I am testing a novel detector. I need to generate very sharp pulses, got
around 400ps with a Spartan3, seeking for cheaper and better solutions.


On Tue, Jul 16, 2013 at 4:53 PM, Isaac Marino Bavaresco <
isaacbavaresco@yahoo.com.br> wrote:

> Well, it is the first time you mention the name of the chip. Yes,
> probably parts in the same family will have the same performance for the
> same conditions.
> I don't see the point of worrying about rise and fall times for a LED.
> Do you intend to use it to transmit data in the 100's of Mbps range?
>
> Isaac
>
>
>
> Em 16/07/2013 10:33, Yigit Turgut escreveu:
> > Shouldn't hardware pwm behave identical between families -assuming- the
> > same clock,configuration and load ? I am currently looking into smaller
> > packages like 18f2550. Load has small resistance and capacitance it's a
> LED.
> >
> >
> > On Tue, Jul 16, 2013 at 4:22 PM, <alan.b.pearce@stfc.ac.uk> wrote:
> >
> >> ... and the pin loading, and the switching frequency, and the ...
> >>
> >> There are so many things that change the rise and fall times of a pin
> that
> >> a datasheet can only specify it at one notional capacitance. And for
> >> practical uses the switching times of a pin are irrelevant. If somethi=
ng
> >> needs defined switching times there will be a driver chip capable of
> >> driving large currents through a capacitive load to achieve the requir=
ed
> >> times.
> >>
> >>
> >>
> >>
> >>> -----Original Message-----
> >>> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
> >> Behalf Of Isaac
> >>> Marino Bavaresco
> >>> Sent: 16 July 2013 14:11
> >>> To: Microcontroller discussion list - Public.
> >>> Subject: Re: [EE] PIC Hardware PWM
> >>>
> >>> It may help if you tell us what is the chip/MCU, etc..
> >>>
> >>> Isaac
> >>>
> >>>
> >>>
> >>> Em 16/07/2013 07:52, Yigit Turgut escreveu:
> >>>> Hi everyone,
> >>>>
> >>>>  While checking the datasheets I couldn't get any information
> >>>> regarding the electrical specifications of hardware pwm, like
> >> rise/fall times and
> >>> so on.
> >>>> I had implemented a couple of years ago in a and AFAIR the rise time
> >>>> was around 2ns.
> >>>>
> >>>> I am sure somebody here has this info.
> >>>>
> >>>> Thank you.
> >>>> Yigit
> >>> --
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