Re: [SI-LIST] : Edge Rates

Dr. Edward P. Sayre ([email protected])
Fri, 09 Jul 1999 09:09:46 -0400

It has been an interesting set of developments over the last two years.
Before we had one or two SI problems in a design, now every trace has the
potential for SI problems.

ed
======
At 02:47 PM 7/8/99 -0700, you wrote:
>I concur with Tom. It is highly unusual to see
>a device these days that has an edge rate more
>than 500 ps. This means that almost every pc
>board trace must be considered a transmission line for
>analysis purpose. Most devices manufactured today
>also tend to have lower channel resistance than
>necessary (10 to 25 ohms), which will cause severe
>overshoot and ringback on unterminated nets.
>
>BTW, Tom also gives a great presentation with
>a breakdown of the measured edgerate characteristics
>of various devices.
>
>regards,
>
>scott
>
>
>tomda wrote:
>
>> Assume 100 to 500 psec for the full transition for any modern logic family
>> unless it has controlled edge rates.
>>
>> Tom Dagostino
>>
>> -----Original Message-----
>> From: Ken Patterson [SMTP:[email protected]]
>> Sent: Thursday, July 08, 1999 12:07 PM
>> To: [email protected]
>> Subject: [SI-LIST] : Edge Rates
>>
>> I am a newcomer to signal integrity analysis and would like to know how
>> to find out what the typical edge rates (i.e. rise and fall times) of
>> some of the industry standard logic families are. These include FCT
>> logic, SDRAMs and Syncburst SRAMs . I have an upcoming project that
>> will use these devices and would loike to perform some signal integrity
>> analysis.
>>
>> Ken Patterson
>> Electronic Engineer
>> ADC Broadband Communications/Pathway Division
>> email:[email protected]
>>
>> **** To unsubscribe from si-list: send e-mail to
>> [email protected]. In the BODY of message put: UNSUBSCRIBE
>> si-list, for more help, put HELP. si-list archives are accessible at
>> http://www.qsl.net/wb6tpu/si-list ****
>>
>> **** To unsubscribe from si-list: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list, for more help, put HELP. si-list archives are accessible at
http://www.qsl.net/wb6tpu/si-list ****
>
>
>**** To unsubscribe from si-list: send e-mail to
[email protected]. In the BODY of message put: UNSUBSCRIBE
si-list, for more help, put HELP. si-list archives are accessible at
http://www.qsl.net/wb6tpu/si-list ****
>
>

+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
| NORTH EAST SYSTEMS ASSOCIATES, INC. |
| ------------------------------------- |
| "High Performance Engineering & Design" |
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+
| Dr. Ed Sayre e-mail: [email protected] |
| NESA, Inc. http://www.nesa.com/ |
| 636 Great Road Tel +1.978.897-8787 |
| Stow, MA 01775 USA Fax +1.978.897-5359 |
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+

**** To unsubscribe from si-list: send e-mail to [email protected]. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****