Ken Pergola wrote:

   > The following PIC18 PICmicros have been labeled "mature" by
   > Microchip, and
   > as such, are not recommended for new designs:
   >
   > PIC18F242
   > PIC18F252
   > PIC18F442
   > PIC18F452  <=== My buddy! :(
   >Microchip recommends the following as the 'Recommended Design-In
   > Device' replacements:
   >
   > MATURE             REPLACEMENT
   > ------             -----------
   >
   > PIC18F242   ===>   PIC18F2420
   > PIC18F252   ===>   PIC18F2520
   > PIC18F442   ===>   PIC18F4420
   > PIC18F452   ===>   PIC18F4520
   >
   >
   > Actually, this is not a bad deal since the new parts have more
   > features and
   > *might* even be cheaper.
   >
   > Ken Pergola
   >

I too think of the 18F452 as "my buddy"!!!  I really like that chip!
The 18Fxxxx replacements don't seem too bad but I noticed on the 18F4520,
the data sheet lists max speed as 8 MHz, 32MHz w/PLL.  This is a lot slower
than the 18F452 (10 MHz, 40 w/PLL).  Is this an error in the data sheet (not
likely)
or did MChip discover something about the 18Fxxx?  I can't understand why
there would be a
major speed diff between the two (very similar) lines.
Carey Fisher

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