AT24MAC402-SSHM-T Atmel, AT24MAC402-SSHM-T Datasheet - Page 6

• Manufacturer Part Number: AT24MAC402-SSHM-T
• Description: EEPROM 2-Kbit Serial EEPROM
• Manufacturer: Atmel

Specifications of AT24MAC402-SSHM-T

• Rohs: yes
• Memory Size: 2 Kbit
• Organization: 256 B x 8
• Data Retention: 100 yr
• Maximum Clock Frequency: 1000 KHz
• Maximum Operating Current: 6 uA
• Operating Supply Voltage: 1.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8

3.
Memory Organization
Atmel AT24MAC402/602, 2K Serial EEPROM: The 2-Kbit memory array is internally organized as 16 pages of 16 bytes
of EEPROM each. Random word addressing requires a 8-bit data word address.
EUI Address and Serial Number: The 48-bit EUI address in the AT24MAC402 and the 64-bit EUI address in the
AT24MAC602 are located in the extended memory block. In addition, the serial number data is also located in the
extended memory block as shown below in
read-only EEPROM memory block located outside the standard 2K memory array as shown below. This means the full
standard 2-Kbit EEPROM array is available for use as opposed to solutions where only half of the EEPROM memory
array is available for application usage.
Figure 3-1. Memory Organization
The EUI-48 and EUI-64 address fields contain either six or eight bytes respectively. The first three bytes of the EUI
read-only address field are called the Organizationally Unique Identifier (OUI) and the IEEE Registration Authority has
assigned FCC23Dh as the Atmel, OUI.
Following the OUI, the remaining bytes are called the Extension Identifier and will be either three bytes or five bytes
depending on if it is an EUI-48 address (AT24MAC402) or EUI-64 address (AT24MAC602). Atmel generates this unique
24-bit/40-bit data value along with the OUI to guarantee a globally unique EUI address value and programs it at the
factory before permanently locking the extended memory region.
EEPROM
Device Address
Extended
Device Address
Standard
Memory
2-Kbit
‘1010’
‘1011’
Figure
128-bit Serial Number
EUI-48 Address Range (9Ah-9Fh)
EUI-64 Address Range (98h-9Fh)
Address Range (00h-7Fh)
Address Range (80h-FFh)
Address Range (80h-8Fh)
EUI-48/64 Value
3-1. These EUI-48 or EUI-64 addresses are stored in a dedicated
Atmel AT24MAC402/602 [PRELIMINARY DATASHEET]
Second-half
First-half
Reversible Software
Full Array Hardware
Full Array Hardware
Write Protection
Write Protection
Write Protection
Permanent or
Read-only
Read-only
Capable
Capable
Capable
or
8807B–SEEPR–9/2012
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