MOS output driver, and circuit and method of controlling same

摘要

A circuit and method for providing a fast transitioning output buffer that may be configured to operate using either a 3 volt or 5 volt supply voltage. The pullup behaves similarly to a MOS diode, but the circuit lowers the gate voltage on a pullup while the output is being pulled up. The circuit does not affect the final pullup voltage. As a result, a single PMOS device may be used as a pullup device that does not generally require an increased size to support a high operating voltage.