24LC08B-E/SN Microchip Technology, 24LC08B-E/SN Datasheet - Page 7

• Manufacturer Part Number: 24LC08B-E/SN
• Description: IC EEPROM 8KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LC08B-E/SN

• Memory Size: 8K (4 x 256 x 8)
• Package / Case: 8-SOIC (3.9mm Width)
• Operating Temperature: -40°C ~ 125°C
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Organization: 4 Block x 256 x 8
• Interface Type: I2C
• Maximum Clock Frequency: 0.4 MHz
• Access Time: 900 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.5 V
• Maximum Operating Current: 3 mA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.5 V, 5.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 24LC08BE/SN

5.0
A control byte is the first byte received following the
Start condition from the master device (Figure 5-1).
The control byte consists of a four-bit control code. For
the 24XX08, this is set as ‘
write operations. The next three bits of the control byte
are the block-select bits (B2, B1, B0). B2 is a “don’t
care” for the 24XX08. They are used by the master
device to select which of the four 256 word-blocks of
memory are to be accessed. These bits are in effect the
three Most Significant bits of the word address.
The last bit of the control byte defines the operation to
be performed. When set to ‘
selected. When set to ‘
Following the Start condition, the 24XX08 monitors the
SDA bus, checking the device type identifier being
transmitted and, upon receiving a ‘
slave device outputs an Acknowledge signal on the
SDA line. Depending on the state of the R/W bit, the
24XX08 will select a read or write operation.
FIGURE 5-2:
© 2009 Microchip Technology Inc.
Operation
Read
Write
DEVICE ADDRESSING
Control
x = “don’t care”
1010
1010
Code
1
Control
Code
0
ADDRESS SEQUENCE BIT ASSIGNMENTS
0
’ a write operation is selected.
1
Control Byte
1010’
Block Address
Block Address
Block Select
0
1
’ a read operation is
X
binary for read and
Select
1010’
Block
bits
B1 B0 R/W
code, the
R/W
1
0
FIGURE 5-1:
A
7
Start Bit
x = “don’t care”
S
•
Address Low Byte
24AA08/24LC08B
•
1
Control Code
•
0
•
Slave Address
1
•
CONTROL BYTE
ALLOCATION
0
•
x
A
0
Select
Block
Bits
B1 B0 R/W ACK
Acknowledge Bit
Read/Write Bit
DS21710J-page 7