SN75ALS056 Datasheet, PDF (1/15 Pages) Texas Instruments – TRAPEZOIDAL-WAVEFORM INTERFACE BUS TRANSCEIVERS

SN75ALS056, SN75ALS057
TRAPEZOIDAL-WAVEFORM INTERFACE BUS TRANSCEIVERS
SLLS028G – AUGUST 1987 – REVISED JUNE 1998
D Suitable for IEEE Standard 896
Applications^†
D SN75ALS056 is an Octal Transceiver
D SN75ALS057 is a Quad Transceiver
D High-Speed Advanced Low-Power Schottky
(ALS) Circuitry
D Low Power Dissipation:
52.5 mW/Channel Max
D High-Impedance pnp Inputs
D Logic-Level 1-V Bus Swing Reduces Power
Consumption
D Trapezoidal Bus Output Waveform Reduces
Noise Coupling to Adjacent Lines
D Power-Up/Power-Down Protection
(Glitch Free)
D Open-Collector Driver Outputs Allow
Wired-OR Connections
D 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).
SN75ALS056 . . . DW OR N PACKAGE
(TOP VIEW)
A1 ₁
A2 2
A3 3
A4 4
V_CC 5
A5 6
A6 7
A7 8
A8 9
CS ¹⁰
20 ^B1
19 B2
18 B3
17 B4
16 GND
15 B5
14 B6
13 B7
12 B8
11 _T/R
SN75ALS057 . . . DW OR N PACKAGE
(TOP VIEW)
D1 ₁
R1 2
D2 3
R2 4
V_CC 5
D3 6
R3 7
D4 8
R4 9
TE 10
20 ^B1
19 E1
18 B2
17 E2
16 GND
15 B3
14 E3
13 B4
12 E4
11 RE
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.
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.
Copyright © 1998, Texas Instruments Incorporated
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