SN75ALS161

OCTAL GENERALPURPOSE INTERFACE BUS TRANSCEIVERS

SLLS019F − JUNE 1986 − REVISED JULY 2004

2

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

FUNCTION TABLE

RECEIVE/TRANSMIT

CONTROLS

BUS-MANAGEMENT CHANNELS

DATA-TRANSFER CHANNELS

DC

TE

ATN†

ATN†

SRQ

REN

IFC

EOI

DAV

NDAC

NRFD

(CONTROLLED BY DC)

(CONTROLLED BY TE)

H

H

H

R

T

R

R

T

T

R

R

H

H

L

R

TR

R

R

T

RR

L

L

H

T

R

T

T

R

R

T

T

L

L

L

T

RT

T

T

R

TT

H

L

X

R

T

R

R

R

R

T

T

L

H

X

T

R

T

T

T

T

R

R

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

Direction of data transmission is from the terminal side to the bus side, and the direction of data receiving

is from the bus side to the terminal side.

Data transfer is noninverting in both directions.

† ATN is a normal transceiver channel that functions additionally as an internal direction control or talk

enable for EOI whenever the DC and TE inputs are in the same state. When DC and TE are in opposite

states, the ATN channel functions as an independent transceiver only.