SN74ALS229B

16

× 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY

SDAS090 – MARCH 1990 – REVISED JUNE 1992

2

POST OFFICE BOX 655303

CT = 0

11

EN4

1

OE

2D

5

D0

17

(CT = 0) G3

Q0

16

6

D1

Q1

15

7

D2

Q2

14

8

D3

Q3

13

9

D4

Q4

12

18

UNCK

19

CT = 2

2

CT = 14

3

(CT = 16) G1

4

LDCK

FIFO 16

× 5

CTR

RST

FULL

FULL–2

EMPTY+2

EMPTY

3 –

1(+/C2)

4

† This symbol is in accordance with ANSI/IEEE Standard 91-1984 and IEC Publication 617-12. The symbol is functionally accurate but does not

show the details of implementation; for these, see the logic diagram. The symbol represents the memory as if it were controlled by a single counter

whose content is the number of words stored at the time. Output data is invalid when the counter content (CT) is 0.

Pin numbers shown are for the DW and N packages.