MOTOROLA MVME134 Serial Link Controller

The magnitude of the trailing current pulse shall be less than four microamperes when the applied HBM stress voltage is at 4000 volts. This includes both positive and negative polarities. (See Figures 6 and 7 for sample waveforms). A circuit for measuring the trailing current pulse is shown in Figure 5. The voltage probe shall have input impedance no less than 10 megohm, an input capacitance no larger than 10 picofarad, a bandwidth better than 1 megahertz, and a voltage rating to withstand at least 100 volts. The evaluation load resistance is 10 kilohm in value with tolerance of + 1% and can withstand up to 4000 volts. The Zener diode has a breakdown voltage range from 6 to 15 volts and a power rating from ¼ to 1 watt.

Optional Pre-Pulse Voltage Rise Test Equipment 

HBM events may exhibit a phenomenon which generates a voltage rise at the stressed pin prior to the main HBM current pulse if the pin impedance is high. In some ESD simulators this phenomenon is unrealistically severe and may lead to inconsistent ESD threshold results. The characteristics of this pre-current pulse voltage event depend on the conditions and the environment of the arcing associated with the HBM discharge, the parasitic capacitances of the tester, as well as the pin impedance of the device under test. To determine the magnitude of the resulting voltage rise the following test equipment and apparatus is required. (See Figure 8 for measurement setup).

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