| 摘要 |
Circuitry 400 for controlling a bidirectional terminal includes an output transistor 405 for selectively coupling the bidirectional terminal to a voltage rail, output transistor 405 turning on when a voltage at a control node falls below a preselected threshold voltage. A diode 402 is coupled to the control node and has a threshold voltage lower than the threshold voltage of the transistor for maintaining the output transistor in a substantially turned off state by maintaining the voltage at the control node above the VDD-VT, where VDD is the supply voltage and VT is the threshold voltage of transistor 405.
|
