AT24MAC402-SSHM-T Atmel, AT24MAC402-SSHM-T Datasheet - Page 2

• 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

Description
The Atmel AT24MAC402 and AT24MAC602 provides 2048 bits of Serial Electrically-Erasable Programmable Read-Only
Memory (EEPROM) organized as 256 words of eight bits each and is accessed via an I
interface. In addition, AT24MAC402/602 incorporates an easy and inexpensive method to obtain a globally unique MAC
or EUI address (EUI-48 or EUI-64). AT24MAC402 is an EUI-48 compatible device that contains a 48-bit EUI address,
and AT24MAC602 is an EUI-64 compatible device that contains a 64-bit EUI address.
The EUI-48 and EUI-64 addresses can be assigned as the actual physical address of a system hardware device or node
or it can be assigned to a software instance. These addresses are factory programmed by Atmel and permanently write
protected in an extended memory block located outside of the standard 2-Kbit bit memory array.
In addition, the AT24MAC402/602 provides the value added feature of a factory-programmed, guaranteed unique 128-bit
serial number located in the extended memory block (same area as the EUI address values). The serial number is Atmel
factory-programmed and permanently write protected. This 128-bit serial number is compatible with all AT24CS,
AT93CS, and AT25S family serial numbers, therefore, providing guaranteed unique serial numbers for any application
that is also using Atmel Serial EEPROMs.
The first-half of the AT24MAC402/602 incorporates a permanent and a reversible software write protection feature while
a hardware write protect feature for the entire array is available via an external pin. The permanent software write
protection is enabled by sending a special command to the device. This protection cannot be reversed once executed.
However, the reversible software write protection can be reversed by sending and executing a special command. The
hardware write protection is controlled by the WP pin state and can be used to protect the entire array 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 no portion of the memory, the first-half of the memory, 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 AT24MAC402/602 is available in space saving 8-lead JEDEC SOIC, 8-lead TSSOP,
8-pad UDFN, and 5-lead SOT23 packages. Both devices operate across a wide supply voltage range from
1.7V to 5.5V V
Figure 1.
Note:
Pin Name
A
SDA
SCL
WP
GND
V
0
CC
- A
2
For use of the 5-lead SOT23, the software A2, A1, and A0 bits in the device address word must be set to zero to
properly communicate with the device since the A
not possible due to these pins not being available. See
Pin Configurations
CC
Function
Address Inputs
Serial Data
Serial Clock Input
Write Protect
Ground
Power Supply
.
Atmel AT24MAC402/602 [PRELIMINARY DATASHEET]
GND
A
A
A
0
1
2
SDA
2
SCL
V
WP
, A
CC
8-pad UDFN
Bottom View
8-lead SOIC
1
, and A
1
2
3
4
“Write Protection” on page 11
8
7
6
5
0
1
2
3
4
8
7
6
5
pins are not bonded out. Some functionality is
A
A
A
GND
0
1
2
V
WP
SCL
SDA
CC
2
GND
SDA
SCL
C-compatible (2-wire) serial
GND
A
A
A
0
1
2
8-lead TSSOP
5-lead SOT23
for more details.
8807B–SEEPR–9/2012
1
2
3
1
2
3
4
8
7
6
5
5
4
V
WP
SCL
SDA
WP
V
CC
CC
2