Output buffer circuit changeable of the output signal from a low

Details Output buffer circuit changeable of the output signal from a low Output buffer circuit changeable of the output signal from a low

1994-02-28

1996-10-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327374, 326 57, H03K 19017, H03K 19094

Patent

active

055635393

ABSTRACT:
An output buffer circuit includes a pull-down side transistor connected between an output terminal and a low-potential power source. The pull-down side transistor is driven by an input signal, such that when the pull-down side transistor is turned on by the input signal, a low level output signal is output from the output terminal. A pull-up circuit is connected between the output terminal and a high-potential power source, for changing the output signal to a high level in accordance with the input signal when the transistor is turned off in response to the input signal. The pull-up circuit ceases to function when the output signal goes high thereby creating a high impedance condition. The pull-up circuit includes an OR gate which receives the input signal and the output signal, and an inverter which receives an output signal of the OR gate. A differentiating circuit is provided, through which an output signal of the inverter circuit is output to the output terminal.

REFERENCES:
patent: 4217502 (1980-08-01), Suzuki et al.
patent: 4449064 (1984-05-01), Eckert et al.
patent: 4486674 (1984-12-01), Neely
patent: 4529895 (1985-07-01), Garverick et al.
patent: 4818901 (1989-04-01), Young et al.
patent: 4839540 (1989-06-01), Ueno
patent: 4906867 (1990-03-01), Petty
patent: 5083048 (1992-01-01), Kashimura
patent: 5319260 (1994-06-01), Wanlass
patent: 5440182 (1995-08-01), Dobbelaere

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