Low power transient voltage collapse apparatus and method for a memory cell

1. An apparatus comprising:

a power supply node;

a device operable to adjust voltage on the power supply node;

a feedback unit coupled to the power supply node, the feedback unit to control the device in response to a voltage level of the voltage on the power supply node, wherein the feedback unit comprises a capacitor; and

a logic unit coupled to the feedback unit to generate a feedback control signal to control the feedback unit.

2. The apparatus of claim 1 , wherein the device is coupled to the power supply node and another node, and wherein the other node is at least one of:

a ground node;

a capacitive load; or

a node with a voltage potential lower than a power supply voltage.

3. The apparatus of claim 2 , wherein the device is at least one of:

a p-type device; or

an n-type device.

4. The apparatus of claim 1 , wherein the feedback unit comprises a circuit with hysteresis.

5. The apparatus of claim 4 , wherein the circuit with hysteresis comprises a Schmitt-trigger which includes a device which is operable to adjust tripping point of the Schmitt-trigger base on the feedback control signal.

6. The apparatus of claim 1 , wherein the capacitor is at least one of:

a metal capacitor;

a non-metal capacitor; or

a hybrid capacitor including a metal capacitor and a device capacitor.

7. The apparatus of claim 1 , wherein one terminal of the capacitor is connected to the power supply node, and wherein another terminal of the capacitor is operable to couple to a reference voltage or to a floating node.

8. The apparatus of claim 1 further comprises a memory cell coupled to the power supply node.

9. An apparatus comprising:

a power supply node;

an internal node operable to float or be driven by a reference signal;

a pull-down device operable to pull down voltage on the power supply node; and

a capacitor having a the first terminal connected to the power supply node and a second terminal connected to the internal node, the capacitor to indirectly control the pull-down device in response to a voltage level of the voltage on the power supply node.

10. The apparatus of claim 9 further comprises a logic gate coupled to the internal node and the pull-down device.

11. The apparatus of claim 9 further comprises:

a reference generator to generate the reference signal; and

a select unit to couple the reference signal to the internal node in response to a control signal.

12. The apparatus of claim 11 , wherein the select unit is a pass-gate.

13. The apparatus of claim 9 further comprises a memory cell coupled to the power supply node.

14. The apparatus of claim 9 , wherein the pull-down device is coupled to the power supply node and another node.

15. The apparatus of claim 14 , wherein the another node is at least one of:

a ground node;

a capacitive load; or

a node with a voltage potential lower than a power supply voltage.

16. The apparatus of claim 15 , wherein the pull-down device is at least one of:

a p-type device; or

an n-type device.

17. A system comprising:

a wireless interface;

a processor operable to communicate with another device using the wireless interface, the processor including:

a power supply node;

a device operable to adjust voltage on the power supply node;

a feedback unit coupled to the power supply node, the feedback unit to control the device in response to a voltage level of the voltage on the power supply node,

wherein the feedback unit comprises a capacitor; and

a logic unit coupled to the feedback unit to generate a feedback control signal to control the feedback unit; and

a display unit to display content processed by the processor.

18. The system of claim 17 , wherein the device is coupled to the power supply node and another node, and wherein the other node is at least one of:

a ground node;

a capacitive load; or

a node with a voltage potential lower than a power supply voltage.

19. The apparatus of claim 18 , wherein the device is at least one of:

a p-type device; or

an n-type device.