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NE555 Datasheet(PDF) 8 Page - Diodes Incorporated

Part # NE555
Description  PRECISION TIMERS
Download  14 Pages
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

NE555 Datasheet(HTML) 8 Page - Diodes Incorporated

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NE555/SA555/NA555
PRECISION TIMERS
NE555/SA555/NA555
Document number: DS35112 Rev. 4 - 2
8 of 14
www.diodes.com
February 2012
© Diodes Incorporated
Typical Applications Characteristics (cont.)
Astable Operation
As shown in Figure 4, adding a second resistor, RB, to the circuit of Figure 1 and connecting the trigger input to the threshold
input causes the timer to self-trigger and run as a multivibrator. The capacitor C charges through RA and RB and then
discharges through RB. Therefore, the duty cycle is controlled by the values of RA and RB.
This astable connection results in capacitor C charging and discharging between the threshold-voltage level (
≉0.67VCC) and
the trigger-voltage level (
≉0.33VCC). As in the monostable circuit, charge and discharge times (and, therefore, the frequency
and duty cycle) are independent of the supply voltage.
 
C
RL
RA
RB
THRES
TRIG
DISCH
RESET
CONT
VCC
GND
OUT
Output
4
7
6
2
1
3
8
5
Open
(See Note A)
VCC
(5V to 15V)
Decoupling CONT voltage to ground with a capacitor can
improve operation. This should be evaluated for individual
applications.
0.01µF
Fig. 4 Circuit for Astable Operation
Fig. 5 Typical Astable Waveforms
Figure 5 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level
duration tL can be calculated as follows:
tH = 0.693(RA +RB)C
tL = 0.693(RB)C
Other useful equations are:
period = tH + tL = 0.693(RA + 2RB)C
frequency = 1.44/(RA + 2RB)C
output driver duty cycle = tL/(tH + tL) = RB/(RA + 2RB)
output waveform duty cycle = tH/(tH + tL) = 1 – RB/(RA + 2RB)
low to high ratio = tL/tH = RB/(RA + RB)
Fig. 6 Free Running Frequency


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