Provided are, among others, memory circuits or devices and their applications in electronic devices or systems and various implementations of an electronic device which includes a semiconductor memory unit comprising one or more columns and a date line and a data line bar connected with a column selected among the one or more columns. Each of the one or more columns includes a plurality of storage cells each configured to store 1-bit data, each storage cell including a first and second variable resistance elements; a bit line and a source line connected to the first variable resistance element; connected to the other end of the first variable resistance element; a bit line bar and a source line bar connected to the second variable resistance element; and a driving block configured to latch data of the data line and the data line bar.