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

20

POST OFFICE BOX 655303

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

temperature

SN54ACT8997

SN74ACT8997

UNIT

MIN

MAX

MIN

MAX

UNIT

f lk

Clock frequency

TCK

0

20

0

20

MHz

fclock

Clock frequency

DCI (count mode)

0

20

0

20

MHz

TCK high or low

12

12

tw

Pulse duration

DCI high or low (count mode)

7

7

ns

TRST low

7

7

TMS before TCK

↑

8

8

TDI before TCK

↑

9

9

t

Setup time

Any DTDI before TCK

↑

7

7

ns

tsu

Setup time

MCI before TCK

↑

3

3

ns

DCI before TCK

↑

3

2

Any ID before TCK

↑

2

2

TMS after TCK

↑

2

2

TDI after TCK

↑

2

2

th

Hold time

Any DTDI after TCK

↑

2

2

ns

th

Hold time

MCI after TCK

↑

4

4

ns

DCI after TCK

↑

4

4

Any ID after TCK

↑

4

4

td

Delay time

Power up to TCK

↑

100*

100

ns

* On products compliant to MIL-PRF-38535, this parameter is not production tested.