Anyone know of a good Hobbiest friendly source of these chips? What price
are they for 1-25 quantity?

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A member of the PI-100 Club:
3.1415926535897932384626433832795028841971693993751
058209749445923078164062862089986280348253421170679

On Thu, 16 Sep 1999, Quentin wrote:

> There are a few ways to do it (multiplexing with logic IC's, etc.) but
> when I need to expand my I/O's, I use I2C.
> http://www-us2.semiconductors.philips.com/i2c/
> will give you lots of information. I use the PC8574P which is an 8 bit
> I2C I/O. For 36 I/O on say a 16F84, I would use 4x PC8574P and an
> additional 4 I/O on the PIC. Add to that the two pins for the I2C bus
> and you will still have some spare I/O on the PIC to do other stuff
> with.
>
> Of course, if you haven't done it yet, you'll have to learn how to I2C.
> But once you know it, it opens a new world of possibilities for the PIC.
>
> Quentin
>