AT88SC1608-10CI-00 ATMEL [ATMEL Corporation], AT88SC1608-10CI-00 Datasheet - Page 3

• Manufacturer Part Number: AT88SC1608-10CI-00
• Description: 8 x 256 x 8 Secure Memory with Authentication
• Manufacturer: ATMEL [ATMEL Corporation]

Memory Access
Pin Descriptions
Supply Voltage (VCC)
Serial Clock (SCL)
Serial Data (SDA)
Reset (RST)
0971G–SMEM–04/04
Depending on the device configuration, the host might carry out the authentication pro-
tocol and/or present different passwords for each operation, read or write. Each user
zone may be configured for free access for read and write or for password-restricted
access. To insure security between the different user zones (multiapplication card),
each zone can use a different set of passwords. A specific AAC for each password and
for the authentication provides protection against “systematic attacks.” When the mem-
ory is unlocked, the two-wire serial protocol is effective, using SDA and SCL. The
memory includes a specific register providing a 32-bit data stream conforming to the
ISO 7816-10 synchronous answer-to-reset.
Figure 2. Block Diagram
The V
The SCL 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 wire-ORed with any number of other open drain or open collector devices. An
external pull-up resistor should be connected between SDA and VCC. The value of this
resistor and the system capacitance loading the SDA bus will determine the rise time of
SDA. This rise time will determine the maximum frequency during read operations. Low
value pull-up resistors will allow higher frequency operations while drawing higher aver-
age power supply current.
When the RST input is pulsed high, the device will output the data programmed into the
32-bit answer-to-reset register. All password and authentication access will be reset.
Following a reset, device authentication and password verification sequences must be
presented to re-establish user access.
VCC
GND
SCL
SDA
RST
CC
input is a 2.7V-to-5.5V positive voltage, supplied by the host.
Interface
Power
ISO
Mgt.
Authentication
Verification
Password
To Reset
Transfer
Answer
Data
Unit
AT88SC1608
Generator
EEPROM
Random
3