74HCT138U 查看數據表（PDF） - Philips Electronics
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74HCT138U Datasheet PDF : 7 Pages
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Philips Semiconductors
3-to-8 line decoder/demultiplexer; inverting
Product specification
74HC/HCT138
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications. To
determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
An
En
E3
UNIT LOAD COEFFICIENT
1.50
1.25
1.00
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HCT
+25
−40 to +85
min. typ. max. min. max.
−40 to +125
min. max.
UNIT
VCC WAVEFORMS
(V)
tPHL/ tPLH
propagation delay
An to Yn
20 35
44
53
ns
4.5 Fig.6
tPHL/ tPLH
propagation delay
E3 to Yn
18 40
50
60
ns
4.5 Fig.6
tPHL/ tPLH
propagation delay
En to Yn
19 40
50
60
ns
4.5 Fig.7
tTHL/ tTLH
output transition
time
7 15
19
22
ns
4.5 Figs 6 and 7
September 1993
6
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