MC74HC4040A Datasheet, PDF (4/8 Pages) ON Semiconductor – 12-Stage Binary Ripple Counter

MC74HC4040A
TIMING REQUIREMENTS (Input tr = tf = 6 ns)
Symbol
Parameter
VCC
Guaranteed Limit
V –55 to 25°C ≤85°C
≤125°C Unit
trec
Minimum Recovery Time, Reset Inactive to Clock
(Figure 2)
2.0
30
3.0
20
4.5
5
6.0
4
40
50
ns
25
30
8
12
6
9
tw
Minimum Pulse Width, Clock
(Figure 1)
2.0
70
3.0
40
4.5
15
6.0
13
80
90
ns
45
50
19
24
16
20
tw
Minimum Pulse Width, Reset
(Figure 2)
2.0
70
3.0
40
4.5
15
6.0
13
80
90
ns
45
50
19
24
16
20
tr, tf
Maximum Input Rise and Fall Times
(Figure 1)
2.0
1000
1000
1000
ns
3.0
800
800
800
4.5
500
500
500
6.0
400
400
400
NOTE: Information on typical parametric values can be found in Chapter 2 of the ON Semiconductor High–Speed CMOS Data Book
(DL129/D).
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.
OUTPUTS
Q1 thru Q12 (Pins 9, 7, 6, 5, 3, 2, 4, 13, 12, 14, 15, 1)
Active–high outputs. Each Qn output divides the Clock
input frequency by 2N.
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.
SWITCHING WAVEFORMS
tf
tr
90%
VCC
Clock
50%
10%
GND
tw
1/fMAX
tPLH
tPHL
90%
Q1 _50%
10%
tTLH
tTHL
Figure 1.
Clock
Reset
Any Q
VCC
50%
GND
trec
tw
VCC
50%
GND
tPHL
50%
Figure 2.
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