Document
SP490/491
Full Duplex RS-485 Transceivers
FEATURES • +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) Now Available in Lead Free Packaging
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
SP490 SP491
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • .