Bleeder and reset for static random access memory
AssigneeSynopsys, Inc.
InventorsRouwaida Nawaf Kanj, Jamil Kawa
Life of this patent
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Abstract
A circuit including: a memory cell connected to a first power supply configured to supply a first power supply voltage; a first bleeder transistor coupled between a first node of the memory cell and ground; and a second circuit coupled to a gate electrode of the first bleeder transistor and configured to supply a bleeder signal to control the first bleeder transistor in response to a drop in the first power supply voltage, wherein the first bleeder transistor is configured to discharge the memory cell in response to receiving the bleeder signal.
Claims19
A circuit comprising:
- a memory cell connected to a first power supply configured to supply a first power supply voltage;
- a first bleeder transistor coupled between a first node of the memory cell and ground;
- and
- a second circuit coupled to a gate electrode of the first bleeder transistor and configured to supply a bleeder signal to control the first bleeder transistor in response to a drop in the first power supply voltage,
- wherein the first bleeder transistor is configured to discharge the memory cell in response to receiving the bleeder signal,
- wherein the second circuit comprises a first transistor and a capacitor,
- wherein a first electrode of the first transistor is connected to a first data line and a second electrode of the first transistor is connected to a first electrode of the capacitor,
- wherein a gate electrode of the first transistor is connected to a first word line,
- wherein a second electrode of the capacitor is connected to the ground, and
- wherein the gate electrode of the first bleeder transistor is connected to the second circuit via a second transistor.
A memory cell comprising:
- a first logic gate configured to receive a first power supply voltage from a first power supply;
- a first inverter cross coupled with the first logic gate;
- a first access transistor coupled between a first data line and a first node, the first node being between an output of the first logic gate and an input of the first inverter;
- and
- a second access transistor coupled between a second data line and a second node, the second node being between an output of the first inverter and a first input of the first logic gate,
- wherein gate electrodes of the first access transistor and the second access transistor are connected to a first word line,
- wherein the first logic gate is configured to reset the memory cell in response to receiving a reset signal at a second input of the first logic gate when the first power supply is switched off.
A non-transitory computer readable medium storing a digital representation of a circuit comprising:
- a memory cell connected to a first power supply configured to supply a first power supply voltage;
- a first bleeder transistor coupled between a first node of the memory cell and ground;
- a second circuit coupled to a gate electrode of the first bleeder transistor and configured to supply a bleeder signal to control the first bleeder transistor in response to a drop in the first power supply voltage;
- and
- a third transistor coupled between the ground and the first power supply,
- wherein the first bleeder transistor is configured to discharge the memory cell in response to receiving the bleeder signal,
- wherein a first electrode and a gate electrode of the third transistor are electrically coupled to the first power supply and a second electrode of the third transistor is connected to the ground;
- and
- wherein the third transistor is a n-type transistor.
Dependencies are inferred from the claim text.