Electronic digital logic circuitry – Interface – Current driving
Patent
1994-12-21
1996-05-07
Westin, Edward P.
Electronic digital logic circuitry
Interface
Current driving
326 30, 327541, H03K 190175
Patent
active
055149839
ABSTRACT:
The data input/output circuit for full duplex communication includes a data accepting and sending circuit which has an input/output terminal connected to a processor provided within a digital apparatus, and which receives data from the processor, transmits the data and receives outside data through the input/output terminal, a reference circuit which divides a voltage level of the data transmitted from the data accepting and sending circuit and produces a divided voltage level, a differential receiving circuit which has one input terminal connected to the input/output terminal and another input terminal connected to the reference circuit, and which is not operated by a zero voltage difference between the input terminals when the data is transmitted from the input/output terminal but operated by a voltage difference between the input terminals when the data is received through the input/output terminal, the data being supplied to the processor of the digital apparatus, a reference circuit for generating an output impedance value of the data accepting and sending circuit, and a voltage regulation circuit for adjusting a power supply voltage to be applied to the data accepting and sending circuit so that the output impedance value is changed in accordance with the value of the output impedance. This data input/output circuit can be incorporated in an LSI of CMOS transistor structure and has a simple circuit arrangement capable of impedance matching with the transmission path.
REFERENCES:
patent: 4797582 (1989-01-01), Nguyen
patent: 5084637 (1992-01-01), Gregor
patent: 5248906 (1993-09-01), Mahmood
patent: 5371424 (1994-12-01), Quigley
"Simultaneous Bidirectional Signalling or IC Systems", ICCD Thesis in 1990, Lam et al, pp. 430-433.
Hitachi , Ltd.
Sanders Andrew
Westin Edward P.
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