LS7222

Features:

• Stand alone lock logic
• 38416, 4-digit combinations
• 3 different user programmable codes
• Momentary and static lock control outputs
• Internal key debounce circuitry
• Tamper detection output
• Status outputs
• Low current consumption
• +4V to +15V operation (VDD -Vss)
• LS7222 (DIP), LS7222-S (SOIC)- See Figure 1


Pinout




Specifications

RATING	SYMBOL	VALUE	UNIT
DC Supply Voltage	VDD	+4 to +18	V
Operating temperature	TA	-25 to +70
Storage temperature	TSTG	-65 to +150

Description

·The LS7222 is a programmable electronic lock implemented in a monolithic CMOS integrated circuit. The circuit contains all the necessary memory, decoder and control logic to make a programmable "keyless" lock system to control electro-mechanical locks. Input is provided by a matrix keypad whose maximum allowable size is 4 x 4.

·The LS7222 can be programmed to recognize 3 different codes: one to lock (Arm), one to unlock (Disarm), and one to unlock and trigger an alarm (Duress). Programming is done via the keypad inputs. Any entry from the keypad (when not in the program mode) which does not match one of the 3 programmed codes causes the Tamper output to become active.

·The monolithic, low power CMOS design of the LS7222 enables it to be designed into typical battery backed-up and automotive type security systems.