An image sensor device includes a pixel array, including digital pixels, and a pixel driver including a high-speed scanner that generates reset enable signals and signal enable signals. Each of the digital pixels includes a photo detector, a comparator, and a memory circuit. The high-speed scanner includes a first flip-flop and a second flip-flop. The first flip-flop receives a clock signal and a read trigger signal and outputs a first reset enable signal of the reset enable signals. The second flip-flop receives the clock signal and the first reset enable signal and outputs a first signal enable signal of the signal enable signals. The pixel array outputs a reset sampling value stored in the memory circuit in response to the first reset enable signal and outputs a signal sampling value stored in the memory circuit in response to the first signal enable signal.