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NE555 Datasheet(PDF) 10 Page - Texas Instruments |
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NE555 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 24 page  www.ti.com 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 Astable Operation 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 PRECISION TIMERS SLFS022F – SEPTEMBER 1973 – REVISED JUNE 2006 APPLICATION INFORMATION (continued) Figure 10. Typical Monostable Waveforms Figure 11. Output Pulse Duration vs Capacitance 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 × V CC) 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 Submit Documentation Feedback |
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