Patent ID: 6037829
Filing Date: 2000-03-14
Classification: H03K

Abstract:
A look-up table circuit, the circuit including a plurality of signal inputs, a circuit output and a plurality of select lines, wherein one of the signal inputs is passed to the circuit output in response to voltages placed on the select lines, the circuit comprising:a first pass transistor coupled to the first signal input for selectively passing the first signal input to a first node;a second pass transistor coupled to the second signal input for selectively passing the second signal input to the first node;a select line coupled to control electrodes of the first and second transistors so that when one of the transistors is on the other transistor is off;one or more combinational gates, coupled to two or more select lines, for outputing an enable signal in response to the voltages on the two or more select lines; andone or more pass transistors coupled between the circuit output and the first node for selectively passing a signal at the first node, the one or more pass transistors coupled to the enable signal, the one or more pass transistors enabled by the enable signal to allow the signal at the first node to pass to the circuit output when the enable signal is at a predetermined voltage level, wherein at least one signal input is selectively passed through the one or more pass transistors to the circuit output.