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24AA256/24LC256/24FC256
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Name
A0
A1
(NC)
A2
V SS
SDA
SCL
(NC)
WP
V CC
8-pin
PDIP
1
2
—
3
4
5
6
—
7
8
8-pin
SOIC
1
2
—
3
4
5
6
—
7
8
8-pin
TSSOP
1
2
—
3
4
5
6
—
7
8
8-pin
MSOP
—
—
1, 2
3
4
5
6
—
7
8
8-pin
DFN
1
2
—
3
4
5
6
—
7
8
CS
3
2
—
5
8
6
7
—
4
1
Function
User Configurable Chip Select
User Configurable Chip Select
Not Connected
User Configurable Chip Select
Ground
Serial Data
Serial Clock
Not Connected
Write-Protect Input
+1.7V to 5.5V (24AA256)
+2.5V to 5.5V (24LC256)
+1.7V to 5.5V (24FC256)
2.1
A0, A1, A2 Chip Address Inputs
2.3
Serial Clock (SCL)
The A0, A1 and A2 inputs are used by the 24XX256 for
multiple device operations. The levels on these inputs
are compared with the corresponding bits in the slave
This input is used to synchronize the data transfer to
and from the device.
address. The chip is selected if the compare is true.
2.4
Write-Protect (WP)
For the MSOP package only, pins A0 and A1 are not
connected.
Up to eight devices (two for the MSOP package) may
be connected to the same bus by using different Chip
Select bit combinations. These inputs must be
This pin must be connected to either V SS or V CC . If tied
to V SS , write operations are enabled. If tied to V CC ,
write operations are inhibited but read operations are
not affected.
connected to either V CC or V SS .
In most applications, the chip address inputs A0, A1
3.0
FUNCTIONAL DESCRIPTION
and A2 are hard-wired to logic ‘ 0 ’ or logic ‘ 1 ’. For
applications in which these pins are controlled by a
microcontroller or other programmable device, the chip
address pins must be driven to logic ‘ 0 ’ or logic ‘ 1 ’
before normal device operation can proceed.
The 24XX256 supports a bidirectional 2-wire bus and
data transmission protocol. A device that sends data
onto the bus is defined as a transmitter and a device
receiving data as a receiver. The bus must be
controlled by a master device which generates the
Serial Clock (SCL), controls the bus access, and
2.2
Serial Data (SDA)
generates the Start and Stop conditions while the
24XX256 works as a slave. Both master and slave can
This 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 V CC (typical 10 k ? for 100 kHz, 2 k ?? for
400 kHz and 1 MHz).
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.
? 1998-2011 Microchip Technology Inc.
operate as a transmitter or receiver, but the master
device determines which mode is activated.
DS21203R-page 5
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