54ACT16646, 74ACT16646

16-BIT BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCAS127B – MARCH 1990 – REVISED APRIL 1996

3

POST OFFICE BOX 655303

FUNCTION TABLE

INPUTS

DATA I/O†

OPERATION OR FUNCTION

OE

DIR

CLKAB

CLKBA

SAB

SBA

A1–A8

B1–B8

OPERATION OR FUNCTION

X

X

↑

X

X

X

Input

Unspecified

Store A, B unspecified{

X

XX

↑

X

X

Unspecified

Input

Store B, A unspecified{

H

X

↑

↑

X

X

Input

Input

Store A and B data

H

X

H or L

H or L

X

X

Input

Input

Isolation, hold storage

L

L

X

X

X

L

Output

Input

Real-time B data to A bus

L

L

X

H or L

X

H

Output

Input

Stored B data to A bus

L

H

X

X

L

X

Input

Output

Real-time A data to B Bus

L

H

H or L

X

H

X

Input

Output

Stored A data to bus

† The data-output functions may be enabled or disabled by various signals at OE or DIR. Data-input functions are always enabled, i.e., data at

the bus terminals is stored on every low-to-high transition of the clock inputs.