參數(shù)資料
型號： MC3456P
廠商： MOTOROLA INC
元件分類： 運動控制電子
英文描述： DUAL TIMING CIRCUIT
中文描述： DUAL PULSE; RECTANGULAR, TIMER, PDIP14
封裝： PLASTIC, DIP-14
文件頁數(shù)： 8/10頁
文件大?。?/td> 200K
代理商： MC3456P
MC3456
8
MOTOROLA ANALOG IC DEVICE DATA
Pulse Width Modulation
If the timer is triggered with a continuous pulse train in the
monostable mode of operation, the charge time of the
capacitor can be varied by changing the control voltage at
Pin 3. In this manner, the output pulse width can be
modulated by applying a modulating signal that controls the
threshold voltage.
Test Sequences
Several timers can be connected to drive each other for
sequential timing. An example is shown in Figure 24 where
the sequence is started by triggering the first timer which runs
for 10 ms. The output then switches low momentarily and
starts the second timer which runs for 50 ms and so forth.
Figure 22. Pulse Width Modulation Waveforms
Figure 23. Pulse Width Modulation Circuit
t = 0.5 ms/cm
(RA = 10 kW, C = 0.02 mF, VCC = 15 V)
+VCC (5.0 V to 15 V)
RL
4 (10)
Reset
VCC
14
RA
Discharge
1 (13)
Threshold
2 (12)
Control
3 (11)
C
Modulation
Input
Output
5 (9)
Trigger
6 (8)
Output
Clock
Input
Gnd
7
1/2
MC3456
Modulation Input Voltage 5.0 V/cm
Clock Input Voltage
5.0 V/cm
Output Voltage
5.0 V/cm
Capacitor Voltage
5.0 V/cm
Figure 24. Sequential Timing Circuit
9.1 k
Threshold
VCC
Reset
27 k
9.1 k
VCC
Reset
27 k
50 k
VCC
Reset
Control
Output
Load
Gnd
Gnd
Load
5.0
μ
F
0.001
μ
F
Gnd
Trigger
Discharge
1.0
μ
F
Control
Output
0.01
μ
F
0.001
μ
F
Threshold
Threshold
Discharge
Trigger
5.0
μ
F
0.01
μ
F
Discharge
Trigger
Load
VCC (5.0 V to 15 V)
0.01
μ
F
Control
Output
1/2
MC3456
1/2
MC3456
1/2
MC3456
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