LPC540xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
Table 35. Dynamic characteristic: oscillator …continued
Tamb = 40 C to +105 C; 1.71 V VDD 3.6 V.[1]
Symbol Parameter Conditions
High-frequency mode (20 - 25 MHz)[5]
Min
Typ[2]
Max
Unit
[3]
tjit(per)
period jitter time
20 MHz crystal
25 MHz crystal
-
-
4.3
3.7
-
-
ps
ps
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
[3] Indicates RMS period jitter.
[4] Select Low Frequency range = 0 in the SYSOSCCTRL register.
[5] Select High Frequency = 1 in the SYSOSCCTRL register.
11.9 RTC oscillator
See Section 13.5 for connecting the RTC oscillator to an external clock source.
Table 36. Dynamic characteristic: RTC oscillator
Tamb = 40 C to +105 C; 1.71 VDD 3.6[1]
Symbol Parameter
fi input frequency
Conditions
Min
Typ[1]
Max
Unit
-
-
32.768
-
kHz
[1] Parameters are valid over operating temperature range unless otherwise specified.
[2] Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
LPC540xx
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 1.8 — 22 June 2018
116 of 168
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