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24AA025TIMS Datasheet(PDF) 4 Page - Microchip Technology

Part # 24AA025TIMS
Description  2K I2C Serial EEPROM
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

24AA025TIMS Datasheet(HTML) 4 Page - Microchip Technology

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24AA024/24LC024/24AA025/24LC025
DS21210G-page 4
 2004 Microchip Technology Inc.
2.0
PIN DESCRIPTIONS
2.1
SDA Serial Data
SDA is a bidirectional pin used to transfer addresses
and data into and out of the device. It is an open-drain
terminal, therefore the SDA bus requires a pull-up
resistor to VCC (typical 10 k
Ω for 100 kHz, 2 kΩ for
400 kHz).
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating the Start and Stop conditions.
2.2
SCL Serial Clock
The SCL input is used to synchronize the data transfer
from and to the device.
2.3
A0, A1, A2
The levels on the A0, A1 and A2 inputs are compared
with the corresponding bits in the slave address. The
chip is selected if the compare is true.
Up to eight 24AA024/24LC024/24AA025/24LC025
devices may be connected to the same bus by using
different Chip Select bit combinations. These inputs
must be connected to either VCC or VSS.
2.4
WP (24XX024 Only)
WP is the hardware write-protect pin. It must be tied to
VCC or VSS. If tied to Vcc, hardware write protection is
enabled. If WP is tied to Vss, the hardware write
protection is disabled. Note that the WP pin is available
only on the 24XX024. This pin is not internally
connected on the 24LC025.
2.5
Noise Protection
The 24AA024/24LC024/24AA025/24LC025 employs a
VCC threshold detector circuit which disables the inter-
nal erase/write logic if the VCC is below 1.5 volts at
nominal conditions.
The SCL and SDA inputs have Schmitt Trigger and
filter circuits which suppress noise spikes to assure
proper device operation, even on a noisy bus.
3.0
FUNCTIONAL DESCRIPTION
The 24AA024/24LC024/24AA025/24LC025 supports
a bidirectional, 2-wire bus and data transmission
protocol. A device that sends data onto the bus is
defined as transmitter, while a device receiving data
is defined as receiver. The bus has to be controlled
by a master device which generates the serial clock
(SCL), controls the bus access and generates the
Start and Stop conditions, while the 24AA024/
24LC024/24AA025/24LC025 works as slave. Both
master and slave can operate as transmitter or
receiver, but the master device determines which
mode is activated.


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