LS7212

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


Pinout




Specifications

	SYMBOL	VALUE	UNIT
DC Supply Voltage	VDD	+19	V
Voltage (Any Pin)	VIN	VSS -.3 to VDD +.3	V
Operating temperature	TA	-20 to +85
Storage temperature	TSTG	-65 to +150

Description

The LS7211/LS7212 are monolithic CMOS integrated circuits
for generating digitally programmable delays. The delay of LS7212
is controlled by 8 binary weighted inputs, WB0-WB7, in
conjunction with an applied clock or oscillator frequency.
The programmed time delay manifests itself in the Delay
Output (OUT) as a function of the Operating Mode selected
by the Mode Select inputs A and B: One-Shot, Delayed
Operate, Delayed Release or Dual Delay. The time delay is
initiated by a transition of the Trigger Input (TRIG).