DS8641数据手册TI中文资料规格书

描述 Description

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.

特性 Features

■ 4 separate driver/receiver pairs per package
■ Guaranteed minimum bus noise immunity of 0.6V, 1.1V typ
■ Temperature insensitive receiver thresholds track bus logic levels
■ 30 µA typical bus terminal current with normal VCC or with VCC = 0V
■ Open collector driver output allows wire-OR connection
■ High speed
■ Series 74 TTL compatible driver and disable inputs and receiver outputs