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XC164CS-16F Datasheet, PDF (69/78 Pages) Infineon Technologies AG – 16-Bit Single-Chip Microcontroller with C166SV2 Core
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4.4.3 External Clock Drive XTAL1
XC164-16
Derivatives
Electrical Parameters
Table 19 External Clock Drive Characteristics (Operating Conditions apply)
Parameter
Symbol
Limit Values
Unit
Min.
Max.
Oscillator period
tOSC SR 25
2501)
ns
High time2)
t1
SR 6
–
ns
Low time2)
t2
SR 6
–
ns
Rise time2)
t3
SR –
8
ns
Fall time2)
t4
SR –
8
ns
1) The maximum limit is only relevant for PLL operation to ensure the minimum input frequency for the PLL.
2) The clock input signal must reach the defined levels VILC and VIHC.
t1
0.5 VDDI
t3
t2
t OSC
t4
V IHC
V ILC
MCT05572
Figure 17 External Clock Drive XTAL1
Note: If the on-chip oscillator is used together with a crystal or a ceramic resonator, the
oscillator frequency is limited to a range of 4 MHz to 16 MHz.
It is strongly recommended to measure the oscillation allowance (negative
resistance) in the final target system (layout) to determine the optimum
parameters for the oscillator operation. Please refer to the limits specified by the
crystal supplier.
When driven by an external clock signal it will accept the specified frequency
range. Operation at lower input frequencies is possible but is verified by design
only (not subject to production test).
Data Sheet
67
V2.2, 2006-03
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