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24AA02E48/24AA025E48
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Name
A0
A1
A2
V SS
SDA
SCL
NC
V CC
SOIC
1
2
3
4
5
6
7
8
5-Pin SOT-23
—
—
—
2
3
1
5
4
6-Pin SOT-23
5
4
—
2
3
1
—
6
Description
Chip Address Input (1)
Chip Address Input (1)
Chip Address Input (1)
Ground
Serial Address/Data I/O
Serial Clock
Not Connected
+1.7V to 5.5V Power Supply
Note 1:
Chip address inputs A0, A1 and A2 are not connected on the 24AA02E48.
2.1
Serial Address/Data Input/Output
(SDA)
SDA is a bidirectional pin used to transfer addresses
and data into and out of the device. Since it is an open-
drain terminal, the SDA bus requires a pull-up resistor
to V CC (typical 10 k ? for 100 kHz, 2 k ? for 400 kHz).
For normal data transfer, SDA is allowed to change
only during SCL low. Changes during SCL high are
reserved for indicating Start and Stop conditions.
2.2
Serial Clock (SCL)
The SCL input is used to synchronize the data transfer
to and from the device.
2.3
A0, A1, A2 Chip Address Inputs
The A0, A1 and A2 pins are not used by the
24AA02E48. They may be left floating or tied to either
V SS or V CC .
For the 24AA025E48, 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. For the 6-lead SOT-23 package, pin A2 is not
connected and its corresponding bit in the slave
address should always be set to ‘ 0 ’.
Up to eight 24AA025E48 devices (four for the SOT-23
package) may be connected to the same bus by using
different Chip Select bit combinations. These inputs
must be connected to either V SS or V CC .
DS22124D-page 6
? 2010 Microchip Technology Inc.
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