Programmable output buffer

Details Programmable output buffer Programmable output buffer

H - Electricity

01

L

356/30, 352/41

H01L 29/76 (2006.01) H01L 27/118 (2006.01) H03K 5/02 (2006.01)

Patent

CA 1196427

PROGRAMMABLE OUTPUT BUFFER Thomas J. Davies ABSTRACT A structure and method are provided wherein a single output buffer stage (50) is provided which can be programmed to function either as an open drain output buffer or a CMOS Push-Pull output buffer. The output buffer stage constructed in accordance with this invention is programmed in one of several manners. In one embodiment of this invention, the fabrication steps utilized to program the output buffer are the enhancement and depletion dopings, whereby certain devices of the output buffer are programmed to either remain always turned off or always turned on, thus programming the output buffer to serve either as an open drain output buffer or as a CMOS push-pull output buffer.

429765

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