A logic gate is formed as a full 3-EFL circuit including a full two- level ECL current switch tree and an EFL stage made up of input and output multiemitter transistors. By appropriate connections, the logic gate may be used for a variety of circuits including a 4:1 multiplexer and a comparator of two three-digit binary numbers. The logic gate advantageously is formed in a silicon chip which includes an array of cells each consisting essentially of nine single-emitter transistors, two four-emitter transistors and a number, advantageously nine, of resistors.
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