ALEXANDRIA, Va., Jan. 20 -- United States Patent no. 12,531,559, issued on Jan. 20, was assigned to Hewlett Packard Enterprise Development LP (Spring, Texas).

"Programmable logic devices with multi-level input/output signals" was invented by Rachid Kadri (Houston) and Michael Chan (Bellaire, Texas).

According to the abstract* released by the U.S. Patent & Trademark Office: "One aspect provides a programmable logic device. The device includes an input circuit for detecting a multi-level input signal and an output circuit. The input circuit includes: an input pin for receiving the multi-level input signal; first and second programmable voltage generators to generate, respectively, first and second multi-level voltage signals; a pair of comp...