SP491

® SP490/SP491 Full Duplex RS-485 Transceivers +5V Only Low Power BiCMOS Driver/Receiver Enable (SP491) RS-485 and RS-422 Drivers/Receivers Pin Compatible with LTC490 and SN75179 (SP490) ■ Pin Compatible with LTC491 and SN75180 (SP491) ■ ■ ■ ■ ■ DESCRIPTION The SP490 is a low power differential line driver/receiver meeting RS-485 and RS-422 standards up to 5Mbps. The SP491 is identical to the SP490 with the addition of driver and receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity, over wide common mode range. The SP490 is available in 8-pin plastic DIP and 8-pin NSOIC packages for operation over the commercial and industrial temperature ranges. The SP491 is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and industrial temperature ranges. BLOCK DIAGRAMS NC 1 14 Vcc 13 NC 12 A Vcc 1 R 2 R 2 8 A R 11 B R REB 3 7 B DE 4 6 Z D 3 GND 4 10 Z D 5 D 5 Y D GND 6 GND 7 9 Y 8 NC SP490 SP491 Date: 05/10/04 SP490/491 Full Duplex RS-485 Transceivers © Copyright 2004 Sipex Corporation 1 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VCC....................................................................................................