Re: overshoot problem of EPM7128S

Uzytkownik "Jian Ju" <[EMAIL PROTECTED]> napisal w wiadomosci
news:[EMAIL PROTECTED]
> Hi,
>
> I have a project where one of the output signals is a short pulse with a
> width of 100ns and repeat frequency of 1MHz. The main clock in my design
is
> 20MHz. After I download the program to the chip (EPM7128SLC-7) severe
> overshoots (over 2V @VCC=5V)can be observed. Does anybody know an answer
to
> this problem?

A serial inductance at the power path can do the overshoots or a switching
power supply generates pulses of voltage at times where large current
changes are observed (shortcut to ground or VCC at output pin).

Regards,
krzysiek