24LC21A/SN Microchip Technology, 24LC21A/SN Datasheet - Page 8

• Manufacturer Part Number: 24LC21A/SN
• Description: IC EEPROM 1KBIT 400KHZ 8SOIC
• Manufacturer: Microchip Technology

Specifications of 24LC21A/SN

• Memory Size: 1K (128 x 8)
• Format - Memory: EEPROMs - Serial
• Memory Type: EEPROM
• Speed: 100kHz, 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: 128 X 8 / 64 X 16
• 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

24LC21A
FIGURE 3-5:
FIGURE 3-6:
3.1.6
After generating a Start condition, the bus master
transmits the slave address consisting of a 7-bit device
code (1010000) for the 24LC21A.
The eighth bit of slave address determines whether the
master device wants to read or write to the 24LC21A
(Figure 3-7).
The 24LC21A monitors the bus for its corresponding
slave
Acknowledge bit if the slave address was true and it is
not in a programming mode.
DS21160G-page 8
Operation
SCL
SDA
SDA
IN
SDA
OUT
SCL
Read
Write
T
address
SU
:
T
STA
SLAVE ADDRESS
SU
:
STA
T
continuously.
SP
Slave Address
BUS TIMING START/STOP
BUS TIMING DATA
T
Start
AA
1010000
1010000
T
F
T
HD
T
:
T
It
STA
LOW
HD
:
STA
generates
T
T
HIGH
HD
R/W
1
0
:
DAT
an
T
AA
FIGURE 3-7:
V
HYS
T
1
SU
Start
:
DAT
0
T
T
SU
SU
:
STO
:
1
STO
Slave Address
CONTROL BYTE
ALLOCATION
© 2008 Microchip Technology Inc.
0
T
R
Stop
0
Read/Write
T
BUF
0
R/W
0
A