A 64×64 ultra-high-speed digital readout integrated circuit (DROIC) with an on-chip integrated memory is designed for infrared focal plane signal readout. By bonding the DROIC with a mid-wave infrared focal plane array detector, an ultra-high-speed mid-wave infrared image sensor is developed. Experimental results demonstrate that the developed infrared image sensor achieves a frame rate of 1 MHz and a record length of 100 frame, with approximately linear response to blackbody temperature and a temperature resolution better than 3.6 K.