SN74ACT2235

1024

× 9 × 2

ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY

SCAS148F – DECEMBER 1990 – REVISED JUNE 2003

10

POST OFFICE BOX 655303

switching characteristics over recommended ranges of supply voltage and operating free-air

PARAMETER

FROM

TO

’ACT2235-20

’ACT2235-30

’ACT2235-40

’ACT2235-60

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP†

MAX

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

f

LDCK

50

33

25

16.7

MHz

fmax

UNCK

50

33

25

16.7

MHz

t d

LDCK

↑,

LDCKB

↑

BorA

8

22

8

22

8

24

8

26

ns

tpd

UNCKA

↑,

UNCKB

↑

B or A

12

17

25

12

25

12

35

12

45

ns

tPLH

LDCK

↑,

LDCKB

↑

EMPTYA,

EMPTYB

4

15

4

15

4

17

4

19

ns

UNCKA

↑,

UNCKB

↑

EMPTYA,

EMPTYB

2

17

2

17

2

19

2

21

tPHL

RSTA

↓, RSTB↓

EMPTYB

2

18

2

18

2

20

2

22

ns

LDCK

↑,

LDCKB

↑

FULLA, FULLB

4

15

4

15

4

17

4

19

UNCKA

↑,

UNCKB

↑

FULLA, FULLB

4

15

4

15

4

17

4

19

↓

↓

FULLA, FULLB

2

15

2

15

2

17

2

19

tPLH

RSTA

↓, RSTB↓

AF/AEA,

AF/AEB

2

15

2

15

2

17

2

19

ns

LDCK

↑,

LDCKB

↑

HFA, HFB

2

15

2

15

2

17

2

19

tPHL

UNCKA

↑,

UNCKB

↑

HFA, HFB

4

18

4

18

4

20

4

22

ns

PHL

RSTA

↓, RSTB↓

,

1

15

1

15

1

17

1

19

SAB or SBA‡

BorA

1

11

1

11

1

12

1

14

A or B

B or A

1

11

1

11

1

12

1

14

tpd

LDCK

↑,

LDCKB

↑

AF/AEA,

2

18

2

18

2

20

2

22

ns

UNCKA

↑,

UNCKB

↑

,

AF/AEB

2

18

2

18

2

20

2

22

ten

GBA or GAB

A or B

2

11

2

11

2

13

2

15

ns

tdis

GBA or GAB

A or B

1

9

1

9

1

11

1

13

ns

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

‡ These parameters are measured with the internal output state of the storage register opposite that of the bus input.

PARAMETER

TEST CONDITIONS

TYP

UNIT

C d

Power dissipation capacitance per 1K bits

Outputs enabled

CL =50 pF

f=5MHz

71

pF

Cpd

Power dissipation capacitance per 1K bits

Outputs disabled

CL = 50 pF,

f = 5 MHz

57

pF