MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 …

1 MAX481/MAX483/MAX485/. MAX487 MAX491/MAX1487. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers General Description __Next Generation Device Features The MAX481, MAX483, MAX485, MAX487 MAX491, and o For Fault-Tolerant Applications MAX1487 are low-power transceivers for RS-485 and RS- MAX3430: 80V Fault-Protected, Fail-Safe, 1/4. 422 communication. Each part contains one driver and one Unit Load, + , RS-485 Transceiver receiver. The MAX483, MAX487, MAX488, and MAX489. feature reduced slew-rate drivers that minimize EMI and MAX3440E MAX3444E: 15kV ESD-Protected, reduce reflections caused by improperly terminated cables, 60V Fault-Protected, 10 Mbps, Fail-Safe, thus allowing error-free data transmission up to 250kbps.

2 RS-485/J1708 Transceivers The driver slew rates of the MAX481, MAX485, MAX490, o For Space-Constrained Applications MAX491, and MAX1487 are not limited, allowing them to transmit up to MAX3460 MAX3464: +5V, Fail-Safe, 20 Mbps, Profibus RS-485/RS-422 Transceivers These transceivers draw between 120 A and 500 A of supply current when unloaded or fully loaded with disabled MAX3362: + , High-Speed, RS-485/RS-422. drivers. Additionally, the MAX481, MAX483, and MAX487 Transceiver in a SOT23 Package have a low-current shutdown mode in which they consume MAX3280E MAX3284E: 15kV ESD-Protected, only A. All parts operate from a single 5V supply.

3 52 Mbps, +3V to + , SOT23, RS-485/RS-422, Drivers are short-circuit current limited and are protected True Fail-Safe Receivers against excessive power dissipation by thermal shutdown MAX3293/MAX3294/MAX3295: 20 Mbps, + , circuitry that places the driver outputs into a high-imped- SOT23, RS-485/RS-422 Transmitters ance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit. o For Multiple Transceiver Applications MAX3030E MAX3033E: 15kV ESD-Protected, The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/ + , Quad RS-422 Transmitters MAX1487 transceivers on the bus.

4 Full-duplex communi- o For Fail-Safe Applications cations are obtained using the MAX488 MAX491, while MAX3080 MAX3089: Fail-Safe, High-Speed the MAX481, MAX483, MAX485, MAX487, and MAX1487 (10 Mbps), Slew-Rate-Limited RS-485/RS-422. are designed for half-duplex applications. Transceivers _____Applications o For Low-Voltage Applications Low-Power RS-485 Transceivers MAX3483E/MAX3485E/MAX3486E/MAX3488E/. MAX3490E/MAX3491E: + Powered, 15kV. Low-Power RS-422 Transceivers ESD-Protected, 12 Mbps, Slew-Rate-Limited, Level Translators True RS-485/RS-422 Transceivers Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks Ordering Information appears at end of data sheet.

5 _____Selection Table DATA LOW- RECEIVER/ QUIESCENT NUMBER OF. PART HALF/FULL SLEW-RATE PIN. RATE POWER DRIVER CURRENT RECEIVERS ON. NUMBER DUPLEX LIMITED COUNT. (Mbps) SHUTDOWN ENABLE ( A) BUS. MAX481 Half No Yes Yes 300 32 8. MAX483 Half Yes Yes Yes 120 32 8. MAX485 Half No No Yes 300 32 8. MAX487 Half Yes Yes Yes 120 128 8. MAX488 Full Yes No No 120 32 8. MAX489 Full Yes No Yes 120 32 14. MAX490 Full No No No 300 32 8. MAX491 Full No No Yes 300 32 14. MAX1487 Half No No Yes 230 128 8. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at 19-0122; Rev 10; 9/14.

6 MAX481/MAX483/MAX485/. MAX487 MAX491/MAX1487. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS. Supply Voltage (VCC) ..12V 14-Pin SO (derate C above +70 C)..667mW. Control Input Voltage (RE, DE).. to (VCC + ) 8-Pin MAX (derate C above +70 C) ..830mW. Driver Input Voltage (DI).. to (VCC + ) 8-Pin CERDIP (derate C above +70 C)..640mW. Driver Output Voltage (A, B)..-8V to + 14-Pin CERDIP (derate C above +70 C)..727mW. Receiver Input Voltage (A, B)..-8V to + Operating Temperature Ranges Receiver Output Voltage (RO).. to (VCC + ) MAX4_ _C_ _/MAX1487C_ A ..0 C to +70 C. Continuous Power Dissipation (TA = +70 C) MAX4_ _E_ _/MAX1487E_ A.

7 -40 C to +85 C. 8-Pin Plastic DIP (derate C above +70 C) ..727mW MAX4_ _M_/MAX1487 MJA ..-55 C to +125 C. 14-Pin Plastic DIP (derate C above +70 C) ..800mW Storage Temperature Range ..-65 C to +160 C. 8-Pin SO (derate C above +70 C)..471mW 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.

8 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) VOD1 5 V. Differential Driver Output R = 50 (RS-422) 2. VOD2 V. (with load) R = 27 (RS-485), Figure 4 5. Change in Magnitude of Driver Differential Output Voltage for VOD R = 27 or 50 , Figure 4 V. Complementary Output States Driver Common-Mode Output VOC R = 27 or 50 , Figure 4 3 V. Voltage Change in Magnitude of Driver Common-Mode Output Voltage VOD R = 27 or 50 , Figure 4 V. for Complementary Output States Input High Voltage VIH DE, DI, RE V.

9 Input Low Voltage VIL DE, DI, RE V. Input Current IIN1 DE, DI, RE 2 A. DE = 0V;. VIN = 12V VCC = 0V or , mA. Input Current all devices except IIN2 VIN = -7V (A, B) MAX487/MAX1487. MAX487/MAX1487, VIN = 12V mA. DE = 0V, VCC = 0V or VIN = -7V Receiver Differential Threshold VTH -7V VCM 12V V. Voltage Receiver Input Hysteresis VTH VCM = 0V 70 mV. Receiver Output High Voltage VOH IO = -4mA, VID = 200mV V. Receiver Output Low Voltage VOL IO = 4mA, VID = -200mV V. Three-State (high impedance). IOZR VO 1 A. Output Current at Receiver -7V VCM 12V, all devices except 12 k . MAX487/MAX1487. Receiver Input Resistance RIN. -7V VCM 12V, MAX487/MAX1487 48 k.

10 2 Maxim Integrated MAX481/MAX483/MAX485/. MAX487 MAX491/MAX1487. Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers DC ELECTRICAL CHARACTERISTICS (continued). (VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2). PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS. MAX488/MAX489, 120 250. DE, DI, RE = 0V or VCC. MAX490/MAX491, 300 500. DE, DI, RE = 0V or VCC. MAX481/MAX485, DE = VCC 500 900. No-Load Supply Current ICC RE = 0V or VCC DE = 0V 300 500 A. (Note 3). MAX1487, DE = VCC 300 500. RE = 0V or VCC DE = 0V 230 400. MAX483 350 650. MAX483/MAX487, DE = 5V. MAX487 250 400. RE = 0V or VCC. DE = 0V 120 250.