Datasheet

5-5
FAST AND LS TTL DATA
SN54/74LS390 • SN54/74LS393
AC SETUP REQUIREMENTS (T
A
= 25°C, V
CC
= 5.0 V)
Sbl
P
Limits
Ui
T C di i
Symbol Parameter
Min Typ Max
Unit Test Conditions
t
W
Clock Pulse Width LS393 20 ns
V50V
t
W
CP
0
Pulse Width LS390 20 ns
V50V
t
W
CP
1
Pulse Width
LS390 40 ns
V
CC
= 5.0 V
t
W
MR Pulse Width LS390/393 20 ns
t
rec
Recovery Time LS390/393 25 ns
AC WAVEFORMS
*The number of Clock Pulses required between t
PHL
and t
PLH
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
t
PHL
t
PHL
t
PLH
Figure 1
Figure 2
t
W
t
W
t
rec