Input-output (I/O) circuit supporting multiple I/O logic-level swings
    1.
    发明授权
    Input-output (I/O) circuit supporting multiple I/O logic-level swings 有权
    输入输出(I / O)电路支持多个I / O逻辑电平摆幅

    公开(公告)号:US08179160B1

    公开(公告)日:2012-05-15

    申请号:US12970944

    申请日:2010-12-17

    IPC分类号: H03K19/0175 H03K19/094

    摘要: An integrated circuit (IC) includes an input/output (I/O) circuit supporting high-speed operation and multiple I/O logic-level swings. The I/O circuit includes a first output signal chain to generate outputs with a first logic level swing, and a second output signal chain to generate outputs with a second logic level swing. The outputs of the first output signal chain and the second output signal chain are connected to a same output pad of the IC. Transistors in the first output signal chain and the second output signal chain are fabricated using corresponding gate oxide characteristics. The second output signal chain includes protection circuitry to prevent transistors in the second output signal chain from being subjected to voltage stresses beyond a safe limit. An input circuit in the I/O circuit similarly includes multiple input signal chains to enable reception of input signals of different logic-level swings from a same input pad.

    摘要翻译: 集成电路(IC)包括支持高速操作和多个I / O逻辑电平摆幅的输入/输出(I / O)电路。 I / O电路包括用于产生具有第一逻辑电平摆幅的输出的第一输出信号链和产生具有第二逻辑电平摆幅的输出的第二输出信号链。 第一输出信号链和第二输出信号链的输出连接到IC的相同输出焊盘。 使用对应的栅极氧化物特性制造第一输出信号链和第二输出信号链中的晶体管。 第二输出信号链包括保护电路,以防止第二输出信号链中的晶体管经受超过安全极限的电压应力。 I / O电路中的输入电路类似地包括多个输入信号链,以便能够从相同的输入焊盘接收不同逻辑电平摆幅的输入信号。