参数资料
型号: MSC8144ADS
厂商: Freescale Semiconductor
文件页数: 30/80页
文件大小: 0K
描述: ADS FOR MSC8144 DEVICE
标准包装: 1
类型: DSP
适用于相关产品: MSC8144
所含物品: AMC 卡、电源、缆线、USB TAP、硬件和说明文档
Electrical Characteristics
2.5.1.2
DDR (2.5V) SDRAM DC Electrical Characteristics
Table 7 provides the recommended operating conditions for the DDR SDRAM component(s) of the MSC8144 when
V DDDDR (typ) = 2.5 V.
Table 7. DDR SDRAM DC Electrical Characteristics for V DDDDR (typ) = 2.5 V
Parameter/Condition
I/O supply voltage 1
Symbol
V DDDDR
Min
2.3
Max
2.7
Unit
V
I/O reference
voltage 2
MV REF
0.49 × V DDDDR
0.51 × V DDDDR
V
I/O termination voltage
Output leakage current
3
Input high voltage
Input low voltage
4
Output high current (V OUT = 1.95 V)
Output low current (V OUT = 0.35 V)
V TT
V IH
V IL
I OZ
I OH
I OL
MV REF – 0.04
MV REF + 0.15
–0.3
–50
–16.2
16.2
MV REF + 0.04
V DDDDR + 0.3
MV REF – 0.15
50
V
V
V
μ A
mA
mA
Notes:
1.
2.
3.
4.
V DDDDR is expected to be within 50 mV of the DRAM V DD at all times.
MV REF is expected to be equal to 0.5 × V DDDDR , and to track V DDDDR DC variations as measured at the receiver.
Peak-to-peak noise on MV REF may not exceed ± 2% of the DC value.
V TT 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 MV REF . This rail should track variations in the DC level of V DDDDR .
Output leakage is measured with all outputs are disabled, 0 V ≤ V OUT ≤ V DDDDR .
Table 8 lists the current draw characteristics for MV REF .
Table 8. Current Draw Characteristics for MV REF
Current draw for MV REF
Parameter / Condition
Symbol
I MVREF
Min
Max
500
Unit
μ A
Note:
30
The voltage regulator for MV REF must be able to supply up to 500 μ A current.
MSC8144 Quad Core Digital Signal Processor Data Sheet, Rev. 16
Freescale Semiconductor
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