NXP Semiconductors
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
11. Waveforms
V
CC
An, E3
input
GND
t
PHL
V
OH
Yn
output
V
OL
t
THL
t
TLH
mna373
V
M
t
PLH
V
M
Measurement points are given in
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 6.
Propagation delay input (An) and enable input (E3) to output (Yn) and transition time output (Yn)
V
CC
E1, E2
input
GND
t
PHL
V
OH
Yn
output
V
M
t
PLH
V
M
V
OL
t
THL
t
TLH
mna374
Measurement points are given in
V
OL
and V
OH
are typical voltage output levels that occur with the output load.
Fig 7.
Table 8.
Type
74HC138
Propagation delay enable input (En) to output (Yn) and transition time output (Yn)
Measurement points
Input
V
M
0.5V
CC
1.3 V
Output
V
M
0.5V
CC
1.3 V
74HCT138
74HC_HCT138
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 27 June 2012
9 of 19
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