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(jī)械和熱規(guī)格
文件頁數(shù): 61/126頁
文件大?。?/td> 1563K
代理商: PXA270
Electrical, Mechanical, and Thermal Specification
5-11
Intel PXA270 Processor
Electrical Specifications
5.5.2
13.000-MHz Oscillator Specifications
The 13.000-MHz oscillator is connected between the PXTAL_IN (amplifier input) and
PXTAL_OUT (amplified output).
Table 5-11
and
Table 5-12
list the 13.000-MHz specifications.
To drive the 13.000-MHz crystal pins from an external source:
1. Drive the PXTAL_IN pin with a digital signal with low and high levels as listed in
Table 5-12
.
Do not exceed VCC_PLL or go below VSS_PLL by more than 100 mV. The minimum slew
rate is 1 volt / 100 ns. The maximum current drawn from the external clock source when the
clock is at its maximum positive voltage typically is 1 mA.
2. Float the PXTAL_OUT pin or drive it in complement to the PXTAL_IN pin, with the same
voltage level, slew rate, and input current restrictions.
Caution:
The PXTAL_IN and PXTAL_OUT pins must not be driven from an external source if the PXA270
processor sleep / deep sleep DC-DC converter is enabled.
Table 5-10. Typical External 32.768-kHz Oscillator Requirements
Symbol
Description
Min
Typical
Max
Units
Amplifier Specifications
VIH_X
Input high voltage, TXTAL_IN
0.99
1.10
1.21
V
VIL_X
Input low voltage, TXTAL_IN
–0.10
0.00
0.10
V
IIN_XT
Input leakage, TXTAL_IN
1
μ
A
CIN_XT
Input capacitance, TXTAL_IN/
TXTAL_OUT
18
25
pf
tS_XT
Stabilization time
10
s
Board Specifications
RP_XT
Parasitic resistance, TXTAL_IN/
TXTAL_OUT to any node
20
M
CP_XT
Parasitic capacitance, TXTAL_IN/
TXTAL_OUT, total
5
pf
COP_XT
Parasitic shunt capacitance,
TXTAL_IN to TXTAL_OUT
0.4
pf
Table 5-11. Typical 13.000-MHz Crystal Requirements
Parameter
Minimum
Typical
Maximum
Units
Frequency range
12.997
13.000
13.002
MHz
Frequency tolerance at 25
°
C
–50
+50
ppm
Oscillation mode
Fnd
Maximum change over temperature range
–50
+50
ppm
Drive level
10
100
uW
Load capacitance (C
L
)
10
pf
Maximum series resistance (R
S
)
50
Aging per year, at operating temperature
±5.0
ppm
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