metron9

09-10-2006, 09:37 PM

When it comes to datasheets, I am trying to understand every detail as best as I can but sometimes an example of real data would help my understanding. Even though I can make it work without knowing it.

I am working with the Ramtron FM24C64. There is a formula to find the maximum restor to use for a two wire buss on page 3. (link to datasheet link.. and attached schematic showing formula)

www.datasheetcatalog.com/datasheets_pdf/F/M/2/4/FM24C64.shtml (http://www.datasheetcatalog.com/datasheets_pdf/F/M/2/4/FM24C64.shtml)

Reading the Table of data

The Table shows three sets of data MIN and MAX values

Are these three sets 4.5V 5V and 5.5V conditions?

tR= Input Rise Time

Cbuss = Capacitance of the buss

Questons

1. Is this correct interpretation?

2. How would one measure Cbus

Last question is Capacitance value for the formula, is it in Pf?

So Rmax=tR/Cbuss

at 5V tR=300 ns

If my buss capacitance was 100pF

300/100 = 3

So as you can see, I am lost on this minor detail.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔

Think outside the BOX!

I am working with the Ramtron FM24C64. There is a formula to find the maximum restor to use for a two wire buss on page 3. (link to datasheet link.. and attached schematic showing formula)

www.datasheetcatalog.com/datasheets_pdf/F/M/2/4/FM24C64.shtml (http://www.datasheetcatalog.com/datasheets_pdf/F/M/2/4/FM24C64.shtml)

Reading the Table of data

The Table shows three sets of data MIN and MAX values

Are these three sets 4.5V 5V and 5.5V conditions?

tR= Input Rise Time

Cbuss = Capacitance of the buss

Questons

1. Is this correct interpretation?

2. How would one measure Cbus

Last question is Capacitance value for the formula, is it in Pf?

So Rmax=tR/Cbuss

at 5V tR=300 ns

If my buss capacitance was 100pF

300/100 = 3

So as you can see, I am lost on this minor detail.

▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔

Think outside the BOX!