Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1993-06-18
1996-07-09
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327108, 327170, 327321, 326 30, H03K 19092, H03K 500
Patent
active
055348114
ABSTRACT:
An I/O bus interface cell includes a driver circuit having an input terminal fed by a logic signal and an output terminal to produce in response thereto a drive signal having selectable rise and fall time characteristics in accordance with a reference voltage provided to the driver. The I/O cell also includes a receiver circuit having an input terminal coupled to said output terminal of said driver with the receiver disposed to latch an unresolved, unamplified received signal prior to resolving the state of the signal. The I/O cell further includes a termination circuit having a terminal connected to the output of said driver, and having a selectable impedance characteristic at said terminal, with said selectable impedance being in accordance with a reference voltage provided to an input of said termination circuit. Preferably, the I/O cell the driver, receiver and termination circuits are fabricated on a common semiconductor substrate.
REFERENCES:
patent: 4920339 (1990-04-01), Friend et al.
patent: 5027008 (1991-06-01), Runaldue
patent: 5029284 (1991-07-01), Feldbanmer et al.
patent: 5066875 (1991-11-01), Veno et al.
patent: 5140192 (1992-08-01), Nogle
patent: 5166561 (1992-11-01), Okura
patent: 5237395 (1993-08-01), Lee
patent: 5291071 (1994-03-01), Allen et al.
patent: 5296765 (1994-03-01), Williams et al.
Coyle Joseph P.
Gist William B.
Callahan Timothy P.
Casey Mark J.
Digital Equipment Corporation
Fisher Arthur W.
Le Dinh T.
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