24AA64_07 Datasheet, PDF (12/28 Pages) Microchip Technology – 64K I2C™ Serial EEPROM

24AA64/24LC64/24FC64
7.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 7-1.
TABLE 7-1: PIN FUNCTION TABLE
Name
A0
A1
A2
VSS
SDA
SCL
WP
VCC
PDIP
1
2
3
4
5
6
7
8
SOIC
1
2
3
4
5
6
7
8
TSSOP
1
2
3
4
5
6
7
8
DFN
1
2
3
4
5
6
7
8
MSOP
1
2
3
4
5
6
7
8
Description
Chip Address Input
Chip Address Input
Chip Address Input
Ground
Serial Address/Data I/O
Serial Clock
Write-Protect Input
+1.7V to 5.5V Power Supply
7.1 A0, A1, A2 Chip Address Inputs
The A0, A1 and A2 inputs are used by the 24XX64 for
multiple device operation. The levels on these inputs
are compared with the corresponding bits in the slave
address. The chip is selected if the compare is true.
Up to eight 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.
In Most applications, the chip address inputs A0, A1
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.
7.2 Serial Data (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 kΩ 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.
7.3 Serial Clock (SCL)
The SCL input is used to synchronize the data transfer
from and to the device.
7.4 Write-Protect (WP)
This pin must be connected to either VSS or VCC. If tied
to VSS, write operations are enabled. If tied to VCC,
write operations are inhibited but read operations are
not affected.
DS21189L-page 12
© 2007 Microchip Technology Inc.