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NE555P Datasheet(PDF) 11 Page - Texas Instruments |
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NE555P Datasheet(HTML) 11 Page - Texas Instruments |
11 / 36 page L B H A B t R Low-to-high ratio t R R = = + H B H L A B t R Output waveform duty cycle 1 t t R 2R = = - + + L B H L A B t R Output driver duty cycle t t R 2R = = + + ( ) A B 1.44 frequency R 2R C » + ( ) H L A B period t t 0.693 R 2R C = + = + ( ) L B t 0.693 R C = ( ) H A B t 0.693 R R C = + 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. 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 NA555, NE555, SA555, SE555 www.ti.com SLFS022I – SEPTEMBER 1973 – REVISED SEPTEMBER 2014 Feature Description (continued) 8.3.2 A-stable 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 multi-vibrator. 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 mono-stable 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 Figure 12 shows typical waveforms generated during astable operation. The output high-level duration tH and low-level duration tL can be calculated as follows: (1) (2) Other useful relationships are shown below: (3) (4) (5) (6) (7) Copyright © 1973–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: NA555 NE555 SA555 SE555 |
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