• Ultimate KeeLoq Features
• ■  Timer driven messages
• ■  Time stamped events
• ■  Industry standard AES-128 encryption
• ■  Secure learn mode for pairing
• ■  Time recovery after power loss
• Operating Features
• ■  Operating voltage 1.8–3.6V
• ■  Operating temperature −40°C to 85°C: industrial
• ■  20-pin TSSOP package
• ■  1.8–3.6V operation
• ■  Four switch inputs
• ■  15 functions available
• ■  Configurable button modes
• ■  One active-low LED drive
• ■  Configurable minimum code word completion
• RF Transmitter Features
• ■  Fully integrated transmitter
• ■  Operation in 310–928 MHz
• ■  Configurable bit rate
• ■  Configurable modulation, supporting OOK and FSK
• ■  Configurable data modulation,  supporting PWM and Manchester

The new  MCS3142 Dual KeeLoq  Encoder provides a complete turnkey solution utilizing the Ultimate KeeLoq  Protocol,  a new timer-based solution offering enhancements to the Classic KeeLoq  Protocol structure such as industry-standard AES-128 block cipher, programmable 32-bit serial number, programmable 128-bit encryption key and KeeLoq  Secure Learn Mode (128-bit Seed). It incorporates a timer-driven message counter which continuously increments, independent of events, to provide a better, more secure solution. The time-keeping functionality provides additional protection against capture and replay attack techniques.

The addition of our new Ultimate KeeLoq  Protocol provides the customer the ability to develop highly secure authentication applications for a variety of markets such as security systems (keypads, remote sensors and access control), remote keyless entry (automotive) and authentication (identity and property) applications.