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NE556D Datasheet PDF : 10 Pages
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MC3456
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.
Figure 20. Tone Burst Generator
RT
Trigger
C1–
Reset
4
14 VCC
6
Trigger
1
Discharge
2
Threshold
1/2
MC3456
7 Gnd
5
Output
3
Control
0.01 µF
10
Reset
9
Output
14 VCC
13 Discharge
1/2
MC3456
12 Threshold
8 Trigger
11 Control
0.01 mF
7 Gnd
t = 1.1 RT C1
1.44
f=
(RA + 2RB) C
+ 15 V
RA
RB
C2
Gnd
Figure 21. Dual Astable Multivibrator
R1
Reset
2
Threshold
1
Discharge
Control
C1
Voltage
4
1/2
MC3456
37
14 10 k
5
Output
6
Trigger
Gnd
1N914
1N914
0.001
0.001
Output
10 k
9
Output
8
Trigger
+15 V
10 Reset
R2
1/2
MC3456
12
Threshold
13
Discharge
11 Control
Voltage
C2
Gnd
0.91
f = (R1 + R2) C for C1 = C2
R2
Duty Cycle R1 + R2
MOTOROLA ANALOG IC DEVICE DATA
7
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