Vyacheslav Krutov

MCF51CN128 and external clocking voltage level

Discussion created by Vyacheslav Krutov on Jun 6, 2011
Latest reply on Jun 6, 2011 by Jim Donelson

I'm a little confused after browsing datasheet and reference manual. I couldn't find information about the voltage level of external clock for the cpu. In my current desigh there are many ICs required clocking, so I decided to use programmable  PLL-based synthesizer with multiple outputs, like CDCE925, CDCE949. 

Do I have to use VDD level clock ? I have a lot of experience with ARM based MCUs, and a lot of them require 1.8V level external clock signal. There is no information regarding the external clock voltage level in the datasheets exposed on the web site.