LS7220

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 (V_ss - V_DD)
·LS7220 (DIP), LS7220-S (SOIC) - See Figure 1


Pinout




Specifications

PARAMETER	SYMBOL	VALUE	UNIT
DC Supply Voltage	VSS - VDD	+20	V
Any Input Voltage	VIN	VSS - 20 to VSS + 0.5	V
Operating Temperature	TA	-25 to +85
Storage Temperature	TSTG	-65 to +150

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.

The LS7220 is configured with the features required for an Auto- motive  Ignition  Anti-Theft  Digital  Lock  (See  Figure  5).    These features include Sense input which enables the IC, Save Memory for Valet Parking, Convenience Delay to maintain Unlock condition for short term interruptions of the Sense input and Save Status and Lock Status outputs which can be used for  direct drive of LED indicators.