Bitcell
Beginner
The smallest unit of a memory: the little circuit that stores one bit.
Novice
The circuit that stores one bit in a memory array, repeated millions of times in a grid of rows and columns. Its area sets most of the array’s area.
Expert
The repeated unit of an array, often drawn by the foundry with special ‘core’ design rules tighter than ordinary logic rules. Quoted in µm²; periphery (decoders, sense amplifiers, write drivers) is extra and dominates small macros.
Explained in Memory cells (Transistors).
See also: SRAM (static RAM), Word line, Bit line.