SN74LS390 参数 Datasheet PDF下载

SN54/74LS390

•

SN54/74LS393

AC SETUP REQUIREMENTS

(TA = 25°C, VCC = 5.0 V)

Limits

Symbol

tW

tW

tW

tW

trec

Parameter

Clock Pulse Width

CP0 Pulse Width

CP1 Pulse Width

MR Pulse Width

Recovery Time

LS393

LS390

LS390

LS390/393

LS390/393

Min

20

20

40

20

25

Typ

Max

Unit

ns

ns

ns

ns

ns

VCC = 5.0 V

Test Conditions

AC WAVEFORMS

*CP

1.3 V

tPHL

1.3 V

tW

1.3 V

tPLH

1.3 V

Q

Figure 1

MR & MS

1.3 V

CP

tPHL

Q

1.3 V

tW

1.3 V

trec

1.3 V

Figure 2

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

FAST AND LS TTL DATA

5-548