DESCRIPTION:
The LS7220 is a MOS digital lock circuit. When wired to a ten-digit keypad, the circuit will recognize one four-digit combination out of a possible 5040 combinations.

FEATURES:
• 5040 Four-Digit Combinations (for a 10 digit Keypad)
• Combinations are Hard-Wire Programmed
• Sense Input Enables Operation
• Save Memory Feature for Valet Parking
• Convenience Delay Controlled by External Capacitor
• Static or Momentary Lock Control Output
• Save Memory and Lock Status Outputs
• +5V to +18V Operation (Vss - VDD)
• LS7220 (DIP), LS7220-S (SOIC) - See Figure 1