At 11:23 PM 3/25/97, Elvin Slavik wrote:

>Has anyone any comments/experience on running a 16C84 @ 11.0592MHz.
>I know it is 1.0592Mhz faster than the rating, but what I'm thinking
>about is sharing the clock on a circuit which already has an Atmel
>89C2051 running @ 11.0592MHz with a '84.

I believe they are rated to 10 MHz; I use them for PROTOTYPING ONLY at
speeds up to 16 MHz; 20 MHz will not work; 18 MHz on a good day, certainly
not reliable.  Is this design for production?  If no, then go ahead and use
the 11 MHz signal.  If it will be in production in any quantity, you will
absolutely want to speak with someone at MCHIP.  Do you need the EEPROM, or
could you switch over to a less-expensive variant, such as the 16C61-20 or
such, that is rated at 20 MHz?  Also, will your supply voltage stay a
constant, good +5V?  How about temp range?  I believe these somewhat affect
what freq. range is likely to work.  Anyone know if MCHIP plans a 20 MHz
'84?  That would be ideal for quick prototyping fast circuits.

 -Todd




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