Philips Semiconductors

Product specification

74LVC823A

9-bit D-type flip-flop with 5-volt tolerant

inputs/outputs; positive-edge trigger (3-State)

1998 Sep 24

3

PIN DESCRIPTION

PIN NUMBER

SYMBOL

NAME AND FUNCTION

1

OE

Output enable input

(active LOW)

2, 3, 4, 5, 6,

7, 8, 9, 10

Data inputs

11

MR

Master reset (active LOW)

12

GND

Ground (0 V)

13

CP

Clock pulse (active rising)

14

CE

Clock enable (active LOW)

23, 22, 21, 20,

19, 18, 17, 16,

15

3-State flip-flop outputs

24

Positive supply voltage

FUNCTION TABLE

OPERATING MODES

INPUTS

INTERNAL FLIP FLOPS

OUTPUTS

OPERATING MODES

OE

MR

CE

CP

INTERNAL FLIP-FLOPS

Clear

L

L

X

X

X

L

L

Load and read register

L

L

H

H

L

L

↑

↑

l

h

L

H

L

H

Load register and disable outputs

H

H

H

H

L

L

X

X

l

h

L

H

Z

Z

Hold

L

H

H

NC

X

NC

NC

H = HIGH voltage level

h

= HIGH voltage level one set-up time prior to the LOW-to-HIGH

CP transition

L

= LOW voltage level

l

= LOW voltage level one set-up time prior to the LOW-to-HIGH

CP transition

Z = high impedance OFF-state

↑ = LOW–to–HIGH clock transition

NC= no change

PIN CONFIGURATION

D 0

D 1

D 2

D 3

D 4

D 5

D 6

GND

D 7

D 8

MR

Q 0

Q 1

Q 2

Q 3

Q 4

V CC

Q 5

Q 6

Q 7

Q 8

CE

CP

1

2

3

4

5

6

7

8

9

10

11

12

20

21

22

23

24

19

18

17

16

15

14

13

OE

SA00418

LOGIC SYMBOL

MR

11

Q 7

Q 8

2

D 0

Q 0

19

20

21

22

23

9

10

D 7

D 8

8

D 6

Q 6

7

D 5

Q 5

6

D 4

Q 4

15

5

D 3

Q 3

16

4

D 2

Q 2

17

3

D 1

Q 1

18

13

14

1

CP

CE

OE

SA00419