The members of the ST1335D/36D/55D family are principally designed for use in prepaid Phonecard applications. Each is a 272-bit EEPROM device, with associated security logic and special fuses to control memory access. The memory is arranged as a matrix of 34 x 8 cells, accessed in a serial bitwise fashion for reading and programming, and in a byte-wise fashion for internal erasing. An on-chip address counter provides an internal address space of up to 512 bits.
Each member of the ST1335D/36D/55D family has an identification data area, unit-counters (with an anti-tearing mechanism for reliable usage in open readers), a post validation certificate, an issuer area (ST1336D) or an authentication secret key area (ST1335D/55D), and a user area. This is summarized in Figure 3.
The validation certificate allows the recognition of the device by the appropriate security module. When the 8 times reloadable option is activated, the certificate and the reload counter (address 64d to 71d) can be used to allow the recognition of the circuit by the appropriate security module. This will allow the development of a reloadable card as the certificate value is refreshed each time the reload counter is incremented.
The anti-tearing mechanism guards against miscounts occurring when the card is prematurely extracted, while an operation is underway, in an open reader
| 订购型号 | 产品状态 | 美金价格 | 数量 | 封装 | 包装形式 | 温度范围 | 材料声明 |
| ST1355DW4/IRAD | Active | US WF V.I. | ST1355DW4/IRAD |
| 描述 | 版本 | 大小 |
| ST1355 : DB0090: 5-contact memory card IC 272-bit EEPROM with advanced security mechanisms and inlock system | 1 | 107KB |
