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74HCT138N Datasheet(PDF) 9 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) 9 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
9 of 19
NXP Semiconductors
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
11. Waveforms
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6.
Propagation delay input (An) and enable input (E3) to output (Yn) and transition time output (Yn)
mna373
An, E3
input
Yn
output
tPHL
tTHL
tPLH
GND
VCC
VM
VM
VOH
VOL
tTLH
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7.
Propagation delay enable input (En) to output (Yn) and transition time output (Yn)
mna374
E1, E2
input
Yn
output
tPHL
tPLH
GND
VCC
VM
VM
VOH
VOL
tTHL
tTLH
Table 8.
Measurement points
Type
Input
Output
VM
VM
74HC138
0.5VCC
0.5VCC
74HCT138
1.3 V
1.3 V


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