Controlling voltage at pad

摘要

One or more systems and techniques for communicating a signal between a first chip and a second chip using one or more circuits are provided. If the signal corresponds to a first voltage, one or more voltages are provided to one or more locations and a capacitive load is charged using a pull-up driver that is connected to a power supply. If the signal corresponds to a second voltage, one or more voltages are provided to one or more locations and the capacitive load is discharged using a pull-down driver that is connected to ground. When the first chip is powered off, a fail-safe mode is provided by configuring a cross control circuit to generate a bias to control one or more transistors.

主权项

1. A method for applying a first voltage at a pad, comprising:
activating a pull-up driver situated between a power supply outputting the first voltage and a node to pull the node to a second voltage, the second voltage less than the first voltage by about a voltage threshold of the pull-up driver; triggering, responsive to the node being pulled to the second voltage, a cross control circuit to activate one or more transistors situated between the pull-up driver and the pad, comprising:
applying the first voltage to a first gate of a first transistor of the one or more transistors; and pulling the pad to the first voltage responsive to activating the one or more transistors situated between the pull-up driver and the pad.