Automotive Ignition Digital Lock
(14 Pins)

LS7220-S, LS7220

Category: Programmable Digital Locks

Status: No longer in production

Stock Availability: DIP

All of our Standard Products are RoHS Compliant

For pricing and availability you may contact us, or request a quote. Most of our standard parts are available for purchase on Digi-Key, and through our Distributors.

Features:

• 5,040 four digit Combinations (for a 10 number keypad)
• Combinations are hard-wire programmed
• SENSE input enables chip operation
• Save Memory feature saves Unlock Condition for Valet Parking
• SAVE input sets Save Memory and LOCK input resets SAVE Memory
• Save Memory and Lock Status outputs
• Convenience Delay determined by external capacitor
• Static or Momentary Lock Control output

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 automotive ignition anti-theft digital lock. These features include SENSE input which enables the IC, Save Memory for valet parking, Convenience Delay to maintain the unlock condition for short term interruptions of the SENSE input and the SAVE STATUS and LOCK STATUS outputs which can be used for direct drive of LED indicators.

When the SENSE input goes high, the LS7220 is enabled. The LOCK STATUS output turns on and the SAVE STATUS and LOCK outputs remain off. When the programmed four-digit combination is entered from the keypad, in proper sequence, LOCK turns on and LOCK STATUS turns off. If the SENSE input is interrupted for a period of time less than the Convenience Delay, the operation of the LS7220 is unaffected. A momentary high at the SAVE input sets the Save Memory and causes the LS7220 to save an unlock condition (Sequential Memory is set) for any time duration interruption of the SENSE input (i.e., valet parking). The SAVE STATUS output turns on when the Save Memory is set. The LOCK input is used to reset the Save Memory and return the LS7220 to normal operation.

Ordering Info

Code
Package
Notes

P/N

RoHS Compliant Standard plastic DIP

1, 2, 3

P/N – S

RoHS Compliant Standard SOIC

1, 2, 3, 4

P/N – SW

RoHS Compliant Widebody SOIC option

1, 2, 3, 4

P/N – S14

RoHS Compliant 14-pin SOIC version of 8-pin part

1, 2, 3, 4

P/N – TS

RoHS Compliant TSSOP

1, 2, 3, 4

P/N – TS24

RoHS Compliant 24-pin TSSOP version of 20-pin part

1, 2, 3, 4

Example: LSxxxx-TS = the LSxxxx in the RoHS Compliant TSSOP package-type

Note 1: See Table for package body widths

Note 2: Package outline drawings conform to JEDEC standards

Note 3: Packages shipped in anti-static tubes

Note 4: Tape and Reel option available. Contact factory for details

ADDITIONAL ORDERING OPTIONS:

Probed Wafers (P/N-PW), Waffle Packed Die (P/N-WP)

Package Body Widths
# of Pins
P/N, -C, -CM
-S
-SW
-TS

8

300

150

14

300

150

173

16

300

150

300

18

300

300

20

300

300

173

24

600

300

173

28

600

300

173

38

173

40

600

44

240

LSI/CSI