SN54ABT821, SN74ABT821A

10-BIT BUS-INTERFACE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SCBS193E – FEBRUARY 1991 – REVISED MAY 1997

2

POST OFFICE BOX 655303

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

OE

CLK

D

Q

L

↑

H

H

L

↑

LL

L

H or L

X

Q0

H

X

X

Z

6Q

18

7Q

17

8Q

16

9Q

15

10Q

14

7

6D

8

7D

9

8D

10

9D

EN

1

1Q

23

3

2D

4

3D

5

4D

6

5D

2Q

22

3Q

21

4Q

20

5Q

19

13

CLK

OE

11

10D

C2

2D

2

1D

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

Pin numbers shown are for the DB, DW, JT, NT, and W packages.

logic diagram (positive logic)

1D

OE

1Q

CLK

To Nine Other Channels

C1

1D

1

13

2

23

Pin numbers shown are for the DB, DW, JT, NT, and W packages.