Input circuit

Details Input circuit Input circuit

2005-09-16

2008-08-19

Tan, Vibol (Department: 2819)

Electronic digital logic circuitry

Tri-state

C327S057000, C327S103000

Reexamination Certificate

active

07414434

ABSTRACT:
An input circuit is provided that can identify three states of an external signal without complicated voltage adjustment and that can reduce the power consumption in a standby state. The input circuit includes: four resistor elements serially provided between different fixed potentials; an input terminal connected to a connection point of two of the resistor elements; a switching transistor controlled to turn on and off by a voltage at a connection point of two of the resistor elements; a current supplying circuit outputting a supply current when the switching transistor is on and not outputting the supply current when the switching transistor is off; a constant voltage generating circuit receiving the supply current to output a constant voltage; a constant voltage output buffering circuit that brings its output into a high-impedance state when the switching transistor is off, and that receives the constant voltage to output a prescribed voltage to a connection point of two of the resistor elements when the switching transistor is on; a switching transistor controlled to turn on and off by a voltage between opposing ends of the resistor element; and a combinational circuit outputting identify signals based on combinations of on and off states of the two switching transistors.

REFERENCES:
patent: 5627488 (1997-05-01), Tanzawa et al.
patent: 5969557 (1999-10-01), Tanzawa et al.
patent: 6201434 (2001-03-01), Kanda et al.
patent: 6765417 (2004-07-01), Mallinson
patent: 7253676 (2007-08-01), Fukuda et al.
patent: 04-177913 (1992-06-01), None
patent: 06-104664 (1994-04-01), None
patent: 08-070242 (1996-03-01), None
patent: 2003-188929 (2003-07-01), None

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