Allowable high frequency variation of MPU supply voltage ?

[jbrydon]

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) ?

 

[embeddedlover]

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

 

[jbrydon]

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