HD74HCT238 Datasheet, PDF (4/6 Pages) Hitachi Semiconductor – 3-to-8-line Decoder/Demultiplexer

HD74HCT238
Test Circuit
V_CC
Input
Pulse Generator
Zout = 50 Ω
Input
Pulse Generator
Zout = 50 Ω
V_CC
A
B
C
G1
G2A
G2B
Output
Y0
Output
Y7
C_L = 50 pF
C_L = 50 pF
Note : 1. C_L includes probe and jig capacitance.
Waveforms
Input
t_r
10 %
90 %
1.3 V
t_PLH
t_f
90 %
1.3 V
10 %
t_PHL
V_CC
0V
Same-phase output
1.3 V
10 %
90 %
t_PHL ^tTLH
90 %
1.3 V
10 %
t_PLH
t_THL
V_OH
V_OL
Inverse-phase output
90 %
1.3 V
10 %
90 %
V_OH
1.3 V
10 %
V_OL
t_THL
t_TLH
Notes: 1. Input waveform: PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
2. The output are measured one at a time with one transition per measurement.
Rev.2.00 Mar 30, 2006 page 4 of 5