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NE555 Datasheet(PDF) 17 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) 17 Page - Texas Instruments

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background image
S
VCC
RESET
VCC
OUT
DISCH
GND
CONT
TRIG
4
8
3
7
6
1
5
2
THRES
RC
CC
0.01
CC = 14.7 µF
RC = 100 kΩ
Output C
RESET
VCC
OUT
DISCH
GND
CONT
TRIG
4
8
3
7
6
1
5
2
THRES
RB
33 k
0.001
0.01
µF
CB = 4.7 µF
RB = 100 kΩ
Output B
Output A
RA = 100 kΩ
CA = 10 µF
µF
0.01
µF
0.001
33 k
RA
THRES
2
5
1
6
7
3
8
4
TRIG
CONT
GND
DISCH
OUT
VCC
RESET
µF
µF
CB
CA
Pin numbers shown are for the D, JG, P, PS, and PW packages.
NOTE A: S closes momentarily at t = 0.
RA = 3 kΩ
RB = 500 Ω
RL = 1 kΩ
See Figure 20
Capacitor Voltage
Output Voltage
Modulation Input Voltage
Time − 0.1 ms/div
NA555, NE555, SA555, SE555
www.ti.com
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
Typical Applications (continued)
9.2.3.3 Application Curves
Figure 21. Pulse-Position-Modulation Waveforms
9.2.4 Sequential Timer
Many applications, such as computers, require signals for initializing conditions during start-up. Other
applications, such as test equipment, require activation of test signals in sequence. These timing circuits can be
connected to provide such sequential control. The timers can be used in various combinations of astable or
monostable circuit connections, with or without modulation, for extremely flexible waveform control. Figure 22
shows a sequencer circuit with possible applications in many systems, and Figure 23 shows the output
waveforms.
Figure 22. Sequential Timer Circuit
Copyright © 1973–2014, Texas Instruments Incorporated
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Product Folder Links: NA555 NE555 SA555 SE555


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