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| 型號(hào)： | N555 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | PRECISION TIMERS |
| 中文描述： | 精密定時(shí)器 |
| 文件頁(yè)數(shù)： | 11/24頁(yè) |
| 文件大?。?/td> | 356K |
| 代理商： | N555 |
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tH
tL
0.693 (RA
0.693 (RB)C
RB)C
Other useful relationships are shown below.
period
tH
tL
0.693 (RA
1.44
2RB) C
2RB) C
frequency
(RA
Output driver duty cycle
tL
tH
tL
RB
RA
2RB
Output waveform duty cycle
tH
tH
tL
tH
RB
RA
RB
Low-to-high ratio
tL
1–
RB
RA
2RB
f
C Capacitance
μ
F
100 k
10 k
1 k
100
10
1
100
10
1
0.1
0.01
0.1
0.001
R
A
+ 2 R
B
= 10 M
R
A
+ 2 R
B
= 1 M
R
A
+ 2 R
B
= 100 k
R
A
+ 2 R
B
= 10 k
R
A
+ 2 R
B
= 1 k
Missing-Pulse Detector
The circuit shown in
Figure 15
can be used to detect a missing pulse or abnormally long spacing between
consecutive pulses in a train of pulses. The timing interval of the monostable circuit is retriggered continuously
by the input pulse train as long as the pulse spacing is less than the timing interval. A longer pulse spacing,
missing pulse, or terminated pulse train permits the timing interval to be completed, thereby generating an
output pulse as shown in
Figure 16
.
Time 0.1 ms/div
V
Figure 16. Completed Timing Waveforms for
Missing-Pulse Detector
V
CC
= 5 V
R
A
= 1 k
C = 0.1
μ
F
See Figure 15
Capacitor Voltage
Output Voltage
Input Voltage
V
CC
(5 V to 15 V)
DISCH
OUT
V
CC
RESET
R
L
R
A
A5T3644
C
THRES
GND
1
CONT
TRIG
Input
0.01
μ
F
Submit Documentation Feedback
Output
4
8
3
7
6
2
5
Pin numbers shown are shown 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 13 shows typical waveforms generated during astable operation. The output high-level duration t
H
and
low-level duration t
L
can be calculated as follows:
Figure 14. Free-Running Frequency
Figure 15. Circuit for Missing-Pulse Detector
11
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