74HC251 查看數據表（PDF） - NXP Semiconductors.
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74HC251 Datasheet PDF : 18 Pages
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Nexperia
74HC251; 74HCT251
8-input multiplexer; 3-state
9,
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Fig 9.
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.
Test circuit for measuring switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC251
VCC
6 ns
74HCT251
3V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
RL
1 k
1 k
S1 position
tPHL, tPLH
open
open
tPZH, tPHZ
GND
GND
tPZL, tPLZ
VCC
VCC
74HC_HCT251
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 1 February 2016
.
11 of 18
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