SP490 and SP491
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 • www.exar.com
SP490,491_100_071408
