Random pulse generator and memory

A memory comprising:

• a memory core including memory cells that are arranged in rows and columns;
• a randomness test circuit suitable for testing randomness of a random pulse;
• a control circuit suitable for generating frequency control information and pulse control information according to a test result of the randomness test circuit;
• a periodic wave generating circuit suitable for generating a periodic wave whose frequency is changed based on the frequency control information;
• a pulse generating circuit suitable for generating the random pulse based on the periodic wave and the pulse control information;
• and
• a random sampling circuit suitable for randomly sampling, based on the random pulse, a part of the rows on which an active operation is performed.

An operating method of a random pulse generating circuit, the operating method comprising:

• generating one or more preliminary pulses according to a periodic signal and a first part of a control code;
• generating a random pulse from the preliminary pulses according to a second part of the control code;
• testing randomness of the random pulse to generate a test result;
• and
• adjusting, according to the test result, a period of the periodic signal and the control signal.