XR-558/559
Quad Timing Circuits
GENERAL DESCRIPTION
The XR-558 and the XR-559 quad timing circuits contain four independent timer sections on a single monolithic chip.
Each of the timer sections on the chip are entirely independent, and each one can produce a time delay from microseconds to minutes, as set by an external R-C network.
Each timer has its separate trigger terminal, but all four timers in the IC package share a common reset control.
Both the XR-558 and the XR-559 quad timer circuits are "edge-triggered" devices, so that each timer section can be cascaded, or connected in tandem, with other timer sections, without requiring coupling
capacitors.
The XR-558 is designed with open-c...