Datasheet

LPC540xx All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet Rev. 1.8 — 22 June 2018 116 of 168
NXP Semiconductors
LPC540xx
32-bit ARM Cortex-M4 microcontroller
[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.
[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.
High-frequency mode (20 - 25 MHz)
[5]
t
jit(per)
period jitter time 20 MHz crystal
[3]
-4.3- ps
25 MHz crystal - 3.7 - ps
Table 35. Dynamic characteristic: oscillator …continued
T
amb
=  40  C to +105  C; 1.71 V  V
DD
 3.6 V.
[1]
Symbol Parameter Conditions Min Typ
[2]
Max Unit
Table 36. Dynamic characteristic: RTC oscillator
T
amb
=  40  C to +105  C; 1.71  V
DD
 3.6
[1]
Symbol Parameter Conditions Min Typ
[1]
Max Unit
f
i
input frequency - - 32.768 - kHz