LTC1535 Datasheet | Linear Technology

Features n UL Rated Isolated RS485: 2500VRMS UL Recognized ® File #E151738 n Eliminates Ground Loops n 250k Bd Maximum Data Rate n Self-Powered with 420k Hz Converter n Half- or Full-Duplex n Fail-Safe Output High for Open or Shorted Receiver Inputs n Short-Circuit Current Limit n Slow Slew Rate Control n 68kΩ Input Impedance Allows Up to 128 Nodes n Thermal Shutdown n 8k V ESD Protection On Driver Outputs and Receiver Inputs n Available in 28-Lead SW Package Applications n Isolated RS485 Receiver/Driver n RS485 with Large mon Mode Voltage n Breaking RS485 Ground Loops n Multiple Unterminated Line Taps LTC1535 Isolated RS485 Transceiver Description The LTC®1535 is an isolated RS485 full-duplex differential line transceiver. Isolated RS485 is ideal for systems where the ground loop is broken to allow for much larger mon mode voltage ranges. An internal capacitive isolation barrier provides 2500VRMS of isolation between the line transceiver and the logic level interface. The powered side contains a 420k Hz push-pull converter to power the isolated RS485 transceiver. Internal full-duplex munication occurs through the capacitive isolation barrier. The transceiver meets RS485 and RS422 requirements. The driver and receiver feature three-state outputs, with the driver maintaining high impedance over the entire mon mode range. The drivers have short-circuit current limits in both directions and a slow slew rate select to minimize EMI or reflections. The 68kΩ receiver input allows up to 128 node connections. A fail-safe feature defaults to a high output state when the receiver inputs are open or shorted. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Typical Application CTX02-146- 5- 9 1/2 BAT54C + 10µF VCC + 10µF 2 1 VCC ST1 LOGIC MON 1 FLOATING RS485 MON - - EATON (888) 414-2645 1 28 RO 27...