1. A semiconductor device, comprising:
a single semiconductor substrate;
a main circuit unit on said substrate;
a test unit, on said substrate, that includes at least one element to be measured;
a controller, on said substrate, that energizes the element to be measured in a state in which power consumption of the main circuit unit is kept substantially at zero or almost constant; and
a switch controlled by the controller, the switch selectively supplying power to the test unit and the main circuit unit, wherein the controller keeps the power consumption of the test unit substantially at zero by stopping power supply to the test unit during operation of the main circuit unit, and wherein the controller keeps the power consumption of the main circuit unit substantially at zero by stopping power supply to the main circuit unit during operation of the test unit.
2. The semiconductor device as claimed in claim 1, wherein the test unit includes a plurality of elements to be measured, and the controller can selectively energizes the plurality of elements to be measured.
3. The semiconductor device as claimed in claim 2, wherein the plurality of elements to be measured are transistors of different kinds from each other.
4. The semiconductor device as claimed in claim 1, wherein the controller keeps the power consumption of the main circuit unit almost constant by bringing the main circuit unit into a standby state.
5. The semiconductor device of claim 1, further comprising a common power supply terminal that supplies power to each of the main circuit unit, the test unit, and the controller.
6. A semiconductor device, comprising:
on a single semiconductor substrate,
a plurality of chip pads that receive a test command from a tester,
a voltage supply pad that is supplied with an operation voltage,
a main circuit unit,
a test unit that includes at least one element to be measured, and
a controller between the chip pads and the main circuit and the test unit, the controller controlling the main circuit unit and the test unit to be in a first condition wherein the main circuit is deactivated and the test unit is activated after being in a second condition wherein the main circuit unit and the test unit are deactivated, while the main circuit unit and the test unit are supplied with the operation voltage in response to the test command,
wherein a first power supply current and a second power supply current that flow through the semiconductor device are measured under the first condition and the second condition, respectively, and a difference between the first power supply current and the second power supply current is calculated as a power supply current of the test unit.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A sheet feeding unit to be inserted between a printer main unit configured to perform printing on a sheet and a sorting unit having a plurality of discharge trays to which the sheet that has undergone printing is to be discharged, the sheet feeding unit being connectable to the printer main unit, the sorting unit, and another sheet feeding unit, the sheet feeding unit comprising:
a casing in which the sheet, as a recording medium, is housed and through which a feed path and a discharge conveyance path extend horizontally, the feed path being configured to feed the sheet to the printer main unit, the discharge conveyance path being configured to convey the sheet that has undergone printing performed by the printer main unit to the sorting unit,
wherein the casing has on a face thereof adjacent to the printer main unit an exit of the feed path and an entrance of the discharge conveyance path, and on a face thereof adjacent to the sorting unit an entrance of the feed path and an exit of the discharge conveyance path, and
wherein the positions of the exit and entrance of the feed path coincide with each other when seen in a conveyance direction in which the sheet is conveyed, and the positions of the entrance and exit of the discharge conveyance path coincide with each other when seen in the conveyance direction.
2. A printer comprising:
a printer main unit;
a sorting unit; and
at least one sheet feeding unit according to claim 1 provided between the printer main unit and the sorting unit,
wherein the positions of the entrance and exit of the feed path of the sheet feeding unit and an entrance of the printer main unit from which the sheet enters coincide with one another when seen in the conveyance direction, and
wherein the positions of the entrance and exit of the discharge conveyance path of the sheet feeding unit, an exit of the printer main unit from which the sheet exits, and an entrance of the sorting unit from which the sheet enters coincide with one another when seen in the conveyance direction.
3. The printer according to claim 2,
wherein a conveyance path in the sorting unit includes
a large-sized-sheet conveyance path provided on the upstream side in the conveyance direction; and
a small-sized-sheet conveyance path provided on the downstream side with respect to the large-sized-sheet conveyance path and whose width in a direction orthogonal to the conveyance direction is smaller than that of the large-sized-sheet conveyance path, and
wherein the large-sized-sheet conveyance path is connected to a large-sized-sheet discharge tray, and the small-sized-sheet conveyance path is connected to a small-sized-sheet discharge tray.
4. The printer according to claim 3,
wherein the sorting unit has the discharge trays on a first face thereof opposite a second face thereof connected to the sheet feeding unit and on a third face continued from the first face, and
wherein the conveyance path in the sorting unit extends along the first face and reaches the third face, the large-sized-sheet discharge tray is provided on the first face, and the small-sized-sheet discharge tray is provided on the third face.
5. The printer according to claim 3, wherein an unnecessary-sheet discharge tray is provided on the upstream side in the conveyance direction with respect to the large-sized-sheet discharge tray.
6. The printer according to claim 3,
wherein the discharge conveyance path in the sheet feeding unit is provided at a lower level than the feed path, and the exit of the printer main unit is provided at a lower level than the entrance of the printer main unit,
wherein the sorting unit has a first face, a second face opposite the first face and connected to the sheet feeding unit, and a third face continued from the first face,
wherein the conveyance path in the sorting unit extends from near a bottom face to a top face, the top face being the third face of the sorting unit, and
wherein the large-sized-sheet discharge tray includes a plurality of large-sized-sheet discharge trays including a large-sized-sheet bulk discharge tray having the largest capacity thereamong, the large-sized-sheet bulk discharge tray being provided at an uppermost position on the first face of the sorting unit.
7. The printer according to claim 6,
wherein the conveyance path in the sorting unit includes a main conveyance path extending in the conveyance direction and sub-conveyance paths branching off from the main conveyance path and extending to the discharge trays,
wherein flap members capable of changing a direction in which the sheet advances are provided at branch points, respectively, between the main conveyance path and the sub-conveyance paths,
wherein, in a non-drive initial state, one of the flap members provided at a corresponding one of the branch points between the main conveyance path and one of the sub-conveyance paths that is connected to the large-sized-sheet bulk discharge tray is oriented in such a manner as to guide the sheet to the one sub-conveyance path, and
wherein, in the non-drive initial state, the other flap members provided at the other branch points between the main conveyance path and the other sub-conveyance paths that are connected to the discharge trays provided on the upstream side in the conveyance direction with respect to the large-sized-sheet bulk discharge tray are oriented in such a manner as to prevent the sheet from entering the other sub-conveyance paths.
8. A sheet feeding unit comprising:
a first conveyance path configured to guide a sheet from a first entrance provided on a first side face to a first exit provided on a second side face;
a first conveyor configured to convey the sheet in the first conveyance path to the first exit;
a second conveyance path configured to guide the sheet from a second entrance provided on the second side face to a second exit provided on the first side face;
a second conveyor configured to convey the sheet in the second conveyance path to the second exit;
a sheet housing portion housing the sheet; and
a sheet feeder configured to feed the sheet housed in the sheet housing portion into the first conveyance path.
9. The sheet feeding unit according to claim 8, wherein the second side face resides opposite the first side face.
10. The sheet feeding unit according to claim 8, wherein the sheet housing portion houses a continuous form wound in a roll.