74HCT138D View Datasheet(PDF) - Nexperia B.V. All rights reserved
Part Name
Description
Manufacturer
74HCT138D Datasheet PDF : 16 Pages
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Nexperia
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Symbol Parameter Conditions
74HCT138
tpd
propagation An to Yn; see Fig. 7
delay
VCC = 4.5 V
VCC = 5 V; CL = 15 pF
E3 to Yn; see Fig. 7
VCC = 4.5 V
VCC = 5 V; CL = 15 pF
En to Yn; see Fig. 8
VCC = 4.5 V
VCC = 5 V; CL = 15 pF
tt
transition time Yn; see Fig. 7 and Fig. 8
VCC = 4.5 V
CPD
power
CL = 50 pF; f = 1 MHz;
dissipation VI = GND to VCC - 1.5 V
capacitance
Tamb = 25 °C
Min Typ Max
Tamb = -40 °C
to +85 °C
Min Max
Tamb = -40 °C Unit
to +125 °C
Min Max
[1]
-
20
35
-
44
-
53 ns
-
17
-
-
-
-
- ns
[1]
-
18
40
-
50
-
60 ns
-
19
-
-
-
-
- ns
[1]
-
19
40
-
50
-
60 ns
-
19
-
-
-
-
- ns
[2]
-
7
15
-
19
-
22 ns
[3] -
67
-
-
-
-
- pF
[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 + Σ(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;
Σ(CL × VCC2 × fo) = sum of outputs.
10.1. Waveforms and test circuit
Fig. 7.
VCC
An, E3
input
VM
GND
VOH
tPHL
tPLH
Yn
output
VOL
VM
tTHL
tTLH
mna373
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Propagation delay input (An) and enable input (E3) to output (Yn) and transition time output (Yn)
74HC_HCT138
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 7 April 2020
© Nexperia B.V. 2020. All rights reserved
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