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NE556 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. NE556
Description  GENERAL PURPOSE DUAL BIPOLAR TIMERS
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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NE556- SA556-SE556
6/8
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 or the monostable.
It is connected as an astable and determines the frequency of the tone.
MONOSTABLE OPERATION
ASTABLE OPERATION
t1 = 0.693 (RA + RB) C Output High
t2 = 0.693 RBC Output Low
RA
RB
Output
Reset
Output
Control
f =
1.44
R + 2R ) C
B
A
Ground
Ground
0.01m F
C2
Control
Trigger
Threshold
1/2
NE556
SE556
+15V
Discharge
11
12
8
13
14
9
5
3
10
0.01m F
Ground
1/2
NE556
SE556
Trigger
Threshold
C1
Discharge
Trigger
Reset
Vcc
4
14
6
1
2
R t
T = 1.1 R .C1
t
Output
R
1/2
NE556
SE556
A
(10)
(8)
(11)
(12)
VCC
(13)
RL
RL
7
6
2
1
4
14
3
C
10nF
(9)
5
Trigger
T = 1.1 R .C
A
Output
R
1/2
NE556
SE556
A
(10)
(9)
(11)
(12)
VCC
(13)
RL
RL
7
5
2
1
4
14
3
6
(8)
RB
C
Operating frequency
0.01nF
f =
1.44
R + 2R ) C
B
A
t2
t1




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