Semiconductor device having plural data buses and plural buffer circuits connected to data buses
View Patent ↗A plurality of buffer circuits and data buses coupled to the buffer circuits are included in a device. Each of the data buses includes first and second portions. The first portions of the data buses are arranged at a first pitch in the second direction, and the second portions of the data buses are arranged at a second pitch in the second direction, the second pitch being smaller than the first pitch.
1. A semiconductor device comprising:
a plurality of data buses each extending in a first direction;
a memory cell area having a first side extending in a second direction different from the first direction;
a buffer area located along the first side of the memory cell area, the buffer area including a plurality of buffer circuits each connected to an associated one of the data buses, wherein
each of the data buses has a first portion located over the memory cell area and a second portion located over the buffer area,
the first portions of the data buses are arranged at a first pitch in the second direction,
the second portions of the data buses are arranged at a second pitch in the second direction, and
the second pitch is smaller than the first pitch; and
a pad area in which a plurality of external terminals are arranged in the second direction,
wherein the buffer area is located between the memory cell area and the pad area.
2. The semiconductor device as claimed in claim 1 , further comprising a pitch conversion area that is located between the memory cell area and the buffer area,
wherein a pitch of the data buses in the second direction is converted from the first pitch into the second pitch over the pitch conversion area.
3. The semiconductor device as claimed in claim 1 , wherein the plurality of buffer circuits include first and second buffer circuits arranged in the first direction in the buffer area.
4. The semiconductor device as claimed in claim 3 , wherein
the plurality of data buses includes first and second data buses,
the first and second buffer circuits are connected to the first and second data buses, respectively,
the first and second buffer circuits are arranged at first and second area in the buffer area, respectively,
the first area has a first passing area that allows to pass the second data bus in the first direction, and
the second area has a second passing area that allows to pass the first data bus in the first direction.
5. The semiconductor device as claimed in claim 1 , further comprising first to third power supply lines extending in the first direction over the buffer area,
wherein each of the buffer circuits includes a first circuit part located between the first and second power supply lines, a second circuit part located between the second and third power supply lines, and a connection line that extends in the second direction so as to intersect with the second power supply line and connects the first and second circuit parts with each other.
6. The semiconductor device as claimed in claim 5 , wherein the first and third power supply lines are supplied with the substantially same potential as each other.
7. A semiconductor device comprising:
a plurality of data buses each extending in a first direction;
a memory cell area having a first side extending in a second direction different from the first direction; and
a buffer area located along the first side of the memory cell area, the buffer area including a plurality of buffer circuits each connected to an associated one of the data buses, wherein
each of the data buses has a first portion located over the memory cell area and a second portion located over the buffer area,
the first portions of the data buses are arranged at a first pitch in the second direction,
the second portions of the data buses are arranged at a second pitch in the second direction, and
the second pitch is smaller than the first pitch,
wherein each of the buffer circuits includes a read buffer circuit that performs a buffering operation of a read data supplied from the memory area via the associated one of the data buses, and a write buffer circuit that performs a buffering operation of a write data to be supplied to the memory cell area via the associated one of the data buses.
8. A semiconductor device comprising:
a plurality of data buses each extending in a first direction;
a memory cell area having a first side extending in a second direction different from the first direction;
a buffer area located along the first side of the memory cell area, the buffer area including a plurality of buffer circuits each connected to an associated one of the data buses, wherein
each of the data buses has a first portion located over the memory cell area and a second portion located over the buffer area,
the first portions of the data buses are arranged at a first pitch in the second direction,
the second portions of the data buses are arranged at a second pitch in the second direction, and
the second pitch is smaller than the first pitch; and
a plurality of circuit blocks each includes at least an internal voltage generating circuit that generates an internal voltage,
wherein each of the circuit blocks are arranged between two buffer areas in the second direction.
9. The semiconductor device as claimed in claim 8 , wherein the buffer areas and the circuit blocks have the substantially same width as one another in the first direction.
10. The semiconductor device as claimed in claim 8 , further comprising an internal power supply line supplied with the internal voltage,
wherein the internal power supply line extends in the second direction so as to pass over the buffer circuits.
11. The semiconductor device as claimed in claim 10 , wherein the internal power supply line is branched in the first direction over each of the circuit blocks.
12. A semiconductor device comprising:
a plurality of buffer circuits each including first and second circuit nodes that are disposed substantially in line in a first direction;
a plurality of first signal lines arranged at a first pitch in a second direction that is substantially perpendicular to the first direction, each of the first signal lines being elongated from the first circuit node of associated one of the buffer circuits and running in the first direction on a side opposite to the second circuit node;
a plurality of second signal lines arranged at the first pitch in the second direction, each of the second signal lines being elongated from the second circuit node of an associated one of the buffer circuits and running in the first direction on a side opposite to the first circuit node;
a plurality of third signal lines arranged at a second pitch in the second direction, the second pitch being greater than the first pitch, each of the third signal lines running in the first direction; and
a plurality of fourth signals each disposed between an associated one of the second signal lines and an associated one of the third signal lines to connect the associated one of the second signal lines and the associated one of the third signal lines to each other.
13. The device as claimed in claim 12 , wherein each of the fourth signal lines bends to connect the associated one of the second signal lines and the associated one of the third signal lines to each other.
14. The device as claimed in claim 13 , wherein each of the fourth signal lines comprises:
a first portion extending in the first direction from an associated one of the second signal lines,
a second portion extending in the second direction from the first portion, and
a third portion extending in the first direction from the second portion and reaching an associated one of the third signal lines.
15. The device as claimed in claim 14 , wherein the device further comprises a multi-level wiring structure including a lower-level wiring, a upper-level wiring and an interlayer insulating film between the lower-level wiring and the upper-level wiring, each of the First and third portions being formed as one of the lower-level wiring and the upper-level wiring, and the second portion being formed as the other of the lower-level wiring and the upper-level wiring.
16. The device as claimed in claim 12 , wherein each of the buffer circuits comprises a first buffer that drives the first circuit node in response to a first signal supplied to the second circuit node and a second buffer that drives the second circuit node in response to a second signal supplied to the first circuit node.
17. The device as claimed in claim 16 , further comprising a plurality of memory cells each coupled to an associated one of the third signal lines, a plurality of first data signals read out from the memory cells being supplied to the second circuit nodes of the buffer circuits, and a plurality of second data signals to be written respectively into the memory cells being supplied to the first circuit nodes of the buffer circuits.
18. The device as claimed in claim 12 , wherein the buffer circuits are arranged in a plurality of rows and columns.
19. The device as claimed in claim 12 , wherein the buffer circuits are arranged in line in the first direction.