HCS361/P

Specialized ICS Overview

The HCS361/P is a KEELOQ® code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. It generates a 67-bit transmission stream combining a 32-bit encrypted hopping code with a 28/32-bit serial number and status bits. The device operates on a 2.0V to 6.6V supply and features four button inputs supporting up to 15 functions. Internal EEPROM stores a programmable 64-bit encryption key, serial number, and synchronization data, all protected against external reading. It supports PWM and VPWM modulation formats.

Specialized ICS Feature Summary

• Generates unique 67-bit transmissions using KEELOQ® encryption to prevent code grabbing
• Features read-protected EEPROM storing a 64-bit crypt key and 28/32-bit serial number
• Supports selectable baud rates of 833 or 1667 bps via configuration bits
• Includes automatic code word completion and battery low signal transmission

Specialized ICS Applications

• Automotive remote keyless entry systems
• Gate and garage door openers
• Burglar alarm systems
• Identity tokens

Specialized ICS Procurement Notes

Verify the 'P' suffix confirms the PDIP-8 package type. Confirm programming requirements for the internal EEPROM, as keys are programmed during production. Ensure the application voltage falls within the 2.0V to 6.6V operating range. Check for compatibility with the intended decoder's learning mode.

Specialized ICS Selection Notes

Select this component for unidirectional security applications requiring high resistance to code scanning. Choose between 28-bit or 32-bit serial numbers based on system capacity needs. Consider modulation options (PWM vs. VPWM) depending on RF or IR transmitter circuitry. Verify that the decoder supports the specific baud rate and seed transmission methods configured in the encoder.

Specialized ICS Part Context

The HCS361 is part of Microchip's KEELOQ® family of code hopping devices. It serves as the transmitter counterpart to decoders like the HCS515. Compared to earlier models such as the HCS300, it offers enhanced features including a 48-bit seed, independent counter modes, and infrared modulation capabilities.

Specialized ICS Replacement Considerations

Direct replacements must support KEELOQ® technology and compatible pinouts. The HCS300 is a predecessor but lacks some enhanced features. Ensure any substitute matches the required package (PDIP-8) and voltage specifications.