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AT88SC0808CA Schematic ( PDF Datasheet ) - ATMEL Corporation

Teilenummer AT88SC0808CA
Beschreibung CryptoMemory
Hersteller ATMEL Corporation
Logo ATMEL Corporation Logo 




Gesamt 24 Seiten
AT88SC0808CA Datasheet, Funktion
This is a summary document.
The complete document is
available on the Atmel website
at www.atmel.com.
AT88SC0808CA
Atmel CryptoMemory
SUMMARY DATASHEET
Features
One of a family of devices with user memories from 1-Kbit to 8-Kbits
8-Kbit (1-Kbyte) EEPROM user memory
Eight 1-Kbit (128-byte) zones
Self-timed write cycle
Single byte or 16-byte page write mode
Programmable access rights for each zone
2-Kbit configuration zone
37-byte OTP (One-Time Programmable) area for user-defined codes
160-byte area for user-defined keys and passwords
High security features
64-bit mutual authentication protocol (under license of ELVA)
Cryptographic Message Authentication Codes (MAC)
Stream encryption
Four key sets for authentication and encryption
Eight sets of two 24-bit passwords
Anti-tearing function
Voltage and frequency monitors
Smart card features
ISO 7816 Class B (3V) operation
ISO 7816-3 asynchronous T=0 Protocol (Gemplus® Patent) *
Multiple zones, key sets and passwords for multi-application use
Synchronous 2-wire serial interface for faster device initialization *
Programmable 8-byte answer-to-reset register (ATR)
ISO 7816-2 compliant modules
Embedded application features
Low voltage supply: 2.7V 3.6V
Secure nonvolatile storage for sensitive system or user information
2-wire serial interface (TWI, 5V compatible)
1.0MHz compatibility for fast operation
Standard 8-lead plastic packages, green compliant (exceeds RoHS)
Same pin configuration as Atmel® AT24CXXX Serial EEPROM in SOIC and
PDIP packages
High reliability
Endurance: 100,000 cycles
Data retention: 10 years
ESD protection: 2,000V min
* Note: Modules available with either T=0 / 2-wire modes or 2-wire mode only
Atmel-5204IS-CryptoMem-AT88SC0808CA-Datasheet-Summary_072015






AT88SC0808CA Datasheet, Funktion
Table 4-2. AC Characteristics
Applicable over recommended operating range from VCC = +2.7 to 3.6V, TAC = -40°C to +85°C, CL = 30pF
(unless otherwise noted)
Symbol
fCLK
fCLK
tR
tF
tR
tF
tAA
tHD.STA
tSU.STA
tHD.DAT
tSU.DAT
tSU.STO
tDH
tWR
Parameter
Async Clock Frequency
Synch Clock Frequency
Clock Duty cycle
“Rise Time - SDA/IO, RST”
“Fall Time - SDA/IO, RST”
Rise Time - SCL/CLK
Fall Time - SCL/CLK
Clock Low to Data Out Valid
Start Hold Time
Start Set-up Time
Data In Hold Time
Data In Set-up Time
Stop Set-up Time
Data Out Hold Time
Write Cycle Time
Min Max
14
01
40 60
1
1
9% x period
9% x period
250
200
200
10
100
200
20
5
Units
MHz
MHz
%
S
S
S
S
nS
nS
nS
nS
nS
nS
nS
mS
5. Device Operations for Synchronous Protocols
5.1 Clock and Data Transitions
The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL low time
periods (see Figure 5-3 on page 8). Data changes during SCL high periods will indicate a start or stop condition as defined
below.
5.1.1
Start condition
A high-to-low transition of SDA with SCL high defines a start condition which must precede all commands (see Figure 5-4 on
page 8).
5.1.2
Stop condition
A low-to-high transition of SDA with SCL high defines a stop condition. After a read sequence, the stop condition will place the
EEPROM in a standby power mode (see Figure 5-4 on page 8).
5.1.3
Acknowledge
All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a zero to
acknowledge that it has received each word. This happens during the ninth clock cycle (see Figure 5-5 on page 8).
6 AT88SC0808CA [Summary DATASHEET]
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AT88SC0808CA pdf, datenblatt
The write lock byte itself may be locked by writing its least significant (rightmost) bit to “0”. Moreover, when write lock mode is
activated, the write lock byte can only be programmed – that is, bits written to “0” cannot return to “1”.
In the write lock configuration, write operations are limited to writing only one byte at a time. Attempts to write more than one
byte will result in writing of just the first byte into the device.
11.3
Password Verification
Passwords may be used to protect read and/or write access of any user zone. When a valid password is presented, it is
memorized and active until power is turned off, unless a new password is presented or RST becomes active. There are eight
password sets that may be used to protect any user zone. Only one password is active at a time.
Presenting the correct write password also grants read access privileges.
11.4
Authentication Protocol
The access to a user zone may be protected by an authentication protocol. Any one of four keys may be selected to use with a
user zone.
Authentication success is memorized and active as long as the chip is powered, unless a new authentication is initialized or
RST becomes active. If the new authentication request is not validated, the card loses its previous authentication which must
be presented again to gain access. Only the latest request is memorized.
Figure 11-2. Password and Authentication Operations
Device (Card)
Card Number
VERIFY A
COMPUTE Challenge B
Challenge B
VERIFY RPW
DATA
Checksum (CS)
VERIFY WPW
VERIFY CS
Write DATA
AUTHENTICATION
READ ACCESS
WRITE ACCESS
Host (Reader)
COMPUTE Challenge A
Challenge A
VERIFY B
Read Password (RPW)
VERIFY CS
Write Password (WPW)
DATA
CS
Note:
Authentication and password verification may be attempted at any time and in any order. Exceeding
corresponding authentication or password attempts trial limit renders subsequent authentication or password
verification attempts futile.
12 AT88SC0808CA [Summary DATASHEET]
Atmel-5204IS-CryptoMem-AT88SC0808CA-Datasheet-Summary_072015

12 Page





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