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74HC138 Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. 74HC138
Description  3-to-8 line decoder/demultiplexer; inverting
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo 

   
 6 page
background image
September 1993
6
Philips Semiconductors
Product specification
3-to-8 line decoder/demultiplexer; inverting
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.
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
INPUT
UNIT LOAD COEFFICIENT
An
1.50
En
1.25
E3
1.00
SYMBOL
PARAMETER
Tamb (°C)
UNIT
TEST CONDITIONS
74HCT
VCC
(V)
WAVEFORMS
+25
−40 to +85
−40 to +125
min.
typ.
max.
min.
max.
min.
max.
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




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