摘要:
A liquid crystal composition according to an exemplary embodiment of the present invention includes a liquid crystal compound represented by a below chemical formula (I) at about 10 wt % to about 15 wt %; and at least one liquid crystal compound at about 3 wt % to about 8 wt % among liquid crystal compounds represented by chemical formula (II) to chemical formula (IV). Here, X and Y may be equal to each other or different from each other, and each is an alkyl group or an alkenyl group having a carbon number of 1 to 4.
摘要:
A semiconductor device comprises a plurality of cell blocks activated in response to a plurality of selection signals, respectively, a pre-selection signal generator configured to generate a plurality of pre-selection signals corresponding to the cell blocks, respectively, and activate at least two of the pre-selection signals by decoding addresses in a multi-test mode, a selection signal controller configured to selectively activate the plurality of selection signals in response to the plurality pre-selection signals and control active periods of the activated selection signals so as not to overlap, and a decision circuit configured to decide whether or not the cell blocks activated in response to the activated selection signals are repaired in response to stored repair information and the plurality of selection signals.
摘要:
A semiconductor memory device includes an alignment unit configured to align data received from the outside, a plurality of data input/output lines corresponding to the aligned data, respectively and a realignment unit configured to change correspondence between the data and the data input/output lines in response to one or more change signals in a test mode. A method for testing the semiconductor memory device includes inputting data in series using a testing apparatus, aligning the serial data in parallel, and realigning the parallel data in response to one or more change signals.
摘要:
Semiconductor device and semiconductor memory device include a plurality of internal circuits configured to perform test operations in response to their respective test mode signals and a plurality of test-mode control units configured to control the test operations of the internal circuits to be disabled in response to a test-off signal.
摘要:
A power-down control circuit utilizes the control signals employed in an active mode operation to operate when a power-down mode entry command is received during an active mode operation. The circuit is simplified requiring less area for devising the control circuit while lowering power consumption. The power-down control circuit in a semiconductor memory device includes at least a clock enable buffer unit, an external clock buffer unit, a latch unit, a control circuit for controlling internally operating clocks employed in active mode operation by using a control signal used in the active mode operation when a power-down mode entry command is received during the active mode operation, and a clock enable generation circuit for outputting clock enable signals for enabling entry to the power-down mode by using the clock control signals, when the external clock pulse signal is low level.
摘要:
On die termination (ODT) device that can reduce the number of lines for transferring calibration codes to reduce the size of a chip including the ODT device. The ODT device includes a calibration circuit configured to generate calibration codes for determining a termination resistance, a counting circuit configured to generate counting codes increasing with time. A transferring circuit of the device is configured sequentially to transfer the calibration codes in response to the counting codes. A receiving circuit is configured sequentially to receive the calibration codes from the transferring circuit in response to the counting codes. A termination resistance circuit of the device is configured to perform impedance matching using a resistance determined according to the calibration codes.
摘要:
A semiconductor memory device includes: a first count unit for counting a delayed locked loop (DLL) clock in response to a clock enable signal; a first delay unit for delaying the clock enable signal for a delay time which corresponds to a delay amount of a delay model included in a DLL circuit; a second count unit for counting an external clock in response to the delayed clock enable signal; a comparison unit for comparing an output of the first count unit with an output of the second count unit in order to generate a latency signal; and an output enable signal generation unit for generating an output enable signal by using the latency signal.
摘要:
A data output control circuit includes a data output control circuit configured to compensate a delay amount of a system clock on a clock path when a delay locked loop (DLL) circuit is enabled in such a state that the semiconductor memory device exits a reset state in response to an active signal, and to determine an output timing of data corresponding to a read command by counting the system clock and a DLL clock outputted from the DLL circuit 0 when the DLL circuit 0 is disabled, without compensating the delay amount.
摘要:
A semiconductor memory device is provided to improve the tAA characteristics. The semiconductor memory device includes: a discrimination signal generating unit for generating a first discrimination signal denoting a write operation of the semiconductor memory device; a selective delay unit for delaying a command-group signal in response to a second discrimination signal; and a fuse unit for generating the second discrimination signal based on the first discrimination signal, the second discrimination signal determining whether the selective delay unit selectively delays the command-group signal in response to the first discrimination signal.
摘要:
A power-down control circuit utilizes the control signals employed in an active mode operation to operate when a power-down mode entry command is received during an active mode operation. The circuit is simplified requiring less area for devising the control circuit while lowering power consumption. The power-down control circuit in a semiconductor memory device includes at least a clock enable buffer unit, an external clock buffer unit, a latch unit, a control circuit for controlling internally operating clocks employed in active mode operation by using a control signal used in the active mode operation when a power-down mode entry command is received during the active mode operation, and a clock enable generation circuit for outputting clock enable signals for enabling entry to the power-down mode by using the clock control signals, when the external clock pulse signal is low level.