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 commerc...

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