there is a romanian CMOS chip which maybe has an international
equivalence:
MMC22925/MMC22926/ MMC22927

it consist of four counters ( different chips are able to number in
different ways up to 24, 10 or 60 ), four memory register, BCD to 7 seg
decoder and multiplexer, it could be daisy-chained up to your
requirements and needs only clk, memory and reset pins.

The major disadvantage comparing the 595 is: it can't display alfanumerics
like a...f, the major advantage: it needs only 3 chips for 12
LED_7seg_displays

a simple jal library at:
http://www.piclist.com/jal

regards,
Vasile
http://www.geocities.com/vsurducan


On Wed, 11 Sep 2002, Fritz Braun wrote:

> You could use one 74hc595 per 7 seg display and use only 3 lines from your
> pic to do the work. Basically consists of shifting out the 10 characters
> and clocking them into the 595's. Brightness could be controlled via pwm by
> a simple 555 circuit.
>
> Fritz
> ----- Original Message -----
> From: "Nathan Hurst" <njh@MAIL.CSSE.MONASH.EDU.AU>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: 10 September, 2002 23:13
> Subject: Re: [PIC]: BCD-Decimal and BED-7-Segment ICs with >20 mA drive
> capability
>
>
> > On Tue, 10 Sep 2002 19:59:08 -0700
> > "Brooke Clarke" <brooke@PACIFIC.NET> wrote:
> >
> > > Hello:
> > >
> > > I would like to make a 10 digit clock using a 16F628.  The idea is to
> use a hex
> > > to 7-segment decoder like the DM9368 which I think can handle 20 mA and
> a BCD to
> > > Decimal converter like the 74HC42 except with more current capability.
> This way
> > > all 10 digits can be driven using only 8 I/O pins.
> > >
> > > Is there a BCD to Decimal converter IC like the 74HC42 that can handle
> 20 mA?
> >
> > You could buffer it with something like a ULN2804.
> >
> > --
> > njh
> > http://www.csse.monash.edu.au/~njh/
> >
> > --
> > http://www.piclist.com hint: The list server can filter out subtopics
> > (like ads or off topics) for you. See http://www.piclist.com/#topics
> >
> >
> >
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.