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MC74HC4020ADTR2G

P1-P3P4-P6P7-P8
MC74HC4020A
http://onsemi.com
4
PIN DESCRIPTIONS
INPUTS
Clock (Pin 10)
Negative−edge triggering clock input. A high−to−low
transition on this input advances the state of the counter.
Reset (Pin 11)
Active−high reset. A high level applied to this input
asynchronously resets the counter to its zero state, thus
forcing all Q outputs low.
OUTPUTS
Q1, Q4—Q14 (Pins 9, 7, 5, 4, 6, 13, 12, 14, 15, 1, 2, 3)
Active−high outputs. Each Qn output divides the Clock
input frequency by 2
N
.
SWITCHING WAVEFORMS
t
f
Clock
Q1
V
CC
GND
90%
50%
10%
t
r
t
w
90%
50%
10%
t
PHL
1/f
MAX
t
PLH
t
TLH
t
THL
Clock
V
CC
GND
t
w
t
rec
50%
Figure 2.
Reset
V
CC
GND
50%
Any Q 50%
t
PHL
Figure 3.
50%
Qn
V
CC
GND
50%
Qn+1
C
L
*
*Includes all probe and jig capacitance
TEST
POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 4. Figure 5. Test Circuit
t
PLH
t
PHL
MC74HC4020A
http://onsemi.com
5
Figure 6. Expanded Logic Diagram
Clock
10
C
C
R
Reset
11
Q
Q
C
C
R
Q
Q
Q1
9
C
C
Q
Q
C
C
Q
Q
C
C
Q
Q
C
C
Q
Q4
7
Q5
5
Q12
1
Q13
2
Q14
3
Q6 = Pin 4
Q7 = Pin 6
Q8 = Pin 13
Q9 = Pin 12
Q10 = Pin 14
Q11 = Pin 15
V
CC
= Pin 16
GND = Pin 8
Clock
Reset
Q4
1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384
Q5
Q6
Q7
Q8
Q9
Q10
Q12
Q13
Q14
Figure 7. Timing Diagram
MC74HC4020A
http://onsemi.com
6
APPLICATIONS INFORMATION
Time−Base Generator
A 60Hz sinewave obtained through a 1.0 Megohm resistor
connected directly to a standard 120 Vac power line is
applied to the input of the MC54/74HC14A, Schmitt-trigger
inverter. The HC14A squares−up the input waveform and
feeds the HC4020A. Selecting outputs Q5, Q10, Q11, and
Q12 causes a reset every 3600 clocks. The HC20 decodes the
counter outputs, produces a single (narrow) output pulse,
and resets the binary counter. The resulting output frequency
is 1.0 pulse/minute.
HC4020A
Figure 8. Time−Base Generator
Clock Q5
Q10
Q11
Q12
V
CC
13
12
10
9
1
2
4
5
8
1/2
HC20
1/2
HC20
6
1/6 of HC14A
≥20pF
1.0M
1.0 Pulse/Minute
Output
V
CC
120Vac
60Hz
NOTE: Ground MUST be isolated
by a transformer or
opto−isolator for safety
reasons.
ORDERING INFORMATION
Device Package Shipping
†
MC74HC4020ADG SOIC−16
(Pb−Free)
48 Units / Rail
MC74HC4020ADR2G SOIC−16
(Pb−Free)
2500 / Tape & Reel
MC74HC4020ADTR2G TSSOP−16
(Pb−Free)
2500 / Tape & Reel
NLV74HC4020ADTR2G* TSSOP−16
(Pb−Free)
2500 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
*NLV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100 Qualified and PPAP
Capable.
P1-P3P4-P6P7-P8

MC74HC4020ADTR2G

Mfr. #:
Buy MC74HC4020ADTR2G
Manufacturer:
ON Semiconductor
Description:
Counter Shift Registers 2-6V Monolithic WFR Binary
Lifecycle:
New from this manufacturer.
Delivery:
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