A non-volatile look-up table design using PCM (phase-change memory) cells

This paper describes the design and fabrication of a digital look-up table (LUT) circuit using phase-change random access memory (PCRAM) cells. The LUT, fabricated in IBM 90 nm CMOS technology with embedded GST (Ge
2
Sb
2
Te
5
)-based phase-change memory (PCM) mushroom cell, performs programmable and non-volatile logic functions with a 1V supply. The PCRAM cell provides > 100X resistance transformation ratio and the LUT achieves a 453.4ps (average) propagation delay.