Maximum frequency signal in an IC packaged with DIP (Dual In-Line Package)

[palmeiras]

Hello guys,

I'm designing a simple IC with a signal around 1 MHz. Can I measure it if my IC will be packaged with DIP?
What is the maximum frequency (without attenuation) of a signal that can be measure in DIP packages?

Thanks and best regards,

 

[FvM]

You can't estimate maximum frequencies without knowing the internal pin and external circuit impedance. Assume 5 nH series inductance for each DIL package pin (including power and ground) as a first guess and see how it works.

 

[andre_luis]

What is the maximum frequency (without attenuation) of a signal that can be measure in DIP packages?

Any sort of attenuation will always happen, so you need to establish evaluation criteria to check how the waveform meets the established requirements/standards; anyway, in this specific case perhaps the aspect to be considered is not properly the external attenuation, but rather internal propagation delay and/or slew rate.

 

[biff44]

a couple hundred MHz i would guess. The question is...is there a good quality ground pin coming out anywhere near your signal pin, so that a microstrip board run can be initiated.

1 Mhz is no problem at all

 

[palmeiras]

Thanks guy for all contributions.
There is a input pin connected in a CMOS inverter that will receive a signal of 1 MHz. And the output pin is connected in a open-drain transistor, whose output signal will be around 1 MHz too. In this case, we are going to measure it using a high-impedance probe.
My concern is the parasitic capacitance between the output pin and ground.

biff44, please, what do you mean with a good ground pin coming out?
Do you think that microstrip board is needed for this 1 MHz? I mean, the frequency is low and the lines do not perfom as transmission line, dont it?