The NE556N is an integrated circuit dual timer, or clock oscillator, manufactured by HGSEMI. It is a two-timer device with 14-pin Dual Inline Package (DIP) case and is RoHS (Restriction of Hazardous Substances) compliant. It is designed to provide two highly stable timers or clock oscillators that can be internally adjusted to operate at precise frequencies.The NE556N also features latch enable circuitry for use in one-shot pulse applications, an adjustable duty-cycle for both timing circuits, and trigger and reset inputs to initiate and terminate timing. The two separate timing circuits operate independently and can generate frequencies up to 2.4MHz, with typically 5% accuracy after temperature and power supply variation. The timers require a +5V power supply for operation and can directly drive the logic level outputs.