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US 4,376,275 AGranted
Very fast BCD-to-binary converter
AssigneeBurroughs Corporation
InventorLaurence P. Flora
Life of this patent
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Abstract
A very fast BCD-to-binary converter useful for addressing a digital memory. The converter includes a logical level comprised of at least three specially chosen AND-OR-INVERT integrated circuit gates, having at least five inputs, for producing binary output signals representing bits of the converted binary number.
Claims11
In apparatus for converting a plurality of BCD binary signals representing a plurality of BCD digits into a plurality of binary signals representing an output binary number, the combination comprising:
- a plurality of at least three AND-OR-INVERT gates provided at the same logical level, each AND-OR-INVERT gate having the following characteristics:
- (1) the gate is provided on a single integrated circuit chip;
- (2) the gate has an input capability of at least five input signals;
- (3) the gate is capable of ORing at least two different logical functions of the inputs;
- (4) at least one of the ORed functions includes an AND combination of at least two inputs;
- (5) the gate output corresponds to the INVERTed ORed result;
- and
- (6) the gate provides a worst-case delay of no greater than 7 nanoseconds;
- logic means responsive to particular ones of said BCD binary signals for applying a predetermined plurality of binary signals to each of said AND-OR-INVERT gates such that each AND-OR-INVERT gate provides a binary output signal corresponding to a different one of the binary signals representing said binary number.
6 more elements
Dependencies are inferred from the claim text.