Input/output capacitance measurement, and related methods, devices, and systems

A method, comprising:

• charging an input/output (I/O) node to a voltage level substantially equal to an operating voltage, the operating voltage being greater than a reference voltage;
• coupling the I/O node to a ground voltage to generate a current through the I/O node;
• in response to coupling the I/O node to the ground voltage, comparing, beginning during a first clock cycle of a clock signal and for each clock cycle of a number of clock cycles of the clock signal, the voltage of the I/O node to the reference voltage to generate a result;
• detecting, upon completions of a subsequent clock cycle of the clock signal, a change in the result;
• determining, in response to detecting the change in the result, a transition time based on a number of elapsed clock cycles from the first clock cycle to completion of the subsequent clock cycle;
• and
• determining a capacitance of the I/O node based on the transition time.

A system comprising:

• at least one input device;
• at least one output device;
• at least one processor device operably coupled to the input device and the output device;
• and
• at least one memory device operably coupled to the at least one processor device and comprising:
• an input/output (I/O) node configured to be selectively coupled to an operating voltage;
• a current source coupled to the I/O node and configured to, during a first clock cycle of a number of clock cycles of a clock signal, couple the I/O node to a ground voltage to generate an I/O current;
• and
• a comparator coupled to the I/O node and a reference voltage and configured to generate a comparison result;
• and
• a controller configured to:
• detect a change in the comparison result during a subsequent clock cycle of the number of clock cycles of the clock signal;
• and
• determine a capacitance of the I/O node based on a number of elapsed clock cycles from the first clock cycle to completion of the subsequent clock cycle and a frequency of the clock signal.