A 34-ns 1-Mbit CMOS SRAM Using Triple Polysilicon

This paper will describe a 128-kbit word × 8-bit CMOS SRAM with an access time of 34 ns and a standby current of 2 µA. This RAM has been fabricated using triple-polysilicon and single-aluminum CMOS technology with 0.8-µm minimum design features. A high-resistive third polysilicon load has been developed to realize a low standby current. In order to obtain a faster access time, a 16-block architecture and a data-output presetting technique combined with address transistion detection (ATD) are used. This RAM has a “flash-clear” function in which logical zero's are written into all memory cells in less than 1 μs.