The HEF4042B is a 4-bit latch with four data inputs (D0 to D3), four buffered latch outputs (O0 to O3), four buffered complementary latch outputs (O0 to O3) and two common enable inputs (E0 and E1). Information on D0 to D3 is transferred to O0 to O3 while both E0 and E1 are in the same state, either.
