Momentary test mode enabling circuit

Details Momentary test mode enabling circuit Momentary test mode enabling circuit

1992-07-15

1995-03-28

Wieder, Kenneth A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

327 77, 327206, G01R 104

Patent

active

054020638

ABSTRACT:
A momentary test mode enabling circuit capable of enabling the test mode using a negative pulse signal below the ground voltage level and of inputting normal operational inputs to the input pin even in the period of test mode, The circuit comprising a level detecting unit for detecting a level of an input signal being inputted to the input pin, a Schmitt trigger unit for stabilizing the level of the signal detected at the level detecting unit and outputting clock signals, and a toggle and latch section for outputting a test enabling signal upon the control of the clock signals from the Schmitt trigger unit. By use of the Schmitt trigger circuit, the input level detection signal is stabilized, thus increasing the noise margin and the test enabling and disabling operations may be easily carried out by the negative change of a momentary input signal.

REFERENCES:
patent: 4295062 (1981-10-01), Mihalich et al.
patent: 4301379 (1981-11-01), Reinert
patent: 4336495 (1982-06-01), Hapke
patent: 4471235 (1984-09-01), Sakhuja et al.
patent: 4727270 (1988-02-01), Payne
patent: 4733168 (1988-03-01), Blankenship et al.

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