SN75ALS056, SN75ALS057

TRAPEZOIDAL-WAVEFORM INTERFACE BUS TRANSCEIVERS

SLLS028G – AUGUST 1987 – REVISED JUNE 1998

1

POST OFFICE BOX 655303

(ALS) Circuitry

52.5 mW/Channel Max

Consumption

Noise Coupling to Adjacent Lines

(Glitch Free)

Wired-OR Connections

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

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.

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.

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.

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A1

A2

A3

A4

A5

A6

A7

A8

CS

B1

B2

B3

B4

GND

B5

B6

B7

B8

T/R

SN75ALS057 . . . DW OR N PACKAGE

(TOP VIEW)

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D1

R1

D2

R2

D3

R3

D4

R4

TE

B1

E1

B2

E2

GND

B3

E3

B4

E4

RE

SN75ALS056 . . . DW OR N PACKAGE

(TOP VIEW)

† The transceivers are suitable for IEEE Standard 896 applications to the extent of the operating conditions and characteristics specified in this

data sheet.