
A
tPLH
Y
VALID
50%
50% VCC
MC74VHC138
SWITCHING WAVEFORMS
VALID
VCC
GND
tPHL
E3
tPHL
Y
50%
50% VCC
Figure 2.
Figure 3.
VCC
GND
tPLH
E2 or E1 50%
Y
tPHL
50% VCC
VCC
GND
tPLH
Figure 4.
DEVICE
UNDER
TEST
TEST POINT
OUTPUT
CL*
*Includes all probe and jig capacitance
Figure 5. Test Circuit
INPUT
Figure 6. Input Equivalent Circuit
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