Digital IC Terminology

Current and voltage Parameters:

· V_IH(min)-High Level Input Voltage: The minimum voltage level required for a logical 1 at an input. Any voltage below this level will not be accepted as a HIGH by the logic circuit.

· V_IL(max)-Low Level Input Voltage: The maximum voltage level required for a logical 0 at an input. Any voltage above this level will not be accepted as a LOW by the logic circuit.

· V_OH(min)-High Level Output Voltage: The minimum voltage level at a logic circuit output in the logical 1 state under defined load conditions.

· V_OL(max)-Low Level Output Voltage: The maximum voltage level at a logic circuit output in the logical 0 state under defined load conditions.

· I_IH(min)-High Level Input Current: The current that flows into an input when a specified high level voltage is applied to that input.

· I_IL(max)-Low Level Input Current: The current that flows into an input when a specified low level voltage is applied to that input.

· I_OH(min)-High Level Output Current: The current that flows from an output in the logical 1 state under specified load conditions.

· I_OL(max)-Low Level Output Current: The current that flows from an output in the logical 0 state under specified load conditions.

The high state noise margin V_NH is defined as

V_NH=V_IH(min)-V_OH(min)

The low state noise margin V_NL is defined as

V_NL=V_IL(max)-V_OL(max)