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| 74HC238 Datasheet, PDF (10/18 Pages) NXP Semiconductors – 3-to-8 line decoder/demultiplexer | |||
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NXP Semiconductors
74HC238; 74HCT238
3-to-8 line decoder/demultiplexer
VI 90 %
tW
negative
pulse
VM
10 %
0V
tf
VI
positive
pulse
tr
90 %
VM
10 %
0V
tW
VM
tr
tf
VM
PULSE
VI
GENERATOR
VCC
VO
DUT
RT
VCC
RL S1
CL
open
001aad983
Test data is given in Table 9.
Deï¬nitions for 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. Load circuit for measuring switching times
Table 9. Test data
Type
Input
74HC238
74HCT238
VI
tr, tf
VCC
6 ns
3V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
RL
1 kâ¦
1 kâ¦
S1 position
tPHL, tPLH
open
open
74HC_HCT238_3
Product data sheet
Rev. 03 â 16 July 2007
© NXP B.V. 2007. All rights reserved.
10 of 18
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