DESCRIPTION:

The LS7211/LS7212 are monolithic CMOS integrated circuits for generating digitally programmable delays. The delay is controlled by 8 binary weighted inputs, WB0-WB7, in conjunction with an applied clock or oscillator frequency.

FEATURES:

• 8-bit programmable delay from nanoseconds to days

• 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 32.768KHz watch crystal

• Four operating modes

• Reset input for delay abort

• Low quiescent and operating current

• Direct relay drive

• +4V to +18V operation (VDD-VSS)

• LS7211/LS7212 (DIP), LS7211-S/LS7212-S (SOIC)-See Figure 1