HEF4104B

The HEF4104B quadruple low voltage to high voltage translator with 3-state outputs provides the capability of interfacing low voltage circuits to high voltage circuits, such as low voltage LOCMOS and TTL to high voltage LOCMOS. HEF4104B has four data inputs (I₀ to I₃), an active HIGH output enable input (EO), four data outputs (O₀ to O₃) and their complements (O0 to O3).

With EO HIGH, O₀ to O₃ and O₀ to O₃ are in the low impedance ON-state, either HIGH or LOW as determined by I0 to I3; with EO LOW, O₀ to O₃ and O₀ to O₃ are in the high impedance OFF-state. The HEF4104B uses a common negative supply (V_SS) and separate positive supplies for inputs (VDDI) and outputs (V_DD0). V_DDI must always be less than or equal to V_DDO, even during power turn-on and turn-off. For the permissible operating range of V_DDI and V_DDO see graph Fig.4.

Each input protection circuit of HEF4104B is terminated between V_DDO and VSS. This allows the input signals to be driven from any potential between V_DDO and V_SS, without regard to current limiting. When driving from potentials greater than V_DDO or less than VSS, the current at each input must be limited to 10 mA.