X24325
PIN DESCRIPTIONS
Serial Clock (SCL)
The SCL input is used to clock all data into and out of
the device.
Serial Data (SDA)
SDA is a bidirectional pin used to transfer data into
and out of the device. It is an open drain output and
may be wire-ORed with any number of open drain or
open collector outputs.
An open drain output requires the use of a pull-up
resistor. For selecting typical values, refer to the Pull-
Up Resistor selection graph at the end of this data
sheet.
Device Select (S
0
, S
1
, S
2
)
The device select inputs (S
0
, S
1
, S
2
) are used to set
the first three bits of the 8-bit slave address. This
allows up to eight X24325’s to share a common bus.
These inputs can be static or actively driven. If used
statically they must be tied to V
SS
or V
CC
as appro-
priate. If actively driven, they must be driven with
CMOS levels (driven to V
CC
or V
SS
).
Write Protect (WP)
The write protect input controls the hardware write
protect feature. When held LOW, hardware write
protection is disabled and the X24325 can be written
normally. When this input is held HIGH, and the WPEN
bit in the write protect register is set HIGH, write
protection is enabled, and nonvolatile writes are
disabled to the selected blocks as well as the write
protect register itself.
PIN NAMES
Symbol
S
0
, S
1
,
S
2
SDA
SCL
WP
V
SS
V
CC
NC
PIN CONFIGURATIONS
8-LEAD DIP & SOIC
S0
S1
S2
VSS
1
2
3
4
X24325
8
7
6
5
VCC
WP
SCL
SDA
14-LEAD TSSOP
S0
S1
NC
NC
NC
S2
VSS
1
2
3
4
5
6
7
14
13
12
X24325
11
10
9
8
VCC
WP
NC
NC
NC
SCL
SDA
6552 ILL F02.5
Description
Device Select Inputs
Serial Data
Serial Clock
Write Protect
Ground
Supply Voltage
No Connect
6552 FRM T01.1
2
XICOR [ XICOR INC. ]
