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74HC_HCT138 Datasheet(PDF) 10 Page - NXP Semiconductors

Part No. 74HC_HCT138
Description  3-to-8 line decoder/demultiplexer; inverting
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC_HCT138 Datasheet(HTML) 10 Page - NXP Semiconductors

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74HC_HCT138
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 5 — 26 January 2015
10 of 19
NXP Semiconductors
74HC138; 74HCT138
3-to-8 line decoder/demultiplexer; inverting
Test data is given in Table 9.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance.
RL = Load resistance.
S1 = Test selection switch.
Fig 8.
Test circuit for measuring switching times
Table 9.
Test data
Type
Input
Load
S1 position
VI
tr, tf
CL
RL
tPHL, tPLH
tPZH, tPHZ
tPZL, tPLZ
74HC138
VCC
6ns
15pF, 50 pF
1 k
open
GND
VCC
74HCT138
3 V
6 ns
15 pF, 50 pF
1 k
open
GND
VCC


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