5-78

FAST AND LS TTL DATA

SN54/74LS75

D SN54/74LS77

LOGIC DIAGRAM

DATA

ENABLE

TO OTHER LATCH

Q (SN54/74LS75 ONLY)

Q

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

54, 74

– 0.4

mA

IOL

Output Current — Low

54

74

4.0

8.0

mA

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tW

Enable Pulse Width High

20

ns

VCC = 5.0 V

ts

Setup Time

20

ns

VCC = 5.0 V

th

Hold Time

0

ns

CC = 5.0 V

AC WAVEFORMS

D

E

Q

Q

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

th

ts

tPLH

tPLH

tPHL

tPHL

tPLH

tPHL

tPHL

tPLH

DEFINITION 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 recognized 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 recognition. 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.