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 bit wise fashion for reading and programming, and in a byte-wise fashion for internal erasing.
â 5 V Single Supply Voltage
â Counting Capability (two options)
â up to 32767 (85 -1)
â 8 times reloadable, up to 4095 (84-1)
â Active Authentication Function (ST1335D/55D)
â Cipher Block Chaining Function (ST1355D)
â Memory Divided into :
â 16 bits of Circuit Identification
â 48 bits of Card Identification
â 40 bits of Count Data
â 16 bits for Validation Certificate
â 24 bits of Transport Code
â 64 bits of Issuer Data (ST1336D) or Authentication Secret Key (ST1335D/55D)
â 32 bits of Anti-tearing Flags (optional)
â 56 bits of User data (optionally not erasable)
â More than 500,000 Erase/Write Cycles
â More than 10 Years Data Retention
â 3.5 ms Programming Time at 5 V (typical)
â 500 µA Supply Current at 5 V (typical)
â 250 µA Stand-by Current at 5 V (typical)
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