X24645
2
Xicor E PROMs are designed and tested for applica-
PIN CONFIGURATIONS
tions requiring extended endurance. Inherent data
retention is greater than 100 years.
8-LEAD DIP & SOIC
NC
1
2
3
4
8
7
6
5
V
CC
PIN DESCRIPTIONS
Serial Clock (SCL)
S
1
S
2
WP
X24645
SCL
SDA
The SCL input is used to clock all data into and out of
the device.
V
SS
Serial Data (SDA)
14-LEAD SOIC
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.
NC
NC
NC
NC
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
V
CC
WP
SCL
SDA
NC
S
1
S
2
X24645
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.
V
SS
NC
8
Device Select (S , S )
1
2
20-LEAD TSSOP
The device select inputs (S , S ) are used to set the
1
2
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
NC
NC
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
V
CC
S
1
WP
used statically they must be tied to V
or V
as
SS
CC
NC
NC
NC
NC
appropriate. If actively driven, they must be driven with
CMOS levels (driven to V or V ).
NC
X24645
CC
SS
NC
Write Protect (WP)
SCL
SDA
NC
S
2
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
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.
V
SS
NC
NC
NC
2783 ILL F02.4
PIN NAMES
Symbol
Description
Device Select Inputs
S1, S2
SDA
SCL
WP
Serial Data
Serial Clock
Write Protect
Ground
VSS
VCC
NC
Supply Voltage
No Connect
2783 FRM T01.1
2
XICOR [ XICOR INC. ]
