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NE555 Datasheet(PDF) 9 Page - Texas Instruments |
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NE555 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 24 page  www.ti.com APPLICATION INFORMATION Monostable Operation VCC (5 V to 15 V) RA RL Output GND OUT VCC CONT RESET DISCH THRES TRIG Input 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 For monostable operation, any of these timers can be connected as shown in Figure 9. If the output is low, application of a negative-going pulse to the trigger (TRIG) sets the flip-flop (Q goes low), drives the output high, and turns off Q1. Capacitor C then is charged through RA until the voltage across the capacitor reaches the threshold voltage of the threshold (THRES) input. If TRIG has returned to a high level, the output of the threshold comparator resets the flip-flop (Q goes high), drives the output low, and discharges C through Q1. Figure 9. Circuit for Monostable Operation Monostable operation is initiated when TRIG voltage falls below the trigger threshold. Once initiated, the sequence ends only if TRIG is high at the end of the timing interval. Because of the threshold level and saturation voltage of Q1, the output pulse duration is approximately tw = 1.1RAC. Figure 11 is a plot of the time constant for various values of RA and C. The threshold levels and charge rates both are directly proportional to the supply voltage, VCC. The timing interval is, therefore, independent of the supply voltage, so long as the supply voltage is constant during the time interval. Applying a negative-going trigger pulse simultaneously to RESET and TRIG during the timing interval discharges C and reinitiates the cycle, commencing on the positive edge of the reset pulse. The output is held low as long as the reset pulse is low. To prevent false triggering, when RESET is not used, it should be connected to VCC. 9 Submit Documentation Feedback |
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