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CAT24C21
1 kb Dual Mode Serial
EEPROM for VESA t
“Plug-and-Play”
Description
The CAT24C21 is a 1 kb Serial CMOS EEPROM internally
organized as 128 words of 8 bits each. The device complies with the
http://onsemi.com
Video Electronics Standard Association’s (VESA ? ), Display Data
Channel (DDC ? ) standards for “Plug ? and ? Play” monitors. The
“transmit ? only” mode (DDC1 ? ) is controlled by the VCLK clock
input and the “bi ? directional” mode (DDC2 ? ) is controlled by the
SCL clock input, with both modes sharing a common SDA
input/output (I/O). The transmit ? only mode is a read ? only mode,
SOIC ? 8
W SUFFIX
CASE 751BD
TDFN ? 8
ZD4 SUFFIX
CASE 511AL
MSOP ? 8
Z SUFFIX
CASE 846AD
while the bi ? directional mode is a read and write mode following the
I 2 C protocol. In write mode the CAT24C21 features a 16 ? byte page
write buffer. The device is available in 8 ? lead DIP, SOIC, TSSOP,
MSOP and TDFN packages.
V CC
Features
? DDC1 t /DDC2 t Interface Compliant for Monitor Identification
? 400 kHz I 2 C Bus Compatible
? 2.5 to 5.5 Volt Operation
? 16 ? byte Page Write Buffer
? Hardware Write Protect
? Low Power CMOS Technology
? 1,000,000 Program/Erase Cycles
? 100 Year Data Retention
? Industrial Temperature Range
? 8 ? lead DIP, SOIC, TSSOP, MSOP or TDFN Packages
? This Device is Pb ? Free, Halogen Free/BFR Free, and RoHS
Compliant
PDIP ? 8 TSSOP ? 8
L SUFFIX Y SUFFIX
CASE 646AA CASE 948AL
PIN CONFIGURATION
NC 1
NC VCLK
NC SCL
V SS SDA
PDIP (L), SOIC (W), TSSOP (Y),
TDFN (ZD4), MSOP (Z)
PIN FUNCTION
SCL
V CC
Pin Name
NC
SDA
SCL
Function
No Connect
Serial Data / Address
Serial Clock (bi ? directional mode)
VCLK
CAT24C21
SDA
VCLK
V CC
V SS
Serial Clock (transmit ? only mode)
Power Supply
Ground
V SS
Figure 1. Functional Symbol
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 14 of this data sheet.
? Semiconductor Components Industries, LLC, 2009
September, 2009 ? Rev. 16
1
Publication Order Number:
CAT24C21/D
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