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參數(shù)資料
| 型號： | MC3456 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | DUAL TIMING CIRCUIT |
| 中文描述： | 雙定時電路 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 200K |
| 代理商： | MC3456 |
MC3456
6
MOTOROLA ANALOG IC DEVICE DATA
Figure 15. Monostable Circuit
Figure 16. Monostable Waveforms
Figure 17. Astable Circuit
(RA = 10 k
, C = 0.01
μ
F, RL = 1.0 k
, VCC = 15 V)
t = 20
μ
s/cm
(RA = 5.1 k
, C = 0.0 1
μ
F, RL = 1.0 k
, RB = 3.9 k
, VCC = 15 V)
t = 50
μ
s/cm
Figure 18. Astable Waveforms
Control
Voltage
3 (11)
RL
+VCC (5.0 to 15 V)
Reset
4 (10)
VCC
14
Discharge
1 (13)
2 (12)
Threshold
0.01
μ
F
7
6 (8)
Trigger
Output
5 (9)
RA
RL
C
Gnd
1/2
MC3456
RB
RL
+VCC (5.0 V to 15 V)
Reset
4 (10)
VCC
14
Discharge
1 (13)
2 (12)
Threshold
Control
Voltage
0.01
μ
F
7
6 (8)
Trigger
Output
5 (9)
RA
RL
C
3 (11)
Gnd
1/2
MC3456
Pin numbers in parenthesis ( ) indicate B–Channel
Astable Mode
In the astable mode the timer is connected so that it will
retrigger itself and cause the capacitor voltage to oscillate
between 1/3 VCC and 2/3 VCC (see Figure 17).
The external capacitor charges to 2/3 VCC through RA and
RB and discharges to 1/3 VCC through RB. By varying the
ratio of these resistors the duty cycle can be varied. The
charge and discharge times are independent of the supply
voltage.
The charge time (output high) is given by:
t1 = 0.695 (RA+RB) C
The discharge time (output low) by:
t2 = 0.695 (RB) C
Thus the total period is given by:
T = t1 + t2 = 0.695 (RA + 2RB) C
The frequency of oscillation is then: f =1
T=(RA +2RB) C
1.44
and may be easily found as shown in Figure 19.
RA +2RB
RB
The duty cycle is given by: DC =
To obtain the maximum duty cycle, RA must be as small as
possible; but it must also be large enough to limit the
discharge current (Pin 7 current) within the maximum rating
of the discharge transistor (200 mA).
The minimum value of RA is given by:
VCC (Vdc)
I7 (A)
RA
≥
≥
VCC (Vdc)
0.2
Figure 19. Free Running Frequency
C
μ
100
10
1.0
0.1
0.01
0.001
(RA + 2 RB)
0.1
1.0
10
100
1.0 k
10 k
100 k
f, FREE RUNNING FREQUENCY (Hz)
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