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NE555DR Datasheet(PDF) 11 Page - Texas Instruments

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Part No. NE555DR
Description  PRCISION TIMERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

NE555DR Datasheet(HTML) 11 Page - Texas Instruments

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t
H +
0.693 (R
A )
R
B)
C
t
L +
0.693 (R
B)
C
Other useful relationships are shown below.
period + tH ) tL + 0.693 (RA ) 2RB) C
frequency [
1.44
(R
A )
2R
B
) C
Output driver duty cycle +
t
L
t
H )
t
L
+
R
B
R
A )
2R
B
Output waveform duty cycle
+
t
L
t
H
+
R
B
R
A )
R
B
Low-to-high ratio
+
t
H
t
H )
t
L
+ 1–
R
B
R
A )
2R
B
C − Capacitance −
µF
100 k
10 k
1 k
100
10
1
100
10
1
0.1
0.01
0.1
0.001
RA + 2 RB = 10 MΩ
RA + 2 RB = 1 MΩ
RA + 2 RB = 100 kΩ
RA + 2 RB = 10 kΩ
RA + 2 RB = 1 kΩ
Time − 0.1 ms/div
VCC = 5 V
RA = 1 kΩ
C = 0.1
µF
See Figure 15
Capacitor Voltage
Output Voltage
Input Voltage
VCC (5 V to 15 V)
DISCH
OUT
VCC
RESET
RL
RA
A5T3644
C
THRES
GND
CONT
TRIG
Input
0.01
µF
Output
4
8
3
7
6
2
5
1
Pin numbers shown are shown for the D, JG, P, PS, and PW packages.
NA555, NE555, SA555, SE555
www.ti.com
SLFS022H – SEPTEMBER 1973 – REVISED JUNE 2010
Figure 12 shows typical waveforms generated during astable operation. The output high-level duration tH and
low-level duration tL can be calculated as follows:
Figure .
Figure 14. Free-Running Frequency
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.
Figure 15. Circuit for Missing-Pulse Detector
Figure 16. Completed Timing Waveforms for
Missing-Pulse Detector
Copyright © 1973–2010, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Link(s): NA555 NE555 SA555 SE555


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