IC 555 and IC 556

All the persons who is professional or hobbyist with electronics are well acquainted with IC 555. It is one of the most useful ICs ever made.
IC 555 is popularly know as timer IC and 556 is popularly know as dual timer IC.
IC 555 comes with 8 pins its recommended power supply is 4.5V to 15V and 18V is maximum amount that can be supplied. IC 556 comes with 14 pin package, the power supply specification is same as 555.

The main difference between 556 and 555 is 556 is dual timer which shares the same power supply, just like there is 2 555 ICs inside 556 IC sharing same pin for power supply
The various outputs of IC 555 and IC 556 are:

1. Astable producing a square wave
2. Monostable producing a single pulse when triggered
3. Bistable a simple memory which can be set and reset
4. Buffer an inverting buffer (Schmitt trigger)