5-5

FAST AND LS TTL DATA

SN54/74LS196

• SN54/74LS197

Sb l

P

Limits

Ui

T

C

di i

Sb l

P

LS196

LS197

Ui

T

C

di i

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Unit

Test Conditions

fMAX

Maximum Clock Frequency

30

40

30

40

MHz

V5 0 V

tPLH

tPHL

CP0 Input to

Q0 Output

8.0

13

15

20

8.0

14

15

21

ns

V5 0 V

tPLH

tPHL

CP1 Input to

Q1 Output

16

22

24

33

12

23

19

35

ns

V5 0 V

tPLH

tPHL

CP1 Input to

Q2 Output

38

41

57

62

34

42

51

63

ns

VCC = 5.0 V

tPLH

tPHL

CP1 Input to

Q3 Output

12

30

18

45

55

63

78

95

ns

CC

CL = 15 pF

tPLH

tPHL

Data to Output

20

29

30

44

18

29

27

44

ns

tPLH

tPHL

PL Input to

Any Output

27

30

41

45

26

30

39

45

ns

tPHL

MR Input to Any Output

34

51

34

51

ns

Sb l

P

Limits

Ui

T

C

di i

Sb l

P

LS196

LS197

Ui

T

C

di i

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Unit

Test Conditions

tW

CP0 Pulse Width

20

20

ns

V5 0 V

tW

CP1 Pulse Width

30

30

ns

V5 0 V

tW

PL Pulse Width

20

20

ns

V5 0 V

tW

MR Pulse Width

15

15

ns

V5 0 V

ts

Data Input Setup Time — HIGH

10

10

ns

VCC = 5.0 V

ts

Data Input Setup Time — LOW

15

15

ns

th

Data Hold Time — HIGH

10

10

ns

th

Data Hold Time — LOW

10

10

ns

trec

Recovery Time

30

30

ns

DEFINITIONS OF TERMS

SETUP TIME (ts) — is defined as the minimum time required

for the correct logic level to be present at the logic input prior to

the clock transition from HIGH to LOW in order to be recog-

nized and transferred to the outputs.

HOLD TIME (th) — is defined as the minimum time following

the clock transition from HIGH to LOW that the logic level must

be maintained at the input in order to ensure continued recog-

nition. A negative HOLD TIME indicates that the correct logic

level may be released prior to the clock transition from HIGH to

LOW and still be recognized.

RECOVERY TIME (trec) — is defined as the minimum time

required between the end of the reset pulse and the clock

transition from HIGH to LOW in order to recognize and transfer

LOW Data to the Q outputs.