24LC08BH-E/ST Microchip Technology, 24LC08BH-E/ST Datasheet - Page 6

• Manufacturer Part Number: 24LC08BH-E/ST
• Description: 8K, 1K X 8 2.5V SERIAL EE, EXT, 1/2 ARRAY WP 8 TSSOP 4.4mm TUBE
• Manufacturer: Microchip Technology

Specifications of 24LC08BH-E/ST

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 8K (4 x 256 x 8)
• Speed: 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24AA08H/24LC08BH
3.6
A control byte is the first byte received following the
Start condition from the master device (Figure 3-2).
The control byte consists of a four-bit control code. For
the 24XX08H, 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 24XX08H. 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 24XX08H 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
24XX08H will select a read or write operation.
DS22084A-page 6
Operation
Read
Write
Device Addressing
Control
1010
1010
Code
0
’ a write operation is selected.
1010’
Block Address
Block Address
Block Select
1
’ a read operation is
binary for read and
1010’
code, the
R/W
1
0
FIGURE 3-2:
Start Bit
x = “don’t care”
S
1
Control Code
0
Slave Address
1
CONTROL BYTE
ALLOCATION
0
© 2008 Microchip Technology Inc.
x
Select
Block
Bits
B1 B0 R/W ACK
Acknowledge Bit
Read/Write Bit