i found another one. with an altera 3032 (plcc44, 3v3) you get 32 outputs
for $1





Tal Dayan <tal@ZAPTA.COM>
Gesendet von: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
20.06.02 16:43
Bitte antworten an pic microcontroller discussion list


        An:     PICLIST@MITVMA.MIT.EDU
        Kopie:
        Thema:  Re: [PIC]: cheapest way for adding output pins ?


Thanks Al. I will take a look at the tuturial.

What is the estimated cost per output 100 pin when using CPLD ?

(assuming large quantities and surface mount)

Thanks,

Tal

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Al Williams
> Sent: Thursday, June 20, 2002 6:14 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: cheapest way for adding output pins ?
>
>
> Consider using a CPLD device. I have a tutorial for the Xilinx CPLDs
> that includes a project that hooks up (I think) 32 I/O to a Basic Stamp.
> The design could easily be expanded to handle more pins in a 95108
> device. Two of these would get you there. We don't sell the expander per
> se as a product, but our Xilinx prototyping boards are great for getting
> started with this type of technology.
>
> The other alternative, since you only need outputs, is a shift register,
> but that is a whopping number of packages. The device in the tutorial is
> really just a way to gang a bunch of shift registers, but they are all
> in one semi-custom chip (and they are fairly cheap). With a CPLD in PLCC
> packaging you'd need two. If you were willing to go with surface mount
> (like a TQFP package) you could do it in one package plus have enough
> spare to do some other things if you wanted to.
>
> The tutorials (along with an Altera and PIC tutorial) are at
> http://www.al-williams.com/pictutor
>
> Good luck!
>
> Al Williams
> AWC
> * Easy RS-232 Prototyping
> http://www.al-williams.com/awce/rs1.htm
>
>
>
> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Tal Dayan
> > Sent: Wednesday, June 19, 2002 11:18 PM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [PIC]: cheapest way for adding output pins ?
> >
> >
> > Hello,
> >
> > One of the designs I am working needs many (100 to 200)
> > outputs pins (0/5V
> > signal) controlled by a single mid size PIC. What is the
> > cheapest way (cents per output pin) adding output pins to a PIC ?
> >
> > This is a mass production product but an ASIC is out of
> > question at this point.
> >
> > Speed is not an a primary issue so using reasonable serial
> > communication is OK.
> >
> > Thanks,
> >
> > Tal
> >
> > --
> > http://www.piclist.com hint: To leave the PICList
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> >
>
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