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NE555N Timer NE555N
The 555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay monostable mode of operation the time is precisely controlled by one external resistor and one capacitor. For stable operation as an oscillator the free running frequency and the duty cycle are both accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms and the output structure can source or sink up to 200mA or drive TTL directly. This IC may also be correctly supplied marked as MC1455PI. Supply decoupling must be provided close to the IC to counter the crowbar effect of the devices internal discharge switch a suitable value is 10 to
100microF as shown in the accompanying diagrams.Monostable ModeTime Delay vs RltsubgtAltsubgt and COn time after triggering i.e. applying a voltage to pin 2 less than 13 supply voltage is equal to 1.1RAC. The load may be connected to VCC for normally-on operation or between pin 3 and ground for normally- off. Connecting reset to ground during on time drives the output low until a new trigger pulse occurs. Additional trigger pulses during on time have no effect. If reset is not being used connect it to VCC.Astable Mode OscillatorFree Running Frequencyvs RltsubgtAltsubgt RltsubgtBltsubgt and CThe frequency is equal to 1.44RA 2RBC. The charge time output high is given by t1 0.693RA RBC and the discharge time output low is given by t2 0.693RBC.Characteristics typical 4.5V min 16V maxSupply
current3mA VCC 5V 10mAVCC 15VThreshold voltageVCC x 0.667Trigger voltage5V VCC 15V 1.67VVCC 5VTrigger current0.5microAThreshold current0.1microAControl voltage level10V VCC 15V 3.33V
100microF as shown in the accompanying diagrams.Monostable ModeTime Delay vs RltsubgtAltsubgt and COn time after triggering i.e. applying a voltage to pin 2 less than 13 supply voltage is equal to 1.1RAC. The load may be connected to VCC for normally-on operation or between pin 3 and ground for normally- off. Connecting reset to ground during on time drives the output low until a new trigger pulse occurs. Additional trigger pulses during on time have no effect. If reset is not being used connect it to VCC.Astable Mode OscillatorFree Running Frequencyvs RltsubgtAltsubgt RltsubgtBltsubgt and CThe frequency is equal to 1.44RA 2RBC. The charge time output high is given by t1 0.693RA RBC and the discharge time output low is given by t2 0.693RBC.Characteristics typical 4.5V min 16V maxSupply
current3mA VCC 5V 10mAVCC 15VThreshold voltageVCC x 0.667Trigger voltage5V VCC 15V 1.67VVCC 5VTrigger current0.5microAThreshold current0.1microAControl voltage level10V VCC 15V 3.33V
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