Overview: IZE4406
Intelligent 104-Bit EEPROM Counter for > 20000 Units with Security Logic The chip contains an EEPROM/PROM of 88 bits, a mask ROM of 16 bits and a sequencing control with security logic. Memory (104 bits) is divided into the following functional areas In the condition as supplied, the transport code and the error counter are activated. The chip can only be read (except for the transport-code area) and only the error counter can be written. Following correct entry of the transport code, the entire memory can be read and areas II and III can be written and EEPROM part of area III can be erased. After the control flag has been written, everything is readable and only area III can be programmed, but with the following changes: - The transport code and the error counter are no longer activated. - The area of the former transport code and the error counter can be erased byte by byte with carry. - The entire area III can be written bit by bit NB: When the control flag is written, the counter stage below it (the error counter) can be erased at the same time.
