AT88SC0204C ATMEL [ATMEL Corporation], AT88SC0204C Datasheet - Page 2

• Manufacturer Part Number: AT88SC0204C
• Description: CryptoMemoryR 2 Kbit
• Manufacturer: ATMEL [ATMEL Corporation]

Description
Smart Card Applications
Embedded Applications
Pin Descriptions
Supply Voltage (V
Clock (SCL/CLK)
Serial Data (SDA/IO)
2
AT88SC0204C
CC
)
The AT88SC0204C member of the CryptoMemory family is a high-performance secure
memory providing 2 Kbits of user memory with advanced security and cryptographic
features built in. The user memory is divided into four 64-byte zones, each of which may
be individually set with different security access rights or combined together to provide
space for 1 to 4 data files.
The AT88SC0204C 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, 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 opera-
tions. The AT88SC0204C offers the ability to communicate with virtually any smart card
reader using the asynchronous T = 0 protocol (Gemplus Patent) defined in ISO 7816-3.
Through dynamic, symmetric-mutual authentication, data encryption, and the use of
encrypted checksums, the AT88SC0204C 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 1.5 MHz is used for
fast and efficient communications with up to 15 devices that may be individually
addressed. The AT88SC0204C is available in industry standard 8-lead packages with
the same familiar pinout as 2-wire serial EEPROMs.
Figure 1. Block Diagram
The V
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 used, the SCL/CLK input is used to positive edge
clock data into the device and negative edge clock data out of the device.
The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and
may be wired with any number of other open drain or open collector devices. An exter-
SCL/CLK
SDA/IO
GND
VCC
CC
RST
input is a 2.7V to 5.5V positive voltage supplied by the host.
Asynchronous
Synchronous
ISO Interface
Management
Reset Block
Interface
Power
Certification Unit
Answer to Reset
Encryption and
Authentication,
Data Transfer
Verification
Password
Generator
EEPROM
Random
2022ES–SMEM–07/04