2

PS8102A 10/07/98

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PI74ALVCH16646

16-Bit Bus Transceiver and Register

with 3-STATE Outputs

1

DIR

1

1

CLKAB

2

1

SAB

3

GND

4

1

5

1

6

7

1

8

1

9

1

10

GND

11

1

12

1

13

1

14

2

15

2

16

2

17

GND

18

2

19

2

20

2

21

22

2

23

2

24

1

OE

56

1

CLKBA

55

1

SBA

54

GND

53

1

52

1

51

50

1

49

1

48

1

47

GND

46

1

45

1

44

1

43

2

42

2

41

2

40

GND

39

2

38

2

37

2

36

35

2

34

2

33

GND

25

2

SAB

26

2

CLKAB

27

2

DIR

28

GND

32

2

SBA

31

2

CLKBA

30

2

OE

29

Product Pin Description

Product Pin Configuration

e

m

a

N

n

i

Pn

o

it

p

i

r

c

s

e

D

E

O

x)

W

O

L

e

v

it

c

A

(

st

u

p

n

I

el

b

a

n

E

t

u

p

t

u

O

R

I

D

xl

o

rt

n

o

C

n

o

it

c

e

ri

D

A

B

K

L

C

x

,

B

A

K

L

C

xst

u

p

n

I

e

sl

u

P

k

c

o

l

C

A

B

S

x

,

B

A

S

xst

u

p

n

I

l

o

rt

n

o

C

t

c

el

e

S

x

A

x

st

u

p

n

I

A

r

e

t

si

g

e

R

a

t

a

D

st

u

p

t

u

O

B

r

e

t

si

g

e

R

a

t

a

D

x

B

x

st

u

p

n

I

B

r

e

t

si

g

e

R

a

t

a

D

st

u

p

t

u

O

A

r

e

t

si

g

e

R

a

t

a

D

D

N

Gd

n

u

o

r

G

C

r

e

w

o

P

56-PIN

V56

A56

Inputs

Data I/O

Function

xOE

xDIR

xCLKAB xCLKBA

xSAB xSBA

xAx

xBx

XX

↑

X

X

X

Input

XX

X

↑

X

X

Input

Isolation

H

X

H or L

H or L

X

X

Input Disable

Input Disable

Store A and B Data

H

X

↑↑

X

X

Input

Input

Real Time A Data to B Bus

L

H

X

X

L

X

Input

Output

Stored A Data to B Bus

L

H

H or L

X

H

X

Input

Output

Real Time B Data to A Bus

L

L

X

X

X

L

Output

Input

Stored B Data to A Bus

L

L

X

H or L

X

H

Output

Input

Note:

1. The data output functions may be enabled or disabled by various signals at the xOE or xDIR inputs. Data input functions are always

enabled, i.e., data at the bus pins will be stored on every LOW-to-HIGH transition on the clock inputs.

2. H = High Voltage Level

X = Don't Care

L = Low Voltage Level

↑ = LOW-to-HIGH Transition