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NE555 Datasheet(PDF) 14 Page - Texas Instruments

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Part No. NE555
Description  xx555 Precision Timers
Download  36 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

NE555 Datasheet(HTML) 14 Page - Texas Instruments

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THRES
GND
C
RA
RL
VCC (5 V to 15 V)
Output
DISCH
OUT
VCC
RESET
TRIG
CONT
Modulation
Input
(see Note A)
Clock
Input
NOTE A: The modulating signal can be direct or capacitively coupled
to CONT. For direct coupling, the effects of modulation source
voltage and impedance on the bias of the timer should be
considered.
4
8
3
7
6
2
5
Pin numbers shown are for the D, JG, P, PS, and PW packages.
1
Time − 0.1 ms/div
VCC = 5 V
RA = 1 kΩ
C = 0.1
µF
See Figure 15
Capacitor Voltage
Output Voltage
Input Voltage
NA555, NE555, SA555, SE555
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
www.ti.com
Typical Applications (continued)
9.2.1.3 Application Curves
Figure 17. Completed Timing Waveforms for Missing-Pulse Detector
9.2.2 Pulse-Width Modulation
The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is
accomplished by applying an external voltage (or current) to CONT. Figure 18 shows a circuit for pulse-width
modulation. A continuous input pulse train triggers the monostable circuit, and a control signal modulates the
threshold voltage. Figure 19 shows the resulting output pulse-width modulation. While a sine-wave modulation
signal is shown, any wave shape could be used.
Figure 18. Circuit for Pulse-Width Modulation
14
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Copyright © 1973–2014, Texas Instruments Incorporated
Product Folder Links: NA555 NE555 SA555 SE555


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