SN54/74LS390
•
SN54/74LS393
AC SETUP REQUIREMENTS
(TA = 25°C, VCC = 5.0 V)
Limits
Symbol
S b l
tW
tW
tW
tW
trec
Parameter
P
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
U i
ns
ns
ns
ns
ns
VCC = 5.0 V
50
Test C di i
T
Conditions
AC WAVEFORMS
*CP
1.3 V
tW
tPHL
1.3 V
tPLH
1.3 V
Q
1.3 V
Figure 1
MR & MS
1.3 V
tW
CP
1.3 V
tPHL
Q
1.3 V
1.3 V
trec
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
5-5