DESCRIPTION

· The LS7215 and LS7216 are CMOS integrated circuits designed for generating digitally programmable delays.

· Delay is controlled by 8 binary-weighted inputs (WB0 - WB7) and an applied clock or oscillator frequency.

· The delay manifests in the Delay Output (OUT) based on the Operating Mode selected by Mode Select inputs A and B: One-Shot, Delayed Operate, Delayed Release, or Dual Delay.

· The time delay is initiated by a transition at the Trigger Input (TRIG).

FEATURES

· Programmable delay ranging from microseconds to days.

· Delay controlled by 8 binary-weighted delay inputs, latched from a shared 8-bit bus.

· On-chip oscillator (RC or Crystal) or external clock time base.

· Selectable prescaler for real-time delay generation based on 50Hz/60Hz time base or 32,768Hz watch crystal.

· Four operating modes: One-Shot, Delayed Operate, Delayed Release, Dual Delay.

· Reset input for delay abort.

· Low quiescent and operating current.

· Direct relay drive capability.

· Operates from +3V to +18V (VDD - VSS).

· Available in DIP (LS7215, LS7216) and SOIC (LS7215-S, LS7216-S) packages.

APPLICATIONS

· Timing control in industrial automation.

· Precision delay generation in electronic circuits.

· Relay and switch timing in control systems.

· Real-time delay applications using 50Hz/60Hz or 32,768Hz time bases.

· Low-power timing solutions for battery-operated devices.