74HC137 查看數據表（PDF） - Philips Electronics
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74HC137 Datasheet PDF : 8 Pages
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Philips Semiconductors
3-to-8 line decoder/demultiplexer with
address latches; inverting
Product specification
74HC/HCT137
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
E1
E2
LE
UNIT LOAD COEFFICIENT
1.50
1.50
1.50
1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
SYMBO L PARAMETER
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tTHL/ tTLH
propagation delay
An to Yn
propagation delay
LE to Yn
propagation delay
E1 to Yn
propagation delay
E2 to Yn
output transition time
Tamb (°C)
74HCT
+25
−40 to +85
min. typ. max. min. max.
22 38
48
25 44
55
20 37
46
18 35
44
7 15
19
UNIT
−40 to +125
min. max.
57 ns
66 ns
56 ns
53 ns
22 ns
TEST CONDITIONS
VCC WAVEFORMS
(V)
4.5 Fig.6
4.5 Fig.7
4.5 Fig.7
4.5 Fig.6
4.5 Fig.6
tW
LE pulse width
HIGH
10 5
tsu
set-up time
An to LE
10 2
th
hold time
An to LE
7
2
13
15
13
15
9
11
ns
4.5 Fig.8
ns
4.5 Fig.8
ns
4.5 Fig.8
December 1990
6
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