SN74ACT7802

1024

× 18 STROBED FIRST-IN, FIRST-OUT MEMORY

SCAS187D – AUGUST 1990 – REVISED APRIL 1998

8

POST OFFICE BOX 655303

timing requirements over recommended operating conditions (see Figures 1 and 2)

’ACT7802-25

’ACT7802-40

’ACT7802-60

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

40

25

16.7

MHz

LDCK high or low

10

14

20

t

Pulse duration

UNCK high or low

10

14

20

ns

tw

Pulse duration

DAF high

10

10

10

ns

RESET low

20

25

25

D0–D7 before LDCK

↑

4

5

5

RESET inactive (high) before LDCK

↑

5

5

5

tsu

Setup time

Define AF/AE: D0–D8 before DAF

↓

5

5

5

ns

Define AF/AE: DAF

↓ before RESET↑

7

7

7

Define AF/AE (default): DAF high before RESET

↑

5

5

5

D0–D7 after LDCK

↑

1

2

2

th

Hold time

Define AF/AE: D0–D8 after DAF

↓

0

0

0

ns

th

Hold time

Define AF/AE: DAF low after RESET

↑

0

0

0

ns

Define AF/AE (default): DAF high after RESET

↑

0

0

0

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

PARAMETER

FROM

TO

’ACT7802-25

’ACT7802-40

’ACT7802-60

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP†

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

LDCK or UNCK

40

25

16.7

MHz

t d

LDCK

↑

Any Q

8

20

30

8

35

8

45

ns

tpd

UNCK

↑

Any Q

12

30

12

35

12

45

ns

tpd‡

UNCK

↑

Any Q

21

ns

tPLH

LDCK

↑

EMPTY

4

18

4

20

4

22

ns

UNCK

↑

EMPTY

2

18

2

20

2

22

tPHL

RESET

↓

EMPTY

2

18

2

20

2

22

ns

LDCK

↑

FULL

4

18

4

20

4

22

tPLH

UNCK

↑

FULL

4

17

4

19

4

21

ns

tPLH

RESET

↓

FULL

2

17

2

19

2

21

ns

t d

LDCK

↑

AF/AE

2

20

2

22

2

24

ns

tpd

UNCK

↑

AF/AE

2

20

2

22

2

24

ns

tPLH

RESET

↓

AF/AE

2

17

2

19

2

21

ns

tPLH

LDCK

↑

HF

2

18

2

20

2

22

ns

tPHL

UNCK

↑

HF

2

18

2

20

2

22

ns

tPHL

RESET

↓

HF

2

17

2

19

2

21

ns

ten

OE

Any Q

2

12

2

14

2

16

ns

tdis

OE

Any Q

2

14

2

16

2

18

ns

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

‡ This parameter is measured with CL = 30 pF (see Figure 3).

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance per channel

CL = 50 pF,

f = 5 MHz

65

pF