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參數資料
| 型號： | N555 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PRECISION TIMERS |
| 中文描述： | 精密定時器 |
| 文件頁數： | 10/24頁 |
| 文件大小： | 356K |
| 代理商： | N555 |
www.ti.com
t
C Capacitance
μ
F
10
1
10
1
10
2
10
3
10
4
100
10
1
0.1
0.01
10
5
0.001
R
A
= 10 M
R
A
= 10 k
R
A
= 1 k
R
A
= 100 k
R
A
= 1 M
V
Time 0.1 ms/div
(see Note A)
5
CONT
RESET
DISCH
Capacitor Voltage
Output Voltage
Input Voltage
Astable Operation
As shown in
Figure 12
, adding a second resistor, R
B
, to the circuit of
Figure 9
and connecting the trigger input to
the threshold input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through
R
A
and R
B
and then discharges through R
B
only. Therefore, the duty cycle is controlled by the values of R
A
and
R
B
.
This astable connection results in capacitor C charging and discharging between the threshold-voltage level
(
≈
0.67
×
V
CC
) and the trigger-voltage level (
≈
0.33
×
V
CC
). As in the monostable circuit, charge and discharge
times (and, therefore, the frequency and duty cycle) are independent of the supply voltage.
R
A
= 9.1 k
C
L
= 0.01
μ
F
R
L
= 1 k
See Figure 9
V
Time 0.5 ms/div
tH
t
L
Capacitor Voltage
Output Voltage
R
A
= 5 k
R
B
= 3 k
C = 0.15
μ
F
R
L
= 1 k
See Figure 12
GND
1
OUT
V
CC
THRES
TRIG
C
R
B
R
A
Output
R
L
V
CC
(5 V to 15 V)
NOTE A: Decoupling CONT voltage to ground with a capacitor can
improve operation. This should be evaluated for individual
applications.
Open
8
4
7
6
2
3
Pin numbers shown are for the D, JG, P, PS, and PW packages.
NA555, NE555, SA555, SE555
PRECISION TIMERS
SLFS022F–SEPTEMBER 1973–REVISED JUNE 2006
APPLICATION INFORMATION (continued)
Figure 10. Typical Monostable Waveforms
Figure 11. Output Pulse Duration vs Capacitance
Figure 12. Circuit for Astable Operation
10
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