X24645
ICmic E PROMs are designed and tested for applications
requiring extended endurance. Inherent data
2
PIN CONFIGURATIONS
8-LEAD DIP & SOIC
NC
1
2
3
4
8
7
6
5
V
CC
retention is greater than 100 years.
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
S
1
S
2
V
SS
X24645
WP
SCL
SDA
14-LEAD SOIC
NC
NC
V
CC
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
1
, S
2
)
The device select inputs (S
1
, S
2
) are used to set the first
and second bits of the 8-bit slave address. This
allows up to four X24645 devices 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
appropriate. If actively driven, they must be driven with
NC
NC
1
2
3
4
5
6
14
13
12
X24645
11
NC
S
1
S
2
V
SS
NC
7
10
9
8
WP
SCL
SDA
NC
20-LEAD TSSOP
NC
NC
S
1
NC
NC
1
2
3
4
20
19
NC
V
CC
18
17
X24645
16
15
14
13
12
11
WP
NC
NC
NC
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 X24645 can be written
normally. When this input is held HIGH, and the WPEN
5
6
7
8
9
10
NC
S
2
V
SS
SCL
SDA
NC
NC
NC
NC
2783 ILL F02.4
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
1
,
S
2
SDA
SCL
WP
V
SS
V
CC
NC
Description
Device Select Inputs
Serial Data
Serial Clock
Write Protect
Ground
Supply Voltage
No Connect
2783 FRM T01.1
2
ICMIC [ IC MICROSYSTEMS ]
