74HC4020DB 데이터 시트보기 (PDF) - Nexperia B.V. All rights reserved
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74HC4020DB Datasheet PDF : 17 Pages
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Nexperia
74HC4020; 74HCT4020
14-stage binary ripple counter
VOH
Qn output
VM
VOL
VOH
tPLH
tPHL
Qn+1 output
VM
Fig. 9.
VOL
001aai120
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Waveforms showing the output Qn to output Qn+1 propagation delays
Table 8. Measurement points
Type
74HC4020
74HCT4020
Input
VM
0.5 x VCC
1.3 V
Output
VM
0.5 x VCC
1.3 V
VI 90 %
negative
pulse
GND
VI
positive
pulse
GND 10 %
VM
10 %
tf
tr
90 %
VM
VI
G
RT
tW
tW
VCC
DUT
VM
tr
tf
VM
VO
CL
001aah768
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.
Fig. 10. Test circuit for measuring switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC4020
VCC
6 ns
74HCT4020
3V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
74HC_HCT4020
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 18 June 2020
© Nexperia B.V. 2020. All rights reserved
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