Lauw Lim Un Tung wrote:

>It's better if you build your project with MC145447 (CNID IC) and display
>the result to small LCD 16x2 than you make scanning display with LED
>Matrix, because it has more difficulties.

  Bingo!  The datasheet's on the Web at

    http://design-net.com/books/dl136/pdf/mc145447rev1.pdf

  an answer in a can.  Interesting reading.  Thank you.

  -- Hank