X24645 Datasheet, PDF (2/18 Pages) Xicor Inc. – Advanced 2-Wire Serial E 2 PROM with Block Lock TM Protection

X24645
Xicor E²PROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data
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
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 (S₁, S₂)
The device select inputs (S₁, S₂) 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
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
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
S₁, S₂
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
PIN CONFIGURATIONS
8-LEAD DIP & SOIC
NC
S1
S2
VSS
1
8
2
7
X24645
3
6
4
5
VCC
WP
SCL
SDA
NC
NC
NC
S1
S2
VSS
NC
14-LEAD SOIC
1
14
2
13
3
12
4 X24645 11
5
10
6
9
7
8
NC
NC
VCC
WP
SCL
SDA
NC
NC
NC
S1
NC
NC
NC
S2
VSS
NC
NC
20-LEAD TSSOP
1
20
2
19
3
18
4
17
5 _X24645 16
6
15
7
14
8
13
9
12
10
11
NC
VCC
WP
NC
NC
NC
SCL
SDA
NC
NC
2783 ILL F02.4
2