Author: Michael A. TerrellDate: 13:15 07-04-08
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Jon Slaughter wrote:
>
> How the heck do you determine the first pin when there is no notch or any
> special char or anything at all except a line and text? Does the line on
> the side indicate the top? On the datasheet it shows the normal dot where
> the first pin is but there is no dot on the chip itself ;/
What package?
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Author: Jon SlaughterDate: 13:21 07-04-08
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How the heck do you determine the first pin when there is no notch or any
special char or anything at all except a line and text? Does the line on
the side indicate the top? On the datasheet it shows the normal dot where
the first pin is but there is no dot on the chip itself ;/
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Author: Mike SilvaDate: 13:28 07-04-08
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On Apr 7, 2:22=A0pm, "Jon Slaughter" <Jon_Slaugh...@Hotmail.com> wrote:
> "Jon Slaughter" <Jon_Slaugh...@Hotmail.com> wrote in message
>
> news:NwsKj.482$%41.204@nlpi064.nbdc.sbc.com...
>
> > How the heck do you determine the first pin when there is no notch or an=
y
> > special char or anything at all except a line and text? =A0Does the line=
on
> > the side indicate the top? On the datasheet it shows the normal dot wher=
e
> > the first pin is but there is no dot on the chip itself ;/
>
> BTW, the chip is the TMP275. It has a long line at the top or bottom(not o=
n
> pins sides) and some text.
>
> =A0* =A0* =A0* =A0*
> | TI TMP275
> | =A0 =A0 etc
> |
> =A0* =A0* =A0* =A0*
>
> the | is the line and * are the pins
The line has always been at the notch end on any chip I've ever seen.
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Author: Jon SlaughterDate: 13:40 07-04-08
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"Jon Slaughter" <Jon_Slaughter@Hotmail.com> wrote in message
news:NwsKj.482$%41.204@nlpi064.nbdc.sbc.com...
> How the heck do you determine the first pin when there is no notch or any
> special char or anything at all except a line and text? Does the line on
> the side indicate the top? On the datasheet it shows the normal dot where
> the first pin is but there is no dot on the chip itself ;/
>
>
>
BTW, the chip is the TMP275. It has a long line at the top or bottom(not on
pins sides) and some text.
* * * *
| TI TMP275
| etc
|
* * * *
the | is the line and * are the pins
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Author: Michael A. TerrellDate: 13:49 07-04-08
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Jon Slaughter wrote:
>
> "Jon Slaughter" <Jon_Slaughter@Hotmail.com> wrote in message
> news:NwsKj.482$%41.204@nlpi064.nbdc.sbc.com...
> > How the heck do you determine the first pin when there is no notch or any
> > special char or anything at all except a line and text? Does the line on
> > the side indicate the top? On the datasheet it shows the normal dot where
> > the first pin is but there is no dot on the chip itself ;/
> >
> >
> >
>
> BTW, the chip is the TMP275. It has a long line at the top or bottom(not on
> pins sides) and some text.
>
> * * * *
> | TI TMP275
> | etc
> |
> * * * *
>
> the | is the line and * are the pins
What KIND of package?
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Author: Jon SlaughterDate: 14:00 07-04-08
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"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:EbCdnTKxUaNYw2fanZ2dnUVZ_tPinZ2d@earthlink.com...
>
> Jon Slaughter wrote:
>>
>> "Jon Slaughter" <Jon_Slaughter@Hotmail.com> wrote in message
>> news:NwsKj.482$%41.204@nlpi064.nbdc.sbc.com...
>> > How the heck do you determine the first pin when there is no notch or
>> > any
>> > special char or anything at all except a line and text? Does the line
>> > on
>> > the side indicate the top? On the datasheet it shows the normal dot
>> > where
>> > the first pin is but there is no dot on the chip itself ;/
>> >
>> >
>> >
>>
>> BTW, the chip is the TMP275. It has a long line at the top or bottom(not
>> on
>> pins sides) and some text.
>>
>> * * * *
>> | TI TMP275
>> | etc
>> |
>> * * * *
>>
>> the | is the line and * are the pins
>
>
> What KIND of package?
>
SOIC but not sure why that matters
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Author: Jon SlaughterDate: 14:00 07-04-08
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"Mike Silva" <snarflemike@yahoo.com> wrote in message
news:f9c9eebc-73c0-4b6a-95b9-2a3043357de6@x41g2000hsb.googlegroups.com...
On Apr 7, 2:22 pm, "Jon Slaughter" <Jon_Slaugh...@Hotmail.com> wrote:
> "Jon Slaughter" <Jon_Slaugh...@Hotmail.com> wrote in message
>
> news:NwsKj.482$%41.204@nlpi064.nbdc.sbc.com...
>
> > How the heck do you determine the first pin when there is no notch or
> > any
> > special char or anything at all except a line and text? Does the line on
> > the side indicate the top? On the datasheet it shows the normal dot
> > where
> > the first pin is but there is no dot on the chip itself ;/
>
> BTW, the chip is the TMP275. It has a long line at the top or bottom(not
> on
> pins sides) and some text.
>
> * * * *
> | TI TMP275
> | etc
> |
> * * * *
>
> the | is the line and * are the pins
The line has always been at the notch end on any chip I've ever seen.
Thats the way it seems and was my first thought but just making sure.
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"Jon Slaughter" <Jon_Slaughter@Hotmail.com> writes:
> Huh? Where does it talk about beveled edge? And FYI all the edges are
> beveled.
Page 15 of the PDF shows the mechanical drawing of the package.
The overhead diagram shows the bevel on the bottom edge, and the end
view (middle right) shows an extra bevel on one side (edge) and not
the other.
No, it doesn't have a big NOTE: BEVEL MEANS PIN ONE to make it
obvious, but sometimes it's these subtle things you have to look for.
It does have a "Pin 1 Index Area" note, though, so if there's
something that might be a mark in one of the corners, that would be
it. If there's a line along one edge, the corner it passes through
should be the pin 1 mark.
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Author: Jon SlaughterDate: 15:00 07-04-08
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Author: Jon SlaughterDate: 15:00 07-04-08
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"DJ Delorie" <dj@delorie.com> wrote in message
news:xntzidh695.fsf@delorie.com...
>
> "Jon Slaughter" <Jon_Slaughter@Hotmail.com> writes:
>> SOIC but not sure why that matters
>
> Did you read the spec? The package drawing shows the beveled edge
> being on the pin 1 side.
> http://focus.ti.com/lit/ds/symlink/tmp275.pdf
Oh, its suppose to be more beleved than the others? hmm... so why does the
2nd page show a dot where pin one is but on the ic there is no dot?
Your right though, one side of the ic is more beveled than the other. This
is a strange way of getting across which pin is #1... specially when it
shows a dot and says "Note: Pin 1 is determined by orienting the package as
indicated in the diagram" and the diagram only uses a dot(no bevels). I did
look at the eng. drawing but didn't notice the bevel being any more than the
others. (when looking down on the package they all look about the same to
me.
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Author: Peter BennettDate: 22:09 07-04-08
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On Mon, 7 Apr 2008 12:22:57 -0600, "Jon Slaughter"
<Jon_Slaughter@Hotmail.com> wrote:
>
>"Jon Slaughter" <Jon_Slaughter@Hotmail.com> wrote in message
>news:NwsKj.482$%41.204@nlpi064.nbdc.sbc.com...
>> How the heck do you determine the first pin when there is no notch or any
>> special char or anything at all except a line and text? Does the line on
>> the side indicate the top? On the datasheet it shows the normal dot where
>> the first pin is but there is no dot on the chip itself ;/
>>
>>
>>
>
>BTW, the chip is the TMP275. It has a long line at the top or bottom(not on
>pins sides) and some text.
>
>
> * * * *
>| TI TMP275
>| etc
>|
> * * * *
>
>the | is the line and * are the pins
>
On any DIP-like package I've seen, pin 1 is at the bottom left if you
hold the package so the text is readable.
If you look at the "D" package drawing on page 15 of the datasheet,
you will see that the pin 1 - 4 edge has a 45 degree bevel, while the
pin 5 - 8 side doesn't - this is also a common convention on many
packages.
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca
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Author: Michael A. TerrellDate: 22:22 07-04-08
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Jon Slaughter wrote:
>
> "DJ Delorie" <dj@delorie.com> wrote in message
> news:xntzidh695.fsf@delorie.com...
> >
> > "Jon Slaughter" <Jon_Slaughter@Hotmail.com> writes:
> >> SOIC but not sure why that matters
> >
> > Did you read the spec? The package drawing shows the beveled edge
> > being on the pin 1 side.
> > http://focus.ti.com/lit/ds/symlink/tmp275.pdf
>
> Oh, its suppose to be more beleved than the others? hmm... so why does the
> 2nd page show a dot where pin one is but on the ic there is no dot?
>
> Your right though, one side of the ic is more beveled than the other. This
> is a strange way of getting across which pin is #1... specially when it
> shows a dot and says "Note: Pin 1 is determined by orienting the package as
> indicated in the diagram" and the diagram only uses a dot(no bevels). I did
> look at the eng. drawing but didn't notice the bevel being any more than the
> others. (when looking down on the package they all look about the same to
> me.
It has been in use for a long time for surface mount packages. That
was why I was asking what package it was in. Page 15 clearly shows the
pinout, and you will see this on a lot of surface mount ICs.
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