Three-level detector without standby current

Details Three-level detector without standby current Three-level detector without standby current

1998-02-06

1999-10-19

Tokar, Michael

Electronic digital logic circuitry

Tri-state

326 59, 326 31, H03K 1900

Patent

active

059695404

ABSTRACT:
A three-level detector is used to detect the state of a level input pertaining to a relatively-high level, a relatively-low level, or floating. The three-level detector comprises a first inverter, a second inverter, a decision logic circuit, a switching circuit, and a latch. The first inverter and the second inverter, whose inputs are connected to the level input, have a relatively-high threshold voltage and a relatively-low threshold voltage, respectively. The decision logic circuit generates a detected signal representing the state of the level input in response to outputs of the first and second inverters. Moreover, the switching circuit is connected between the level input and a reference level. The latch generates one control signal to regulate the state of the switching circuit. When the state of the level input pertains to either the relatively-high level or a relatively-low level, the switching circuit is turned off. The switching circuit is turned on when the state of the level input is floating.

REFERENCES:
patent: 5602493 (1997-02-01), Konishi et al.

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