Power on reset circuits
AssigneeCypress Semiconductor Corporation
InventorsSean Smith, James Lutley, Jonathan Churchill
Life of this patent
Estimating the term…
Abstract
In one embodiment, a power on reset circuit includes a main circuit and a translation circuit. The main circuit may be configured to receive an external signal and to generate an input signal that is indicative of a state of the external signal. The translation circuit may be configured to receive the input signal and provide a power on reset signal indicative of a brownout condition of the external signal. The external signal may be a relatively high voltage signal compared to the power on reset signal.
Claims20
A power on reset circuit in an integrated circuit, the power on reset circuit comprising:
- a main circuit configured to receive an external voltage externally provided to the integrated circuit, the external voltage having a voltage range that is not suitable for use by an internal circuit in the integrated circuit, the main circuit being configured to generate an input signal indicative of a state of the external voltage;
- and
- a translation circuit configured to receive the input signal, the external voltage, and an internal power supply voltage for powering the internal circuit, the translation circuit being configured to assert a power on reset signal suitable for use by the internal circuit in an event of a brownout condition.
An integrated circuit comprising:
- a first circuit configured to receive an external signal externally provided to the integrated circuit and an input signal indicative of a brown out condition of the external signal, the first circuit being configured to provide an output signal based on a voltage level of the input signal and a voltage level of the external signal;
- and
- a second circuit configured to receive the output signal and to generate a power on reset signal during a brown out of the external signal, the second circuit being powered by an internal power supply voltage.
A method of providing a power on reset signal in an integrated circuit, the method comprising:
- receiving an external signal in an integrated circuit, the external signal having a voltage range that is not suitable for use by an internal circuit in the integrated circuit;
- generating an input signal indicative of a brownout condition of the external signal;
- and
- using the external signal and an internal power supply voltage to translate the input signal and generate a power on reset signal having a voltage range suitable for use by the internal circuit.
Dependencies are inferred from the claim text.