PROGRAMMABLE LOGIC DEVICE WITH VERIFY CIRCUITRY FOR CLASSIFYING FUSE LINK STATES AS VALIDLY CLOSED, VALIDLY OPEN OR INVALID

摘要

(51) International Patent Classification 6: (11) International Publication Number: WO 95/32507G11C 29/00, 17/14 A1(43) International Publication Date: 30 November 1995 (30.11.95)(21) International Application Number: PCF/IB95/00339 (81) Designated States: JP, KR, SG,European patent (AT, BE, CH,DE, DK, ES, FR, GB, GR,IE, IT, LU, MC, NL, PT, SE).(22) International Filing Date: 9 May 1995 (09.05.95)Published(30) Priority Data: With international search report.08/247,934 24 May 1994(24.05.94) US Before the expiration of the time limit for amending theclaims and to be republished in the event of the receipt ofamendments.(71) Applicant/PHILIPS ELECTRONICS N.V. [NL/NL]; Groe-newoudseweg 1, NL-5621 BA Eindhoven (NL).(71) Applicant (for SE only): PHILIPS NORDEN AB [SE/SE];Kottbygatan 5, Kista, S-164 85 Stockholm (SE).(72) Inventors:SHIMANEK, Schuyler, 9221 Holm Bursen Drive,N.W., Albuquerque, MN 87113 (US). ANDERSON, Alma;2042 Rivers Edge Drive, N.E., Rio Rancho, NM 87124(US).(74) Agent: VERDONK, Peter, Lambert, Frans, Maria; Internation-aal Octrooibureau B.V., P.O. Box 220, NL-5600 AE Eind-hoven (NL).(54) Title: PROGRAMMABLE LOGIC DEVICE WITH VERIFY CIRCUITRY FOR CLASSIFYING FUSE LINK STATES ASVALIDLY CLOSED, VALIDLY OPEN OR INVALID[err]A PLD with an array of fuse or anti-fuse links includes verification circuitry configured to classify the links into three zones,corresponding to a "closed" state zone of low resistance values, an "open" state zone of high resistance values and a "forbidden" state zoneintermediate the "closed" and "open" state zones. Because the ratio between the higher and lower resistance value is typically 200, theverification circuitry includes a switchable two level current source that produces a voltage across the link of correct dynamic range. FOR THE PURPOSES OF INFORMATION ONLYCodes used to identify States party to the PCT on the front pages of pamphlets publishing internationalapplications under the PCT.AT Austria GB United Kingdom MR MauritaniaAU Australia GE Georgia MW MalawiBB Babados GN Guinea NE NigerBE Belgium GR Greece NL NetherlandsBF Burkina Faso HU Hungary NO NorwayBG Bulgaria IE Ireland NZ New ZealandBJ Benin IT Italy PL PolandBR Brazil JP Japan PT PortugalBY Belarus KE Kenya RO RomaniaCA Canada KG Kyrgstan RU Russian FederationCF Central African Republic KP Democratic People's Republic SD SudanCG Congo Of Korea SE SwedenCH Switzerland KR Republic of Korea SI SloveniaCI Cote d'Ivoire KZ Kazakhatan SK SlovakiaCM Cameroon LI Liechtenstein SN SenegalCN China LK Sri Lanka TD ChadCS Czechoslovakia LU Luxembourg TG TogoCZ Czech Republic LV Larvia TJ TajikistanDE Germany MC Monaco IT Trinidad and TobagoDK Denmark MD Republic of Moldova UA UkraineES Spain MG Madagascar US United States of AmericaFI Finlandq ML Mali UZ UzbekistanFR France MN Mongolia VN Viet NamGA Gabon