54ACT16474, 74ACT16474

18BIT REGISTERED BUS TRANSCEIVERS

WITH 3STATE OUTPUTS

SCAS238A − MAY 1992 − REVISED APRIL 1996

2

POST OFFICE BOX 655303

POST OFFICE BOX 1443

FUNCTION TABLE†

INPUTS

OUTPUT

CLKAB

OEAB

A

OUTPUT

B

X

H

X

Z

L

LX

B0‡

↑

LH

H

↑

L

L

L

† A-to-B data flow is shown: B-to-A flow is

similar but uses CLKBA, and OEBA.

‡ Output level before the indicated steady-

state input conditions were established

1OEBA

1OEAB

2OEBA

2OEAB

2

1CLKAB

C1

1A1

3

1D

4

1A2

5

1A3

6

1A4

8

1A5

9

1A6

10

1A7

12

1A8

13

1B1

54

5D

1B2

52

1B3

51

1B4

49

1B5

48

1B6

47

1B7

45

1B8

44

EN2

1

30

2CLKBA

C7

EN8

29

27

2CLKAB

C5

EN6

28

55

1CLKBA

C3

EN4

56

2A1

15

5D

8

2A2

16

2A3

17

2A4

19

2A5

20

2A6

21

2A7

23

2A8

24

2B1

42

7D

2B2

41

2B3

40

2B4

38

2B5

37

2B6

36

2B7

34

2B8

33

2

1B9

43

1A9

14

2B9

31

2A9

26

6

1

1

1

1

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