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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-collector outputs; each output can sink up to 100 mA.
XR-559 Datasheet
