A 0.6 V, 1.5 GHz 84 Mb SRAM in 14 nm FinFET CMOS Technology With Capacitive Charge-Sharing Write Assist Circuitry

摘要

A 0.6-1.1 V, 84 Mb pipelined SRAM array design implemented in 14 nm FinFET CMOS technology is presented. Two array architectures featuring a high-density 0.0500 mu m(2) 6T SRAM bitcell and a 0.0588 mu m(2) 6T SRAM bitcell targeting low voltage operation are detailed. The high-density array design reaches 2.7 GHz at 1.1 V with 14.5 Mb/mm(2) bit density, while the low voltage optimized array can operate at 0.6 V, 1.5 GHz under typical process conditions. A capacitive charge-share transient voltage collapse write-assist circuit (CS-TVC) enables a 24% reduction in write energy compared to previous techniques by eliminating bias currents during operation. Technology and assist co-optimization enable >50 mV reduction in V-MIN and a 1.81x increase in density over a 22 nm design.