SN74ACT2226, SN74ACT2228

DUAL 64

× 1, DUAL 256 × 1

CLOCKED FIRST-IN, FIRST-OUT MEMORIES

SCAS219C – JUNE 1992 – REVISED OCTOBER 1997

2

POST OFFICE BOX 655303

RESET

8

6

1D

1Q

21

Φ

FIFO 64

× 1

SN74ACT2226

3

1WRTCLK

WRTEN

4

1WRTEN

WRTCLK

24

1RDCLK

RDCLK

RDEN

23

1RDEN

1IR

5

IN RDY

1HF

1

HALF FULL

1AF/AE

2

ALMOST FULL/EMPTY

1OR

22

OUT RDY

RESET

20

18

2D

2Q

9

15

2WRTCLK

WRTEN

16

2WRTEN

12

2RDCLK

RDEN

11

2RDEN

2IR

17

IN RDY

2HF

13

HALF FULL

2AF/AE

14

ALMOST FULL/EMPTY

2OR

10

OUT RDY

1RESET

2RESET

RESET

8

6

1D

1Q

21

Φ

FIFO 256

× 1

SN74ACT2228

3

1WRTCLK

WRTEN

4

1WRTEN

WRTCLK

24

1RDCLK

RDCLK

RDEN

23

1RDEN

1IR

5

IN RDY

1HF

1

HALF FULL

1AF/AE

2

ALMOST FULL/EMPTY

1OR

22

OUT RDY

RESET

20

18

2D

2Q

9

15

2WRTCLK

WRTEN

16

2WRTEN

12

2RDCLK

RDEN

11

2RDEN

2IR

17

IN RDY

2HF

13

HALF FULL

2AF/AE

14

ALMOST FULL/EMPTY

2OR

10

OUT RDY

1RESET

2RESET

WRTCLK

RDCLK

WRTCLK

RDCLK

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