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)： 7/10頁
文件大?。?/td> 200K
代理商： MC3456P
MC3456
7
MOTOROLA ANALOG IC DEVICE DATA
APPLICATIONS INFORMATION
Tone Burst Generator
For a tone burst generator, the first timer is used as a
monostable and determines the tone duration when triggered
by a positive pulse at Pin 6. The second timer is enabled by
the high output of the monostable. It is connected as an
astable and determines the frequency of the tone.
Dual Astable Multivibrator
This dual astable multivibrator provides versatility not
available with single timer circuits. The duty cycle can be
adjusted from 5% to 95%. The two outputs provide two phase
clock signals often required in digital systems. It can also be
inhibited by use of either reset terminal.
(RA + 2RB) C
Figure 20. Tone Burst Generator
Figure 21. Dual Astable Multivibrator
RT
Trigger
Trigger
Trigger
Reset
4
Discharge
Threshold
7
Gnd
1/2
MC3456
14
VCC
5
Output
10
Reset
3
9
Control
0.01
μ
F
Output
7
Gnd
0.01 mF
C2
14
VCC
13 Discharge
12 Threshold
8
11 Control
RB
RA
+ 15 V
Gnd
C1–
R1
C1
Reset
2
Discharge
1
4
14
10 k
5
1N914
1N914
10 k
9
Output
Trigger
10
Reset
+15 V
R2
Threshold
12
13
Discharge
C2
Gnd
11
Control
Voltage
0.001
8
Output
0.001
Output
6
3
7
Gnd
f =
0.91
(R1 + R2) C
for C1 = C2
Duty Cycle
R2
R1 + R2
t = 1.1 RT C1
f =
1.44
Control
Voltage
Threshold
Trigger
1/2
MC3456
1/2
MC3456
1/2
MC3456
6
1
2
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