The NE555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For a 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.
The NE555, SA555 and SE555 are versatile timing ICs that can operate in astable or monostable modes. They feature low turn‑off time, a maximum operating frequency over 500 kHz, adjustable duty cycle, TTL compatibility, and can source or sink up to 200 mA.
The document lists absolute maximum ratings, electrical characteristics, application notes, package details and ordering codes for each variant. It also includes revision history and legal notices from STMicroelectronics.
| Supply voltage (NE555) | 4.5 V to 16 V |
|---|---|
| Supply voltage (SA555) | 4.5 V to 16 V |
| Supply voltage (SE555) | 4.5 V to 18 V |
| Temperature stability | 0.005 % per °C |
| Maximum output current | 200 mA source or sink |
The NE555 operates from 4.5 V to 16 V.
It can source or sink up to 200 mA.
The device has a temperature stability of 0.005 % per °C.