HCS201T/SN

Specialized ICS Overview

The HCS201T/SN is a code hopping encoder from Microchip Technology, part of the KEELOQ® series. It utilizes a nonlinear encryption algorithm to generate unique 66-bit transmission codes, combining a 32-bit hopping code with a 28-bit serial number and status bits. Operating within a voltage range of 3.5V to 13V (or 2.0V minimum with the step-up feature), it features three button inputs supporting seven functions. The device includes an on-chip EEPROM for storing encryption keys and synchronization data, ensuring high security against code scanning and replay attacks in remote keyless entry systems.

Specialized ICS Feature Summary

• KEELOQ® Code Hopping: Generates unique 66-bit codes using a 32-bit hopping algorithm and 28-bit serial number to prevent code capture and replay.
• Secure Memory: Contains read-protected 64-bit encryption keys and non-volatile synchronization data stored in on-chip EEPROM.
• Flexible Power Options: Operates on 3.5V–13V; supports a built-in step-up regulator allowing operation down to 2.0V input.
• Programmable Interface: Features a simple serial programming interface for loading keys, serial numbers, and configuration parameters.

Specialized ICS Applications

• Automotive Remote Keyless Entry (RKE) systems
• Automotive alarm and immobilizer systems
• Gate and garage door openers
• Identity tokens and access control systems

Specialized ICS Procurement Notes

Verify the ordering suffix 'T' corresponds to the Tape & Reel packaging format as specified in local product fields. Confirm that the specific revision level matches the required datasheet version DS41098D. Ensure compatibility with existing decoder firmware regarding baud rate and code word structure before finalizing procurement quantities.

Specialized ICS Selection Notes

Select the HCS201T/SN when surface-mount assembly is required for KEELOQ® based security applications. Choose this variant over PDIP versions if PCB space is limited. Consider the step-up regulator feature if the application requires operation from low-voltage batteries (down to 2.0V). Verify that the system design accommodates the necessary external components for the RF transmitter stage.

Specialized ICS Part Context

The HCS201T/SN belongs to the HCS201 family of code hopping encoders manufactured by Microchip Technology. The 'SN' suffix indicates an 8-SOIC package, while the 'T' suffix denotes tape and reel packaging. This component is designed to work in conjunction with compatible decoders, such as the HCS200 or HCS300 series, to form secure unidirectional communication links.

Specialized ICS Replacement Considerations

Direct replacements must maintain KEELOQ® compatibility and similar pinout configurations. Check datasheets for equivalent packages like HCS201/SN (SOIC) or HCS201/P (PDIP) if lead-free or different packaging is needed. Ensure any substitute supports the same 66-bit code word structure and EEPROM programming requirements.