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Tuesday, September 21, 2010

Digital IC Terminology

Current and voltage Parameters:

· VIH(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.

· VIL(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.

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

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

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

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

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

· IOL(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 VNH is defined as

VNH=VIH(min)-VOH(min)

The low state noise margin VNL is defined as

VNL=VIL(max)-VOL(max)

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