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| 型號： | 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 |
| 文件頁數(shù)： | 33/46頁 |
| 文件大?。?/td> | 431K |
| 代理商： | PXA250 |
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Electrical, Mechanical, and Thermal Specification
—
PXA250 and PXA210
Datasheet
33
4.5
Oscillator Electrical Specifications
The applications processor contains two oscillators: a 32.768 kHz oscillator and a 3.6864 MHz
oscillator. Each is for a specific crystal. When choosing a crystal, match the crystal parameters as
closely as possible.
4.5.1
32.768 kHz Oscillator Specifications
The 32.768 kHz Oscillator is connected between the TXTAL (amplifier input) and TEXTAL
(amplified output). The 32.768 kHz specifications are shown in Table 11,
“
32.768 kHz Oscillator
Specifications
”
.
To drive the 32.768 kHz crystal pins from an external source:
Drive the TEXTAL pin with a digital signal that has 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 per 1
μ
s. 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 TXTAL pin or drive it complementary to the TEXTAL pin, with the same voltage
level, slew rate, and input current restrictions.
Table 11. 32.768 kHz Oscillator Specifications
Symbol
Description
Min
Typical
Max
Units
Crystal Specifications - Typical is FOX NC38
FXT
Crystal Frequency, TXTAL/TEXTAL
32.768
kHz
LMT
Motional Inductance, TXTAL/TEXTAL
6827.81
H
CMT
Motional Capacitance, TXTAL/TEXTAL
3.455
fF
RMT
Motional Resistance, TXTAL/TEXTAL
6
16
35
k
COT
Shunt Capacitance TXTAL to TEXTAL
1.6
pF
CLT
Load Capacitance TXTAL/TEXTAL
12.5
pF
Amplifier Specifications
VIH_X
Input High Voltage, TXTAL
0.8*VCC
VCC
V
VIL_X
Input Low Voltage, TXTAL
VSS
0.2*VCC
V
IIN_XT
Input Leakage, TXTAL
1
A
CIN_XT
Input Capacitance, TXTAL/TEXTAL
18
25
pF
tS_XT
Stabilization Time
2
-
10
s
Board Specifications
RP_XT
Parasitic Resistance, TXTAL/TEXTAL to
any node
20
M
CP_XT
Parasitic Capacitance, TXTAL/TEXTAL,
total
5
pF
COP_XT
Parasitic Shunt Capacitance, TXTAL to
TEXTAL
0.4
pF
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