XC2220U Datasheet, PDF (85/105 Pages) Infineon Technologies AG – 16/32-Bit Single-Chip Microcontroller with 32-Bit Performance

XC2220U
XC2000 Family / Compact Line
Electrical Parameters
4.7.3 External Clock Input Parameters
These parameters specify the external clock generation for the XC2220U. The clock can
be generated in two ways:
• By connecting a crystal or ceramic resonator to pins XTAL1/XTAL2.
• By supplying an external clock signal. This clock signal can be supplied either to
pin XTAL1 (core voltage domain) or to pin CLKIN1 (IO voltage domain).
If connected to CLKIN1, the input signal must reach the defined input levels V_IL and V_IH.
If connected to XTAL1, a minimum amplitude V_AX1 (peak-to-peak voltage) is sufficient for
the operation of the on-chip oscillator.
Note: The given clock timing parameters (t₁ … t₄) are only valid for an external clock
input signal.
Note: Operating Conditions apply.
Table 29 External Clock Input Characteristics
Parameter
Symbol
Values
Unit Note /
Min. Typ. Max.
Test Condition
Oscillator frequency
f_OSC SR 4
−
40
MHz Input= Clock
Signal
4
−
16
MHz Input= Crystal
or Resonator
XTAL1 input current
absolute value
|I_IL| CC −
−
20
μA
Input clock high time
t₁ SR 6
−
−
ns
Input clock low time
t₂ SR 6
−
−
ns
Input clock rise time
t₃ SR −
8
8
ns
Input clock fall time
t₄ SR −
8
8
ns
Input voltage amplitude on V_AX1 SR 0.3 x −
−
V
f_OSC≥ 4 MHz;
XTAL1¹⁾
V_DDIM
f_OSC≤ 16 MHz
0.4 x −
−
V
f_OSC≥ 16 MHz;
V_DDIM
f_OSC≤ 25 MHz
0.5 x −
−
V
f_OSC≥ 25 MHz;
V_DDIM
f_OSC≤ 40 MHz
Input voltage range limits V_IX1 SR -1.7 + −
1.7 V
2)
for signal on XTAL1
V_DDIM
1) The amplitude voltage V_AX1 refers to the offset voltage V_OFF. This offset voltage must be stable during the
operation and the resulting voltage peaks must remain within the limits defined by V_IX1.
Data Sheet
81
V1.2, 2012-07