24AA02/24LC02B
8.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 8-1.
TABLE 8-1:
Name
PIN FUNCTION TABLE
PDIP
SOIC
TSSOP
DFN
MSOP
SOT23
Description
Not Connected
A0
A1
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
—
—
—
2
Not Connected
A2
Not Connected
VSS
SDA
SCL
WP
VCC
Ground
3
Serial Address/Data I/O
Serial Clock
1
5
Write-Protect Input
+1.7V to 5.5V Power Supply
4
8.1
Serial Address/Data Input/Output
(SDA)
8.3
Write-Protect (WP)
The WP pin must be connected to either VSS or VCC.
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 kΩ for 100 kHz, 2 kΩ for 400 kHz).
If tied to VSS, normal memory operation is enabled
(read/write the entire memory 00-FF).
If tied to VCC, write operations are inhibited. The entire
memory will be write-protected. Read operations are
not affected.
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.
This feature allows the user to use the 24XX02 as a
serial ROM when WP is enabled (tied to VCC).
8.2
Serial Clock (SCL)
8.4
A0, A1, A2
The SCL input is used to synchronize the data transfer
to and from the device.
These A0, A1 and A2 pins are not used by the 24XX02.
They may be left floating or tied to either VSS or VCC.
© 2007 Microchip Technology Inc.
DS21709G-page 11
MICROCHIP [ MICROCHIP ]
