Phase change RAM operated with 1.5-V CMOS as low cost embedded memory

K. Osada, T. Kawahara, R. Takemura, N. Kitai, N. Takaura, N. Matsuzaki, K. Kurotsuchi, H. Moriya, M. Moniwa

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    15 Citations (Scopus)

    Abstract

    This paper describes a phase change (PC) RAM operated at the lowest possible voltage, 1.5 V, with a CMOS memory array, using PC material with the lowest RESET current. We discuss the margins for RESET/SET/READ operations based on measurement results and identified that it is impossible to distinguish between RESET/SET operations by controlling the bitline voltage. We propose a new tri-level voltage word-line control (3LV-WL) scheme to clearly operate SET operations. Moreover, we investigated the READ disturb operation and developed a new reduced-actual-READ-access (RA2) scheme to attain 500 times the READ retention time. We also developed a source line control (SLC) scheme to attain an 18% smaller cell size and a 19-F2 memory cell with enough RESET current to clearly reset the PC material. With the application of these approaches, we established RESET/SET/READ operations with the lowest possible voltage, 1.5 V with logic CMOS, for a low-cost embedded memory with a few additional masks.

    Original languageEnglish
    Title of host publicationProceedings of the IEEE 2005 Custom Integrated Circuits Conference
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages431-434
    Number of pages4
    ISBN (Print)0780390237, 9780780390232
    DOIs
    Publication statusPublished - 2005
    EventIEEE 2005 Custom Integrated Circuits Conference - San Jose, CA, United States
    Duration: 2005 Sep 182005 Sep 21

    Publication series

    NameProceedings of the Custom Integrated Circuits Conference
    Volume2005
    ISSN (Print)0886-5930

    Other

    OtherIEEE 2005 Custom Integrated Circuits Conference
    CountryUnited States
    CitySan Jose, CA
    Period05/9/1805/9/21

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Fingerprint Dive into the research topics of 'Phase change RAM operated with 1.5-V CMOS as low cost embedded memory'. Together they form a unique fingerprint.

    Cite this