A neuromorphic device includes a plurality of cell tiles, each of the plurality of cell tiles including a cell array including a plurality of memory cells storing weights of a neural network, a row driver connected to the plurality of memory cells through a plurality of row lines, and cell analog-digital converters (ADCs) connected to the plurality of memory cells through a plurality of column lines, and a controller configured to select, form the plurality of cell tiles, a plurality of valid cell tiles storing the weights, execute a neural network-based arithmetic operation based on the plurality of valid cell tiles, and redundantly store weights of a first layer among a plurality of layers included in the neural network in a plurality of first valid cell tiles that are divided into a plurality of first tile groups.