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參數(shù)資料
| 型號： | PXA255 |
| 廠商： | Intel Corp. |
| 英文描述： | PXA255 Processor |
| 中文描述： | PXA255處理器 |
| 文件頁數(shù)： | 27/40頁 |
| 文件大小： | 1191K |
| 代理商： | PXA255 |
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Electrical Specifications
Intel PXA255 Processor
Electrical, Mechanical, and Thermal Specification
27
4.5
Targeted AC Specifications
All the non-analog input, output, and I/O pins on the processor can be divided into one of two
categories:
1. High Strength Input, Output, and I/O pins:
nCS[5:1] (GP 33, 80, 79, 78, 15 respectively), nCS[0]
MD[31:0], MA[25:0]
DQM[3:0]
nOE, nWE, nSDRAS, nSDCAS, nSDCS[3:0]
SDCLK[2:0], SDCKE[1:0]
RDnWR, RDY (GP[18])
nPWE, nPOE pins (GP[49:48])
MMCLK (GP[53]), MMCMD, MMDAT
TDO
nACRESET
2. Low Strength Input, Output, and I/O pins - all remaining non-supply pins
A pin’s AC characteristics include input and output capacitance, which determine loading for
external drivers or other load analysis. The AC characteristics also include a de-rating factor, which
indicates how much faster or slower the AC timings get with different loads.
Table 12, “Standard
Input, Output, and I/O Pin AC Operating Conditions”
shows the AC operating conditions for the
high- and low-strength input, output, and I/O pins. All AC specification values are valid for the
entire temperature range of the device.
Table 11. Standard Input, Output, I/O Pin DC Operating Conditions for 2.5-V Memory
Symbol
Description
Min
Typ
Max
Units
Input DC Operating Conditions
Vih
Input High Voltage, all standard input and
I/O pins
0.9*VCCN
VCCN
V
Vil
Input Low Voltage, all standard input and
I/O pins
VSS
0.1*VCCN
V
Iin
Input Leakage, all standard input and I/O
pins
-
10
uA
Output DC Operating Conditions
Voh
Output High Voltage, all standard output
and I/O pins
VCCN-0.3
VCCN
V
Vol
Output Low Voltage, all standard output
and I/O pins
VSS
VSS+0.3
V
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