SN75ALS056, SN75ALS057
TRAPEZOIDAL-WAVEFORM INTERFACE BUS TRANSCEIVERS
SLLS028G – AUGUST 1987 – REVISED JUNE 1998
SN75ALS056 . . . DW OR N PACKAGE
Suitable for IEEE Standard 896
Applications
(TOP VIEW)
†
SN75ALS056 is an Octal Transceiver
SN75ALS057 is a Quad Transceiver
A1
A2
A3
A4
B1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
B2
B3
High-Speed Advanced Low-Power Schottky
(ALS) Circuitry
B4
V
GND
CC
A5
Low Power Dissipation:
52.5 mW/Channel Max
15 B5
14
13
12
11
A6
A7
A8
B6
B7
B8
T/R
High-Impedance pnp Inputs
Logic-Level 1-V Bus Swing Reduces Power
Consumption
CS
Trapezoidal Bus Output Waveform Reduces
Noise Coupling to Adjacent Lines
SN75ALS057 . . . DW OR N PACKAGE
(TOP VIEW)
Power-Up/Power-Down Protection
(Glitch Free)
D1
R1
D2
R2
B1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
Open-Collector Driver Outputs Allow
Wired-OR Connections
E1
B2
Designed to Be a Faster, Lower-Power
Functional Equivalent of National DS3896,
DS3897
E2
V
GND
CC
D3
15 B3
14
13
12
11
R3
D4
R4
TE
E3
B4
E4
RE
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 Ω. 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.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
†
The transceivers are suitable for IEEE Standard 896 applications to the extent of the operating conditions and characteristics specified in this
data sheet.
Copyright 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
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