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.