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SLE4432 Datasheet(PDF) 11 Page - Siemens Semiconductor Group

Part # SLE4432
Description  ICs for Chip Cards Intelligent 256-Byte EEPROM
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Manufacturer  SIEMENS [Siemens Semiconductor Group]
Direct Link  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

SLE4432 Datasheet(HTML) 11 Page - Siemens Semiconductor Group

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SLE 4432
SLE 4442
Semiconductor Group
9
SLE 4442
Additionally to the above functions the SLE 4442 provides a security code logic which controls the
write/erase access to the memory. For this purpose the SLE 4442 contains a 4-byte security
memory with an Error Counter EC (bit 0 to bit 2) and 3 bytes reference data. These 3 bytes as a
whole are called Programmable Security Code (PSC). After power on the whole memory, except for
the reference data, can only be read. Only after a successful comparison of verification data with the
internal reference data the memory has the identical access functionality of the SLE 4432 until the
power is switched off. After three successive unsuccessful comparisons the Error Counter blocks
any subsequent attempt, and hence any possibility to write and erase.
2.2
Transmission Protocol
The transmission protocol is a two wire link protocol between the interface device IFD and the
integrated circuit IC. It is identical to the protocol type “S = A”. All data changes on I/O are initiated
by the falling edge on CLK.
The transmission protocol consists of the 4 modes:
Note: The I/O pin is open drain and therefore requires an external pull up resistor to achieve a high
level.
– Reset and Answer-to-Reset
– Command Mode
– Outgoing Data Mode
– Processing Mode
Operational modes


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