74HC237 데이터 시트보기 (PDF) - Philips Electronics
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74HC237 Datasheet PDF : 9 Pages
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Philips Semiconductors
3-to-8 line decoder/demultiplexer with
address latches
Product specification
74HC/HCT237
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
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
min.
+25
typ. max.
74HCT
−40 to +85
min. max.
−40 to +125
min. max.
UNIT VCC
(V)
WAVEFORMS
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
22 38
48
57 ns 4.5 Fig.6
25 42
53
63 ns 4.5 Fig.7
20 35
44
53 ns 4.5 Fig.7
20 33
41
50 ns 4.5 Fig.6
7 15
19
22 ns 4.5 Fig.6
tW
LE pulse width
HIGH
tsu
set-up time
An to LE
th
hold time
An to LE
10 5
10 2
50
13
15
13
15
5
5
ns 4.5 Fig.8
ns 4.5 Fig.8
ns 4.5 Fig.8
December 1990
7
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