Patents Represented by Attorney Keeneth E. Leeds

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  • TTL/CMOS compatible input buffer with Schmitt trigger
    Patent number: RE34808
    Abstract: A TTL/CMOS compatible input buffer circuit comprises a Schmitt trigger input buffer stage and a reference voltage generator. In the TTL mode, the reference voltage generator supplies a reference voltage having a level that forces the trigger point of the Schmitt trigger to a predetermined value. In the CMOS mode, the reference voltage generator is disabled and a voltage equal to the power supply voltage is provided to the Schmitt trigger. The input buffer circuit affords an enhanced input noise margin and minimizes DC power loss.
    Type: Grant
    Filed: November 8, 1990
    Date of Patent: December 20, 1994
    Assignee: Xilinx, Inc.
    Inventor: Hung-Cheng Hsieh