Microchip Technology HCS360-I/SN

When a button is pressed, the HCS360 combines a 32-bit encrypted hopping portion with 35 fixed and status bits in a 67-bit transmitted word. An EEPROM stores the cryptographic key, serial number, synchronization counters, seed, and configuration. The DATA output interfaces to external transmission circuitry; an RF transmitter and receiver are not integrated.

LCDChip registers 8-SOIC (0.154", 3.90mm Width). Microchip's product-identification table maps /SN to an eight-lead, 150-mil plastic SOIC and the -I suffix to -40°C through +85°C. Do not substitute the through-hole /P footprint without a board redesign.

Layout checks

• Verify land pattern and lead pitch from the controlled drawing.
• Use the top-view pin-one mark when orienting the package.
• Keep button, DATA, and LED traces consistent with the reference circuit.

The local 8-SOIC JPG exists, but its production URL currently returns HTTP 404. This draft must remain unpublished until the asset is restored and checked.

Microchip's eight-pin top view assigns S0 to pin 1, S1 to pin 2, S2/programming clock to pin 3, S3 to pin 4, VSS to pin 5, DATA/programming I/O to pin 6, LED cathode connection to pin 7, and VDD to pin 8. Confirm programming and transmitter circuitry against the manufacturer's diagrams.

Apply the detailed manufacturer DC and timing limits at the actual supply, output load, and temperature.

Other code-hopping encoders can differ in word format, modulation, provisioning, receiver learning, package, and grade. HCS360 is not a drop-in replacement solely because its eight-pin outline resembles another HCS device. No unverified internal alternative link is provided.

Microchip Technology's HCS360 KEELOQ Code Hopping Encoder data sheet, DS40152E, is the technical basis for this description, including the feature list, pin table, transmission format, electrical characteristics, and product-identification system. Check current manufacturer documentation and lifecycle notices during design review.

Confirm marking, lot traceability, SOIC dimensions, supply behavior, button inputs, DATA waveform, and LED behavior. Protect provisioning keys and verify receiver enrollment and synchronization on the actual hardware. Assess legacy cipher suitability for the current threat model.

Use the current Microchip data sheet for final electrical limits, programming sequences, RF timing, footprint drawing, and key management. Restore and inspect the production package image before formal publication.