The IDT74SSTUBF32869A includes a parity checking function. The IDT74SSTUBF32869A accepts a parity bit from the memory controller at its input pin PARIN one or two cycles after the corresponding data input, compares it with the data received on the D-inputs and indicates on its opendrain PTYERR pin (active low) whether a parity error has occurred. The number of cycles depends on the setting of C1.