SA555DRE4 datasheet(10/30 Pages) TI1

Part #	SA555DRE4

Description	Precision timing circuits capable of producing accurate time delays or oscillation

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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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Product Folder Link(s): NA555 NE555 SA555 SE555

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