XR-558

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. The XR-559 is designed with emitter-follower outputs. Each output can source up to 100 mA of load current. The outputs are normally at "low" state, and go to "high" state during the timing interval. FEATURES Four Independent Timer Sections High C...