Semiconductor device
AssigneeElpida Memory, Inc.
InventorsYuya Yamada, Ichiro Abe
Life of this patent
Estimating the term…
Abstract
A semiconductor device includes a bit line; a data bus line corresponding to the bit line; a selection transistor that controls electrical connection between the bit line and the data bus line; a write amplifier that writes data to the bit line through the data bus; and a test circuit. The test circuit sets the bit line to a first potential during a test period regardless of an operation of the write amplifier, sets the data bus line to a second potential and then sets the data bus line in a floating state to detect transition of the data bus line from the second potential to the first potential, with the selection transistor being activated to electrically connect the bit line and the data bus line.
Claims20
A semiconductor device comprising:
- a bit line;
- a data bus line provided corresponding to said bit line;
- a selection transistor that controls electrical connection between said bit line and said data bus line;
- a write amplifier that writes data to said bit line through said data bus;
- and
- a test circuit, wherein
- during a test period,
- said test circuit sets said bit line to a first potential, regardless of an operation of said write amplifier, sets said data bus line to a second potential and then sets said data bus line in a floating state,
- said selection transistor being activated to electrically connect said bit line and said data bus line,
- said test circuit detecting transition of said data bus line from said second potential to said first potential.
Dependencies are inferred from the claim text.