SN74ACT7807

2048

× 9

CLOCKED FIRST-IN, FIRST-OUT MEMORY

SCAS200D – JANUARY 1991 – REVISED APRIL 1998

11

POST OFFICE BOX 655303

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

noted) (see Figures 1 through 5)

’ACT7807-15

’ACT7807-20

’ACT7807-25

’ACT7807-40

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

67

50

40

25

MHz

WRTCLK high or low

6

8

9

13

tw

Pulse duration

RDCLK high or low

6

8

9

13

ns

PEN low

6

9

9

13

D0–D8 before WRTCLK

↑

4

5

5

5

WRTEN1, WRTEN2

before WRTCLK

↑

4

5

5

5

tsu

Setup time

OE, RDEN1, RDEN2

before RDCLK

↑

5

6

6

6.5

ns

Reset: RESET low before

first WRTCLK

↑ and RDCLK↑†

7

8

8

8

PEN before WRTCLK

↑

4

5

5

5

D0–D8 after WRTCLK

↑

0

0

0

0

WRTEN1, WRTEN2

after WRTCLK

↑

0

0

0

0

th

Hold time

OE, RDEN1, RDEN2

after RDCLK

↑

0

0

0

0

ns

h

Reset: RESET low after

fourth WRTCLK

↑ and RDCLK↑†

5

5

5

5

PEN high after WRTCLK

↓

0

0

0

0

PEN low after WRTCLK

↑

3

3

3

3

† To permit the clock pulse to be utilized for reset purposes

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

PARAMETER

FROM

TO

’ACT7807-15

’ACT7807-20

’ACT7807-25

’ACT7807-40

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP‡

MAX

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

WRTCLK or

RDCLK

67

50

40

25

MHz

tpd

RDCLK

↑

Any Q

3

9

12

3

13

3

18

3

25

ns

tpd§

RDCLK

↑

Any Q

8

ns

WRTCLK

↑

IR

1

9

1

12

1

14

1

16

t d

RDCLK

↑

OR

1

9

2

12

2

14

2

16

ns

tpd

WRTCLK

↑

AF/AE

2

16

2

20

2

25

2

30

ns

RDCLK

↑

AF/AE

2

17

2

20

2

25

2

30

tPLH

WRTCLK

↑

HF

2

19

2

21

2

23

2

25

ns

tPHL

RDCLK

↑

HF

2

16

2

18

2

20

2

22

ns

tPLH

RESET low

AF/AE

1

12

1

18

1

22

1

24

ns

tPHL

RESET low

HF

2

12

2

18

2

22

2

24

ns

ten

OE

Any Q

2

10

2

13

2

15

2

18

ns

tdis

OE

Any Q

1

11

1

13

1

15

1

18

ns

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

§ This parameter is measured with CL = 30 pF (see Figure 6).