SN74ALS233B

16

× 5 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY

SCAS253B – MARCH 1990 – REVISED APRIL 1998

6

POST OFFICE BOX 655303

timing requirements over recommended operating free-air temperature range (unless otherwise

noted) (see Figure 1)

MIN

NOM

MAX

UNIT

f lk

Clock frequency

LDCK

40

MHz

fclock

Clock frequency

UNCK

40

MHz

RST low

18

LDCK low

15

tw

Pulse duration

LDCK high

10

ns

UNCK low

15

UNCK high

10

Data before LDCK

↑

8

tsu

Setup time

RST (inactive) before LDCK

↑

5

ns

LDCK (inactive) before RST

↑

5

th

Hold time

Data after LDCK

↑

5

ns

switching characteristics over recommended operating free-air temperature range (unless

otherwise noted) (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

MIN

MAX

UNIT

fmax

LDCK, UNCK

40

MHz

t d

LDCK

↑

Any Q

6

32

ns

tpd

UNCK

↑

Any Q

6

30

ns

tPLH

LDCK

↑

EMPTY

5

25

ns

tPHL

UNCK

↑

EMPTY

6

27

ns

tPHL

RST

↓

EMPTY

5

25

ns

t d

LDCK

↑

EMPTY 1

7

34

ns

tpd

UNCK

↑

EMPTY+1

7

34

ns

tPLH

RST

↓

EMPTY+1

8

31

ns

t d

LDCK

↑

FULL 1

9

33

ns

tpd

UNCK

↑

FULL–1

8

32

ns

tPLH

RST

↓

FULL–1

11

32

ns

tPHL

LDCK

↑

FULL

6

27

ns

tPLH

UNCK

↑

FULL

5

25

ns

tPLH

RST

↓

FULL

9

30

ns

ten

OE

↑

Q

2

15

ns

tdis

OE

↓

Q

1

15

ns