NE556D_03 查看數據表（PDF） - STMicroelectronics
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NE556D_03 Datasheet PDF : 8 Pages
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NE556- SA556-SE556
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.
Reset 4
Vcc
Rt
Trigger
Trigger
6
Discharge
1
1/2
NE556
SE556
2
Threshold
C1
Ground
14
5
Output
Control
3
0.01m F
T = 1.1 R t .C1
MONOSTABLE OPERATION
VCC
RL
RA
4
14
Trigger
(10)
6 (8)
(13) 1
1/2
NE556
SE556
Output
RL
5 (9)
7
(12)
2
(11)
3
10nF
C
T = 1.1 R A .C
10
Reset
Output
9
14
1/2
NE556
SE556
+15V
RA
Discharge
13
RB
12 Threshold
8 Trigger
11 Control
Ground 0.01m F
C2
1.44
f=
R A + 2RB ) C
Ground
ASTABLE OPERATION
VCC
RL
RA
4
14
(10)
(13) 1
1/2
Output
5 (9)
NE556
SE556
RB
(12)
RL
(11)
(8) 2
7
3
6
C
0.01nF
Operating frequency
1.44
f=
R A + 2RB ) C
t1 = 0.693 (RA + RB) C Output High
t2 = 0.693 RBC Output Low
t2
t1
6/8
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