SN54ALS646, SN54ALS648, SN54AS646

SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648

OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995

4

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

logic symbols†

A1

4

B1

20

4D

5

7

7

5

1

1

6D

≥1

≥1

1

2

A2

5

B2

19

A3

6

B3

18

A4

7

B4

17

A5

8

B5

16

A6

9

B6

15

A7

10

B7

14

A8

11

B8

13

SN54ALS646, SN54AS646,

SN74ALS646A, SN74AS646

OE

G3

21

3 EN2 [AB]

G5

22

SBA

3 EN1 [BA]

3

DIR

23

CLKBA

1

CLKAB

G7

2

SAB

C6

C4

A1

4

B1

20

4D

5

7

7

5

1

1

6D

≥1

≥1

1

2

A2

5

B2

19

A3

6

B3

18

A4

7

B4

17

A5

8

B5

16

A6

9

B6

15

A7

10

B7

14

A8

11

B8

13

SN54ALS648,

SN74ALS648A, SN74AS648

OE

G3

21

3 EN2 [AB]

G5

22

SBA

3 EN1 [BA]

3

DIR

23

CLKBA

1

CLKAB

G7

2

SAB

C6

C4

† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

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