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CAT24C21YETE13 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT24C21YETE13
Beschreibung 1-kb Dual Mode Serial EEPROM for VESA Plug-and-Play
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 12 Seiten
CAT24C21YETE13 Datasheet, Funktion
CAT24C21
1-kb Dual Mode Serial EEPROM for VESA"Plug-and-Play"
FEATURES
ALOGEN FR
LEA D F REETM
s DDC1TM/DDC2TM interface compliant for
monitor identification
s 400 kHz I2C bus compatible*
s 2.5 to 5.5 volt operation
s 16-byte page write buffer
s Hardware write protect
s Low power CMOS technology
s 1,000,000 program/erase cycles
s 100 year data retention
s 8-pin DIP, SOIC, TSSOP, MSOP or TDFN
packages
s Industrial temperature range
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-in DIP, SOIC, TSSOP,
MSOP and TDFN packages.
PIN CONFIGURATION
DIP Package (P, L)
SOIC Package (J, W)
NC
NC
NC
VSS
1
2
3
4
8 VCC
7 VCLK
6 SCL
5 SDA
NC
NC
NC
VSS
1
2
3
4
8 VCC
7 VCLK
6 SCL
5 SDA
MSOP Package (R, Z)
TDFN Package (RD4, ZD4)
NC
NC
NC
VSS
1
2
3
4
8 VCC
7 VCLK
6 SCL
5 SDA
TSSOP Package (U, Y)
NC 1
NC 2
NC 3
VSS 4
8 VCC
7 VCLK
6 SCL
5 SDA
3 mm x 3 mm
Top View
NC
NC
NC
VSS
1
2
3
4
8 VCC
7 VCLK
6 SCL
5 SDA
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus
Protocol.
FUNCTIONAL SYMBOL
VCC
SCL
VCLK
CAT24C21
SDA
VSS
PIN FUNCTIONS
Pin Name
Function
NC No Connect
SDA
Serial Data/Address
SCL Serial Clock (bi-directional mode)
VCLK
Serial Clock (transmit-only mode)
VCC Power Supply
VSS Ground
© 2004 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1032, Rev. O






CAT24C21YETE13 Datasheet, Funktion
CAT24C21
Acknowledge
After a successful data transfer, each receiving device is
required to generate an acknowledge (ACK). The
acknowledging device pulls down the SDA line during the
ninth clock cycle, signaling that it has received the 8 bits of
data (Figure 7).
The CAT24C21 responds with an ACK after receiving a
START condition and its slave address. If the device has
been selected along with a write operation, it responds
with an ACK after receiving each 8-bit byte.
When the CAT24C21 is in a READ mode it transmits 8
bits of data, releases the SDA line, and monitors the line
for an ACK. Once it receives this ACK, the CAT24C21
will continue to transmit data. If no ACK is sent by the
Master, the device terminates data transmission and
waits for a STOP condition.
Write Operations
VCLK must be held high in order to program the device.
This applies to byte write and page write operation.
Once the device is in its self-timed program cycle,
VCLK can go low and not affect programming.
Byte Write
In the Byte Write mode (Figure 9), the Master device
sends the START condition and the slave address
information (with the R/W bit set to zero) to the Slave
device. After the Slave generates an ACK, the Master
sends the byte address that is to be written into the
address pointer of the CAT24C21. After receiving another
ACK from the Slave, the Master device transmits the
data byte to be written into the addressed memory
location. The CAT24C21 acknowledges once more and
the Master generates the STOP condition, at which time
the device begins its internal programming cycle to
nonvolatile memory (Figure 5). While this internal cycle
is in progress, the device will not respond to any request
from the Master device.
Figure 4. Bus Timing
tF tHIGH tR
tLOW
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
SDA IN
SDA OUT
tAA tDH
tSU:STO
tBUF
Figure 5. Write Cycle Timing
SCL
SDA
8th Bit
Byte n
ACK
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
Doc. No. 1032, Rev. O
6

6 Page









CAT24C21YETE13 pdf, datenblatt
CAT24C21
Copyrights, Trademarks and Patents
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP ™ AE2
I2C is a trademark of Philips.
DDC, DDC1, DDC2 and VESA are trademarks of the Video Electronics Standards Association.
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents
issued to Catalyst Semiconductor contact the Company’s corporate office at 408.542.1000.
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or
other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a
situation where personal injury or death may occur.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets
labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate
typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
Corporate Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Fax: 408.542.1200
www.catalyst-semiconductor.com
Doc. No. 1032, Rev. O
12
Publication #: 1032
Revison:
O
Issue date: 7/27/04

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