The CS pin indicates an active-low, chip-select signal. A rising edge on the CS signal outputs all the data lines in tri-state mode. This function allows multiple devices to share the same output data lines. The falling edge of the CS signal marks the beginning of the output data transfer frame in any interface mode of operation for the device. In the parallel and parallel byte interface modes both the CS and RD input pins must be driven low to enable the digital output bus for reading the conversion data (DB[15:0] for parallel and DB[7:0] for parallel byte interface). In serial mode, the falling edge of the CS signal takes the DOUTA, DOUTB serial data output lines out of tri-state mode and outputs the MSB of the previous conversion result.