参数资料
型号: MPC8548ECVTAUJB
厂商: Freescale Semiconductor
文件页数: 65/151页
文件大小: 0K
描述: MPU POWERQUICC III 783-PBGA
产品培训模块: MPC8548 PowerQUICC III Processors
标准包装: 1
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 1.333GHz
电压: 1.1V
安装类型: 表面贴装
封装/外壳: 783-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9
20
Freescale Semiconductor
DDR and DDR2 SDRAM
6
DDR and DDR2 SDRAM
This section describes the DC and AC electrical specifications for the DDR SDRAM interface of the
device. Note that GVDD(typ) = 2.5 V for DDR SDRAM, and GVDD(typ) = 1.8 V for DDR2 SDRAM.
6.1
DDR SDRAM DC Electrical Characteristics
The following table provides the recommended operating conditions for the DDR2 SDRAM controller of
the device when GVDD(typ) = 1.8 V.
This table provides the DDR2 I/O capacitance when GVDD(typ) = 1.8 V.
Table 11. DDR2 SDRAM DC Electrical Characteristics for GVDD(typ) = 1.8 V
Parameter/Condition
Symbol
Min
Max
Unit
Notes
I/O supply voltage
GVDD
1.71
1.89
V
1
I/O reference voltage
MVREF
0.49
GV
DD
0.51
GV
DD
V2
I/O termination voltage
VTT
MVREF –0.04
MVREF + 0.04
V
3
Input high voltage
VIH
MVREF +0.125
GVDD +0.3
V
Input low voltage
VIL
–0.3
MVREF –0.125
V
Output leakage current
IOZ
–50
50
A4
Output high current (VOUT = 1.420 V)
IOH
–13.4
mA
Output low current (VOUT = 0.280 V)
IOL
13.4
mA
Notes:
1. GVDD is expected to be within 50 mV of the DRAM VDD 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 must track variations in the DC level of MVREF.
4. Output leakage is measured with all outputs disabled, 0 V
V
OUT GVDD.
Table 12. DDR2 SDRAM Capacitance for GVDD(typ)=1.8 V
Parameter/Condition
Symbol
Min
Max
Unit
Notes
Input/output capacitance: DQ, DQS, DQS
CIO
68
pF
1
Delta input/output capacitance: DQ, DQS, DQS
CDIO
—0.5
pF
1
Note:
1. This parameter is sampled. GVDD = 1.8 V ± 0.090 V, f = 1 MHz, TA = 25°C, VOUT = GVDD/2, VOUT (peak-to-peak) = 0.2 V.
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