MC74HC4020A ON Semiconductor, MC74HC4020A Datasheet - Page 5

• Manufacturer Part Number: MC74HC4020A
• Description: 14-Stage Binary Ripple Counter High-Performance Silicon-Gate CMOS
• Manufacturer: ON Semiconductor

NOTE: Information on typical parametric values can be found in Chapter 2 of the ON Semiconductor High−Speed CMOS Data Book
INPUTS
Clock (Pin 10)
transition on this input advances the state of the counter.
Reset (Pin 11)
asynchronously resets the counter to its zero state, thus
forcing all Q outputs low.
TIMING REQUIREMENTS
Symbol
Negative−edge triggering clock input. A high−to−low
Active−high reset. A high level applied to this input
t
Clock
t
t
t
r
rec
, t
w
w
Q1
f
(DL129/D).
10%
Minimum Recovery Time, Reset Inactive to Clock
(Figure 2)
Minimum Pulse Width, Clock
(Figure 1)
Minimum Pulse Width, Reset
(Figure 2)
Maximum Input Rise and Fall Times
(Figure 1)
50%
90%
90%
50%
10%
t
f
t
t
PLH
w
t
TLH
Figure 3.
1/f
(Input t
MAX
t
r
r
= t
t
PHL
f
Parameter
= 6 ns)
t
THL
SWITCHING WAVEFORMS
PIN DESCRIPTIONS
V
GND
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MC74HC4020A
CC
5
OUTPUTS
Q1, Q4—Q14 (Pins 9, 7, 5, 4, 6, 13, 12, 14, 15, 1, 2, 3)
input frequency by 2
Active−high outputs. Each Qn output divides the Clock
Any Q
Reset
Clock
V
2.0
3.0
4.5
6.0
2.0
3.0
4.5
6.0
2.0
3.0
4.5
6.0
2.0
3.0
4.5
6.0
V
CC
−55 to 25°C
N
.
1000
Figure 4.
800
500
400
30
20
70
40
15
13
70
40
15
13
5
4
Guaranteed Limit
t
PHL
50%
≤85°C
t
1000
w
800
500
400
40
25
80
45
19
16
80
45
19
16
t
8
6
rec
50%
50%
≤125°C
1000
800
500
400
50
30
12
90
50
24
20
90
50
24
20
9
V
GND
V
GND
Unit
CC
CC
ns
ns
ns
ns