5-548

FAST AND LS TTL DATA

SN54/74LS390

• SN54/74LS393

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tW

Clock Pulse Width

LS393

20

ns

VCC = 5.0 V

tW

CP0 Pulse Width

LS390

20

ns

VCC = 5.0 V

tW

CP1 Pulse Width

LS390

40

ns

VCC = 5.0 V

tW

MR Pulse Width

LS390/393

20

ns

CC = 5.0 V

trec

Recovery Time

LS390/393

25

ns

AC WAVEFORMS

*The number of Clock Pulses required between tPHL and tPLH measurements can be determined from the appropriate Truth Table.

*CP

Q

Q

MR & MS

CP

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

tPHL

tPHL

tPLH

Figure 1

Figure 2

tW

tW

trec