SN74ALS236

64

× 4

ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY

SDAS107C – OCTOBER 1986 – REVISED APRIL 1998

8

POST OFFICE BOX 655303

switching characteristics (see Figure 5)

PARAMETER

FROM

TO

MIN

TYP†

MAX

MIN

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP†

MAX

MIN

MAX

UNIT

f

SI

35

30

MHz

fmax

SO

35

30

MHz

tw‡

IR high

15

8

ns

tw§

OR high

19

8

ns

td(QV-ORH)

Q valid before OR

↑

6

9

–5

12

ns

td(SOL-QX)

Q valid after SO

↓

13

4

ns

tpd

SI

↓

Q

600

800

350

1000

ns

tPHL

SI

↑

IR

20

26

8

30

ns

tPLH

SI

↓

IR

16

21

6

25

ns

tPLH¶

SI

↓

OR

600

800

350

1000

ns

tpd

SO

↓

Q

13

17

4

22

ns

tPHL

SO

↑

OR

23

27

7

33

ns

tPLH

SO

↓

OR

20

24

6

30

ns

tPLH¶

SO

↓

IR

600

800

350

1000

ns

tPHL

RST

↓

OR

22

26

10

34

ns

tPLH

RST

↓

IR

17

21

6

27

ns

tPHL

RST

↓

Q

14

14

17

5

19

ns

† All typical values are at VCC = 5 V, TA = 25°C.

‡ The IR output pulse occurs when the FIFO is full, SI is high, and SO is pulsed (see Figure 4).

§ The OR output pulse occurs when the FIFO is empty, SO is high, and SI is pulsed (see Figure 3).

¶ Data throughput or fall-through times