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NE555 Datasheet(PDF) 12 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) 12 Page - Texas Instruments

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Time − 0.1 ms/div
Capacitor Voltage
Output Voltage
Input Voltage
VCC = 5 V
RA = 1250 Ω
C = 0.02
µF
See Figure 9
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
NA555, NE555, SA555, SE555
SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014
www.ti.com
Feature Description (continued)
Figure 14. Free-Running Frequency
8.3.3 Frequency Divider
By adjusting the length of the timing cycle, the basic circuit of Figure 9 can be made to operate as a frequency
divider. Figure 15 shows a divide-by-three circuit that makes use of the fact that re-triggering cannot occur during
the timing cycle.
Figure 15. Divide-by-Three Circuit Waveforms
8.4 Device Functional Modes
Table 1. Function Table
RESET
TRIGGER VOLTAGE(1)
THRESHOLD VOLTAGE(1)
OUTPUT
DISCHARGE SWITCH
Low
Irrelevant
Irrelevant
Low
On
High
<1/3 VCC
Irrelevant
High
Off
High
>1/3 VCC
>2/3 VCC
Low
On
High
>1/3 VCC
<2/3 VCC
As previously established
(1)
Voltage levels shown are nominal.
12
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Copyright © 1973–2014, Texas Instruments Incorporated
Product Folder Links: NA555 NE555 SA555 SE555


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