🔐 LS7220 - Standalone Digital Lock IC with Keypad Interface 🔐
The LS7220 is a dedicated digital lock IC designed for use with 10-key numeric keypads. It allows users to input a 1 to 7-digit passcode to control an output signal for access control, alarms, or electronic locking systems. No microcontroller is required, making it ideal for simple, reliable security applications.
✅ Technical Specifications:
- Code Length: 1 to 7 digits
- Keypad Input: 0–9 numeric keys
- Output: Activated on correct code entry
- Programmability: Reprogrammable passcode
- Operating Voltage: 4.75V to 5.25V (TTL logic)
- Power Consumption: Low
- Operating Temperature: 0°C to 70°C
- Package: DIP-16
🔹 Features:
- Fully standalone digital lock circuit
- User-definable passcode with reset function
- Logic-level output to control relay or other circuit
- Clear key for code re-entry
- Great for simple and secure access control systems
📌 Common Applications:
- Digital door locks and lockers
- Keypad-based access control systems
- Alarm panel code entry
- DIY security projects
- Low-cost electronic locking systems
🔹 Approximate Weight: 10 grams
