This just won't die! How much do you think Mchip has invested it the equipment they use to test PICs for speed before marking them. I expect it would be _far_ cheaper to buy -20 parts than to replicate Mchip's testing to make sure your -04 will work reliably at -20. Bob Ammerman RAm Systems (contract development of high performance, high function, low-level software) ----- Original Message ----- From: Andy Howard To: Sent: Monday, November 06, 2000 5:46 AM Subject: Re: [PIC]: 16F84A - 4MHz or 20MHz? > From: "Roman Black" > To: > Sent: Monday, November 06, 2000 5:30 AM > Subject: Re: [PIC]: 16F84A - 4MHz or 20MHz? > > > > > I thought it was interesting when someone mentioned that the > > 20MHz parts may be re-badged as 4MHz etc to suit sales > > demand. Is there a way to test this? What about just overclocking > > it until it starts to fail and that might tell?? I have never > > overclocked a PIC so I wouldn't even know what to look for > > when it starts to fail... Thermal shutdown? Program crashes? > > Keeps resetting?? > > It'd probably need to be more rigourous than just ramping up the clock to > discover if it was a rebranded 20MHz part. You could, e.g., have code to > exercise all parts of the PIC then run it at a variety of voltages and > temperatures with real-world type loads and/or inputs. > > As others have said, for the small difference in price it's worth getting > the right part for the job and having peace of mind. > > > . > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST > > > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! use mailto:listserv@mitvma.mit.edu?body=SET%20PICList%20DIGEST