Patent ID: 8154917
Filing Date: 2012-04-10
Classification: G11C

Abstract:
1. A magnetic storage device comprising: a data transfer line; a plurality of memory cells connected to the data transfer line, each of the memory cells comprising a magnetic change type resistance element in which an electric resistance changes in accordance with a magnetized state and a selection transistor, which are connected in series; a reading signal line which reads a signal from the data transfer line; a clamp transistor connected between the reading signal line and the data transfer line, the transistor being provided with a control input terminal to which a clamp voltage is supplied to fixedly hold a potential of the data transfer line; a reading circuit which reads the signal from the data transfer line, the reading circuit including: a reference data transfer line; a plurality of dummy cells connected to the reference data transfer line, respectively, each of the dummy cells having a constitution similar to that of the memory cell; a reference reading signal line which reads the signal from the reference data transfer line; a reference clamp transistor connected between the reference reading signal line and the reference data transfer line, the transistor being provided with a control input terminal to which the clamp voltage is supplied to fixedly hold a potential of the reference data transfer line; and the reference reading circuit being a reference reading circuit in which the hold switch of the reading circuit is short-circuited, the reading node of the reading circuit being connected to the reference reading signal line, a clock inverting inverter circuit which inverts the bit output of an inverter of the reference reading circuit to output the control signal φr.