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Project Report - D EVICE MODELL I NG SPICE NETLIST IC 555...

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DEVICE MODELLING SPICE NETLIST - IC 555 IN ASTABLE MODE SUBMITTED BY: VISHAKH LAKSHMINARAYAN BT07ECE059 (N4) INTRODUCTION
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IC 555 is a timer IC. It is the most versatile of the timers that are present. IC 555 can be used in two modes: 1. Monstable mode 2. Astable multivibrator ASTABLE MULTIVIBRATOR: An astable multivibrator, often called a free running multivibrator, is a rectangular-wave-generating circuit. Unlike the monostable multivibrator, this circuit does not require an external trigger to change the state of the output, hence the name free running. The time during which the output is either high or low is determined by two resistors and a capacitor, which are externally connected to the 555 timer.
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OPERATION: Initially when the output is high, capacitor C starts charging towards Vcc through Ra and Rb. However, as soon as the voltage across the capacitor equals 2/3 Vcc, comparator 1 triggers the flip-flop and the output switches low. Now capacitor starts discharging through Rb and transistor Q1. When the voltage across C equals 1/3 Vcc, the comparator 2’s
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Project Report - D EVICE MODELL I NG SPICE NETLIST IC 555...

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