Intersil HD9P6409-9

The HD-6409 converts nonreturn-to-zero serial data to Manchester II code and decodes received Manchester data back to NRZ. Converter mode supports a transmit/receive endpoint; repeater mode reconstructs incoming coded data using a recovered clock. A digital phase-locked loop provides receive timing. The device supplies coding and synchronization functions, not a complete communications protocol or isolated line interface.

The Intersil FN2951.3 ordering table assigns exact HD9P6409-9 to a 20-lead SOIC, package drawing M20.3. The catalog's 0.295-inch (7.50-mm) wide 20-SOIC entry normalizes to the registered 20-SOIC package. The non-Z and Z codes may differ in lead finish and Pb-free handling; do not substitute one procurement code for the other without a controlled assessment.

Layout checks

• Confirm M20.3 body and lead pitch against the land pattern.
• Orient pin one using the manufacturer's top view.
• Verify lead finish and assembly profile from the actual lot.

The 20-SOIC package is registered locally, but its JPG is absent; retain manual review.

The Intersil 20-lead top view assigns BZI/BOI/UDI to decoder inputs at pins 1-3; SD/CDS at pin 4 is serial data input in converter mode or sync-status output in repeater mode. SDO, SRST, NVM, DCLK and RST occupy pins 5-9; GND is pin 10. CO, IX, OX, MS, CTS, ECLK and SS occupy pins 11-17. BZO and BOO are encoder outputs at pins 18-19; VCC is pin 20.

Check polarity, mode-dependent behavior and decoupling against the data sheet before layout.

Observe data-sheet test conditions and distinguish typical values from guaranteed limits.

No LCDChip internal alternate has been verified or linked. The later HD9P6409-9Z is a Pb-free SOIC order code in the manufacturer's family table, but it is not an automatic procurement or process substitution for non-Z stock. Compare package drawing, lead finish, solder profile, timing, operating grade, markings and lifecycle before any change. The HD3-6409 PDIP family member requires a different board footprint.

Intersil's October 2008 data sheet FN2951.3 explicitly lists HD9P6409-9 and its M20.3 SOIC package. The manufacturer's product-life-cycle notice PLC15033 later lists the original code for withdrawal and obsolescence. Renesas' present HD-6409 literature highlights Pb-free -9Z ordering; that current suffix must not be mistaken for the catalog's exact non-Z product.

Confirm traceable non-Z lot markings, date code, package drawing M20.3, lead condition and storage history. The original code's end-of-life notice makes broker listings particularly sensitive to lot age and authenticity. Catalog stock and base price are separate fields; current exact-code listings report divergent stock and quantity prices, so obtain a dated authorized quote before commercial changes or release.

Keep HD9P6409-9 under manual review. Restore the registered 20-SOIC JPG, verify the lot's non-Z marking and lead finish, reconcile authorized exact-part inventory and tier pricing, and repeat hash, package and rendered-page checks before any human publication decision. A Pb-free suffix change is not approved by this page.