-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 AAb9X5WdrB6il/ae3Eaa/Qer9+3pDLmdssjQOvGTFVebnb8RkGqPdtGbbVh1Uhmf
 Jl5H5Anx6D46KhA28aPCBg==

<SEC-DOCUMENT>0000929638-09-001427.txt : 20090921
<SEC-HEADER>0000929638-09-001427.hdr.sgml : 20090921
<ACCEPTANCE-DATETIME>20090918201856
ACCESSION NUMBER:		0000929638-09-001427
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090921
DATE AS OF CHANGE:		20090918
EFFECTIVENESS DATE:		20090921

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CHELSIO COMMUNICATIONS INC
		CENTRAL INDEX KEY:			0001142038
		IRS NUMBER:				943274896
		STATE OF INCORPORATION:			CA

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-48160
		FILM NUMBER:		091077784

	BUSINESS ADDRESS:	
		STREET 1:		370 SAN ALESO AVENUE
		STREET 2:		SUITE 100
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94085
		BUSINESS PHONE:		408-962-3600

	MAIL ADDRESS:	
		STREET 1:		370 SAN ALESO AVENUE
		STREET 2:		SUITE 100
		CITY:			SUNNYVALE
		STATE:			CA
		ZIP:			94085

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ASIC DESIGNERS INC
		DATE OF NAME CHANGE:	20010605
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0502</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001142038</cik>
        <entityName>CHELSIO COMMUNICATIONS INC</entityName>
        <issuerAddress>
            <street1>370 San Aleso Avenue, Suite 100</street1>
            <city>Sunnyvale</city>
            <stateOrCountry>CA</stateOrCountry>
            <zipCode>94085</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>408-962-3600</issuerPhoneNumber>
        <issuerPreviousNameList>
            <previousName>ASIC Designers, Inc.</previousName>
        </issuerPreviousNameList>
        <jurisdictionOfInc>CALIFORNIA</jurisdictionOfInc>
        <entityType>Corporation</entityType>
        <yearOfInc>
            <overFiveYears>true</overFiveYears>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Kianoosh</firstName>
                <middleName></middleName>
                <lastName>Naghshineh</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>370 San Aleso Avenue, Suite 100</street1>
                <city>Sunnyvale</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94085</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
                <relationship>Executive Officer</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Forest</firstName>
                <middleName></middleName>
                <lastName>Baskett</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>2490 Sand Hill Road</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Esfandiar</firstName>
                <middleName></middleName>
                <lastName>Lohrasbpour</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>101 California Street, Suite 1900</street1>
                <city>San Francisco</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94111</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Jose</firstName>
                <middleName></middleName>
                <lastName>Suarez</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>333 Middlefield Road, Suite 110</street1>
                <city>Menlo Park</city>
                <stateOrCountry>CA</stateOrCountry>
                <zipCode>94025</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Director</relationship>
            </relatedPersonRelationshipList>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other Technology</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>Decline to Disclose</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2009-05-14</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>false</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isEquityType>true</isEquityType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>0</minimumInvestmentAccepted>
        <salesCompensationList></salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>16000000</totalOfferingAmount>
            <totalAmountSold>9301658</totalAmountSold>
            <totalRemaining>6698342</totalRemaining>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>14</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>0</dollarAmount>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>660000</dollarAmount>
                <isEstimate>true</isEstimate>
            </grossProceedsUsed>
            <clarificationOfResponse>Proceeds of offering and operating revenues will be used to fund operations, including the payment of salaries of executive officers, which total approximately $660,000 per calendar year.</clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Chelsio Communications, Inc.</issuerName>
                <signatureName>/s/ Kianoosh Naghshineh</signatureName>
                <nameOfSigner>Kianoosh Naghshineh</nameOfSigner>
                <signatureTitle>President and CEO</signatureTitle>
                <signatureDate>2009-09-18</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----