DS8641

DS8641 Quad Unified Bus Transceiver January 1996 DS8641 Quad Unified Bus Transceiver General Description The DS8641 is a quad high speed drivers/receivers designed for use in bus organized data transmission systems interconnected by terminated 120Ω impedance lines. The external termination is intended to be a 180Ω resistor from the bus to the +5V logic supply together with a 390Ω resistor from the bus to ground. The bus can be terminated at one or both ends. Low bus pin current allows up to 27 driver/ receiver pairs to utilize a common bus. The bus loading is unchanged when VCC = 0V. The receivers incorporate tight thresholds for better bus noise immunity. One two-input NOR gate is included to disable all drivers in a package simultaneously. Features n 4 separate driver/receiver pairs per package n Guaranteed minimum bus noise immunity of 0.6V, 1.1V typ n Temperature insensitive receiver thresholds track bus logic levels n 30 µA typical bus terminal current with normal VCC or with VCC = 0V n Open collector driver output allows wire-OR connection n High speed n Series 74 TTL compatible driver and disable inputs and receiver outputs Connection Diagram Dual-In-Line Package DS005806-1 Top View Order Number DS8641N See NS Package Number N16A © 1999 National Semiconductor Corporation DS005806 www.national.com Typical Application DS005806-2 www.national.com 2 Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the Nati...