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24C256 Datasheet PDF : 18 Pages
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CAT24C256
256 kb I2C CMOS Serial
EEPROM
Description
The CAT24C256 is a 256 kb Serial CMOS EEPROM, internally
organized as 32,768 words of 8 bits each.
It features a 64−byte page write buffer and supports the Standard
(100 kHz), Fast (400 kHz) and Fast−Plus (1 MHz) I2C protocol.
Write operations can be inhibited by taking the WP pin High (this
protects the entire memory).
External address pins make it possible to address up to eight
CAT24C256 devices on the same bus.
On−Chip ECC (Error Correction Code) makes the device suitable
for high reliability applications.*
Features
• Supports Standard, Fast and Fast−Plus I2C Protocol
• 1.8 V to 5.5 V Supply Voltage Range
• 64−Byte Page Write Buffer
• Hardware Write Protection for Entire Memory
• Schmitt Triggers and Noise Suppression Filters on I2C Bus Inputs
(SCL and SDA)
• Low Power CMOS Technology
• 1,000,000 Program/Erase Cycles
• 100 Year Data Retention
• Industrial and Extended Temperature Range
• PDIP, SOIC, TSSOP, MSOP 8−Lead and
TDFN, UDFN 8−Pad Packages
• This Device is Pb−Free, Halogen Free/BFR Free, and RoHS
Compliant
VCC
SCL
A2, A1, A0
WP
CAT24C256
SDA
VSS
Figure 1. Functional Symbol
* Available for New Product (Rev. E)
© Semiconductor Components Industries, LLC, 2014
1
January, 2014 − Rev. 14
http://onsemi.com
TDFN−8**
ZD2 SUFFIX
CASE 511AM
TSSOP−8
Y SUFFIX
CASE 948AL
PDIP−8
L SUFFIX
CASE 646AA
SOIC−8
X SUFFIX
CASE 751BE
SOIC−8
W SUFFIX
CASE 751BD
UDFN−8
HU4 SUFFIX
CASE 517AZ
MSOP−8
Z SUFFIX
CASE 846AD
PIN CONFIGURATION
A0
1
A1
VCC
WP
A2
SCL
VSS
SDA
PDIP (L), SOIC (W, X), TSSOP (Y),
TDFN (ZD2)**, UDFN (HU4), MSOP (Z)
For the location of Pin 1, please consult the
corresponding package drawing.
** Not recommended for new designs
PIN FUNCTION
Pin Name†
Function
A0, A1, A2
SDA
Device Address
Serial Data
SCL
Serial Clock
WP
Write Protect
VCC
Power Supply
VSS
Ground
†The exposed pad for the TDFN/UDFN packages can
be left floating or connected to Ground.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 18 of this data sheet.
Publication Order Number:
CAT24C256/D
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