Level shifting latch circuit
AssigneeApple Inc.
InventorsVIVEKANANDAN VENUGOPAL, RAJIV MITTAL, SAHIL KAPOOR, CHANDAN SHANTHARAJ
Life of this patent
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Abstract
An apparatus according to an example includes a first circuit configured to receive an input signal from a first voltage domain and perform level shifting and latching functions on the input signal. The apparatus includes a second circuit coupled to the first circuit and configured to receive the input signal from the first voltage domain at an input of the second circuit, perform level shifting on the input signal, and provide a level-shifted signal for a second voltage domain at an output of the second circuit.
Claims20
An apparatus, comprising:
- a first circuit configured to receive an input signal from a first voltage domain and perform a first level shifting function and a latching function on the input signal;
- and
- a second circuit coupled to the first circuit and configured to receive the input signal from the first voltage domain at an input of the second circuit, perform a second level shifting on the input signal, and provide a level-shifted signal for a second voltage domain at an output of the second circuit.
A level shifting latch circuit, comprising:
- a latch portion comprising a cross-coupled field-effect transistor (FET) structure for level shifting an input signal from a first domain to a second domain and a second FET structure for latching the input signal;
- and
- a bypass portion comprising a first set of two stages for level shifting and outputting the input signal when the input signal is a falling signal, and a second set of two stages for level shifting and outputting the input signal when the input signal is a rising signal.
A method, comprising:
- receiving, by a first circuit from a first voltage domain, an input signal;
- performing, by the first circuit, a first level shifting function and a latching function on the input signal;
- receiving, by a second circuit coupled to the first circuit, the input signal from the first voltage domain at an input of the second circuit;
- performing, by the second circuit, a second level shifting function on the input signal;
- and
- providing, by the second circuit, a level-shifted signal for a second voltage domain at an output of the second circuit.
Dependencies are inferred from the claim text.