SN54LVC652A, SN74LVC652A

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCAS303H – JANUARY 1993 – REVISED AUGUST 1998

2

POST OFFICE BOX 655303

description (continued)

pullup resistor and OEAB should be tied to GND through a pulldown resistor; the minimum value of the resistor

is determined by the current-sinking/current-sourcing capability of the driver.

The SN54LVC652A is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74LVC652A is characterized for operation from –40

°C to 85°C.

FUNCTION TABLE

INPUTS

DATA I/O†

OPERATION OR FUNCTION

OEAB

OEBA

CLKAB

CLKBA

SAB

SBA

A1–A8

B1–B8

OPERATION OR FUNCTION

L

H

H or L

H or L

X

X

Input

Input

Isolation

L

H

↑↑

X

X

Input

Input

Store A and B data

X

H

↑

H or L

X

X

Input

Unspecified‡

Store A, hold B

H

H

↑↑

X‡

X

Input

Output

Store A in both registers

L

X

H or L

↑

X

X

Unspecified‡

Input

Hold A, store B

L

L

↑↑

XX‡

Output

Input

Store B in both registers

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

H

H

X

X

L

X

Input

Output

Real-time A data to B bus

H

H

H or L

X

H

X

Input

Output

Stored A data to B bus

H

L

H or L

H or L

H

H

Output

Output

Stored A data to B bus and

stored B data to A bus

† The data-output functions can be enabled or disabled by a variety of level combinations at OEAB or OEBA. Data-input functions always are

enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs.

‡ Select control = L; clocks can occur simultaneously.

Select control = H; clocks must be staggered to load both registers.