HD74LVC138 데이터 시트보기 (PDF) - Renesas Electronics
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HD74LVC138 Datasheet PDF : 6 Pages
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HD74LVC138
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
VCC
A
B
Y0 to Y 7
Output
C
CL =
50 pF
450 Ω
50 Ω Scope
G1
G 2A
G 2B
Note: 1. CL includes probe and jig capacitance.
Waveforms
Notes:
Input
In phase output
10 %
tr
90 %
Vref
tPLH
Vref
tPHL
tf
90 %
Vref
10 %
tPHL
Vref
tPLH
VIH
GND
VOH
VOL
Out of
phase output
Vref
Vref
VOH
VOL
Symbol
VCC = 2.7 V,
3.3±0.3 V VCC = 5.0±0.5 V
VIH
2.7 V
VCC
Vref
1.5 V
50%VCC
1. tr = 2.5 ns, tf = 2.5 ns
2. Input waveform : PRR = 10 MHz, duty cycle 50%
Rev.3.00 Jul. 23, 2004 page 4 of 5
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