Dual-Voltage Detector Having Disable Outputs Within Separate Voltage Domain and Related Methods

摘要

Dual-voltage detectors and related methods are disclosed that receive control signals from a first supply voltage domain and provide multiple disable outputs within a separate supply voltage domain. The disclosed embodiments detect a power supply status in one supply voltage domain (e.g., 1.2 volts, ground) and then assert low voltage disable or reset signals to downstream circuitry within a different supply voltage domain that is powered with different supply voltages (e.g., 1.8 volts, 0.9 volts, ground). In certain embodiments, the dual-voltage detectors provide two disable signals to stacked output drivers that are used to tri-state the stacked output drivers to place them in a high-impedance (HIGH-Z) state, for example, during power-up or power-down operations.

主权项

1. A dual-voltage detector, comprising:
a control input configured to receive a control signal from a first voltage domain, the control signal indicating whether or not a supply voltage for the first voltage domain is stable; and a plurality of disable outputs configured to have one voltage level if the control signal indicates that the supply voltage is stable and a different voltage level if the control signal indicates that the supply voltage is not stable, the voltage levels for the plurality of disable outputs being in a second voltage domain.