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X24257BI-2.5

Description
400kHz 2-Wire Serial EEPROM with Block Lock
Categoryaccessories   
File Size502KB,19 Pages
ManufacturerXicon Passive Components
Websitehttp://www.xicor.com
Download Datasheet View All

X24257BI-2.5 Overview

400kHz 2-Wire Serial EEPROM with Block Lock

Preliminary Information
256K
X24257
400kHz 2-Wire Serial EEPROM with Block Lock
DESCRIPTION
32K x 8 Bit
FEATURES
• Save critical data with programmable block lock
protection
—Block lock (first page, first 2 pages, first 4
pages, first 8 pages, 1/4, 1/2, or all of EEPROM
array)
—Software write protection
—Programmable hardware write protect
• In circuit programmable ROM mode
• 400kHz 2-wire serial interface
—Schmitt trigger input noise suppression
—Output slope control for ground bounce noise
elimination
• Longer battery life with lower power
—Active read current less than 1µA
—Active write current less than 3µA
—Standby current less than 1µA
• 2.5V to 5.5V power supply
• 64-byte page write mode
—Minimizes total write time per word
• Internally organized 32K x 8
• Bidirectional data transfer protocol
• Self-timed write cycle
—Typical write cycle time of 5ms
• High reliability
—Endurance: 100,000 cycles
—Data retention: 100 years
• 8-lead XBGA, 8-lead SOIC, 14-lead TSSOP
Three device select inputs (S
0
–S
1
) allow up to four
devices to share a common two wire bus.
A Write Protect Register at the highest address location,
FFFFh, provides three write protection features: Software
Write Protect, Block Lock Protect, and Programmable
Hardware Write Protect. The Software Write Protect
feature prevents any nonvolatile writes to the device
until the WEL bit in the Write Protect Register is set.
The Block Lock Protection feature gives the user eight
array block protect options, set by programming three
bits in the Write Protect Register. The Programmable
Hardware Write Protect feature allows the user to
install the device with WP tied to V
CC
, write to and
Block Lock the desired portions of the memory array in
circuit, and then enable the In Circuit Programmable
ROM Mode by programming the WPEN bit HIGH in the
Write Protect Register. After this, the Block Locked
portions of the array, including the Write Protect Register
itself, are protected from being erased if WP is high.
Xicor EEPROMs are designed and tested for applica-
tions requiring extended endurance. Inherent data
retention is greater than 100 years.
BLOCK DIAGRAM
bs
ol
et
e
P
ro
Page
Decode
Logic
Write
Protect
Register
Serial EEPROM Data
and Address (SDA)
SCL
Command
Decode
and
Control
Logic
Block Lock and
Write Protect
Control Logic
S
1
S
0
Device
Select
Logic
O
WP
du
c
Data Register
Y Decode Logic
Serial EEPROM
Array
32K X 8
Write Voltage
Control
The X24257 is a CMOS Serial EEPROM, internally
organized 32K x 8. The device features a serial inter-
face and software protocol allowing operation on a
simple two wire bus.
REV 1.1.1 10/15/00
www.xicor.com
Characteristics subject to change without notice.
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Datasheet   0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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