Microchip Technology HCS500-I/P

The HCS500 receives and validates compatible KEELOQ code-hopping transmissions. It can operate as a stand-alone decoder or communicate with a host microcontroller through a synchronous clock/data interface. The device uses an external EEPROM for protected manufacturer-code, transmitter-key, and synchronization information. The HCS500-I/P order option specifies the industrial -40 to +85 °C grade in an 8-lead plastic DIP.

• KEELOQ code-hopping decoder with normal and secure learning mechanisms.
• Automatic bit-rate detection for the supported encoder transmission format.
• External EEPROM interface for transmitter records and secret information.
• Synchronous serial data and clock interface to a controller.
• Internal oscillator and 3.0 to 5.5 V specified supply range.
• Requires a compatible receiver front end and properly configured encoder keys and formats.

The P ordering code denotes an 8-pin plastic DIP; the catalog identifies a 0.300-inch (7.62 mm) row spacing. The local package registry contains 8-DIP, but the associated JPG is not yet available. Use the current Microchip mechanical drawing for footprint dimensions and pin-1 orientation.

Assembly checks

• Confirm pin-1 marking and socket orientation.
• Check row spacing, lead pitch, and drilled-hole size against the mechanical specification.
• Verify the I temperature marking and purchase order.

The manufacturer's Table 2-1 identifies pin 1 VDD, pin 2 EE_CLK, pin 3 EE_DAT, pin 4 MCLR, pin 5 S_DAT, pin 6 S_CLK, pin 7 RFIN, and pin 8 GND/VSS. EE_CLK and EE_DAT connect to the external EEPROM; S_DAT and S_CLK communicate with a controller; RFIN receives decoded RF-front-end data. Design reset and interface levels to the data-sheet requirements.

Operating limits, timing, and logic thresholds depend on the data-sheet test conditions; absolute maximum ratings are not operating specifications.

HCS500-C/P uses the same P package family but a different 0 to +70 °C ordering grade. HCS500-I/SM uses an SOIJ footprint rather than the PDIP footprint. Neither option should be treated as a drop-in substitute without verifying temperature qualification, pinout, memory programming, key handling, receiver timing, and supply/interface limits. No unverified internal alternative link is included.

Microchip data sheet DS40000153E defines the HCS500 feature set, pin assignment, operating range, electrical characteristics, packaging, and ordering suffixes. The product page identifies the HCS500 family as in production. Review the latest manufacturer documents and device change notices for controlled design decisions.

Confirm the full HCS500-I/P marking, manufacturer traceability, PDIP geometry, and programmed manufacturer-code relationship. Secure the cryptographic provisioning flow and test valid, replayed, and out-of-window transmissions in the complete receiver design.

Before publication, supply and inspect the registered 8-DIP JPG and verify the rendered page. Before use, validate the latest Microchip data sheet, secure key provisioning, external EEPROM interface, compatible encoder format, environmental limits, and full-system security behavior.