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TC290 Datasheet, PDF (364/476 Pages) Infineon Technologies AG – 32-Bit Single-Chip Micocontroller
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TC290 / TC297 / TC298 / TC299 BB-Step
Electrical SpecificationMHz Oscillator
3.10
MHz Oscillator
OSC_XTAL is used as accurate and exact clock source. OSC_XTAL supports 8 MHz to 40 MHz crystals external
outside of the device. Support of ceramic resonators is also provided.
Table 3-31 OSC_XTAL
Parameter
Symbol
Values
Unit Note / Test Condition
Min.
Typ.
Max.
Input current at XTAL1
Oscillator frequency
IIX1 CC
-25
-
fOSC SR
4
-
25
µA
VIN>0V ; VIN<VDDP3V
40
MHz Direct Input Mode
selected
8
-
Oscillator start-up time 1)
tOSCS CC -
-
Input high voltage at XTAL1 VIHBX SR 0.8
-
40
5 2)
VDDP3 +
0.5
MHz
ms
V
External Crystal Mode
selected
If shaper is bypassed
Input low voltage at XTAL1
VILBX SR -0.5
-
Input voltage at XTAL1
VIX SR
-0.5
-
0.4
V
VDDP3 + V
0.5
If shaper is bypassed
If shaper is not
bypassed
Input amplitude (peak to peak) VPPX SR 0.3 *
-
at XTAL1
VDDP3
VDDP3 + V
1.0
If shaper is not
bypassed; fOSC >
25MHz
0.4 *
-
VDDP3
VDDP3 + V
1.0
If shaper is not
bypassed; fOSC ≤
25MHz
Internal load capacitor
CL0 CC
2
2.35
2.7
pF
Internal load capacitor
CL1 CC
2
2.35
2.7
pF
Internal load capacitor
CL2 CC
3
3.5
4
pF
Internal load capacitor
CL3 CC
5.1
5.9
6.6
pF
1) tOSCS is defined from the moment when VDDP3 = 3.13V until the oscillations reach an amplitude at XTAL1 of 0.3 * VDDP3.
The external oscillator circuitry must be optimized by the customer and checked for negative resistance as recommended
and specified by crystal suppliers.
2) This value depends on the frequency of the used external crystal. For faster crystal frequencies this value decrease.
Note: It is strongly recommended to measure the oscillation allowance (negative resistance) in the final target
system (layout) to determine the optimal parameters for the oscillator operation. Please refer to the limits
specified by the crystal or ceramic resonator supplier.
Data Sheet
3-358
V 1.1 2015-05
TC290/TC297/TC298/TC299 BB-Step Data Sheet downloaded by saravanakumar maniyam (larsen and Toubro limited) at 08 Sep 2015 08:06
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