Bus switch integrated circuit with voltage translation

Details Bus switch integrated circuit with voltage translation Bus switch integrated circuit with voltage translation

1995-04-28

1998-05-12

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 86, 326 68, H03K 190175, H03K 19094

Patent

active

057511683

ABSTRACT:
A circuit and method for providing a bus switch that translates voltage from one level to a second, lower level. A FET bus switch transistor 310 is integrated on the same silicon chip 320 with one or more diodes 330 in series with Vcc, the power supply 340. A bias current source 350 is included to bias the diode. The diodes and current source are configured to provide additional voltage translation so that when a control input couples the input pin at the source of the FET bus switch to the output pin at the drain of the FET bus switch, the voltage at the output pin can be placed at a predetermined level. The bus switch thus acts as both a bus coupling device and a voltage translation device.

REFERENCES:
patent: 4626882 (1986-12-01), Cottrell et al.
patent: 5122691 (1992-06-01), Balakrishnan
patent: 5184198 (1993-02-01), Bartur
patent: 5376846 (1994-12-01), Houston
patent: 5408147 (1995-04-01), Yarbrough et al.
patent: 5414375 (1995-05-01), Tsuboi
patent: 5442304 (1995-08-01), Wong et al.
patent: 5502329 (1996-03-01), Pezzani

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