Patent ID: 11875873
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. A circuit for multi-mode ZQ calibration, comprising:
a first group of pull-up drivers connected to a first external resistor that is coupled to a ground voltage at a first resistor input;
a first group of pull-down drivers connected to a second external resistor that is coupled to a supply voltage at a second resistor input;
a first comparator configured to:
compare a first one of a plurality of selectable voltages with a first ZQ pad voltage at the first resistor input to generate a first comparison output, and
compare a second one of the plurality of selectable voltages with a second ZQ pad voltage at the second resistor input to generate a second comparison output;

a logic pull-up code generator configured to generate a pull-up code to calibrate the first group of pull-up drivers based on the first comparison output; and
a logic pull-down code generator configured to generate a pull-down code to calibrate the first group of pull-down drivers based on the second comparison output.