SN75ALS056, SN75ALS057

TRAPEZOIDAL-WAVEFORM INTERFACE BUS TRANSCEIVERS

SLLS028G – AUGUST 1987 – REVISED JUNE 1998

4

POST OFFICE BOX 655303

Function Tables

SN75ALS056

TRANSMIT/RECEIVE

CONTROLS

CHANNELS

CS

T/R

A

↔ B

L

H

T(A

B)

L

L

R(B

A)

H

X

D

SN75ALS057

TRANSMIT/RECEIVE

CONTROLS

CHANNELS

TE

RE

En

D

B

B

R

L

L

L

D

R

L

LH

T

R

L

HL

D

D

L

HH

T

D

H

LX

D

R

H

H

X

D

D

H = high level, L = low level, R = receive, T = transmit,

D = disable, X = irrelevant

Direction of data transmission is from An to Bn for the SN75ALS056 and from Dn to Bn for the SN75ALS057.

Direction of data reception is from Bn to An for the SN75ALS056 and from Bn to Rn for the SN75ALS057. Data

transfer is inverting in both directions.