[SI-LIST] Re: Buffer Drive Strength

You can get a good comparison but you will not be able to determine if it is a 
2mA, 8mA, etc.  The current rating of a buffer tells the user that at a given 
current the output voltage will not exceed the specified voltage.  In my 
experience a part will be much stronger than the rating suggests in most cases. 
 For example a 2 mA buffer with a Vol of 0.4 Volts may actually have the 
ability to sink 12mA at 0.4 volts, nominal Vcc and room temperature.

Other examples I have seen from the same part
rating       measured
4mA           27mA
8mA           32mA
8mA           44mA
12mA          46mA
24mA          71mA
48mA         130mA


Tom Dagostino
Modeling Manager
Mentor Graphics Corp.
SAS
tom_dagostino@xxxxxxxxxx
503-685-1613


-----Original Message-----
From: Ken Patterson [mailto:pattken@xxxxxxxxxxxxxxxxxx]
Sent: Wednesday, January 30, 2002 11:27 AM
To: Si-List@Freelists. Org
Subject: [SI-LIST] Buffer Drive Strength



Is there an easy way to determine I/O buffer drive strength from looking at
an IBIS model??

Ken Patterson
Senior Hardware Engineer
Laurel Networks, Inc
Omega Corporate Center
1300 Omega Drive
Pittsburgh PA, 15205
PH: (412)809-4200 ext. 4223
email: pattken@xxxxxxxxxxxxxxxxxx

Visit Laurel Networks at www.laurelnetworks.com

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