Abstract: A semiconductor memory apparatus may include a memory cell circuit, a data latch circuit, and a first stage amplification circuit. The data latch circuit may be electrically coupled to the memory cell circuit by a bit line. The data latch circuit may latch data transferred through the bit line. The data latch circuit may output latched data to an input/output line in response to a cell select signal. The data first stage amplification circuit may generate driving data to a voltage level of an external power supply voltage in response to a voltage level of the input/output line. The data first stage amplification circuit may precharge the input/output line to a voltage level lower than the external power supply voltage and higher than a ground voltage in response to a precharge signal.

Abstract: A sense amplifier includes a first input circuit, a second input circuit and an amplification circuit. The first input circuit may receive a pair of first input signals and change voltage levels of amplification nodes. The second input circuit may receive a pair of second input signals and change voltage levels of the amplification nodes. The amplification circuit may receive a first voltage, amplify voltage level changes of the amplification nodes, and output a pair of output signals through output nodes.

Abstract: A gas control unit for a boiler includes a hollow housing; a solenoid; a rod; opening and shutting means that is disposed at the lower end of the rod to open and shut a gas outlet; and a spring between the housing and the opening and shutting means so as to elastically urge it downward. A coupling member is formed at the lower end of the rod and a coupling groove into which the coupling member is inserted is formed in the opening and shutting means so as to allow movement. The opening and shutting means is coupled to the rod through the use of the coupling member and the coupling groove, the opening and shutting means can move within a predetermined range about the coupling member with an application of an external force.

Abstract: Disclosed herein is a gas control apparatus for a boiler, which has a simple structure and enables easy assembly, thus improving productivity and reducing manufacturing costs, therefore enhancing the competitiveness of a product. The gas control apparatus includes a solenoid retracting or ejecting a rod in response to application of power. A cylindrical support unit is coupled to an upper portion of the solenoid and has a suction port and an exhaust port on a side surface and an upper surface thereof, respectively, with a groove being formed along a lower edge of the support unit. A separator is provided between the solenoid and the support unit in such a way that an edge thereof is inserted into the groove. An opening and shutting plate is mounted to an upper end of the rod and opens and shuts the exhaust port of the support unit.

Abstract: A gas control unit for a boiler is provided which can satisfactorily control the supply and shut-off of gas. The gas control unit for a boiler includes: a hollow housing; a solenoid that is disposed in the housing; a rod that is inserted into the solenoid and that has a lower part protruding from the housing; opening and shutting means that is disposed at the lower end of the rod so as to open and shut a gas outlet; and a spring that is disposed between the housing and the opening and shutting means so as to elastically urge the opening and shutting means downward. Here, a coupling member is formed at the lower end of the rod and a coupling groove into which the coupling member is inserted is formed in the opening and shutting means so as to allow the opening and shutting means to move.