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NE555 Datasheet(PDF) 18 Page - Texas Instruments

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

NE555 Datasheet(HTML) 18 Page - Texas Instruments

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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
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
www.ti.com
Typical Applications (continued)
9.2.4.1 Design Requirements
The sequential timer application chains together multiple mono-stable timers. The joining components are the 33-
k
Ω resistors and 0.001-µF capacitors. The output high to low edge passes a 10-µs start pulse to the next
monostable.
9.2.4.2 Detailed Design Procedure
The timing resistors and capacitors can be chosen using this formula. tw = 1.1 × R × C.
9.2.4.3 Application Curves
Figure 23. Sequential Timer Waveforms
10 Power Supply Recommendations
The devices are designed to operate from an input voltage supply range between 4.5 V and 16 V. (18 V for
SE555). A bypass capacitor is highly recommended from VCC to ground pin; ceramic 0.1 µF capacitor is
sufficient.
18
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Copyright © 1973–2014, Texas Instruments Incorporated
Product Folder Links: NA555 NE555 SA555 SE555


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