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