Asymmetric four-transistor sram cell
AssigneeCertiChip Inc.
InventorsManoj Sachdev, Mohammad Sharifkhani
Life of this patent
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Abstract
An asymmetric Static Random Access Memory (SRAM) cell is provided. The SRAM cell comprises first and second storage nodes, drive transistors and access transistors. The first and second storage nodes are configured to store complementary voltages. The drive transistors are configured to selectively couple each of the first and second storage nodes to corresponding high and low voltage power supplies, and maintain a first logic state through a feedback loop. The access transistors are configured to selectively couple each of the first and second storage nodes to corresponding first and second bit-lines and maintain a second logic state through relative transistor leakage currents. A method for reading from and writing to the SRAM cell are also provided.
Claims16
A Static Random Access Memory (SRAM) cell comprising:
- first and second storage nodes configured to store complementary voltages;
- drive transistors configured to selectively couple each of the first and second storage nodes to corresponding high and low voltage power supplies, and maintain a first logic state through a feedback loop;
- and
- access transistors configured to selectively couple each of the first and second storage nodes to corresponding first and second bit-lines and maintain a second logic state through relative transistor leakage currents.
A method for reading a logic value from an SRAM cell comprising:
- first and second storage nodes configured to store complementary voltages, drive transistors configured to selectively couple each of the first and second storage nodes to corresponding high and low voltage power supplies, and access transistors configured to selectively couple each of the first and second storage nodes to corresponding first and second bit-lines,
- the method comprising the steps of:
- pre-charging the bit-lines to a predetermined pre-charge voltage;
- accessing the cell by activating at least one of the access transistors;
- and
- sensing a change on the corresponding bit-line to determine the logic value stored in the cell.
Dependencies are inferred from the claim text.