Changing 5v to 3v logic
Hi,
Does any one know how I can change the stamps 5 volt logic to 3v for a chip.
I need to change about 5 lines.
Is there some kind of buffer I can supply with 3v and will tolerate 5 on an
input, or do I just use resistors?
Thanks
Mike
Does any one know how I can change the stamps 5 volt logic to 3v for a chip.
I need to change about 5 lines.
Is there some kind of buffer I can supply with 3v and will tolerate 5 on an
input, or do I just use resistors?
Thanks
Mike
Comments
If you simply want to input 3V to a Stamp, you don't need to change
anything, the BS2 reads anything over 1.5 volts as a "1" and
everything below that as a "0".
-Chris
--- In basicstamps@egroups.com, "Michael Licitra" <mikel2@b...> wrote:
> Hi,
>
> Does any one know how I can change the stamps 5 volt logic to 3v
for a chip.
> I need to change about 5 lines.
>
> Is there some kind of buffer I can supply with 3v and will tolerate
5 on an
> input, or do I just use resistors?
>
> Thanks
> Mike
Thanks
Original Message
From: "Chris " <c_rosney@y...>
To: <basicstamps@egroups.com>
Sent: Thursday, May 11, 2000 8:11 PM
Subject: [noparse][[/noparse]basicstamps] Re: Changing 5v to 3v logic
> Mike,
>
> If you simply want to input 3V to a Stamp, you don't need to change
> anything, the BS2 reads anything over 1.5 volts as a "1" and
> everything below that as a "0".
>
> -Chris
>
>
> --- In basicstamps@egroups.com, "Michael Licitra" <mikel2@b...> wrote:
> > Hi,
> >
> > Does any one know how I can change the stamps 5 volt logic to 3v
> for a chip.
> > I need to change about 5 lines.
> >
> > Is there some kind of buffer I can supply with 3v and will tolerate
> 5 on an
> > input, or do I just use resistors?
> >
> > Thanks
> > Mike
>
>
>
>
>
If speed is important, take a look at Fairchild's NC7SZ86M. It's an XOR
gate, usable as a buffer, and it accepts 5V in while it's on a 3V supply.
Only one gate per (tiny) package, but Fairchild may have something
equivalent with multiple gates per package...
>Does any one know how I can change the stamps 5 volt logic to 3v for a chip.
>I need to change about 5 lines.
>
>Is there some kind of buffer I can supply with 3v and will tolerate 5 on an
>input, or do I just use resistors?
Mike Hardwick, for Decade Engineering -- <http://www.decadenet.com>
Manufacturer of the famous BOB-II Serial Video Text Display Module!
-William
Original Message
From: Michael Licitra <mikel2@b...>
To: <basicstamps@egroups.com>
Sent: Thursday, May 11, 2000 8:25 PM
Subject: Re: [noparse][[/noparse]basicstamps] Re: Changing 5v to 3v logic
> I need to go from the stamp to the 3v device.
>
> Thanks
>
Original Message
> From: "Chris " <c_rosney@y...>
> To: <basicstamps@egroups.com>
> Sent: Thursday, May 11, 2000 8:11 PM
> Subject: [noparse][[/noparse]basicstamps] Re: Changing 5v to 3v logic
>
>
> > Mike,
> >
> > If you simply want to input 3V to a Stamp, you don't need to change
> > anything, the BS2 reads anything over 1.5 volts as a "1" and
> > everything below that as a "0".
> >
> > -Chris
> >
> >
> > --- In basicstamps@egroups.com, "Michael Licitra" <mikel2@b...> wrote:
> > > Hi,
> > >
> > > Does any one know how I can change the stamps 5 volt logic to 3v
> > for a chip.
> > > I need to change about 5 lines.
> > >
> > > Is there some kind of buffer I can supply with 3v and will tolerate
> > 5 on an
> > > input, or do I just use resistors?
> > >
> > > Thanks
> > > Mike
> >
> >
> >
> >
> >
>
>
>
>
might have read his message a bit better.
regards,
Sandor
William Cox wrote:
> You can just use PWM. Read the manual.
> -William
> [noparse][[/noparse]snip]
chip.
>I need to change about 5 lines.
>
>Is there some kind of buffer I can supply with 3v and will tolerate 5 on
an
>input, or do I just use resistors?
The CD4050 and CD4049 (inverting) are hex CMOS buffers that can accept
input voltages higher than their power supply. Resistors wouldn't be bad
either, especially using a couple of sip packages.
-- Tracy Allen
Electronically Monitored Ecosystems
http://www.emesystems.com
-William
Original Message
From: Sandor Rabe <sandor.rabe@e...>
To: <basicstamps@egroups.com>
Sent: Friday, May 12, 2000 8:50 AM
Subject: Re: [noparse][[/noparse]basicstamps] Re: Changing 5v to 3v logic
> I don't think he can for this purpose: instead of him reading the manual
you
> might have read his message a bit better.
>
> regards,
>
> Sandor
>
> William Cox wrote:
>
> > You can just use PWM. Read the manual.
> > -William
> > [noparse][[/noparse]snip]
>
>
>
parallel.
Bean, thitt@i...