MAX13448E 19-4098 Rev 0 5/08 80V Fault-Protected Full-Duplex RS-485 Transceiver General Description Features The MAX13448E full-duplex RS-485 transceiver fea- 80V Fault Protection on the RS-485 I/O Ports tures inputs and outputs fault protected up to 80V True Fail-Safe Receiver (with respect to ground). The device operates from a +3.0V to +5.5V supply and features true fail-safe cir- Hot-Swap Input Structure on DE cuitry, guaranteeing a logic-high receiver output when ESD Protection on the RS-485 I/O Ports the receiver inputs are open or shorted. This enables all 8kV Human Body Model receiver outputs on a terminated bus to output logic- high when all transmitters are disabled. Slew-Rate Limiting Facilitates Error-Free Data The MAX13448E features a slew-rate limited driver that Transmission minimizes EMI and reduces reflections caused by 1/8-Unit Load Allows Up to 256 Transceivers on improperly terminated cables, allowing error-free data the Bus transmission at data rates up to 500kbps with a +5V supply, and 250kbps with a +3.3V supply. -7V to +12V Common-Mode Input Voltage Range The MAX13448E includes a hot-swap capability to elimi- +3.0V to +5.5V Operating Supply Voltage nate false transitions on the bus during power-up or hot Available in 14-Pin SO Package insertion. The driver and receiver feature active-high and active-low enables, respectively, that can be connected together externally to serve as a direction control. The MAX13448E features an 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. Ordering Information All driver outputs are protected to 8kV ESD using the PART TEMP RANGE PIN-PACKAGE Human Body Model. The MAX13448E is available in a 14-pin SO package and operates over the extended MAX13448EESD+ -40C to +85C 14 SO -40C to +85C temperature range. +Denotes a lead-free package. Applications Industrial Control Systems HVAC Control systems Pin Configuration appears at end of data sheet. Utility Meters Motor Driver Control Systems Functional Diagram V CC MAX13448E DE RE V CC + N.C. 1 14 V CC 1F 414 RO 2 13 N.C. R 9 Y 5 R R RO t D DI 10 RE3A12 Z DE4B11 12 A DI5Z10 2 RO R R t D D 11 DI 1, 8, GND6Y9 B 13 N.C. GND 7 8 N.C. 3 6, 7 GND DE GND RE SO Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.80V Fault-Protected Full-Duplex RS-485 Transceiver ABSOLUTE MAXIMUM RATINGS (All voltages reference to GND.) Continuous Power Dissipation (T = +70C) A Supply Voltage (V ).............................................................+6V 14-Pin SO (derate 8.3mW/C above +70C)................667mW CC Control Input Voltage (RE, DE)...................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C CC Driver Input Voltage (DI).............................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC Receiver Input Voltage (A, B (Note 1)) ................................80V Storage Temperature Range .............................-65C to +150C Driver Output Voltage (Y, Z (Note 1)) ..................................80V Lead Temperature (soldering, 10s) .................................+300C Receiver Output Voltage (RO)....................-0.3V to (V + 0.3V) CC Short-Circuit Duration (RO, A, B) ...............................Continuous Note 1: If the RS-485 transmission lines are unterminated and a short to a voltage V occurs at a remote point on the line, an active SHT local driver (with DI switching) may see higher voltage than V due to inductive kickback at the driver. Terminating the line SHT with a resistor equal to its characteristic impedance minimizes this kickback effect. 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 = +3.0 to +5.5V, T = T to T , unless otherwise noted. Typical values are at V = +3.3V and T = +25C.) (Notes 2, 3) CC A MIN MAX CC A PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS V Supply Voltage Range V 3.0 5.5 V CC CC N o loa d , D E , D I, RE = 0V or V , V = 3.3V 15 C C C C Supply Current I mA Q No load, DE, DI, RE = 0V or V , V = 5V 15 CC CC DE = GND, RE = V , V = 3.3V 100 Supply Current in Shutdown CC CC I A SHDN Mode DE = GND, RE = V , V = 5V 100 CC CC DE = GND, RE = GND, short to +60V 15 Supply Current with Output I mA SHRT Shorted to 60V DE = GND, RE = GND, short to -60V 15 DRIVER R = 100, Figure 1 2 V L CC Differential Driver Output V V OD R = 54, Figure 1 1.5 V L CC Change in Magnitude of V R = 100 or 54, Figure 1 (Note 4) -0.2 0.2 V OD L Differential Output Voltage Driver Common-Mode Output V RL = 100 or 54, Figure 1 V /2 3 V OC CC Voltage Change in Magnitude of V RL = 100 or 54, Figure 1 (Note 4) -0.2 +0.2 V OC Common-Mode Voltage DI = low, 0V V or V +12V +250 Driver Short-Circuit Output Y Z I mA OSD Current DI = high, -7V V or V V (Note 5) -250 Y Z CC DI = low, (V - 1V) V or V +12V +10 CC Y Z Driver Short-Circuit Foldback I mA OSDF Output Current DI = high, -7V V or V +1V -10 Y Z V or V + 22V, R = 100 +6 Driver-Limit Short-Circuit Y Z L I mA OSDL Foldback Output Current V or V -13V, R = 100 -6 Y Z L Driver Input High Voltage V 2V DIH Driver Input Low Voltage V 0.8V DIL Driver Input Current I -1+1A DIN 2 MAX13448E