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MAX485ESA中文资料 MAX485ESA数据手册pdf下载

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MAX481MAX483MAX485 MAX487MAX491MAX1487 LowPower SlewRateLimited RS485RS422 Transceivers Next Generation Device Features o For FaultTolerant Applications MAX3430 80V FaultProtected FailSafe 14 Unit Load 33V RS485 Transceiver MAX3440EMAX3444E 15kV ESDProtected 60V FaultProtected 10Mbps FailSafe RS485J1708 Transceivers o For SpaceConstrained Applications MAX3460MAX3464 5V FailSafe 20Mbps Profibus RS485RS422 Transceivers MAX3362 33V HighSpeed RS485RS422 Transceiver in a SOT23 Package MAX3280EMAX328......

MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers __Next Generation Device Features o For Fault-Tolerant Applications MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit 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-422 Transceiver 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-422 Transceivers o For Low-Voltage Applications MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E: +3.3V Powered, ±15kV ESD-Protected, 12Mbps, Slew-Rate-Limited, True RS-485/RS-422 Transceivers Ordering Information appears at end of data sheet. General Description The MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are low-power transceivers for RS-485 and RS- 422 communication. Each part contains one driver and one receiver. The MAX483, MAX487, MAX488, and MAX489 feature reduced slew-rate drivers that minimize EMI and reduce 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 to transmit up to 2.5Mbps. These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume only 0.1µA. All parts operate from a single 5V supply. Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-imped- ance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/ MAX1487 transceivers on the bus. Full-duplex communi- cations are obtained using the MAX488–MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are 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 ______________________________________________________________Selection Table PART NUMBER HALF/FULL DUPLEX DATA RATE (Mbps) SLEW-RATE LIMITED LOW- POWER SHUTDOWN RECEIVER/ DRIVER ENABLE MAX481 MAX483 MAX485 MAX487 MAX488 MAX489 MAX490 MAX491 MAX1487 Half Half Half Half Full Full Full Full Half 2.5 0.25 2.5 0.25 0.25 0.25 2.5 2.5 2.5 No Yes No Yes Yes Yes No No No Yes Yes No Yes No No No No No Yes Yes Yes Yes No Yes No Yes Yes QUIESCENT CURRENT NUMBER OF RECEIVERS ON (μA) 300 120 300 120 120 120 300 300 230 BUS 32 32 32 128 32 32 32 32 128 PIN COUNT 8 8 8 8 8 14 8 14 8 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. 19-0122; Rev 10; 9/14 MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC).............................................................12V Control Input Voltage (RE, DE)...................-0.5V to (VCC + 0.5V) Driver Input Voltage (DI).............................-0.5V to (VCC + 0.5V) Driver Output Voltage (A, B)...................................-8V to +12.5V Receiver Input Voltage (A, B).................................-8V to +12.5V Receiver Output Voltage (RO)....................-0.5V to (VCC + 0.5V) Continuous Power Dissipation (TA = +70°C) 14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............830mW 8-Pin CERDIP (derate 8.00mW/°C above +70°C).........640mW 14-Pin CERDIP (derate 9.09mW/°C above +70°C).......727mW Operating Temperature Ranges 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ....727mW 14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) ..800mW 8-Pin SO (derate 5.88mW/°C above +70°C).................471mW MAX4_ _C_ _/MAX1487C_ A ...............................0°C to +70°C MAX4_ _E_ _/MAX1487E_ A.............................-40°C to +85°C MAX4_ _M_/MAX1487MJA .............................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°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. DC ELECTRICAL CHARACTERISTICS (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Driver Output (no load) Differential Driver Output (with load) Change in Magnitude of Driver Differential Output Voltage for Complementary Output States Driver Common-Mode Output Voltage Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States Input High Voltage Input Low Voltage Input Current Input Current (A, B) Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage Three-State (high impedance) Output Current at Receiver VOD1 VOD2 R = 50Ω (RS-422) R = 27Ω (RS-485), Figure 4 ΔVOD R = 27Ω or 50Ω, Figure 4 VOC R = 27Ω or 50Ω, Figure 4 ΔVOD R = 27Ω or 50Ω, Figure 4 VIH VIL IIN1 IIN2 VTH ΔVTH VOH VOL IOZR DE, DI, RE DE, DI, RE DE, DI, RE DE = 0V; VCC = 0V or 5.25V, all devices except MAX487/MAX1487 MAX487/MAX1487, DE = 0V, VCC = 0V or 5.25V -7V ≤ VCM ≤ 12V VCM = 0V IO = -4mA, VID = 200mV IO = 4mA, VID = -200mV 0.4V ≤ VO ≤ 2.4V VIN = 12V VIN = -7V VIN = 12V VIN = -7V Receiver Input Resistance RIN -7V ≤ VCM ≤ 12V, all devices except MAX487/MAX1487 -7V ≤ VCM ≤ 12V, MAX487/MAX1487 2 1.5 2.0 -0.2 3.5 12 48 70 5 5 0.2 3 0.2 0.8 ±2 1.0 -0.8 0.25 -0.2 0.2 0.4 ±1 V V V V V V V µA mA mA V mV V V µA kΩ kΩ 2 Maxim Integrated MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers MAX UNITS DC ELECTRICAL CHARACTERISTICS (continued) (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN No-Load Supply Current (Note 3) ICC MAX488/MAX489, DE, DI, RE = 0V or VCC MAX490/MAX491, DE, DI, RE = 0V or VCC MAX481/MAX485, RE = 0V or VCC MAX1487, RE = 0V or VCC MAX483/MAX487, RE = 0V or VCC DE = VCC DE = 0V DE = VCC DE = 0V DE = 5V DE = 0V MAX483 MAX487 Supply Current in Shutdown Driver Short-Circuit Current, VO = High Driver Short-Circuit Current, VO = Low Receiver Short-Circuit Current ISHDN IOSD1 MAX481/483/487, DE = 0V, RE = VCC -7V ≤ VO ≤12V (Note 4) IOSD2 -7V ≤ VO ≤12V (Note 4) IOSR 0V ≤ VO ≤ VCC 35 35 7 TYP 120 300 500 300 300 230 350 250 120 0.1 250 500 900 500 500 400 650 400 250 10 250 250 95 µA µA mA mA mA UNITS ns ns ns ns ns ns ns ns ns ns ns ns ns SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL Driver Input to Output Driver Output Skew to Output Driver Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High tPLH tPHL tSKEW tR, tF tZH tZL tLZ tHZ Receiver Input to Output tPLH, tPHL | tPLH - tPHL | Differential Receiver Skew Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Maximum Data Rate Time to Shutdown tSKD tZL tZH tLZ tHZ fMAX tSHDN CONDITIONS Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF MAX481, MAX485, MAX1487 Figures 6 and 8, RDIFF = 54Ω, MAX490C/E, MAX491C/E CL1 = CL2 = 100pF MAX490M, MAX491M Figures 7 and 9, CL = 100pF, S2 closed Figures 7 and 9, CL = 100pF, S1 closed Figures 7 and 9, CL = 15pF, S1 closed Figures 7 and 9, CL = 15pF, S2 closed Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 5 and 11, CRL = 15pF, S1 closed Figures 5 and 11, CRL = 15pF, S2 closed Figures 5 and 11, CRL = 15pF, S1 closed Figures 5 and 11, CRL = 15pF, S2 closed MAX481, MAX485, MAX1487 MAX490C/E, MAX491C/E MAX490M, MAX491M MAX481 (Note 5) MIN 10 10 3 5 3 20 20 20 2.5 50 TYP 30 30 5 15 15 15 40 40 40 40 90 90 90 13 20 20 20 20 MAX 60 60 10 40 25 40 70 70 70 70 200 150 200 50 50 50 50 200 600 Mbps ns Maxim Integrated 3 MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers SWITCHING CHARACTERISTICS—MAX481/MAX485, MAX490/MAX491, MAX1487 (continued) (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Driver Enable from Shutdown to Output High (MAX481) Driver Enable from Shutdown to Output Low (MAX481) tZH(SHDN) Figures 7 and 9, CL = 100pF, S2 closed tZL(SHDN) Figures 7 and 9, CL = 100pF, S1 closed Receiver Enable from Shutdown to Output High (MAX481) tZH(SHDN) Figures 5 and 11, CL = 15pF, S2 closed, A - B = 2V Receiver Enable from Shutdown to Output Low (MAX481) tZL(SHDN) Figures 5 and 11, CL = 15pF, S1 closed, B - A = 2V 40 40 100 100 300 1000 300 1000 ns ns ns ns SWITCHING CHARACTERISTICS—MAX483, MAX487/MAX488/MAX489 (VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL Driver Input to Output Driver Output Skew to Output Driver Rise or Fall Time Driver Enable to Output High Driver Enable to Output Low Driver Disable Time from Low Driver Disable Time from High Receiver Input to Output I tPLH - tPHL I Differential Receiver Skew Receiver Enable to Output Low Receiver Enable to Output High Receiver Disable Time from Low Receiver Disable Time from High Maximum Data Rate Time to Shutdown Driver Enable from Shutdown to Output High Driver Enable from Shutdown to Output Low Receiver Enable from Shutdown to Output High Receiver Enable from Shutdown to Output Low tPLH tPHL tSKEW tR, tF tZH tZL tLZ tHZ tPLH tPHL tSKD tZL tZH tLZ tHZ fMAX tSHDN tZH(SHDN) tZL(SHDN) tZH(SHDN) tZL(SHDN) CONDITIONS Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 8, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 7 and 9, CL = 100pF, S2 closed Figures 7 and 9, CL = 100pF, S1 closed Figures 7 and 9, CL = 15pF, S1 closed Figures 7 and 9, CL = 15pF, S2 closed Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 6 and 10, RDIFF = 54Ω, CL1 = CL2 = 100pF Figures 5 and 11, CRL = 15pF, S1 closed Figures 5 and 11, CRL = 15pF, S2 closed Figures 5 and 11, CRL = 15pF, S1 closed Figures 5 and 11, CRL = 15pF, S2 closed tPLH, tPHL < 50% of data period MAX483/MAX487 (Note 5) MAX483/MAX487, Figures 7 and 9, CL = 100pF, S2 closed MAX483/MAX487, Figures 7 and 9, CL = 100pF, S1 closed MAX483/MAX487, Figures 5 and 11, CL = 15pF, S2 closed MAX483/MAX487, Figures 5 and 11, CL = 15pF, S1 closed MIN 250 250 250 250 250 300 300 250 250 250 50 TYP 800 800 100 100 20 20 20 20 200 MAX 2000 2000 800 2000 2000 2000 3000 3000 2000 2000 50 50 50 50 600 2000 2000 2500 2500 UNITS ns ns ns ns ns ns ns ns ns ns ns ns ns kbps ns ns ns ns ns 4 Maxim Integrated MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers NOTES FOR ELECTRICAL/SWITCHING CHARACTERISTICS Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 2: All typical specifications are given for VCC = 5V and TA = +25°C. Note 3: Supply current specification is valid for loaded transmitters when DE = 0V. Note 4: Applies to peak current. See Typical Operating Characteristics. Note 5: The MAX481/MAX483/MAX487 are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 50ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode (MAX481/MAX483/MAX487)section. __________________________________________Typical Operating Characteristics (VCC = 5V, TA = +25°C, unless otherwise noted.) OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE RECEIVER OUTPUT HIGH VOLTAGE vs. TEMPERATURE ) A m ( T N E R R U C T U P T U O ) V ( E G A T L O V W O L T U P T U O 45 40 35 30 25 20 15 10 5 0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1 0 - 1 8 4 X A M 0 0.5 1.0 1.5 2.0 2.5 OUTPUT LOW VOLTAGE (V) RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE IRO = 8mA 4 0 - 1 8 4 X A M -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) ) A m ( T N E R R U C T U P T U O ) A m ( T N E R R U C T U P T U O -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 0 90 80 70 60 50 40 30 20 10 0 2 0 - 1 8 4 X A M ) V ( E G A T L O V H G H T U P T U O I 1.5 2.0 3.0 2.5 4.0 OUTPUT HIGH VOLTAGE (V) 3.5 4.5 5.0 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE 5 0 - 1 8 4 X A M ) V ( E G A T L O V T U P T U O L A I T N E R E F F D I 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 DIFFERENTIAL OUTPUT VOLTAGE (V) 4.8 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.6 1.5 IRO = 8mA 3 0 - 1 8 4 X A M -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs. TEMPERATURE R = 54Ω 6 0 - 1 8 4 X A M -50 -25 0 25 50 75 100 125 TEMPERATURE (°C) M A X 4 8 1 / M A X 4 8 3 / M A X 4 8 5 / M A X 4 8 7 – M A X 4 9 1 / M A X 1 4 8 7 Maxim Integrated 5
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