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To define Derating Guidelines |
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To define Derating Guidelines |
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To define Derating Guidelines
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To define Derating Guidelines |
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To define Derating Guidelines |
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Use the following procedure to define derating guidelines.
To define derating guidelines
| 1. | Activate the Product tree view. |
| 2. | From the Modules menu, select Derating; the Open Guidelines dialog box opens. |
| 3. | Select a guideline and choose OK; the Derating list opens: |
| 4. | In the Derating list, make selections for family and item code; the list displays all existing derating parameters for each type. |
See the descriptions of available Derating parameters below:
Parameter |
Description |
|---|---|
VssSR (%) |
Supply voltage stress ratio in Analog devices |
VinSR (%) |
Input voltage stress ratio |
CoutSR (%) |
Output current stress ratio |
Fanout |
Fanout is a measure of the ability of a logic gate output, implemented electronically, to drive a number of inputs of other logic gates of the same type. In most designs, logic gates are connected together to form more complex circuits, and it is common for one logic gate output to be connected to several logic gate inputs |
Freq.(%) |
Frequency stress |
Tcase (°C) |
Case temperature (for passive components) |
CsrgSR(%) |
Surge current stress ratio |
VrevSR(%) |
Reverse voltage stress ratio |
PSR |
Power Stress Ratio |
VSR |
Voltage Stress Ratio |
| 5. | To modify a type’s parameter values, double-click on its row in the list; the Derating Value Definition dialog box opens. |
| 6. | To apply the parameter values to the specified type, check the Enable check box; to allow RAM Commander to ignore parameter values for the specified type, clear the Enable check box. |
| 7. | Enter values as required and choose OK. |
RAM Commander updates the guidelines with the new parameter values.
You can set parameter values for specific item code types. This is useful for specifying different derating curves for various component types.
To define derating curves by item code type
| 1 | Activate the Derating list. |
| 2 | From the Item menu, select Create or press F7; the Derating value definition dialog box opens. |
| 3 | Enter values as required and choose OK. |
RAM Commander applies these values to the type instead of those defined for the entire item code. Select Edit or Delete from the Item menu to modify or delete any record in the Derating list.
Many guidelines may be defined for one project. Use the following table to manage multiple guidelines.
To |
Select |
|---|---|
Create a new guideline |
New from the Guidelines menu |
Open another project guideline |
Open from the Guidelines menu |
Delete a guideline |
Delete from the Guidelines menu |
Copy a guideline |
Save As from the Guidelines menu |
In the dialog box, enter the name of the requested guideline and choose OK; RAM Commander updates the guideline listing.
Use the following procedure to make the derating data available to other RAM Commander users on the network.
To transfer project guidelines to global guidelines
| 1 | Close any open Derating lists, and activate the Product tree view. |
| 2 | From the Project menu, choose Transfer; the Transfer dialog box appears. |
| 3 | Select the Project to Global and Derating Definitions option buttons. |
| 4 | Choose OK. |
RAM Commander transfers the project’s derating data to the global library. All new projects will use this information.
A derating study may also be initialized or refreshed using the global settings. To do this, use the previous procedure, but switch Project and Global in step 3.