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参数资料
| 型号： | QLPXA263B1C400 |
| 厂商： | INTEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, 400 MHz, RISC PROCESSOR, PBGA294 |
| 封装： | 13 X 13 MM, 1.4MM PITCH, PLASTIC, TPBGA-294 |
| 文件页数： | 21/44页 |
| 文件大小： | 1302K |
| 代理商： | QLPXA263B1C400 |
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Electrical Specifications
28
Intel PXA255 Processor Electrical, Mechanical, and Thermal Specification
4.6
Oscillator Electrical Specifications
The processor contains two oscillators, each for a specific crystal: a 32.768-kHz oscillator and a
3.6864-MHz oscillator. When choosing a crystal, match the crystal parameters as closely as
possible.
4.6.1
32.768-kHz Oscillator Specifications
The 32.768-kHz oscillator is connected between the TXTAL (amplifier input) and TEXTAL
(amplified output). Table 13, “32.768-kHz Oscillator Specifications” shows the 32.768-kHz
specifications.
Table 12. Standard Input, Output, and I/O Pin AC Operating Conditions
Symbol
Description
Min
Typical
Max
Units
CIN
Input capacitance, all standard input and
IO pins
10
pF
COUT_H
Output capacitance, all standard high-
strength output and IO pins
251
501
pF
tdF_H
Output de-rating, falling edge on all
standard, high-strength output and I/O
pins, from 50pF load.
ns/pF
tdR_H
Output de-rating, rising edge on all
standard, high-strength output and I/O
pins, from 50pF load.
ns/pF
NOTE: 1AC specifications guaranteed for loads in this range. All testing is done at 50pF
Table 13. 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
ESR
Equivalent series resistance, TXTAL/TEXTAL
6
—
65
k
P
Drive Level
—
1
uW
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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