Genrad, Inc.

Jak Eskici

Anthony J Suto

Michael W Hamblin

Pin-driver circuitry in each of an automatic circuit tester (,)'s digital driver/sensor circuits (,) includes a current sensor (R,, QS,QS,D,and D,) and comparison circuit (,) that indicate whether the load current supplied by the driver exceeds a level set by a threshold input (CURRENT_VALUE). The pin-driver circuitry also includes a timer (,) whose output indicates whether the comparison circuit's output has been asserted for a length of time that exceeds a limit set by a duration input (TIME_VALUE). When it has, the tester disables the driver and thereby prevents damage that could otherwise result from excessive backdrive durations that the test-generation process did not anticipate. When no backdriving is sensed during a given burst of test signals, the tester forgoes the normal cool-down delay, thereby speeding the test process.

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Watertown, MA, United States of America

Jak Eskici