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74ALVT16821DGG

20-bit bus-interface D-type flip-flop; positive-edge trigger (3-State)

Philips Electronics 

Philips Semiconductors

2.5V/3.3V 20-bit bus-interface D-type flip-flop;

positive-edge trigger (3-State)

Product specification

74ALVT16821

PIN DESCRIPTION

PIN NUMBER

SYMBOL

56, 54, 52, 51, 49,

48, 47, 45, 44, 43,

42, 41, 40, 38, 37,

36, 34, 33, 31, 30

1D0 - 1D9

2D0 - 2D9

2, 3, 5, 6, 8, 9, 10,

12, 13, 14,

15, 16, 17, 19, 20,

21, 23, 24, 26, 27

1Q0 - 1Q9

2Q0 - 2Q9

1, 28

1OE, 2OE

56, 29

4, 11, 18, 25, 32,

39, 46, 53

7, 22, 35, 50

1CP, 2CP

GND

VCC

LOGIC DIAGRAM

FUNCTION

Data inputs

Data outputs

Output enable inputs

(active-Low)

Clock pulse inputs

(active rising edge)

Ground (0V)

Positive supply

voltage

FUNCTION TABLE

INPUTS

INTERNAL

nOE nCP nDx REGISTER

OUTPUTS

nQ0 - nQ9

OPERATING

MODE

L

↑

l

L

L

↑

h

H

L

Load and read

H

register

L

↑

X

NC

NC

Hold

H

H

H=

h=

L=

l=

NC=

X=

Z=

↑=

↑=

↑

X

NC

↑ Dn

Dn

Z

Disable

Z

outputs

High voltage level

High voltage level one set-up time prior to the Low-to-High

clock transition

Low voltage level

Low voltage level one set-up time prior to the Low-to-High

clock transition

No change

Don’t care

High impedance “off” state

Low to High clock transition

Not a Low-to-High clock transition

nD0

nD1

nD2

nD3

nD4

nD5

nD6

nD7

nD8

nD9

nCP

nOE

D

CP Q

D

CP Q

D

CP Q

D

CP Q

D

CP Q

D

CP Q

D

CP Q

D

CP Q

D

CP Q

D

CP Q

nQ0

nQ1

nQ2

nQ3

nQ4

nQ5

nQ6

nQ7

nQ8

nQ9

SH00004

1998 Feb 13

4

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