SN74ALS233B

16

× 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY

SCAS253B – MARCH 1990 – REVISED APRIL 1998

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 = 1

2

CT = 15

3

(CT = 16) G1

4

LDCK

FIFO 16

× 5

(ALS233B)

CTR

RST

FULL

FULL–1

EMPTY+1

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.