CAT24C21WI Datasheet, PDF (1/14 Pages) ON Semiconductor – 1 kb Dual Mode Serial EEPROM for VESA Plug-and-Play

CAT24C21
1 kb Dual Mode Serial
EEPROM for VESAt
“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
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,
while the bi−directional mode is a read and write mode following the
I²C 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.
Features
• DDC1t/DDC2t Interface Compliant for Monitor Identification
• 400 kHz I²C 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
V_CC
SCL
VCLK
CAT24C21
SDA
http://onsemi.com
SOIC−8
W SUFFIX
CASE 751BD
TDFN−8
ZD4 SUFFIX
CASE 511AL
MSOP−8
Z SUFFIX
CASE 846AD
PDIP−8
L SUFFIX
CASE 646AA
TSSOP−8
Y SUFFIX
CASE 948AL
PIN CONFIGURATION
NC
1
NC
V_CC
VCLK
NC
SCL
V_SS
SDA
PDIP (L), SOIC (W), TSSOP (Y),
TDFN (ZD4), MSOP (Z)
Pin Name
NC
SDA
SCL
VCLK
V_CC
V_SS
PIN FUNCTION
Function
No Connect
Serial Data / Address
Serial Clock (bi−directional mode)
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
1
September, 2009 − Rev. 16
Publication Order Number:
CAT24C21/D