SRAM (static RAM): definition · Chip Field Guide

Beginner

Fast memory built only from switches. Each bit sits in a tiny loop of switches that hold each other in place, as long as the power is on.

Novice

Static random-access memory. Each bit is a cell of (usually) six transistors: two inverters in a loop that holds the value, plus two access transistors. Fast and easy to build alongside logic, but large per bit. Used for caches, register files and on-chip buffers.

Expert

Bistable-latch memory, almost always the 6T cell in dense arrays (8T or 10T where reads must be decoupled or $V_{\mathrm{DD}}$ is low). Density is set by the bitcell and the periphery; stability is set by read SNM, write margin and $V_{\mathrm{T}}$ mismatch, which together set the minimum operating voltage ( $V_{\mathrm{min}}$ ).