Common Storage card is a kind of contact mode IC card without logical encryption. The capacity of the chips ranges between 1kbit and 64kbit. AT24C02: 2k bit non-encryption card, just can read and write AT24C16: 16k bit non-encryption card, just can read and write AT24C64: 64k bit non-encryption card, just can read and write Operating frequency: 1MHz(5V) 1ZHz(2.7V) 400KHz(1.8V) Operating voltage: 5V, min 1.8V if require Writeerase: 1,000,000 times Data retention: 100yares Application area: Data storage, phone card, campus card and so on The logical encryption cards are widely used in medical insurance, data storage, net bar toll, door-control and so on. The chips we adopt include Siemens series and ATMEL series, the capacity range between 2k bit and 16k bit. AT88SC102: 1K bit logical encryption card AT88SC1604: 16k bit logical encryption card AT88SC1608: 16k bit or 2k byte logical encryption card SLE4442: 256bytes encryption card, can read data, write data, protect data and write password. SLE4428:1024bytes encryption card, can read data, write data, protect data and do password operation.