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What different are between 6T SRAM and 4T SRAM?

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nemolee

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4t sram

What different are between 6T SRAM and 4T SRAM?
Please compare according to area and power.
And what are their circuit?
 

Different types of SRAM cells are based on the type of load used in the elementary inverter of the
flip-flop cell. There are currently three types of SRAM memory cells :
• The 4T cell (four NMOS transistors plus two poly load resistors)
• The 6T cell (six transistors—four NMOS transistors plus two PMOS transistors)
• The TFT cell (four NMOS transistors plus two loads called TFTs)
http://smithsonianchips.si.edu/ice/cd/MEMORY97/SEC08.PDF
Regards,
IanP
 

6T SRAM is standard with 2 back to back inverter as latch and 2 pass gate transistor. 4T SRAM, the PMOS in the inverter replace by a poly resistor. Usually, 4T SRAM is smaller because it only need a single PWELL. The power consumption is depends on the speed but not the SRAM type.
 

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