Apparatus containing circuit-protection devices
Apparatus including an array of memory cells may include circuit-protection devices that may include first and second circuit-protection units, a first gate having a first source/drain connected to a first node of the first circuit-protection unit, and a second gate having a first source/drain connected to a first node of the second circuit-protection unit, wherein a second source/drain of the first gate is connected to a second source/drain of the second gate.
1. An apparatus, comprising:
an array of memory cells;
a plurality of data lines, each data line of the plurality of data lines connected to a respective set of memory cells of the array of memory cells;
peripheral circuitry for access of the array of memory cells;
a first transistor comprising a control gate, a first source/drain connected to the peripheral circuitry, and a second source/drain connected to a first data line of the plurality of data lines;
a second transistor comprising a control gate, a first source/drain connected to the peripheral circuitry, and a second source/drain connected to a second data line of the plurality of data lines; and
a third transistor comprising a control gate, a first source/drain connected to the second source/drain of the first transistor, and a second source/drain connected to a source of the array of memory cells; and
a fourth transistor comprising a control gate, a first source/drain connected to the second source/drain of the second transistor, and a second source/drain connected to the second source/drain of the third transistor.
2. The apparatus of claim 1 , wherein each data line of the plurality of data lines is selectively connected to its respective set of memory cells of the array of memory cells through a plurality of select gates.
3. The apparatus of claim 1 , wherein the connections to the peripheral circuitry are selective connections.
4. The apparatus of claim 1 , wherein the peripheral circuitry comprises circuitry selected from a group consisting of a data cache and a data register.
5. The apparatus of claim 1 , further comprising:
a fifth transistor comprising a control gate, a first source/drain connected to the peripheral circuitry, and a second source/drain connected to a third data line of the plurality of data lines;
a sixth transistor comprising a control gate, a first source/drain connected to the peripheral circuitry, and a second source/drain connected to a fourth data line of the plurality of data lines;
a seventh transistor comprising a control gate, a first source/drain connected to the second source/drain of the fifth transistor, and a second source/drain connected to the source of the array of memory cells; and
an eighth transistor comprising a control gate, a first source/drain connected to the second source/drain of the sixth transistor, and a second source/drain connected to the second source/drain of the seventh transistor;
wherein the control gate of the first transistor and the control gate of the fifth transistor are commonly connected to a first control line;
wherein the control gate of the second transistor and the control gate of the sixth transistor are commonly connected to a second control line;
wherein the control gate of the third transistor and the control gate of the seventh transistor are commonly connected to a third control line; and
wherein the control gate of the fourth transistor and the control gate of the eighth transistor are commonly connected to a fourth control line.
6. The apparatus of claim 5 , wherein the third control line comprises a spur forming a gate between the first source/drain of the third transistor and the first source/drain of the seventh transistor, and wherein the fourth control line comprises a spur forming a gate between the first source/drain of the fourth transistor and the first source/drain of the eighth transistor.
7. The apparatus of claim 6 , wherein a corner between the third control line and its spur is rounded, and wherein a corner between the fourth control line and its spur is rounded.
8. The apparatus of claim 6 , wherein the spur of the third control line extends over an isolation region between the first source/drain of the first transistor and the first source/drain of the fifth transistor, and wherein the spur of the fourth control line extends over an isolation region between the first source/drain of the second transistor and the first source/drain of the sixth transistor.
9. The apparatus of claim 8 , wherein the first control line comprises a spur extending toward the spur of the third control line and over the isolation region between the first source/drain of the first transistor and the first source/drain of the fifth transistor, and wherein the second control line comprises a spur extending toward the spur of the fourth control line and over the isolation region between the first source/drain of the second transistor and the first source/drain of the sixth transistor.
10. The apparatus of claim 9 , wherein a corner between the first control line and its spur is rounded, and wherein a corner between the second control line and its spur is rounded.
11. The apparatus of claim 5 , wherein the third control line and the fourth control line are electrically connected.
12. The apparatus of claim 5 , further comprising an isolation region between the first source/drain of the first transistor and the first source/drain of the fifth transistor, and an isolation region between the first source/drain of the second transistor and the first source/drain of the sixth transistor.