semicon temp specs?

[Jim Thompson]

On Fri, 26 Aug 2005 08:14:57 GMT, Robert Baer
<robertbaer@earthlink.net> wrote:

martin griffith wrote:

been looking at a rf widgit
http://www.nvlsi.no/index.cfm?obj=product&act=display&pro=86#

But it is only spec'd to -20C. What are the chances that it will work
normally down to -40C ie in Canada and other chilly places.

and what happens to an ic working at low temps?


martin
Back in the "good old daze" of MIL-SPEC, many ICs and discretes were
also characterized and specified to work from -55C to 125C.
Most of those same parts these days have been discontinued - more
eXplicitly, the packages have been discontinued (Cerdip, Metal).
But (for the most part) the processes making those chips has not changed.
I have tested a number of the "plastic" (actually epoxy) parts to
180C, and have found no package problems.
And, except for band-gap voltage references (and parts that use
them), i have found no problems.
On the low temp side, i remember doing "quick" testing of analog
devices by using dry ice.
No problems.
Get some dry ice and test some parts.
If you want a bath to help thermal transfer, use acetone.

Plastic packages at high temperatures gradually degrade the silicon
the plastic is in contact with.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

Iterativeend skrev:

Its hard to say how a device would work at lower temperature than
specified and its not wise to do it either. I am sure the company can
test it at -40 deg and send you the data if you contact them.

It is spec'ed for -40C storage so I'd think nothing mechanical breaks
at that temperature.
The datasheet says the transciever is based on another chip and the
1Mbit version is spec'ed to work at -40C

I guess it could just be that at -40C the clock frequency for the
4Mbit data rate will be so far of it doesn't work?

-Lasse

 

[Jim Thompson]

On 26 Aug 2005 12:44:47 -0700, langwadt@ieee.org wrote:

Iterativeend skrev:

Its hard to say how a device would work at lower temperature than
specified and its not wise to do it either. I am sure the company can
test it at -40 deg and send you the data if you contact them.

It is spec'ed for -40C storage so I'd think nothing mechanical breaks
at that temperature.
The datasheet says the transciever is based on another chip and the
1Mbit version is spec'ed to work at -40C

I guess it could just be that at -40C the clock frequency for the
4Mbit data rate will be so far of it doesn't work?

-Lasse

*Generally* CMOS works BETTER/FASTER when cold.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

Jim Thompson skrev:

On 26 Aug 2005 12:44:47 -0700, langwadt@ieee.org wrote:


Iterativeend skrev:

Its hard to say how a device would work at lower temperature than
specified and its not wise to do it either. I am sure the company can
test it at -40 deg and send you the data if you contact them.

It is spec'ed for -40C storage so I'd think nothing mechanical breaks
at that temperature.
The datasheet says the transciever is based on another chip and the
1Mbit version is spec'ed to work at -40C

I guess it could just be that at -40C the clock frequency for the
4Mbit data rate will be so far of it doesn't work?

-Lasse

*Generally* CMOS works BETTER/FASTER when cold.

I know
But if one end of the RF link is at -40C the other end at +85C and the
link only work if the ends are with in say, +/-30ppm ...

-Lasse

 

[Jim Thompson]

On 26 Aug 2005 13:14:24 -0700, langwadt@ieee.org wrote:

Jim Thompson skrev:

On 26 Aug 2005 12:44:47 -0700, langwadt@ieee.org wrote:


Iterativeend skrev:

Its hard to say how a device would work at lower temperature than
specified and its not wise to do it either. I am sure the company can
test it at -40 deg and send you the data if you contact them.

It is spec'ed for -40C storage so I'd think nothing mechanical breaks
at that temperature.
The datasheet says the transciever is based on another chip and the
1Mbit version is spec'ed to work at -40C

I guess it could just be that at -40C the clock frequency for the
4Mbit data rate will be so far of it doesn't work?

-Lasse

*Generally* CMOS works BETTER/FASTER when cold.


I know
But if one end of the RF link is at -40C the other end at +85C and the
link only work if the ends are with in say, +/-30ppm ...

-Lasse

Makes a helluva poor design ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

 

[Richard Crowley]

langwadt wrote ...

But if one end of the RF link is at -40C the other end at
+85C and the link only work if the ends are with in say,
+/-30ppm ...

That would seem like a function of whatever frequency-
determining/sensitive elements, not particularly of the silicon.

 

Jim Thompson skrev:

On 26 Aug 2005 13:14:24 -0700, langwadt@ieee.org wrote:


Jim Thompson skrev:

On 26 Aug 2005 12:44:47 -0700, langwadt@ieee.org wrote:


Iterativeend skrev:

Its hard to say how a device would work at lower temperature than
specified and its not wise to do it either. I am sure the company can
test it at -40 deg and send you the data if you contact them.

It is spec'ed for -40C storage so I'd think nothing mechanical breaks
at that temperature.
The datasheet says the transciever is based on another chip and the
1Mbit version is spec'ed to work at -40C

I guess it could just be that at -40C the clock frequency for the
4Mbit data rate will be so far of it doesn't work?

-Lasse

*Generally* CMOS works BETTER/FASTER when cold.


I know
But if one end of the RF link is at -40C the other end at +85C and the
link only work if the ends are with in say, +/-30ppm ...

-Lasse

Makes a helluva poor design ;-)

maybe, the bluetooth spec is +/-20ppm that doesn't leave much for the
tempco
of the xtal

-Lasse