A 4.5 ns access time 1K x 4 bit ECL RAM

An extremely high-speed ECL 4-kbit RAM with maximum access time of 4.5 ns and typical power dissipation of 1.5 W has been developed for cache memories and control store. This performance has been realized by using a very shallow junction transistor with an emitter size of 1.3 /spl times/ 1.5 /spl mu/m, which has a high cutoff frequency of 9 GHz, in conjunction with optimized circuit design. The RAM was housed in a small leadless chip carrier (LCC) package. The overall package size was 0.335 in/SUP 2/. The RAM was designed to have soft-error immunity. The failure rate due to alpha particles has been estimated, through acceleration tests, to be less than 50 FIT.