24LC04B/SN Microchip Technology, 24LC04B/SN Datasheet - Page 7

• Manufacturer Part Number: 24LC04B/SN
• Description: IC EEPROM 4KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LC04B/SN

• Memory Size: 4K (2 x 256 x 8)
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 8-SOIC (3.9mm Width)
• Memory Configuration: 2 BLK(256 X 8)
• Ic Interface Type: I2C
• Clock Frequency: 400kHz
• Supply Voltage Range: 2.5V To 5.5V
• Memory Case Style: SOIC
• No. Of Pins: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

5.0
A control byte is the first byte received following the
Start condition from the master device. The control byte
consists of a four-bit control code. For the 24XX04, this
is set as ‘
The next two bits of the control byte are “don’t cares” for
the 24XX04. The last bit, B0, is used by the master
device to select which of the two 256-word blocks of
memory are to be accessed. This bit is, in effect, the
Most Significant bit 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 24XX04 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
24XX04 will select a read or write operation.
FIGURE 5-2:
© 2009 Microchip Technology Inc.
DEVICE ADDRESSING
1010
’ binary for read and write operations.
x = “don’t care”
1
Control
Code
0
0
ADDRESS SEQUENCE BIT ASSIGNMENTS
’, a write operation is selected.
1
Control Byte
0
1
’, a read operation is
x
Select
Block
1010
bits
x
B
0 R/W
’ code, the
FIGURE 5-1:
A
7
Operation
Start Bit
x = “don’t care”
Read
Write
•
S
Address Low Byte
24AA04/24LC04B
•
1
Control Code
•
0
Control
•
1010
1010
Code
Slave Address
1
•
CONTROL BYTE
ALLOCATION
0
•
A
0
x
Block Address
Block Address
Block Select
Select
Block
Bits
x
Acknowledge Bit
Read/Write Bit
B0 R/W ACK
DS21708K-page 7
R/W
1
0