Part Information Review and Datasheet Update

Thought for 4 mins 13 sec

I reviewed the part project for YMF262-M and cross-checked it against a Yamaha YMF262 archived datasheet scan.

Part info review

Table

Field	Current project	Datasheet cross-check	Status
MPN	YMF262-M	Matches	✅
Manufacturer	Yamaha	Matches	✅
Description	SOUND GENERATOR CIRCUIT, 24 Pin, SOP	Consistent with Yamaha OPL3 FM operator, 24-pin SOP package	✅
Datasheet URL	Present: `datasheetarchive` mirror	URL already exists, so no update was needed	✅
Pin count	24 terminal components	Datasheet shows 24-pin SOP	✅
Package	Described as SOP	Datasheet explicitly says 24 Pin SOP Package (YMF262-M)	✅
Footprint	`SOIC127P1180X250-24N.kicad_mod`	Name strongly suggests 24 pins, 1.27 mm pitch, SOP/SOIC family	✅ / partial

Key datasheet specs

Table

Item	Datasheet value
Device	Yamaha YMF262 (OPL3) FM Operator Type L3
Supply	+5 V single supply
Package	24-pin SOP for YMF262-M
Master clock	14.32 MHz typ, 10 to 16 MHz allowed
Outputs	4-channel audio data interface
CPU bus	8-bit parallel interface
Sampling frequency	49.7 kHz
Package pitch	1.27 mm typ
Body length	15.50 ± 0.30 mm

Symbol / pin cross-check

Good news:

The symbol has 24 terminals, matching the datasheet pin count.
The terminal names appear to match the datasheet pin list overall:
- supply, control, address, data bus, DAC timing/data, and clock pins are all present
Pin numbering in the symbol is populated for all terminals.

Mismatches and gaps found

Table

Area	Finding	Severity
Pin types	All 24 terminals are set to `Pin Type: Unspecified`	High
Pin descriptions	The project does not currently store the datasheet pin functions/descriptions on the terminals	High
Special electrical behavior	Datasheet-specific behaviors are not captured: open-drain `/IRQ`, pull-up inputs `/IC` and `/CS`, TEST normally NC, bidirectional data bus pins	High
Footprint verification depth	I could confirm 24 pads and a SOP/SOIC-style footprint, but the exposed layout data does not include enough geometry to fully verify pad sizes/toe/heel against the datasheet drawing	Medium
Naming style	The project uses `ØM` / `ØSY`; datasheet OCR renders these as `0M` / `0SY`, which is likely just character recognition noise, not a real mismatch	Low

What this means

The part is mostly structurally correct:

MPN, manufacturer, description, package family, and pin count all line up.
The footprint appears broadly consistent with a 24-pin, 1.27 mm pitch SOP/SOIC.

But the part is not yet fully datasheet-synced because:

terminal electrical types are missing
terminal descriptions are missing
key pin semantics from the datasheet are not encoded

Recommended fixes

Add terminal pin types from the datasheet:
- power, ground, input, output, bidirectional, open-drain, etc.
Add per-pin descriptions/functions.
Mark the TEST pin as normally NC in its description.
Preserve the current datasheet URL unless you specifically want an archived Yamaha scan URL swapped in.

If you want, I can next:

update all terminal properties to match the datasheet pin table, or
do a stricter footprint audit against the SOP-24 mechanical drawing.

Fix terminal properties

Audit the footprint

Check electrical rules

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