54ACT16648, 74ACT16648

16BIT TRANSCEIVERS AND REGISTERS

WITH 3STATE OUTPUTS

SCAS188A − MAY 1991 − REVISED APRIL 1996

2

POST OFFICE BOX 655303

POST OFFICE BOX 1443

description (continued)

The 54ACT16648 is characterized for operation over the full military temperature range of −55

°C to 125°C. The

74ACT16648 is characterized for operation from −40

°C to 85°C.

FUNCTION TABLE

(each 8-bit section)

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

L

L

X

X

Input disabled

Input disabled

Isolation, hold storage

L

L

X

X

X

L

Output

Input

Real-time B data to A bus

L

L

X

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

L

X

H

X

Input

Output

Stored A data to B bus

† The data-output functions may be enabled or disabled by a variety of level combinations at OE and 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.