AT34C02D_14 Datasheet, PDF (1/25 Pages) ATMEL Corporation – Permanent and Reversible Software Write Protection

AT34C02D
I²C-Compatible Serial Presence Detect (SPD) EEPROM
with Permanent and Reversible Software Write Protection
2-Kbit (256 x 8)
Features
DATASHEET
 Single 1.7V to 5.5V V_CC supply voltage
 JEDEC EE1002 and EE1002A Serial Presence Detect (SPD) compliant
̶ EEPROM specification for use in DDR, DDR2, and DDR3 DIMM modules
 I²C-compatible (2-wire) serial interface
̶ 400kHz (1.7V, 2.5V) and 1MHz (5.0V) compatibility
 Multiple EEPROM data protection schemes
̶ Permanent and reversible software write protection for the lower 128 bytes
̶ Hardware write protection for the entire array
 Schmitt Trigger filtered inputs for noise suppression
 16-byte page write modes
̶ Partial page writes are allowed
 Self-timed write cycle (5ms maximum)
 High-reliability
̶ Endurance: 1,000,000 write cycles
̶ Data retention: 100 years
 8-pad 2x3mm UDFN, 8-lead TSSOP, 8-lead JEDEC SOIC, and
8-ball VFBGA packages
 Die sales: wafer form, tape and reel, and bumped wafers are available
Description
The Atmel^® AT34C02D is designed to support the JEDEC EE1002 and EE1002A
Serial Presence Detect (SPD) function used in DDR, DDR2, and DDR3 Dual Inline
Memory Modules (DIMM). The AT34C02D provides 2,048 bits of Serial
Electrically-Erasable and Programmable Read Only Memory (EEPROM) organized
as 256 words of 8 bits each. The device also incorporates a permanent and
reversible software write protection feature for the lower 128 bytes of the EEPROM.
Once the permanent software write protection is enabled, it cannot be reversed.
However, the reversible software write protection can be enabled or disabled by
sending a specific command and protocol sequence. A hardware write protection
function is also available and is controlled by the WP pin state. It can be used to
protect the entire EEPROM contents regardless of whether or not the software write
protection has been enabled. The software and hardware write protection features
allow the user the flexibility to protect none, lower-half, or the entire memory array
depending on the specific needs of the application. The device is optimized for use
in many industrial and commercial applications where low-power and low-voltage
operations are essential. The AT34C02D is available in space saving 8-pad 2x3mm
UDFN, 8-lead TSSOP, 8-lead JEDEC SOIC, and 8-ball VFBGA packages and is
accessed via an I²C-compatible 2-wire serial interface. The AT34C02D operates
over a wide V_CC range, from 1.7V to 5.5V.
Atmel-8781C-SEEPROM-AT34C02D-Datasheet_072014