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NE555D Datasheet(PDF) 15 Page - Texas Instruments

Part No. NE555D
Description  PRECISION TIMERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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Sequential Timer
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.
t − Time − 1 s/div
See Figure 22
Output A
Output B
Output C
t = 0
twC = 1.1 RCCC
twC
twB = 1.1 RBCB
twA = 1.1 RACA
twA
twB
NA555, NE555, SA555, SE555
PRECISION TIMERS
SLFS022G – SEPTEMBER 1973 – REVISED MARCH 2008
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
Figure 23. Sequential Timer Waveforms
Copyright © 1973–2008, Texas Instruments Incorporated
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15
Product Folder Link(s): NA555 NE555 SA555 SE555




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