555 timer ics texas instruments ne556d this texas instruments ne5556d dual timer ic has a high output current capability sinking or sourcing 200ma which is ttl compatible it is able to operate in astable or monostable mode the output is fully compatible with cmos ttl and mos it uses a single supply from 45vdc to 16vdc it is pin compatible and functionally interchangeable with the ne556 texas instruments ne556d linear ic dual precision timer soic14