The webpage is not working since JavaScript is not enabled. The CONTROL VOLTAGE input can be used to build an astable multivibrator with a frequency modulated output. It is usual to connect a 10 nF capacitor between pin 5 and 0 V to prevent interference. In most applications, the CONTROL VOLTAGE input is not used. By applying a voltage to the CONTROL VOLTAGE input one can alter the timing characteristics of the device. Pin 5 is also sometimes called the CONTROL VOLTAGE pin. Positive supply voltage, which is usually between 3 and 15 V depending on the variation. Open collector output which may discharge a capacitor between intervals. The timing (OUT high) interval ends when the voltage at THR is greater than that at CTRL (2/3 V CC if CTRL is open). Provides 'control' access to the internal voltage divider (by default, 2/3 V CC ). This output is driven to approximately 1.7 V below + V CC or GND.Ī timing interval may be reset by driving this input to GND, but the timing does not begin again until RESET rises above approximately 0.7 volts. The OUT pin goes high and a timing interval starts when this input falls below 1/2 of CTRL voltage (hence TRIG is typically 1/3 V CC, CTRL being 2/3 V CC by default, if CTRL is left open). Ground reference voltage, low level (0 V) The connection of the pins for a DIP package is as follows: Pin Name Purpose This timer IC operates as a one-shot timer or as n astable multivibrator. The 555 timer IC integrated circuit is the first and still one of the most popular IC timer chips in use. 555 IC Timer Monostable and Astable Design Calculatorĥ55 IC Timer Monostable and Astable Design Calculator.

555 timer pinout download