Suitable for IEEE Standard 896

Applications†

SN75ALS056 is an Octal Transceiver

SN75ALS057 is a Quad Transceiver

High-Speed Advanced Low-Power Schottky

(ALS) Circuitry

Low Power Dissipation:

52.5 mW/Channel Max

High-Impedance pnp Inputs

Logic-Level 1-V Bus Swing Reduces Power

Consumption

Trapezoidal Bus Output Waveform Reduces

Noise Coupling to Adjacent Lines

Power-Up/Power-Down Protection

(Glitch Free)

Open-Collector Driver Outputs Allow

Wired-OR Connections

Designed to Be a Faster, Lower-Power

Functional Equivalent of National DS3896,

DS3897

description

The SN75ALS056 is an eight-channel,

monolithic, high-speed, advanced low-power

Schottky (ALS) device designed for two-way data

communication in a densely populated

backplane. The SN75ALS057 is a four-channel

version with independent driver-input (Dn) and

receiver-output (Rn) pins and a separate driver

disable for each driver (En).

These transceivers feature open-collector driver outputs with series Schottky diodes to reduce capacitive

loading to the bus. By using a 2-V pullup termination on the bus, the output signal swing is approximately 1 V,

which reduces the power necessary to drive the bus load capacitance. The driver outputs generate trapezoidal

waveforms that reduce crosstalk between channels. The drivers are capable of driving an equivalent dc load

as low as 18.5 W. The receivers have internal low-pass filters to further improve noise immunity.

The SN75ALS056 and SN75ALS057 are characterized for operation from 0°C to 70°C.