Datasheet

74HC_HCT4020 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 5 — 6 August 2012 11 of 20
NXP Semiconductors
74HC4020; 74HCT4020
14-stage binary ripple counter
Test data is given in Table 9.
Definitions test circuit:
R
T
= Termination resistance should be equal to output impedance Z
o
of the pulse generator.
C
L
= Load capacitance including jig and probe capacitance.
Fig 10. Test circuit for measuring switching times
001aah768
t
W
t
W
t
r
t
r
t
f
V
M
V
I
negative
pulse
GND
V
I
positive
pulse
GND
10 %
90 %
90 %
10 %
V
M
V
M
V
M
t
f
V
CC
DUT
R
T
V
I
V
O
C
L
G
Table 9. Test data
Type Input Load
V
I
t
r
, t
f
C
L
74HC4020 V
CC
6 ns 15 pF, 50 pF
74HCT4020 3 V 6 ns 15 pF, 50 pF