REFERENCE VOLTAGE CIRCUITS AND ON-DIE TERMINATION CIRCUITS, METHODS FOR UPDATING THE SAME, AND METHODS FOR TRACKING SUPPLY, TEMPERATURE, AND/OR PROCESS VARIATION

摘要

Devices and methods for operating devices are provided, such as those that include a memory device having a reference voltage (Vref) circuit that has substantially similar paths and impedances as an on-die termination (ODT) circuit. One such Vref circuit tracks supply variations and temperature changes in a manner substantially similar to the ODT circuit. In some embodiments an update scheme is provide for the ODT circuit and the Vref circuit to enable simultaneous update of each circuit through the same digital codes.