NXP Semiconductors
74HC138-Q100; 74HCT138-Q100
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
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
74HC138-Q100
74HCT138-Q100
74HC_HCT138_Q100
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 16 July 2012
10 of 18
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