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74HCT138N Datasheet(PDF) 8 Page - NXP Semiconductors

Part No. 74HCT138N
Description  3-to-8 line decoder/demultiplexer; inverting
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

74HCT138N Datasheet(HTML) 8 Page - NXP Semiconductors

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74HC_HCT138
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 4 — 27 June 2012
8 of 19
NXP Semiconductors
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
[1]
tpd is the same as tPLH and tPHL.
[2]
tt is the same as tTHL and tTLH.
[3]
CPD is used to determine the dynamic power dissipation (PD in
μW).
PD =CPD
× VCC2 × fi × N+ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
(C
L
× VCC2 × fo) = sum of outputs.
For type 74HCT138
tpd
propagation
delay
An to Yn; see Figure 6
[1]
VCC = 4.5 V
-
20
35
-
44
-
53
ns
VCC =5V; CL =15pF
-
17
-
-
-
-
-
ns
E3 to Yn; see Figure 6
[1]
VCC = 4.5 V
-
18
40
-
50
-
60
ns
VCC =5V; CL =15pF
-
19
-
-
-
-
-
ns
Ento Yn; see Figure 7
[1]
VCC = 4.5 V
-
19
40
-
50
-
60
ns
VCC =5V; CL =15pF
-
19
-
-
-
-
-
ns
tt
transition
time
Yn; see Figure 6 and
Figure 7
[2]
VCC = 4.5 V
-
7
15
-
19
-
22
ns
CPD
power
dissipation
capacitance
CL =50pF;f= 1 MHz;
VI =GND to VCC
[3]
-67
-
-
-
-
-
pF
Table 7.
Dynamic characteristics …continued
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 8.
Symbol Parameter
Conditions
Tamb = 25
°C
Tamb =
−40 °C
to +85
°C
Tamb =
−40 °C
to +125
°C
Unit
Min
Typ
Max
Min
Max
Min
Max


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