A pixel cell has a photodiode, a transfer transistor, a reset transistor, an amplifier transistor in a common source configuration and a readout circuit block. The photodiode, transfer transistor, reset transistor and common source amplifier are disposed within a first substrate of a first semiconductor chip for accumulating an image charge in response to light incident upon the photodiode. The readout circuit block may be partially disposed within a second substrate of a second semiconductor chip and partially disposed within the first substrate wherein the readout circuit block comprises optionally selectable rolling shutter and global shutter readout modes through the use of computer programmable digital register settings. The global shutter readout mode provides in-pixel correlated double sampling.