Interface circuit

Details Interface circuit Interface circuit

2011-07-26

2011-07-26

Crawford, Jason M (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

C326S027000, C326S086000, C327S109000, C327S198000, C365S189050, C365S230080

Reexamination Certificate

active

07986162

ABSTRACT:
An interface of the present invention includes a first inverter circuit that inverts a logic level of an input signal given to an external input terminal and outputs the inverted logic level, a second inverter circuit that outputs a potential in which a logic level of an output signal of the first inverter circuit is inverted, that is, a potential higher or lower than a logic of an input signal applied to the first inverter circuit by the amount of a predetermined potential, and a feedback path that positive feedbacks an output signal of the second inverter circuit to the external input terminal. The interface circuit of the invention positive-feedbacks a potential of the output signal of the second inverter circuit and shifts the potential of the external input terminal in a floating state to an H or L level potential.

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AN-5006J Designing With Bushold; Fairchild Semiconductor Corporation; Sep. 1999; pp. 1-3.
Japanese Office Action dated Oct. 27, 2006 and English translation thereof issued in a counterpart Japanese Application No. 2003-188027.

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