|Category||Interface and Interconnect => RS-485/RS-422|
|Description||Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers
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.
|Company||Maxim Integrated Products|
|Datasheet||Download MAX1487 datasheet
|Cross ref.||Similar parts: ADM1487E|
The MAX485, MAX487MAX491, and MAX1487 are low-power transceivers for RS-485 and RS422 communication. Each part contains one driver and one receiver. The 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 to 250kbps. The driver slew rates of the MAX490, MAX491, and MAX1487 are not limited, allowing them to transmit 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-impedance 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 MAX487/ MAX1487 transceivers on the bus. Full-duplex communications are obtained using the MAX488MAX491, while the MAX485, MAX487, and MAX1487 are designed for half-duplex applications.
For Fault-Tolerant Applications MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver MAX3440EMAX3444E: ±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers For Space-Constrained Applications MAX3460MAX3464: +5V, Fail-Safe, 20Mbps, Profibus RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver a SOT23 Package MAX3280EMAX3284E: ±15kV ESD-Protected, SOT23, RS-485/RS-422, True Fail-Safe Receivers SOT23, RS-855/RS-422 Transmitters For Multiple Transceiver Applications MAX3030EMAX3033E: ±15kV ESD-Protected, +3.3V, Quad RS-422 Transmitters For Fail-Safe Applications MAX3080MAX3089: Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers For Low-Voltage Applications MAX3490E/MAX3491E: +3.3V Powered, ±15kV ESD-Protected, 12Mbps, Slew-Rate-Limited, True RS-485/RS-422 Transceivers
Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers Level Translators Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks
PART NUMBER MAX491 MAX1487 HALF/FULL DUPLEX Half Full Half DATA RATE (Mbps) SLEW-RATE LIMITED No Yes No Yes No LOWRECEIVER/ QUIESCENT POWER DRIVER CURRENT SHUTDOWN ENABLE (A) Yes No Yes No Yes No Yes No Yes NUMBER OF RECEIVERS ON BUS PIN COUNT
For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
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, to +12.5V Receiver Input Voltage (A, to +12.5V Receiver Output Voltage (RO).....................-0.5V to (VCC +0.5V) Continuous Power Dissipation (TA +70°C) 8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW 14-Pin Plastic DIP (derate 10.00mW/°C above 8-Pin SO (derate 5.88mW/°C above 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 MAX4_ _C_ +70°C MAX4_ _E_ to +125°C Storage Temperature 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.
(VCC TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER 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 SYMBOL VOD1 VOD2 VOD VOC VOD VIH VIL 27 (RS-485), Figure or 50, Figure or 50, Figure or 50, Figure 4 DE, DI, RE DE, DI, RE DE, DI, = 0V; VCC or 5.25V, all devices except = 0V, VCC or 5.25V Receiver Differential Threshold Voltage Receiver Input Hysteresis Receiver Output High Voltage Receiver Output Low Voltage Three-State (high impedance) Output Current at Receiver VTH VOH VOL IOZR -7V VCM 12V VCM = -4mA, VID = 4mA, VID 2.4V -7V VCM 12V, all devices except MAX487/MAX1487 Receiver Input Resistance RIN -7V VCM 48 k VIN = 12V VIN = -7V VIN = 12V VIN µA k CONDITIONS MIN TYP MAX 5 UNITS V
(VCC TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MAX488/MAX489, DE, DI, 0V or VCC MAX490/MAX491, DE, DI, 0V or VCC No-Load Supply Current (Note 3) ICC 0V or VCC 0V or VCC 0V or VCC Supply Current in Shutdown Driver Short-Circuit Current, VO = High Driver Short-Circuit Current, VO = Low Receiver Short-Circuit Current ISHDN IOSD1 IOSD2 IOSR DE = VCC DE = VCC MAX483 MAX487 MIN TYP MAX µA UNITS
(VCC TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2) PARAMETER 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 SYMBOL CONDITIONS tPLH Figures 6 and 8, RDIFF = 100pF tPHL tSKEW Figures 6 and 8, RDIFF MAX485, MAX1487 Figures 6 and 8, tR, tF RDIFF MAX490M, MAX491M tZH Figures 7 and 100pF, S2 closed tZL Figures 7 and 100pF, S1 closed tLZ Figures 7 and 15pF, S1 closed tHZ Figures 7 and 15pF, S2 closed Figures 6 and MAX490C/E, MAX491C/E tPLH, tPHL RDIFF MAX490M, MAX491M tSKD tZL tZH tLZ tHZ fMAX tSHDN Figures 6 and 10, RDIFF = 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 (Note 2.5 50 MIN TYP MAX UNITS ns
| 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
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