YM3404DF or YM3619DF
(16 bit over sampling digital filter)
  YM3619   YM3404   Pin­Name
       Pin No.           Pin No.
    …..11.....................7................SDI..........
    …..10.....................6...............SDSY.......
    …...8.....................5...............BCI..........
    …...4.....................3...............XI.............
    …...3.....................2...............XO...........
    ….22...................14...............ST............
    ….23...................15...............FEN.........
    ….13.....................9...............DLO.........
    ….14....................10...............DRO........
    ….15....................11...............WCO........
    ….17....................12...............BCO.........
    …..2......................1...............SHL..........
    ….24...................16...............SHR.........
    ….12.....................8...............VDD1.......
    …..5.....................4...............VDD2.......
    ….20...................13...............VSS.........
Remark
YM3619; not used pins has been left open,
               NO connecting to ground.
 
Source
ServiceManual of YAMAHA CDX­900/CDX­900U
CompactDisc Player
3.25K­363  Printed in Japan '87.3