參數(shù)資料
        型號(hào): AD401M326VQB-5
        廠商: Electronic Theatre Controls, Inc.
        英文描述: Low voltage operation is more suitable to be used on battery backup, portable electronic
        中文描述: 低電壓操作更適合于備用電池,使用便攜式電子
        文件頁(yè)數(shù): 14/28頁(yè)
        文件大小: 211K
        代理商: AD401M326VQB-5
        Rev.1
        Page 14
        Notes :
        1. AC measurements assume t
        T
        = 2ns.
        2. An initial pause of 100
        is required after power up, and it followed by a minimum of eight
        initialization cycles (RAS - only refresh cycle or CAS - before - RAS refresh cycle). If the internal
        refresh counter is used, a minimun of eight CAS - before - RAS refresh cycles are required.
        3. In delayed write or read-modify-write cycles, OE must disable output buffer prior to applying data to
        the device.
        4. All the V
        CC
        and V
        SS
        pins shall be supplied with the same voltages.
        5. t
        RAS
        (min) = t
        RWD
        (min)+t
        RWL
        (min)+t
        T
        in read-modify-write cycle.
        6. t
        CAS
        (min) = t
        CWD
        (min)+t
        CWL
        (min)+t
        T
        in read-modify-write cycle.
        7. t
        ASC
        (min), t
        RCS
        (min), t
        WCS
        (min), and t
        RPC
        are determined by the falling edge of CAS .
        8. t
        RCD
        (max) is specified as a reference point only, and t
        RAC
        (max) can be met with the t
        RCD
        (max) limit.
        Otherwise, t
        RAC
        is controlled exclusively by t
        CAC
        if t
        RCD
        is greater than the specified t
        RCD
        (max) limit.
        9. t
        RAD
        (max) is specified as a reference point only, and t
        RAC
        (max) can be met with the t
        RAD
        (max) limit.
        Otherwise, t
        RAC
        is controlled exclusively by t
        AA
        if t
        RAD
        is greater than the specified t
        RAD
        (max) limit.
        10. t
        CRP
        , t
        CHR
        , t
        RCH
        , t
        CPA
        and t
        CPW
        are determined by the rising edge of CAS .
        11. V
        IH
        (min) and V
        IL
        (max) are reference levels for measuring timing or input signals. Therefore, transition
        time is measured between V
        IH
        and V
        IL
        .
        12. Assumes that t
        RCD
        t
        RCD
        (max) and t
        RAD
        t
        RAD
        (max). If t
        RCD
        or t
        RAD
        is greater than the maximum
        recommended value shown in this table, t
        RAC
        exceeds the value shown.
        13. Assumes that
        (max) and
        (max).
        14. Access time is determined by the maximum of t
        AA
        , t
        CAC
        , t
        CPA
        .
        15. Assumes that
        (max) and
        (max).
        16. Either t
        RCH
        or t
        RRH
        must be satisfied for a read cycle.
        17. t
        OFF
        (max) and t
        OEZ
        (max) define the time at which the output achieves the open circuit condition (high
        impedance). t
        OFF
        is determined by the later rising edge of RAS or CAS.
        18. t
        WCS
        , t
        RWD
        , t
        CWD
        , and t
        AWD
        are not restrictive operating parameters. They are included in the data
        sheet as electrical characteristics only. If
        (min), the cycle is an early write cycle and the
        data out will remain open circuit (high impedance) throughout the entire cycle. If
        (min),
        (min),
        (min) and
        (min), the cycle is a read-modify-write and
        the data output will contain data read from the selected cell. If neither of the above sets of conditions
        is satisfied, the condition of the data output (at access time) is indeterminate.
        19. These parameters are referenced to CAS separately in an early write cycle and to WE edge in a
        delayed write or a read-modify-write cycle.
        20. t
        RASP
        defines RAS pulse width in EDO page mode cycles.
        μ
        s
        t
        RCD
        t
        RCD
        t
        RAD
        t
        RAD
        t
        RCD
        t
        RCD
        t
        RAD
        t
        RAD
        t
        WCS
        t
        WCS
        t
        RWD
        t
        RWD
        t
        CWD
        t
        CWD
        t
        AWD
        t
        AWD
        t
        CPW
        t
        CPW
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