| 摘要 |
A bus holder includes a first inverter, a second inverter and a pass switch. The first inverter is coupled between a first power supply voltage node and a second power supply voltage node, and receives an input signal via an input terminal to output a first output signal having an inverted phase with respect to the input signal. The second inverter is coupled between the first power supply voltage node and the second power supply voltage node, and inverts the first output signal to output a second output signal, having an inverted phase with respect to the first output signal, to an output terminal. The pass switch is coupled between the input terminal and the output terminal, and outputs a signal having a level of a control voltage to the input terminal, in response to the control voltage. Accordingly, a tolerant input/output buffer may stably maintain an input signal level when a bus is floated.
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