ST1355D Datasheet | STMicroelectronics

DESCRIPTION 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 Figure 1. Logic Diagram Table 1. Signal Names CLK RST I/O VCC GND Clock Reset Serial Data Input / Output Supply Voltage ST1335D ST1336D ST1355D CLK I/O Ground AI03729 June 2000 plete data available under NDA . 1/4 ST1335D, ST1336D, ST1355D Figure 2. D15 Contact Connections ST1335D ST1336D ST1355D VCC RST GND The anti-tearing mechanism guards against miscounts occurring when the card is prematurely extracted, while an operation is underway, in an open reader. MODES The device works in two distinct modes of operation: - Issuer Mode: for the card manufacturer. allowing custom data to be written to the device, to initialize it before release to the end user. - User Mode: for the end user of the card, with restricted, and controlled access to the device. Before delivery, from ST to the card issuer, the device is placed in the Issuer Mode. This operation is performed by blowing the “test fuse”. OPTIONS Three options are available when ordering the device: - The anti-tearing mechanism can be disconnected. In this case, the anti-tearing flag area from bit 288d to bit 319d is unused (Figure 3). - The user area, from bit 320d to bit 375d, can be defined as “not erasable” in the User Mode. - The reload mechanism can be activated. In this case, erasing a bit in the reload counter refreshes the certificate (CER). At this time, the certificate can be programmed with a new value. ORDERING INFORMATION The notation used for the device number is as shown in Table 2. For a list of available options (speed, package, etc.) or for further information on any aspect...