MAX3460MAX3464 19-2217 Rev 1 2/03 +5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers General Description Features The MAX3460MAX3464 are high-speed differential Recommended for Profibus Applications bus transceivers for RS-485 and RS-422 communica- Guaranteed 20Mbps Data Rate tions. They are designed to meet TIA/EIA-422-B, TIA/EIA-485-A, V.11, and X.27 standards. The trans- 20ns Transmitter and Receiver Propagation Delay ceiver complies with the Profibus specification provid- 2ns Transmitter and Receiver Skew ing +2.1V output level with a 54 load, 20Mbps data High Differential Driver Output Level (2.1V on 54 ) rate, and output skew less than 2ns. Each part contains one three-state differential line driver and one differen- Hot-Swap Versions tial input line receiver. The devices operate from a +5V 1A Shutdown Supply Current supply and feature true fail-safe circuitry, which guaran- tees a logic-high receiver output when the receiver Low Supply Current Requirements (2.5mA typ) inputs are open or shorted. This enables all receiver Allow Up to 128 Transceivers on the Bus outputs on a terminated bus to output logic highs when all transmitters are disabled. True Fail-Safe Receiver while Maintaining EIA/TIA- 485 Compatibility All devices feature a 1/4 standard unit load receiver input impedance that allows 128 transceivers on the Designed for Multipoint Transmissions on Long bus. Driver and receiver propagation delays are guar- or Noisy Bus Lines anteed under 20ns for multidrop, clock distribution Full Duplex and Half Duplex Versions Available applications. Drivers are short-circuit current limited and are protected against excessive power dissipation Phase Controls to Correct for Twisted-Pair by thermal shutdown circuitry. The driver and receiver Reversal for 14-Pin Versions feature active-high and active-low enables, respective- Current-Limiting and Thermal Shutdown for ly, that can be connected together externally to serve as a direction control. Driver Overload Protection Applications Ordering Information High-Speed RS-485 Communications PART TEMP RANGE PIN-PACKAGE High-Speed RS-422 Communications MAX3460CSD 0C to +70C 14 SO MAX3460CPD 0C to +70C 14 Plastic DIP Level Translators MAX3460ESD -40C to +85C 14 SO Industrial-Control Local Area Networks MAX3460EPD -40C to +85C 14 Plastic DIP Profibus Applications Ordering Information continued at end of data sheet. Pin Configurations appear at end of data sheet. Selector Guide RECEIVER/ LOW- RECEIVER/ PART HALF/FULL INDEPENDENT DRIVER POWER HOT SWAP DRIVER PHASE PIN COUNT NUMBER DUPLEX SHDN PIN ENABLE SHUTDOWN SELECT MAX3460 Full Yes Yes Yes Yes Yes 14 MAX3461 Full Yes Yes No Yes Yes 14 MAX3462 Full No No No No No 8 MAX3463 Half Yes Yes Yes No No 8 MAX3464 Half Yes Yes No No No 8 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.+5V, Fail-Safe, 20Mbps, Profibus RS-485/ RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ) to GND ..................................-0.3V to +6V Continuous Power Dissipation (T = +70C) CC A Control Input Voltage (RE, DE, DI, SHDN, TXP, RXP) 8-Pin SO (derate 5.88mW/C above +70C)................471mW to GND....................................................-0.3V to (V + 0.3V) 8-Pin DIP (derate 9.09mW/C above +70C)...............727mW CC Driver Output Voltage (Y, Z) to GND.........................-8V to +13V 14-Pin SO (derate 8.33mW/C above +70C)..............667mW Receiver Input Voltage (A, B) to GND.......................-8V to +13V 14-Pin DIP (derate 10mW/C above +70C)................800mW Differential Driver Output Voltage (Y - Z)...............................8V Operating Temperature Range Differential Receiver Input (A - B)..........................................8V MAX346 C ......................................................0C to +70C Receiver Output Voltage (RO) to GND.......-0.3V to (V + 0.3V) MAX346 E ....................................................-40C to +85C CC Output Driver Current (Y, Z) ...........................................250mA Junction Temperature......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C 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. ELECTRICAL CHARACTERISTICS (V = +5V 5%, T = T to T , unless otherwise noted. Typical values are at V = +5V and T = +25C.) (Note 1) CC A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Power-Supply Range V 4.75 5.25 V CC DRIVER Differential Driver Output (no load) V Figure 5, R = V V OD CC Differential Driver Output V Figure 5, R = 27 2.1 V OD Change in Magnitude of Figure 5, R = 50 or 27 V 0.2 V OD Differential Output Voltage (Note 2) Driver Common-Mode Output V Figure 5, R = 50 or 27 3V OC Voltage Change in Magnitude of Figure 5, R = 50 or 27 V 0.2 V OC Common-Mode Voltage (Note 2) Input High Voltage V DE, DI, RE, SHDN 2.0 V IH Input Low Voltage V DE, DI, RE, SHDN 0.8 V IL Input Hysteresis V DE, DI, RE, SHDN 50 mV HYS V = +12V +125 Output Leakage (Y and Z) Full DE = GND, V = IN CC I A O Duplex GND or +5.25V V = -7V -100 IN Input Current I DI, RE, DE, SHDN 1A IN Pulldown Current RXP = TXP = V 515 30 A CC 0 V 12V, output low +250 Driver Short-Circuit Output OUT I mA OSD Current (Note 3) -7V V V , output high -250 OUT CC (V - 1V) V 12V, output low +25 CC OUT Driver Short-Circuit Foldback I mA OSFD Output Current (Note 3) -7V V 1V, output high -25 OUT Thermal Shutdown Threshold 140 C RECEIVER Differential Input Capacitance C 8pF A, B V = +12V 250 IN Input Current (A and B) Full DE = GND, I A A, B Duplex V = GND or 5.25V CC V = -7V -200 IN Receiver Differential Threshold V -7V V 12V -200 -125 -50 mV TH CM Voltage 2 MAX3460MAX3464