From "DS40044A-page 141" :

1% @ 3.5V and +25 degC
2% @ 2.0 - 5.5V and 0 - +85 degC
5% @ 2.0 - 5.5V and -40 - +85 degC

So it depends...

Jan-Erik.

>
> > the way I read the datasheet, the 628A internal oscillator should
> > ALWAYS be stable enough for serial comm.  Not so?
>

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