
SEMICONDUCTOR MEMORY DEVICES 435
since we know all the signals associated with memory functioning. Data lines are bi-directional
as data can be read or written – the drivers shown indicate the direction of data travel.
What are the merits and de-merits of SRAM?
To achieve low levels of power consumptions, CMOS is typically used for SRAM technology.
It uses less power than DRAM (which we will talk about, soon), but at high frequencies, it
can also consume signifi cant amounts of power. Because each cell needs at least six transistors,
SRAMs are more expensive and less dense compared to DRAMs. Hence, they are not used as
the primary (main) memor ...