54ACT16821, 74ACT16821

20BIT BUSINTERFACE FLIPFLOPS

WITH 3STATE OUTPUTS

SCAS176A − JANUARY 1991 − REVISED APRIL 1996

5

POST OFFICE BOX 655303

POST OFFICE BOX 1443

switching characteristics over recommended operating free-air temperature range,

PARAMETER

FROM

TO

TA = 25°C

54ACT16821

74ACT16821

UNIT

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

fmax

70

70

70

MHz

tPLH

CLK

Any Q

4.5

8.8

12

4.5

13.4

4.5

13.4

ns

tPHL

CLK

Any Q

5.2

9.5

12.6

5.2

14

5.2

14

ns

tPZH

OE

Any Q

2.8

8.6

10.8

2.8

11.9

2.8

11.9

ns

tPZL

OE

Any Q

4

9.7

13.3

4

14.7

4

14.7

ns

tPHZ

OE

Any Q

5.4

8.3

10

5.4

10.7

5.4

10.7

ns

tPLZ

OE

Any Q

4.7

7.6

9.3

4.7

10

4.7

10

ns

PARAMETER

TEST CONDITIONS

TYP

UNIT

Cpd

Power dissipation capacitance per flip-flop

Outputs enabled

CL = 50 pF,

f = 1 MHz

41

pF

Cpd

Power dissipation capacitance per flip-flop

Outputs disabled

CL = 50 pF,

f = 1 MHz

25

pF

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.