Input Threshold Voltage

In digital logic, 1 and 0 are determined according to the magnitude of the input voltage of the signal line. It means, if the voltage of the input signal is higher than Vih_min, it is regarded as 1. And if the voltage of the input signal is lower than Vil_max, it is regarded as 0. If the voltage of the input signal is between Vi and Vh, the operation is unpredictable.

Figure 1.

• Item: Input item name.
• Component Group: Select a target component group to be tested.
• Input Pin: Select pin type of input pin to be tested.
• Power Pin: Select pin type of input pin to be tested. (Pin name string or Pin Type)
• Voh: Set the output high voltage (Voh) of driver pin. You can set this by entering the value directly or select the property name which contain voh value.
• Vol: Set the output low voltage (Vol) of driver pin. You can set this by entering the value directly or select the property name which contain vol value.
• Threshold: Set the input threshold of input signal and allowable value of input power signal. Double-clicking empty field, the Threshold dialog will be displayed.

  
  
  Figure 2.

• Comp Group: Select target component to be checked.
• Type: Select measure type. (Value/VDD Factor)
  • Value: the numbers in Vil_max and Vih_Min mean voltage value.
  • VDD Factor: the numbers in Vil_max and Vih_Min are multiples of VDD.
• VDD(Min)(V):
• VDD(Max)(V):
• Vil_Max:
• Vih_Min:

If the operating voltage of the IC is used at 3.3V and 5V, the 3.3V and 5V tables can be set up respectively.

• Test Option: Set whether passive components are considered short or open when navigating signals and power lines. Upon double-clicking the empty field, the Test Option dialog will be displayed.

  
  
  Figure 3.

Power Composite Component Section: In this section, we declare the component to be processed short and the component to be opened during power trace navigation. Since Stress Test is a DC level test, the capacitor is considered as open and inductor is considered as short. And normally the resistor is considered as open, because the current of power net is so big that the IR-Drop can’t be ignored.

• Short Component: Select the component group to be processed short during power trace navigation.
• Open Component: Select the component group to be processed open during power trace navigation.

  
  
  Figure 4.

Signal Composite Component Section: In this section, we declare the component to be processed short and the component to be opened during signal trace navigation. Since Stress Test is a DC level test, the capacitor is considered as open and inductor is considered as short. And normally the resistor is considered as short, because the current of signal net is so small that the IR-Drop can be ignored.

• Short Component: Select the component group to be processed short during signal trace navigation.
• Open Component: Select the component group to be processed open during signal trace navigation.

  
  
  Figure 5.

Connector Voh/Vol Section: Normally a connector component has no property information. In case of stress test including connector, parameter for connector pin is needed. In this section, we can declare the voh and vol value of each connector pins manually.

• Comp Group: Select connector component group.
• Pin Number: Enter pin number of connector component.
• Voh: Enter Voh value of specific pin.
• Vol: Enter Vol value of specific pin.

Figure 6.