe used. To read many contiguous registers, multiple accesses are required.RegistersControl Registers (10h, 11h)There are two read/write control registers. Control reg-ister 1 is used to set D+, D- pullup or pulldown, and toset interrupt output to open-drain or push-pull. Control register 2 is the bus control register used to control thebus operation and put the device into shutdown mode. (Tables 3, 4, and 5.)Status Register (13h)The status register is a read-only register for determiningvalid bus and session comparator thresholds, ID_IN sta-tus, and HNP success. Tables 6 and 7 show status regis-ter address map, bit configuration, and description.MAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown ResistorsFigure 5. Start and Stop ConditionsM A X 3353EUSB On-the-Go Charge Pump with Switchable Pullup/Pulldown ResistorsMAX3353EUSB On-the-Go Charge Pump with SwitchablePullup/Pulldown ResistorsM A X 3353Einterrupt edge, and interrupt latch address maps. Bit configuration is shown in Tables 9, 10, and 11.Manufacturer and ID Register Address MapThe manufacturer and ID registers are read-only regis-ters (Table 12).External CapacitorsFive external capacitors are recommended for proper operation. Bypass V L and V TRM to GND with a 0.1µF ceramic capacitor. Bypass V BUS and V CC to GND with a 1µF low-ESR ceramic capacitor. For the internal charge pump, use a 0.1µF ceramic capacitor between C+ and C-.USB On-the-Go Charge Pump with Switchable Pullup/Pulldown Resistors。