24LC21-I/SN Microchip Technology, 24LC21-I/SN Datasheet - Page 8

• Manufacturer Part Number: 24LC21-I/SN
• Description: IC EEPROM 1KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LC21-I/SN

• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Memory Size: 1K (128 x 8)
• Speed: 100kHz, 400kHz
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

24LC21
It is required that V
order to program the device. This applies to byte write
and page write operation. Note that V
while the device is in its self-timed program operation
and not affect programming.
FIGURE 4-1:
FIGURE 4-2:
DS21095J-page 8
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
V
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
V
Note:
CLK
CLK
Page write operations are limited to writing
bytes within a single physical page,
regardless of the number of bytes
actually being written. Physical page
boundaries start at addresses that are
integer multiples of the page buffer size (or
‘page size’) and end at addresses that are
integer multiples of [page size - 1]. If a
page Write command attempts to write
across a physical page boundary, the
result is that the data wraps around to the
beginning of the current page (overwriting
data previously stored there), instead of
being written to the next page as might be
expected. It is therefore necessary for the
application software to prevent page write
operations that would attempt to cross a
page boundary.
CLK
S
S
S
T
A
R
T
S
T
A
R
T
BYTE WRITE
BYTE WRITE
be held at a logic high level in
Control
Control
Byte
Byte
CLK
can go low
A
C
K
A
C
K
Address
Address
Word
Word
A
C
K
A
C
K
 2004 Microchip Technology Inc.
Data
Data
A
C
K
A
C
K
P
P
S
T
O
P
S
T
O
P