參數(shù)資料
型號: PXA270
廠商: Intel Corp.
英文描述: Electrical, Mechanical, and Thermal Specification
中文描述: 電氣,機械和熱規(guī)格
文件頁數(shù): 62/126頁
文件大小: 1563K
代理商: PXA270
5-12
Electrical, Mechanical, and Thermal Specification
Intel PXA270 Processor
Electrical Specifications
5.6
CLK_PIO and CLK_TOUT Specifications
CLK_PIO can be used to drive a buffered version of the PXTAL_IN oscillator input or can be used
as a clock input alternative to PXTAL_IN. Refer to
Table 5-13
for CLK_PIO specifications.
A buffered and inverted version of the TXTAL_IN oscillator output is driven out on CLK_TOUT.
Refer to
Table 5-14
for CLK_TOUT specifications.
Note:
CLK_TOUT and CLK_PIO are only available when software sets the OSCC[PIO_EN] and
OSCC[TOUT_EN] bits.
Table 5-12. Typical External 13.000-MHz Oscillator Requirements
Symbol
Description
Min
Typical
Max
Units
Amplifier Specifications
VIH_X
Input high voltage, PXTAL_IN
0.99
1.10
1.21
V
VIL_X
Input low voltage, PXTAL_IN
–0.10
0.00
0.10
V
IIN_XP
Input leakage, PXTAL_IN
10
μ
A
CIN_XP
Input capacitance, PXTAL_IN/PXTAL_OUT
40
50
pf
tS_XP
Stabilization time
67.8
ms
Board Specifications
RP_XP
Parasitic resistance, PXTAL_IN/PXTAL_OUT to
any node
20
M
CP_XP
Parasitic capacitance, PXTAL_IN/PXTAL_OUT,
total
5
pf
COP_XP
Parasitic shunt capacitance, PXTAL_IN to
PXTAL_OUT
0.4
pf
Table 5-13. CLK_PIO Specifications
Parameter
Specifications
Frequency
13 MHz
Frequency Accuracy (derived from 13 MHz crystal)
+/-200ppm
Symmetry/Duty Cycle variation
30/70 to 70/30% at VCC
Jitter
+/-20pS max
Load capacitance (C
L
)
50pf max
Rise and Fall time (Tr & Tf)
15nS max with 50pF load
Table 5-14. CLK_TOUT Specifications
Parameter
Specifications
Frequency
32KHz
Frequency Accuracy (derived from 32 kHz crystal)
+/-200ppm
Symmetry/Duty Cycle variation
30/70 to 70/30% at VCC
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