A range of 3wire displays are made by III-V systems, and stocked by Farnell
 in the UK.  They include 2 digit and 4 digit 7seg displays in red and
green.

They are all based on the MM5450N display driver chip, which takes 34 serial
data bits in on the 3 wire interface and controls 34 LED segment drivers.

Andy
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Andrew M Errington                               Tel: +44 1524 593678
Microcomputer Consultant                         Fax: +44 1524 844011
Lancaster University                      a.errington@lancaster.ac.uk
Lancaster LA1 4YW     http://www.lancs.ac.uk/people/cpaame/cpaame.htm
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>Does anyone know where I can purchase LT8522 led display referrenced in
>AN592? Is there a "better" device? I'm looking for any serial led display
>with at least 3 seven seg. displays and built in logic/latches for serial
>interface.  Thanks, Eric Seeley