LSI/CSI LS7220 U® L LSI Computer Systems, Inc.
1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405 A3800 DIGITAL LOCK FOR AUTOMOTIVE IGNITIONS January 2003 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 DESCRIPTION: The LS7220 is a MOS digital lock circuit.
When wired to a ten-digit keypad, the circuit will recognize one f...

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