Allowable high frequency variation of MPU supply voltage ?

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jbrydon

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In an MPU with a supply voltage range of 3.3 to 5 volts I want to use the output of a switch mode chip that has a ripple of about a volt within that range to provide the supply voltage. Datasheets are silent on the allowable ripple, both magnitude & frequency. Texas Instruments says that's not a parameter they quote. Any ideas on deciding the allowable parameters (other than experiment) ?
 

You mave have to check how the power is being distributed to various peripherals inside the processor and their tolerances.
 

In theory, yes, but this is not the sort of data that is available for commercial MPUs.
 

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