Erase operation for memory device with staircase word line voltage during erase pulse

Abstract

Apparatuses and techniques are described for performing an erase operation for a set of memory cells, where the erase operation applies a staircase or multi-level word line voltage concurrent with a fixed level erase pulse to provide multiple channel-to-gate voltages. Current consumption and time are saved compared to applying a multi-level erase voltage to a high capacitance substrate, for example. In one approach, the word line voltage is changed from a positive erase-enable voltage to a negative erase-enable voltage during the multi-level erase pulse. A step size of a next erase pulse can be set to achieve an approximately constant step increase in channel-to-gate voltages of the memory cells.