INSTANTANEOUS TEST MODE DESIGNATION CIRCUIT

摘要

The designated circuit comprises a level detection part for detecting the level of input signal (VIN); a schmitt trigger circuit part for outputting a clock signal (CK) and stablizing the detected level from the detection part; a toggle for outputting a test enable signal (TESTEN) controlled by the clock signal (CK); and a latch circuit. The level detection part provides output in case the level of input signal (VIN) is less than the designated ground level.