Word Line Voltage Control in STT-MRAM
First Claim
1. A Spin Transfer Torque Magnetoresistive Random Access Memory (STT-MRAM) comprising:
- a bit cell having a magnetic tunnel junction (MTJ) and a word line transistor, wherein the bit cell is coupled to a bit line and a source line; and
a word line driver coupled to a gate of the word line transistor, wherein the word line driver is configured to provide a word line voltage greater than a supply voltage below a transition voltage of the supply voltage and to provide a voltage less than the supply voltage for supply voltages above the transition voltage.
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Abstract
Systems, circuits and methods for controlling the word line voltage applied to word line transistors in Spin Transfer Torque Magnetoresistive Random Access Memory (STT-MRAM) are disclosed. One embodiment is directed to a STT-MRAM including a bit cell having a magnetic tunnel junction (MTJ) and a word line transistor. The bit cell is coupled to a bit line and a source line. A word line driver is coupled to a gate of the word line transistor. The word line driver is configured to provide a word line voltage greater than a supply voltage below a transition voltage of the supply voltage and to provide a voltage less than the supply voltage for supply voltages above the transition voltage.
39 Citations
20 Claims
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1. A Spin Transfer Torque Magnetoresistive Random Access Memory (STT-MRAM) comprising:
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a bit cell having a magnetic tunnel junction (MTJ) and a word line transistor, wherein the bit cell is coupled to a bit line and a source line; and a word line driver coupled to a gate of the word line transistor, wherein the word line driver is configured to provide a word line voltage greater than a supply voltage below a transition voltage of the supply voltage and to provide a voltage less than the supply voltage for supply voltages above the transition voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for read and write operations in a Spin Transfer Torque Magnetoresistive Random Access Memory (STT-MRAM) comprising:
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applying a first voltage to a gate of a word line transistor of a bit cell during a write operation, wherein the first voltage is higher than a supply voltage if the supply voltage is lower than a transition voltage; and applying a second voltage to the word line transistor during a write operation, wherein the second voltage is lower than the supply voltage if the supply voltage is higher than a transition voltage. - View Dependent Claims (12, 13, 14, 15)
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16. A Spin Transfer Torque Magnetoresistive Random Access Memory (STT-MRAM) comprising:
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means for applying a first voltage to a gate of a word line transistor of a bit cell during a write operation, wherein the first voltage is higher than a supply voltage if the supply voltage is lower than a transition voltage; and means for applying a second voltage to the word line transistor during a write operation, wherein the second voltage is lower than the supply voltage if the supply voltage is higher than a transition voltage. - View Dependent Claims (17, 18, 19, 20)
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Specification