AT88SC1608-09ET-00 Atmel, AT88SC1608-09ET-00 Datasheet - Page 2

• Manufacturer Part Number: AT88SC1608-09ET-00
• Description: IC EEPROM 16KBIT 1MHZ M2E
• Manufacturer: Atmel
• Series: CryptoMemory®r

Specifications of AT88SC1608-09ET-00

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 16K (2K x 8)
• Speed: 1MHz
• Interface: Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: M2 E, Smart Card Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Memory Access
2
AT88SC1608
The embedded authentication protocol allows the memory and the host to authenticate each
other. When this device is used with a host which incorporates a microcontroller (e.g., AT89C51,
AT89C2051, AT90S1200), the system provides an “anti-wiretapping” configuration. The device
and the host exchange “challenges” issued from a random generator and verify their values
through a specific cryptographic function included in each part. When both agree on the same
result, the access to the memory is permitted.
Figure 2-1.
Depending on the device configuration, the host might carry out the authentication protocol
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 secu-
rity 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 memory is unlocked, the two-wire serial protocol is effec-
tive, 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.
COMPUTE Challenge B
Device
VERIFY (WPW)
VERIFY (RPW)
Card Number
Challenge B
Security Methodology
Write 0 or 1
Verify A
DATA
COMPUTE Challenge A
Challenge A
VERIFY B
Read Password (RPW)
Write Password (WPW)
DATA
Host (Reader)
0971H–SMEM–6/08