NE556 Timer

The NE556 dual monolithic timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. In the time delay mode of op-eration, the time is precisely controlled by one exter-nal resistor and capacitor.

For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two exter-nal 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.

Features

• Low turn off time.

• Maximum operating frequency greater than 500kHz.

• Timing from microseconds to hours.

• Operates in both astable and monostable modes.

• High output current can source or sink 200mA.

• Adjustable duty cycle.

• TTL compatible.

• Temperature stability of 0.005% per  ^oc.