آی سی KA558 دارای 4 تایمر می باشد که میتواند 4 محدوده زمانی تولید کند.

The KA558/KA558B series are monolithic Quad Timers which can be used to produce four entirely independent tim ing functions. These highly stable, general purpose con trollers can be used in a monostable mode to produce accurate time delays, from microseconds to hours. The time is precisely controlled by one external resistor and one capacitor in the time delay mode. A stable mode can be oper ated using two of four time sections.