Pioneer remote IC

IC D17240 is in this remote for my P99RS. I'm having trouble identifying the exact one. I thought it was UPD17240 as it's listed as general purpose IR remote control transmitters... but they are only 24pins?

The only other I've found is ISD17240 but it says that one if for voice rec/play... and is only 28pins...

Anyone know the exact part number of this 30 pin IC?
 

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