DESCRIPTION
The LS7217 is a Programmable Timer IC designed to turn on a relay at night and turn off the relay at dawn or after a select able number of hours. Figure 2 shows a typical application schematic. The circuit is powered from a  step-down  transformer and the output drives low-voltage AC loads such as in candescent light bulbs.

FEATURES:
•  Input interface to Photo Resistor
• Programmable Duration Selection
• Shunt regulator
• 50Hz / 60Hz time base selection
• Relay Driver output
• 6.0V ± 0.75V operating voltage range (VDD- VSS)
• LS7217 (DIP), LS7217-S (SOIC) - See Figure 1 -

APPLICATIONS
Lighting control for low voltage landscape lighting, etc.