SN54ACT8997, SN74ACT8997

SCAN-PATH LINKERS WITH 4-BIT IDENTIFICATION BUSES

SCAN-CONTROLLED IEEE STD 1149.1 (JTAG) TAP CONCATENATORS

SCAS157D – APRIL 1990 – REVISED DECEMBER 1996

21

POST OFFICE BOX 655303

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

temperature (see Figure 9)

PARAMETER

FROM

TO

SN54ACT8997

SN74ACT8997

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

UNIT

f

TCK

20

20

MHz

fmax

DCI (count mode)

20

20

MHz

tPLH

TCK

DTCK

2

14

3

12

ns

tPHL

TCK

DTCK

2

16

3

14

ns

tPLH

TCK

↓

TDO

7

28

9

25

ns

tPHL

TCK

↓

TDO

7

26

9

24

ns

tPLH

TCK

↓

Any DTDO

7

27

9

25

ns

tPHL

TCK

↓

Any DTDO

7

26

9

24

ns

tPLH

TCK

↓

Any DTMS

9

31

11

29

ns

tPHL

TCK

↓

Any DTMS

9

31

12

29

ns

tPLH

TCK

↓

DCO (open drain)

9

33

12

31

tPLH

TCK

↓

DCO (3 state)

9

32

12

30

ns

tPHL

TCK

↓

DCO (open drain)

9

34

12

32

ns

tPHL

TCK

↓

DCO (3 state)

9

31

12

29

tPLH

TMS

Any DTMS

4

21

6

19

ns

tPHL

TMS

Any DTMS

5

23

7

21

ns

tPLH

MCI

MCO

5

23

7

20

ns

tPHL

MCI

MCO

5

22

7

20

ns

tPLH

DCI

DCO (open drain)

9

30

11

27

tPLH

DCI

DCO (3 state)

6

29

10

26

ns

tPHL

DCI

DCO (open drain)

7

29

10

25

ns

tPHL

DCI

DCO (3 state)

6

26

9

23

tPHZ

TCK

↓

TDO

3

17

5

15

ns

tPLZ

TCK

↓

TDO

3

16

4

14

ns

tPHZ

TCK

↓

Any DTDO

5

19

5

17

ns

tPLZ

TCK

↓

Any DTDO

5

20

7

18

ns

tPHZ

TCK

↓

Any DTMS

6

23

7

21

ns

tPLZ

TCK

↓

Any DTMS

6

28

9

26

ns

tPHZ

TCK

↓

DCO

6

23

9

21

ns

tPLZ

TCK

↓

DCO

6

24

9

22

ns

tPZH

TCK

↓

TDO

8

30

10

27

ns

tPZL

TCK

↓

TDO

8

31

10

28

ns

tPZH

TCK

↓

Any DTDO

9

31

11

28

ns

tPZL

TCK

↓

Any DTDO

9

33

11

30

ns

tPZH

TCK

↓

Any DTMS

8

31

11

29

ns

tPZL

TCK

↓

Any DTMS

10

35

13

33

ns

tPZH

TCK

↓

DCO

9

37

14

35

ns

tPZL

TCK

↓

DCO

8

35

13

32

ns