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公开(公告)号：DE69523547D1
公开(公告)日：2001-12-06
申请号：DE69523547
申请日：1995-11-28
Applicant: ST MICROELECTRONICS INC
Inventor： MCCLURE DAVID C
Abstract: An output driver circuit for an integrated circuit is disclosed, where the output driver drives an output terminal with a high logic level having a voltage limited from the power supply voltage of the integrated circuit. The limited voltage is provided by applying a limited output high voltage to an output buffer, such that the drive signal applied to the gate of the pull-up transistor in the output driver is limited by the limited output high voltage applied to the output buffer. A voltage reference and regulator circuit for generating the limited output high voltage is also disclosed, and is based on a current mirror. The sum of the current in the current mirror is controlled by a bias current source, which may be dynamically controlled within the operating cycle or programmed by way of fuses. An offset compensating current source adds current into the reference leg of the current mirror to eliminate the development of an offset voltage in the current mirror, and the limited output high voltage is shifted by the threshold voltage of the pull-up drive transistor by way of a threshold shift circuit.
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公开(公告)号：DE69521484D1
公开(公告)日：2001-08-02
申请号：DE69521484
申请日：1995-11-28
Applicant: ST MICROELECTRONICS INC
Inventor： MCCLURE DAVID C
Abstract: An output driver circuit for an integrated circuit is disclosed, where the output driver drives an output terminal with a high logic level having a voltage limited from the power supply voltage of the integrated circuit. The limited voltage is provided by applying a limited output high voltage to an output buffer, such that the drive signal applied to the gate of the pull-up transistor in the output driver is limited by the limited output high voltage applied to the output buffer. A voltage reference and regulator circuit for generating the limited output high voltage is also disclosed, and is based on a current mirror. The sum of the current in the current mirror is controlled by a bias current source, which may be dynamically controlled within the operating cycle or programmed by way of fuses. An offset compensating current source adds current into the reference leg of the current mirror to eliminate the development of an offset voltage in the current mirror, and the limited output high voltage is shifted by the threshold voltage of the pull-up drive transistor by way of a threshold shift circuit.
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公开(公告)号：DE69518616D1
公开(公告)日：2000-10-05
申请号：DE69518616
申请日：1995-11-28
Applicant: ST MICROELECTRONICS INC
Inventor： MCCLURE DAVID C
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公开(公告)号：DE69515621D1
公开(公告)日：2000-04-20
申请号：DE69515621
申请日：1995-11-28
Applicant: ST MICROELECTRONICS INC
Inventor： MCCLURE DAVID C
IPC: G05F3/26 , H03K19/0185 , H03K19/00
Abstract: An output driver circuit for an integrated circuit is disclosed, where the output driver (20) drives an output terminal with a high logic level having a voltage limited from the power supply voltage of the integrated circuit. The limited voltage is provided by applying a limited output high voltage to an output buffer (21), such that the drive signal applied to the gate of the pull-up transistor (32) in the output driver (20) is limited by the limited output high voltage applied to the output buffer (21). A voltage reference and regulator circuit (24) for generating the limited output high voltage is also disclosed, and is based on a current mirror. The sum of the current in the current mirror is controlled by a bias current source (26), which may be dynamically controlled within the operating cycle or programmed by way of fuses. An offset compensating current source (28) adds current into the reference leg of the current mirror to eliminate the development of an offset voltage in the current mirror, and the limited output high voltage is shifted by the threshold voltage of the pull-up drive transistor (32) by way of a threshold shift circuit (30).
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