SN74ACT7814-40DL datasheet(7/16 Pages) TI1

Part #	SN74ACT7814-40DL

Description	64 x 18 STROBED FIRST-IN, FIRST-OUT MEMORY

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SN74ACT7814

64

× 18 STROBED FIRST-IN, FIRST-OUT MEMORY

SCAS209C – APRIL 1992 – REVISED APRIL 1998

7

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

timing requirements over recommended operating conditions (see Figures 1 through 3)

’ACT7814-20

’ACT7814-25

’ACT7814-40

UNIT

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

50

40

25

MHz

LDCK high or low

7

8

12

t

Pulse duration

UNCK high or low

7

8

12

ns

tw

Pulse duration

PEN low

7

8

12

ns

RESET low

10

12

D0–D17 before LDCK

↑

5

tsu

Setup time

PEN before LDCK

↑

5

ns

LDCK inactive before RESET high

5

6

D0–D17 after LDCK

↑

0

th

Hold time

LDCK inactive after RESET high

5

6

ns

th

Hold time

PEN low after LDCK

↑

3

ns

PEN high after LDCK

↓

0

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

temperature, CL = 50 pF (unless otherwise noted) (see Figure 3)

PARAMETER

FROM

TO

’ACT7814-20

’ACT7814-25

’ACT7814-40

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP†

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

LDCK or UNCK

50

40

25

MHz

t d

LDCK

↑

Any Q

9

20

9

22

9

24

ns

tpd

UNCK

↑

Any Q

6

11.5

15

6

18

6

20

ns

tpd‡

UNCK

↑

Any Q

10.5

ns

tPLH

LDCK

↑

EMPTY

6

15

6

17

6

19

ns

UNCK

↑

EMPTY

6

15

6

17

6

19

tPHL

RESET low

EMPTY

4

16

4

18

4

20

ns

PHL

LDCK

↑

FULL

6

15

6

17

6

19

tPLH

UNCK

↑

FULL

6

15

6

17

6

19

ns

tPLH

RESET low

FULL

4

18

4

20

4

22

ns

t d

LDCK

↑

AF/AE

7

18

7

20

7

22

ns

tpd

UNCK

↑

AF/AE

7

18

7

20

7

22

ns

tPLH

RESET low

AF/AE

2

10

2

12

2

14

ns

tPLH

LDCK

↑

HF

5

18

5

20

5

22

ns

tPHL

UNCK

↑

HF

7

18

7

20

7

22

ns

tPHL

RESET low

HF

3

12

3

14

3

16

ns

ten

OE

Any Q

2

9

2

10

2

11

ns

tdis

OE

Any Q

2

10

2

11

2

12

ns

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

‡ This parameter is measured at CL = 30 pF (see Figure 4).

operating characteristics, VCC = 5 V, TA = 25°C

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance per FIFO channel

Outputs enabled

CL = 50 pF,

f = 5 MHz

53

pF

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