-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 EXiSQo6DIu9fioqq4s212kUaapgltTD03OEi0VYX+G5FjE/Xc6aorRFnx89jb2Pi
 yW8REQMlhF+odxEhhygfHA==

<SEC-DOCUMENT>0001210985-05-000016.txt : 20050921
<SEC-HEADER>0001210985-05-000016.hdr.sgml : 20050921
<ACCEPTANCE-DATETIME>20050921211606
ACCESSION NUMBER:		0001210985-05-000016
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050916
FILED AS OF DATE:		20050921
DATE AS OF CHANGE:		20050921

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTEGRATED CIRCUIT SYSTEMS INC
		CENTRAL INDEX KEY:			0000874689
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				232000174
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			0630

	BUSINESS ADDRESS:	
		STREET 1:		2435 BLVD OF THE GENERALS
		CITY:			NORRISTOWN
		STATE:			PA
		ZIP:			19403
		BUSINESS PHONE:		6106305300

	MAIL ADDRESS:	
		STREET 1:		2435 BLVD OF THE GENERALS
		CITY:			NORRISTOWN
		STATE:			PA
		ZIP:			19403

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LIEN JUSTINE F
		CENTRAL INDEX KEY:			0001210985

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19299
		FILM NUMBER:		051096953

	BUSINESS ADDRESS:	
		STREET 1:		ICS INC
		STREET 2:		2435 BLVD OF THE GENERALS
		CITY:			NORRISTOWN
		STATE:			PA
		ZIP:			19403
		BUSINESS PHONE:		6106305300

	MAIL ADDRESS:	
		STREET 1:		2435 BLVD. OF THE GENERALS
		CITY:			NORRISTOWN
		STATE:			PA
		ZIP:			19403
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2005-09-16</periodOfReport>

    <dateOfOriginalSubmission>2005-09-21</dateOfOriginalSubmission>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000874689</issuerCik>
        <issuerName>INTEGRATED CIRCUIT SYSTEMS INC</issuerName>
        <issuerTradingSymbol>ICST</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001210985</rptOwnerCik>
            <rptOwnerName>LIEN JUSTINE F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2435 BLVD. OF THE GENERALS</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NORRISTOWN</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19403</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>former CFO &amp; VP Finance</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>This amendment is being filed to add that the Reporting Person is no longer subject to Section 16.</remarks>

    <ownerSignature>
        <signatureName>Leslie Fleischer</signatureName>
        <signatureDate>2005-09-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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