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SA555DG4 Datasheet(PDF) 10 Page - Texas Instruments

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Part # SA555DG4
Description  Precision timing circuits capable of producing accurate time delays or oscillation
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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C − Capacitance −
µF
10
1
10−1
10−2
10−3
10−4
100
10
1
0.1
0.01
10−5
0.001
RA = 10 MΩ
RA = 10 kΩ
RA = 1 kΩ
RA = 100 kΩ
RA = 1 MΩ
Time − 0.1 ms/div
Capacitor Voltage
Output Voltage
Input Voltage
RA = 9.1 kΩ
CL = 0.01 µF
RL = 1 kΩ
See Figure 9
Time − 0.5 ms/div
t
H
Capacitor Voltage
Output Voltage
tL
RA = 5 kW
RL = 1 kW
RB = 3 kW
See Figure 12
C = 0.15
µF
GND
OUT
VCC
CONT
RESET
DISCH
THRES
TRIG
C
RB
RA
Output
RL
0.01
µF
VCC
(5 V to 15 V)
(see Note A)
NOTE A: Decoupling CONT voltage to ground with a capacitor can
improve operation. This should be evaluated for individual
applications.
Open
5
8
4
7
6
2
3
1
Pin numbers shown are for the D, JG, P, PS, and PW packages.
NA555, NE555, SA555, SE555
SLFS022H – SEPTEMBER 1973 – REVISED JUNE 2010
www.ti.com
Figure 10. Typical Monostable Waveforms
Figure 11. Output Pulse Duration vs Capacitance
Astable Operation
As shown in Figure 12, adding a second resistor, RB, to the circuit of Figure 9 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 only. 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
(
≉0.67 × VCC) and the trigger-voltage level (≉0.33 × VCC). As in the monostable circuit, charge and discharge
times (and, therefore, the frequency and duty cycle) are independent of the supply voltage.
Figure 12. Circuit for Astable Operation
Figure 13. Typical Astable Waveforms
10
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Copyright © 1973–2010, Texas Instruments Incorporated
Product Folder Link(s): NA555 NE555 SA555 SE555


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