A 7 ns 1 Mb BiCMOS ECL SRAM with program-free redundancy

Abstract

A 7-ns, 1 M×1/256 K×4 BiCMOS ECL (emitter coupled logic) SRAM with program-free redundancy is described. To obtain the fast address access time and low power consumption, an improved ECL buffer and two-stage sensing scheme were adopted. The SRAM was fabricated with a 0.8-μm double-poly-Si double-metal BiCMOS technology. The RAM has an ECL 10 K interface and operates at a supply voltage of -5.2 V. An access time of 7 ns has been obtained. Active 680 mW for ×4 mode. The cell size is 5.4 μm×7.2 μm (38.88 μm2); the die size is 5.46 mm×16.16 mm (88.24 mm2)