參數(shù)資料
      型號: MPC8555VTALD
      廠商: FREESCALE SEMICONDUCTOR INC
      元件分類: 微控制器/微處理器
      英文描述: 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783
      封裝: 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, FLIP CHIP, PLASTIC, BGA-783
      文件頁數(shù): 8/88頁
      文件大?。?/td> 772K
      代理商: MPC8555VTALD
      MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specification, Rev. 3.1
      16
      Freescale Semiconductor
      DDR SDRAM
      6
      DDR SDRAM
      This section describes the DC and AC electrical specifications for the DDR SDRAM interface of the
      MPC8555E.
      6.1
      DDR SDRAM DC Electrical Characteristics
      Table 11 provides the recommended operating conditions for the DDR SDRAM component(s) of the
      MPC8555E.
      Table 12 provides the DDR capacitance.
      Table 11. DDR SDRAM DC Electrical Characteristics
      Parameter/Condition
      Symbol
      Min
      Max
      Unit
      Notes
      I/O supply voltage
      GVDD
      2.375
      2.625
      V
      1
      I/O reference voltage
      MVREF
      0.49
      × GVDD
      0.51
      × GVDD
      V2
      I/O termination voltage
      VTT
      MVREF – 0.04
      MVREF + 0.04
      V
      3
      Input high voltage
      VIH
      MVREF + 0.18
      GVDD + 0.3
      V
      Input low voltage
      VIL
      –0.3
      MVREF – 0.18
      V
      Output leakage current
      IOZ
      –10
      10
      A4
      Output high current (VOUT = 1.95 V)
      IOH
      –15.2
      mA
      Output low current (VOUT = 0.35 V)
      IOL
      15.2
      mA
      MVREF input leakage current
      IVREF
      —5
      A
      Notes:
      1. GVDD is expected to be within 50 mV of the DRAM GVDD at all times.
      2. MVREF is expected to be equal to 0.5 × GVDD, and to track GVDD DC variations as measured at the receiver. Peak-to-peak
      noise on MVREF may not exceed ±2% of the DC value.
      3. VTT is not applied directly to the device. It is the supply to which far end signal termination is made and is expected to be
      equal to MVREF. This rail should track variations in the DC level of MVREF.
      4. Output leakage is measured with all outputs disabled, 0 V
      V
      OUT GVDD.
      Table 12. DDR SDRAM Capacitance
      Parameter/Condition
      Symbol
      Min
      Max
      Unit
      Notes
      Input/output capacitance: DQ, DQS, MSYNC_IN
      CIO
      68
      pF
      1
      Delta input/output capacitance: DQ, DQS
      CDIO
      —0.5
      pF
      1
      Note:
      1. This parameter is sampled. GVDD = 2.5 V ± 0.125 V, f = 1 MHz, TA = 25°C, VOUT = GVDD/2, VOUT (peak to peak) = 0.2 V.
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