CD74FCT543

BiCMOS OCTAL REGISTERED TRANSCEIVER

WITH 3-STATE OUTPUTS

SCBS742 – JULY 2000

2

POST OFFICE BOX 655303

FUNCTION TABLE†

INPUTS

LATCH

OUTPUT

CEAB

LEAB

OEAB

A

STATUS

B

H

X

X

X

Storing

Z

X

XH

X

–

Z

L

H

L

X

Storing

B0‡

L

L

L

L

Transparent

L

L

L

L

H

Transparent

H

† A-to-B data flow is shown; B-to-A flow control is the same except that

it uses CEBA, LEBA, and OEBA.

‡ Output level before the indicated steady-state input conditions were

established

1

1

4

2C6

14

3

A1

4

A2

B1

22

5D

5

A3

6

A4

7

A5

8

A6

9

A7

10

A8

B2

21

B3

20

B5

18

B4

19

B6

17

B8

15

B7

16

LEAB

3

G2

11

CEAB

2EN4

13

OEAB

1C5

1

LEBA

G1

23

CEBA

1EN3

2

OEBA

6D

§ This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.