LSI Computer Systems LS7223
The LS7223 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 electromechanical locks. The Secondary code, when entered from the keypad, causes the Lock 2 output to toggle.| Part No. | LS7223 |
|---|---|
| Datasheet | LS7223 Download |
| Manufacturer |  LSI Computer Systems |
| Description | KEYPAD PROGRAMMABLE DIGITAL LOCK |
| Buy | Stock & Price |
FEATURES
:● Stand alone lock logic
● 38416, 4-digit combinations
● 3 different user programmable codes
● Momentary and static lock control outputs
● Internal key debounce circuit
● Tamper detection output
● Status outputs
● Low current consumption
● +4V to +15V operation (VDD -VSS)
● LS7223 (DIP), LS7223-S (SOIC) - See Figure 1
GENERAL DESCRIPTION
: Input is provided by a matrix keypad whose maximum allowable size is 4 x 4. CONNECTION DIAGRAM - TOP VIEW V SS (-V) RC-OSC X1 X2 X3 X4 Y1 Y2 Y3 Y4 1 2 3 4 20 V DD (+V) 19 CAP-K 18 LOCK DISPLAY 17 LOCK 1 LSI LS7223 5 6 7 8 9 10 16 LOCK 2 15 ALARM 14 MOM 13 12 TAMPER CAP-M 11 PROGRAM FIGURE 1 The LS7223 can be programmed to recognize 3 different codes: one to toggle an output and generate a pulse (Primary), one to toggle an output (Secondary), and one to toggle an output and trigger an alarm (Duress). Programming 2. The first 3 is done via the keypad inputs. Any entry from the keypad digits of the Secondary code must be identical to the (when...
