SRAM stands for Static Random Access Memory and it is a volatile memory that means data is lost when power is removed . It is typically used for the cache and internal registers of a CPU .
A typical 6T SRAM cell is shown in the below figure which is able to store 1 bit (0 or 1) data at a time.
Bit cell consist of a bistable latching circuitry ( i.e. two back to back connected inverters ) which is able to hold 1 bit of data and two pass transistors NM3 and NM4 . BL and BLB is the bit line and bit line bar and WL is the word line .
When word line is low then pass transistors are off and bistable latching circuitry is completely isolated from bit lines . Pass transistors are also called as access transistors .
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