参数资料
型号: MPC8544VTALJB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783
封装: 29 X 29 MM, 1 MM PITCH, LEAD FREE, PLASTIC, BGA-783
文件页数: 31/120页
文件大小: 1321K
代理商: MPC8544VTALJB
MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 2
18
Freescale Semiconductor
DDR and DDR2 SDRAM
Table 12 provides the recommended operating conditions for the DDR SDRAM component(s) when
GVDD(typ) = 2.5 V.
Table 13 provides the DDR I/O capacitance when GVDD(typ) = 2.5 V.
Table 14 provides the current draw characteristics for MVREF.
Table 12. DDR SDRAM DC Electrical Characteristics for GVDD(typ) = 2.5 V
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 + 0.31
GVDD + 0.3
V
Input low voltage
VIL
–0.3
MVREF – 0.3
V
Output leakage current
IOZ
–50
50
μA4
Output high current (VOUT = 1.8 V)
IOH
–16.2
mA
Output low current (VOUT = 0.42 V)
IOL
16.2
mA
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
VOUT GVDD.
Table 13. DDR SDRAM Capacitance for GVDD(typ) = 2.5 V
Parameter/Condition
Symbol
Min
Max
Unit
Notes
Input/output capacitance: DQ, DQS
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.
Table 14. Current Draw Characteristics for MVREF
Parameter/Condition
Symbol
Min
Max
Unit
Notes
Current draw for MVREF
IMVREF
500
μA1
Note:
1. The voltage regulator for MVREF must be able to supply up to 500 μA current.
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