ISL, a fast and dense low-power logic, made in a standard Schottky process

Abstract

Integrated Schottky logic (ISL) is a new 200 mV voltage-swing LSI logic that can be made in standard Schottky processes with a double-layer metallization. It fills the gap between low-power Schottky TTL and I/SUP 2/L for those circuits where low-power Schottky TTL consumes too much power and takes up too much chip area, and when I/SUP 2/L does not attain the required speed. An ISL gate consists of a current source and a set of Schottky output diodes (wired AND gate). Minimum propagation delay times of 2.7 ns at 200 /spl mu/A/gate are obtained, with a speed-power product of 1.2 pJ. The packing density of ISL is 120 to 180 gates/mm/SUP 2/. The logic can be combined with ECL, I/SUP 2/L, and TTL on the same chip, and can also be made in analog processes.