24AA02UID Datasheet, PDF (6/30 Pages) Microchip Technology – 2K I2C™ Serial EEPROMs with Unique 32-bit Serial Number

24AA02UID/24AA025UID
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Name
PDIP
SOIC
5-Pin SOT-23
6-Pin SOT-23
Description
A0
1
1
—
A1
2
2
—
A2
3
3
—
5
Chip Address Input⁽¹⁾
4
Chip Address Input⁽¹⁾
—
Chip Address Input⁽¹⁾
VSS
4
4
2
2
Ground
SDA
5
5
3
3
Serial Address/Data I/O
SCL
6
6
1
1
Serial Clock
NC
7
7
5
—
Not Connected
VCC
8
8
4
6
+1.7V to 5.5V Power Supply
Note 1: Chip address inputs A0, A1 and A2 are not connected on the 24AA02UID.
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 VCC (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
24AA02UID. They may be left floating or tied to either
VSS or VCC.
For the 24AA025UID, 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 con-
nected and its corresponding bit in the slave address
should always be set to ‘0’.
Up to eight 24AA025UID 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 VSS or VCC.
DS20005202A-page 6
 2013 Microchip Technology Inc.