Apparatuses, systems, and methods for dynamic self-refresh rate in volatile memory

A system comprising:

• a command/address (CA) bus;
• a memory controller configured to provide a self-refresh exit command via the CA bus at a first time and a self-refresh entry command via the CA bus at a second time after the first time;
• and
• a memory configured to receive the self-refresh exit command and the self-refresh entry command via the CA bus and further configured to determine a self-refresh rate based on the determination of whether an auto-refresh command was received between the first time and the second time.

A method comprising:

• receiving, at a memory, a self-refresh exit command at a first time;
• receiving, at the memory, a self-refresh entry command at a second time after the first time;
• determining, by the memory, a self-refresh rate for a self-refresh mode based on a number of refresh operations performed between the first time and the second time;
• and
• performing, by the memory, self-refresh operations during the self-refresh mode according to the self-refresh rate.

A memory device comprising:

• a memory array including a plurality of memory cells;
• a temperature sensor configured to provide a temperature of the memory device;
• and
• a refresh control circuit configured to store a plurality of refresh rate curves, select a refresh rate curve from the plurality of refresh rate curves based on a number of refresh operations performed during a time period, and determine a refresh rate for refreshing the plurality of memory cells in the memory array in a self-refresh mode based on the temperature of the memory device and the selected refresh rate curve.