Part Number : ATSHA204A
Function : Atmel CryptoAuthentication
Package : SOIC 8, SOT 3 Pin Type
Maker : Atmel Corporation
Pinouts : 
Description :
The ATSHA204A device includes an Electrically Erasable Programmable Read-Only Memory (EEPROM) array that can be used for key storage, miscellaneous read/write data, read-only, secret data, consumption logging, and security configuration.
Access to the various sections of memory can be restricted in a variety of ways, and the configuration can then be locked to prevent changes.
Features
1. Best-in-class, 256-bit Key Length; Storage for Up to 16 Keys
2. Guaranteed Unique 72-bit Serial Number
3. Internal, High-quality Random Number Generator (RNG)
4. 4.5Kb EEPROM for Keys and Data
Datasheet PDF Download : 
Others datasheet of same file :
ATSHA204, ATSHA204A-MAHCZ-T, ATSHA204A-MAHDA-T,
ATSHA204A-MXHCZ-T, ATSHA204A-MXHDA-T
