參數(shù)資料
型號(hào)： PXA250
廠商： Intel Corp.
英文描述： Intel-R PXA250 and PXA210 Applications Processors
中文描述： 英特爾- R的PXA250和PXA210應(yīng)用處理器
文件頁(yè)數(shù)： 34/46頁(yè)
文件大小： 431K
代理商： PXA250
PXA250 and PXA210
—
Electrical, Mechanical, and Thermal Specification
34
Datasheet
4.5.2
3.6864 MHz Oscillator Specifications
The 3.6864 MHz Oscillator is connected between the PXTAL (amplifier input) and PEXTAL
(amplified output). The 3.6864 MHz specifications are shown in Table 12,
“
3.6864 MHz Oscillator
Specifications
”
.
To drive the 3.6864 MHz crystal pins from an external source:
Drive the PEXTAL pin with a digital signal with a low level near 0 volts and a high level near
VCC. Do not exceed VCC or go below VSS by more than 100 mV. The minimum slew rate is
1 volt / 100 ns. The maximum current sourced by the external clock source when the clock is
at its maximum positive voltage should be approximately 1 mA.
Float the PXTAL pin or drive it complementary to the PXTAL pin, with the same voltage
level, slew rate, and input current restrictions. If floated, some degree of noise susceptibility
will be introduced in the system, and it is therefore not recommended.
Table 12. 3.6864 MHz Oscillator Specifications
Symbol
Description
Min
Typical
Max
Units
Crystal Specifications - Typical is FOX HC49S
FXP
Crystal Frequency, PXTAL/PEXTAL
3.6864
MHz
LMP
Motional Inductance, PXTAL/PEXTAL
0.50593
H
CMP
Motional Capacitance, PXTAL/PEXTAL
3.68488
fF
RMP
Motional Resistance, PXTAL/PEXTAL
50
99.3
200
W
COP
Shunt Capacitance PXTAL to PEXTAL
1.7
pF
CLP
Load Capacitance PXTAL/PEXTAL
20
pF
Amplifier Specifications
VIH_X
Input High Voltage, PXTAL
0.8*VCC
VCC
V
VIL_X
Input Low Voltage, PXTAL
VSS
0.2*VCC
V
IIN_XP
Input Leakage, PXTAL
10
A
CIN_XP
Input Capacitance, PXTAL/PEXTAL
40
50
pF
tS_XP
Stabilization Time
17.8
67.8
ms
Board Specifications
RP_XP
Parasitic Resistance, PXTAL/PEXTAL to
any node
20
M
CP_XP
Parasitic Capacitance, PXTAL/PEXTAL,
total
5
pF
COP_XP
Parasitic Shunt Capacitance, PXTAL to
PEXTAL
0.4
pF
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