X4043/45
The memory portion of the device is a CMOS Serial
EEPROM array with Xicor’s block lock protection. The
array is internally organized as x 8. The device features
an 2-wire interface and software protocol allowing
operation on an I2C bus.
PIN CONFIGURATION
8-Pin JEDEC SOIC, MSOP, PDIP
V
1
2
3
4
8
7
6
5
NC
NC
CC
WP
SCL
SDA
The device utilizes Xicor’s proprietary Direct Write™
cell, providing a minimum endurance of 1,000,000
cycles and a minimum data retention of 100 years.
RESET
V
SS
Pin
(SOIC/MSOP/DIP)
Name
NC
Function
1
2
3
No internal connections
No internal connections
NC
RESET/ Reset Output. RESET is an active LOW, open drain output which goes active
RESET whenever V falls below V . It will remain active until V rises above the V
TRIP
CC
TRIP
CC
for t
. RESET/RESET goes active if the Watchdog Timer is enabled and SDA
PURST
remains either HIGH or LOW longer than the selectable Watchdog time out period.
RESET/RESET goes active on power up and remains active for 250ms after the
power supply stabilizes. RESET is an active high open drain output. An external pull
up resistor is required on the RESET/RESET pin.
4
5
V
Ground
SS
SDA
Serial Data. SDA is a bidirectional pin used to transfer data into and out of the
device. It has an open drain output and may be wire ORed with other open drain or
open collector outputs. This pin requires a pull up resistor and the input buffer is
always active (not gated).
6
7
8
SCL
WP
Serial Clock. The Serial Clock input controls the serial bus timing for data input and
output.
Write Protect. WP HIGH prevents writes to any location in the device (including the
control register). Connect WP pin to V when it is not used.
SS
V
Supply Voltage
CC
Characteristics subject to change without notice. 2 of 25
REV 1.1.17 9/14/01
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XICOR [ XICOR INC. ]
