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5962-8950302CA Datasheet(PDF) 10 Page - Texas Instruments |
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5962-8950302CA Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page TLC556, TLC556Y DUAL LinCMOS ™ TIMERS SLFS047B – FEBRUARY 1984 – REVISED SEPTEMBER 1997 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION 0.1 µF 0.1 µF CT CL RL Output RB RA GND TRIG THRES RESET DISCH CONT VDD OUT VDD 2/3 VDD 1/3 VDD GND tPHL tPLH tH tL CIRCUIT TRIGGER AND THRESHOLD VOLTAGE WAVEFORM TLC556 Figure 3. Astable Operation Connecting the trigger input to the threshold input, as shown in Figure 3, causes the timer to run as a multivibrator. The capacitor CT charges through RA and RB to the threshold voltage level (approximately 0.67 VDD) and then discharges through RB only to the value of the trigger voltage level (approximately 0.33 VDD). The output is high during the charging cycle (tH) and low during the discharge cycle (tL). The duty cycle is controlled by the values of RA, and RB, and CT, as shown in the equations below. tH [ CT (RA ) RB) In 2 (In 2 + 0.693) tL [ CT RB In 2 Period + t H ) tL [ CT (RA ) 2RB)In 2 Output driver duty cycle + tL tH ) tL [ 1 * RB R A ) 2RB Output waveform duty cycle + tH tH ) tL [ RB R A ) 2RB The 0.1- µF capacitor at CONT in Figure 3 decreases the period by about 10%. The formulas shown above do not allow for any propagation delay from the trigger and threshold inputs to the discharge output. These delay times add directly to the period and create differences between calculated and actual values that increase with frequency. In addition, the discharge output resistance ron adds to RB to provide another source of error in the calculation when RB is very low or ron is very high. The equations below provide better agreement with measured values. tH + CT (RA ) RB)In 3 * exp * t PLH CT (RB ) ron) ) t PHL tL + CT (RB ) ron)In 3 * exp * t PHL CT (RA ) RB) ) t PLH |
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