Method to achieve true fail safe compliance and ultra low pin current during power-up sequencing for mobile interfaces

摘要

An input/output (IO) circuit powered by an input/output (IO) supply voltage. The IO circuit includes a supply detector cell that detects a core supply voltage and generates a supply detect signal. A driver circuit is connected to a PAD and the driver circuit receives the supply detect signal. A failsafe circuit receives a PAD voltage. The failsafe circuit and the supply detector cell controls a leakage current from the PAD based on the IO supply voltage and the PAD voltage.

主权项

1. An input/output (IO) circuit powered by an input/output (IO) supply voltage comprising:
a supply detector cell configured to detect a core supply voltage and generate a supply detect signal; a driver circuit connected to a PAD and configured to receive the supply detect signal; and a failsafe circuit configured to receive a PAD voltage, wherein the failsafe circuit and the supply detector cell are configured to control a leakage current from the PAD based on the IO supply voltage and the PAD voltage.