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Programmable Array Logic

Programmable array logic (PAL) has a programmable AND array at the input and a fixed OR array at the output. The programmable AND array of a PAL architecture is same as that of the PLA architecture. The number of programmable AND gates in PAL architecture are smaller than the number of minterms. The OR array is fixed and the AND outputs are divided between OR gates.


Figure above shows the internal architecture of a PAL device which has four input lines, an array of eight AND gates at the input and two OR gates at the output.