MOTOROLA MVME134FP Output logic module

The worst-case condition will be measured for a low capacitance Zener diode with a voltage in the 8 to 10 volt range. The Zener diode will provide protection for the voltage probe and its low capacitance will not reduce the voltage buildup appreciably. The current transducer on the groundside of the diode is used to trigger an oscilloscope. The voltage probe, connected to a second channel of the oscilloscope, should have high resistance such as a 10 megohm 10X probe. Sample data is shown in Figure 9 for a 9.4 volt Zener diode. The HBM current pulse occurs at time zero and cannot be seen at this time scale. At the time scale of an HBM event, tens to hundreds of nanoseconds, the voltage before the HBM current pulse would appear as a DC voltage across the diode. To measure the voltage across a device the Zener diode is replaced by the device of interest.

Open-Relay Tester Capacitance Parasitics 

The HBM stressing of a single supply pin is complicated when the pin is part of a group of multiple like-name supply pins (balls) that are shorted together via the DUT (e.g., via a package plane). When the component is placed in the socket only one pin can be connected to Terminal A. The other supply pins are left “floating” as the HBM simulator’s connect relays are opened so the other supply pins do not connect to Terminal A or B. Recent HBM tester research on package-plane-shorted pins has found that when a single pin is stressed, the other “floating” supply pins act like small capacitors. Since the relays are open, no DC current will flow to ground, but the open-relay capacitors will charge.

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