pleaze any one can answer me what is the difference between...
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Posts: 46,084
In a message dated 7/3/2003 11:40:29 PM Pacific Daylight Time,
rme90@y... writes:
> plz tell me the difference between pin 4(Vss)and pin 23 (Vss)?
>
>
> thx for helping...........Romero
Romero,
The two pins are the same.
[noparse][[/noparse]Non-text portions of this message have been removed]
rme90@y... writes:
> plz tell me the difference between pin 4(Vss)and pin 23 (Vss)?
>
>
> thx for helping...........Romero
Romero,
The two pins are the same.
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
> In a message dated 7/3/2003 11:40:29 PM Pacific Daylight Time,
> rme90@y... writes:
>
> > plz tell me the difference between pin 4(Vss)and pin 23 (Vss)?
> >
> >
> > thx for helping...........Romero
>
> Romero,
>
> The two pins are the same.
Well, they are different numbers and on different sides of the chip
so there is some great schematic and layout differences, so although
electronically they are the same, physically, they are different.
and if you have ever had to run a trace over the mountain and thru
the woods, you do appreaciate the difference.
Dave
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
placed for connection to a serial port, and the other's with the power
circuitry. No technical difference, just placed for convenience I guess...
- Robert
Original Message
From: <smartdim@a...>
To: <basicstamps@yahoogroups.com>
Sent: Friday, July 04, 2003 9:23 AM
Subject: Re: [noparse][[/noparse]basicstamps] pleaze any one can answer me what is the
difference between...
> In a message dated 7/3/2003 11:40:29 PM Pacific Daylight Time,
> rme90@y... writes:
>
> > plz tell me the difference between pin 4(Vss)and pin 23 (Vss)?
> >
> >
> > thx for helping...........Romero
>
> Romero,
>
> The two pins are the same.
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
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>
is to reduce the amount of noise on the
ground lines.
Digital logic has high-frequency switching
transients. If you have a long single ground
wire, it looks like a (small) inductance.
(An inductor is like a small coil. It maintains
a magnetic field while current is flowing.
When the circuit is broken, the collapse
of the magnetic field makes current continue
to flow. Thus inductance slows the
instantaneous change of current.)
(Even if the 'inductor' is a long straight
wire, there is a little of this magnetic
effect.)
When you have a switching transient, a lot
of current is needed for a very short time.
The inductance of the wire means that there
is a ramp-up time for the current to get to
the chip. While this ramp-up is occurring,
the voltage at the chip drops -- thus giving
you a downwards voltage spike, (called
ground bounce) which in turn
affects how fast the chip can switch.
One way to prevent this is to have multiple
connections to ground. This reduces the
effective length of the ground wire, and
thus reduces the inductance of the connection
to ground.
This also allows 'high-current'
devices to have a different path to ground
than lower current devices, which reduces
the amount of ground-bounce noise coupled
between devices.
--- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
wrote:
> --- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> > In a message dated 7/3/2003 11:40:29 PM Pacific Daylight Time,
> > rme90@y... writes:
> >
> > > plz tell me the difference between pin 4(Vss)and pin 23 (Vss)?
> > >
> > >
> > > thx for helping...........Romero
> >
> > Romero,
> >
> > The two pins are the same.
>
>
> Well, they are different numbers and on different sides of the chip
> so there is some great schematic and layout differences, so
although
> electronically they are the same, physically, they are different.
>
> and if you have ever had to run a trace over the mountain and thru
> the woods, you do appreaciate the difference.
>
> Dave
>
>
>
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
(no "language lawyer" flames, please...It just struck me as funny at the
time...)
>Message: 15
> Date: Fri, 4 Jul 2003 22:09:18 -0600
> From: "Robert Ussery" <uavscience@f...>
>Subject: Re: pleaze any one can answer me what is the difference
between...
>
>Yah, they're linked to the same silicone inside, just one's conveniently
>placed for connection to a serial port, and the other's with the power
>circuitry. No technical difference, just placed for convenience I guess...
>
>- Robert
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