HD74HC238 Datasheet, PDF (4/7 Pages) Hitachi Semiconductor – 3-to-8-line Decoder/Demultiplexer

HD74HC238
Switching Characteristics
Item
Propagation delay
time
Output rise/fall
time
Input capacitance
Symbol V_CC (V)
t_PLH
2.0
t_PHL
4.5
6.0
2.0
4.5
6.0
t_TLH
2.0
t_THL
4.5
6.0
Cin
—
Ta = 25°C
Min Typ Max
— — 150
— 15 30
— — 26
— — 150
— 13 30
— — 26
— — 75
— 5 15
— — 13
— 5 10
(C_L = 50 pF, Input t_r = t_f = 6 ns)
Ta = –40 to +85°C
Unit
Min
Max
Test Conditions
—
190 ns Select to Y
—
38
—
33
—
190 ns Enable to Y
—
38
—
33
—
95
ns
—
19
—
16
—
10 pF
Test Circuit
Measurement point
C_L*
Note: C_L includes the probe and fig capacitance.
Waveforms
t_r
t_f
90 %
90 %
V_CC
Input
50 %
50 %
10 %
10 %
0V
t_PLH
t_PHL
Same-phase output
50 %
10 %
90 %
t_PHL ^tTLH
90 %
V_OH
50 %
10 %
V_OL
t_PLH
t_THL
Inverse-phase output
90 %
50 %
10 %
90 %
V_OH
50 %
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 Jan 31, 2006 page 4 of 6