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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.

■ 5 V Single Supply Voltage

■ Counting Capability (two options)

– up to 32767 (85 -1)

– 8 times reloadable, up to 4095 (84-1)

■ Active Authentication Function (ST1335D/55D)

■ Cipher Block Chaining Function (ST1355D)

■ Memory Divided into :

– 16 bits of Circuit Identification

– 48 bits of Card Identification

– 40 bits of Count Data

– 16 bits for Validation Certificate

– 24 bits of Transport Code

– 64 bits of Issuer Data (ST1336D) or Authentication Secret Key (ST1335D/55D)

– 32 bits of Anti-tearing Flags (optional)

– 56 bits of User data (optionally not erasable)

■ More than 500,000 Erase/Write Cycles

■ More than 10 Years Data Retention

■ 3.5 ms Programming Time at 5 V (typical)

■ 500 μA Supply Current at 5 V (typical)

■ 250 μA Stand-by Current at 5 V (typical)