SL74LS157
AC ELECTRICAL CHARACTERISTICS (TA=25°C, VCC = 5.0 V, CL = 15 pF, RL = 2 kW, tr =15
ns, tf = 6.0 ns)
Symbol
Parameter
Min
Max
14
Unit
ns
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Propagation Delay, Input A or B to Output Y
Propagation Delay, Input A or B to Output Y
Propagation Delay, Select to Output Y
14
ns
23
ns
Propagation Delay, Select to Output Y
27
ns
Propagation Delay, Output Enable to Output Y
Propagation Delay, Output Enable to Output Y
20
ns
21
ns
Figure 1. Switching Waveforms
Figure 2. Switching Waveforms
NOTES A. CL includes probe and jig capacitance.
B. All diodes are 1N916 or 1N3064.
Figure 3. Test Circuit
System Logic
SLS