PI74AVC+16821

2.5V 20-Bit Bus Interface

Flip-Flopwith3-StateOutputs

2

PS8548

07/31/01

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PinDescription

Note:

1. H = High Signal Level

L = Low Signal Level

X = Irrelevant

Z = High Impedance

↑ = LOW-to-HIGHTransition

n = 1,2

PinConfiguration

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

25

26

27

28

32

31

30

29

2

2

2

2

GND

GND

2

2

2

2

VCC

VCC

2

2

2

2

2

2

GND

GND

2

2

2

2

2

2

1

1

1

1

1

1

GND

GND

1

1

1

1

1

1

VCC

VCC

1

1

1

1

1

1

GND

GND

1

1

1

QE

1

CLK

2

OE

2

CLK

s

t

u

p

n

Is

t

u

p

t

u

O

E

On

K

L

CD

Qn

L

↑

HH

L

↑

LL

HX

X

Z

e

m

a

N

n

i

Pn

o

it

p

i

r

c

s

e

D

E

O)

W

O

L

e

v

it

c

A

(

t

u

p

n

I

el

b

a

n

E

t

u

p

t

u

O

K

L

C)

H

G

I

H

e

v

it

c

A

(

t

u

p

n

I

k

c

o

l

C

x

Dst

u

p

n

I

a

t

a

D

x

Qst

u

p

t

u

O

e

t

a

t

S

-

3

D

N

Gd

n

u

o

r

G

C

C

Vr

e

w

o

P

56-Pin

A,K