SN74ACT7882

2048

× 18

CLOCKED FIRST-IN, FIRST-OUT MEMORY

SCAS445C – JUNE 1994 – REVISED APRIL 1998

11

POST OFFICE BOX 655303

timing requirements over recommended ranges of supply voltage and operating free-air

temperature (see Figures 1 through 5)

’ACT7882-15

’ACT7882-20

’ACT7882-30

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

67

50

33.4

MHz

WRTCLK high

5

7

8.5

WRTCLK low

6

7

11

tw

Pulse duration

RDCLK high

5

7

8.5

ns

RDCLK low

6

7

11

DAF high (default AF/AE value)

7

8

10

Data in (D0–D17) before WRTCLK

↑

5

5

5

WRTEN1, WRTEN2 high before WRTCLK

↑

4

5

5

OE, RDEN1, RDEN2 high before RDCLK

↑

4

5

5

tsu

Setup time

Reset: RESET low before first WRTCLK

↑

and RDCLK

↑†

5

6

7

ns

Define AF/AE: D0–D9 before DAF

↓

5

5

5

Define AF/AE: DAF

↓ before RESET↑

4

6

7

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

↑

4

5

5

Data in (D0–D17) after WRTCLK

↑

0

0

0

WRTEN1, WRTEN2 high after WRTCLK

↑

0

0

0

OE, RDEN1, RDEN2 high after RDCLK

↑

0

0

1

th

Hold time

Reset: RESET low after fourth WRTCLK

↑

and RDCLK

↑†

0

0

0

ns

Define AF/AE: D0–D9 after DAF

↓

0

0

0

Define AF/AE: DAF low after RESET

↑

0

0

0

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

↑

0

0

0

† 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

’ACT7882-15

’ACT7882-20

’ACT7882-30

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

WRTCLK or RDCLK

67

50

33.4

MHz

tpd

RDCLK

↑

Any Q

3

12

3

13

3

18

ns

tpd‡

RDCLK

↑

Any Q

WRTCLK

↑

IR

2

8

2

9.5

2

12

t d

RDCLK

↑

OR

2

8

2

9.5

2

12

ns

tpd

WRTCLK

↑

AF/AE

6

17

6

19

6

22

RDCLK

↑

AF/AE

6

17

6

19

6

22

tPLH

WRTCLK

↑

HF

6

14

6

17

6

21

ns

tPHL

RDCLK

↑

HF

6

14

6

17

6

21

ns

tPLH

RESET

↓

AF/AE

3

12

3

17

3

21

ns

tPHL

RESET

↓

HF

3

14

3

19

3

23

ns

ten

OE

Any Q

2

9

2

11

2

11

ns

tdis

OE

Any Q

2

10

2

14

2

14

ns

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