The SY100S355 offers four transparent latches with differential outputs and is designed for use in highperformance ECL systems. The Select inputs (S0, S1) select one of the two sources of input data (D0 or D1) to the latch. The Select inputs can also force the outputs to a logic LOW when the latch is in the transparent mode. The latches are in the transparent mode when both Enables (E1, E2) are at a logic LOW state. In the transparent mode, the Select inputs can pass an input logic HIGH from D0 or D1 to the output.