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| 型號： | SAK-TC1765T-L40EB |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, MROM, 40 MHz, MICROCONTROLLER, PBGA260 |
| 封裝： | PLASTIC, LBGA-260 |
| 文件頁數(shù)： | 52/88頁 |
| 文件大小： | 1274K |
| 代理商： | SAK-TC1765T-L40EB |
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TC1765
Data Sheet
52
V1.2, 2002-12
Preliminary
Recommended Oscillator Circuits
The oscillator circuit, designed to work with both, an external crystal oscillator or an
external stable clock source, basically consists of an inverting amplifier with XTAL1 as
input and XTAL2 as output. When using a crystal, a proper external oscillator circuitry
must be used, connected to both pins, XTAL1 and XTAL2. The on-chip oscillator
frequency can be within the range of 4 MHz to 16 MHz. When using an external clock
signal it must be connected to XTAL1. XTAL2 is left open (unconnected). For direct drive
operation without PLL, the frequency of an external clock must not exceed 40 MHz.
Figure 17 shows the recommended external oscillator circuitries for both operating
modes, external crystal mode and external input clock mode.
Figure 17
Oscillator Circuitries
For the oscillator of the TC1765 the following external passive components are
recommended:
– Crystal: max. 16 MHz
–
C1, C2: 10 pF
A block capacitor between
VDDOSC and VSSOSC is recommended, too.
–
C1, C2: 12 pF
Note: For crystal operation, it is strongly recommended to measure the negative
resistance in the final target system (layout) to determine the optimum parameters
for the oscillator operation. Please refer to the minimum and maximum values of
the negative resistance specified by the crystal supplier.
M C B 04996
TC 1765
O scillator
V
DD O S C
V
SS O S C
C
1
4-16
MH z
C
2
XT A L1
XT A L2
TC 1765
O scillator
V
DD O S C
V
SSO SC
XT AL 1
XT AL 2
Exte rna l
C loc k S ign al
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