AT88SC0808C_07 Datasheet, PDF (2/18 Pages) ATMEL Corporation – CryptoMemory 8 Kbit

Description
The AT88SC0808C member of the CryptoMemory^® family is a high-performance secure
memory providing 8 Kbits of user memory with advanced security and cryptographic
features built in. The user memory is divided into 8 128-byte zones, each of which may
be individually set with different security access rights or effectively combined together
to provide space for 1 to 8 data files.
Smart Card Applications
The AT88SC0808C provides high security, low cost, and ease of implementation with-
out the need for a microprocessor operating system. The embedded cryptographic
engine provides for dynamic and symmetric mutual authentication between the device
and host, as well as performing stream encryption for all data and passwords
exchanged between the device and host. Up to four unique key sets may be used for
these operations. The AT88SC0808C offers the ability to communicate with virtually any
smart card reader using the asynchronous T = 0 protocol (Gemplus Patent) defined in
ISO 7816-3.
Embedded Applications
Through dynamic and symmetric mutual authentication, data encryption, and the use of
encrypted checksums, the AT88SC0808C provides a secure place for storage of sensi-
tive information within a system. With its tamper detection circuits, this information
remains safe even under attack. A 2-wire serial interface running at 1.0 MHz is used for
fast and efficient communications with up to 15 devices that may be individually
addressed. The AT88SC0808C is available in industry standard 8-lead packages with
the same familiar pinout as 2-wire serial EEPROMs.
Figure 2. Block Diagram
VCC
GND
Power
Management
Authentication,
Encryption and
Certification Unit
Random
Generator
SCL/CLK
SDA/IO
Synchronous
Interface
Asynchronous
ISO Interface
Data Transfer
Password
Verification
EEPROM
RST
Reset Block
Answer to Reset
Pin Descriptions
Supply Voltage (V_CC)
Clock (SCL/CLK)
The V_CC input is a 2.7V to 5.5V positive voltage supplied by the host.
In the asynchronous T = 0 protocol, the SCL/CLK input is used to provide the device
with a carrier frequency f. The nominal length of one bit emitted on I/O is defined as an
“elementary time unit” (ETU) and is equal to 372/f. When the synchronous protocol is
2 AT88SC0808C
2024HS–SMEM–04/07