LPC1857_53 NXP Semiconductors, LPC1857_53 Datasheet - Page 96

• Manufacturer Part Number: LPC1857_53
• Description: The LPC1857/53 are ARM Cortex-M3 based microcontrollers for embedded applications
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC1857_53
Objective data sheet
11.3 Crystal oscillator
11.4 IRC and RTC oscillators
Table 11.
T
[1]
[2]
[3]
[4]
[5]
[6]
Table 12.
T
[1]
[2]
Symbol
f
f
Symbol
Low-frequency mode (1-20 MHz)
t
High-frequency mode (20 - 25 MHz)
t
osc(RC)
i(RTC)
amb
amb
jit(per)
jit(per)
Parameters are valid over operating temperature range unless otherwise specified.
Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
Indicates RMS period jitter.
PLL-induced jitter is not included.
Select HF = 0 in the XTAL_OSC_CTRL register.
Select HF = 1 in the XTAL_OSC_CTRL register.
Parameters are valid over operating temperature range unless otherwise specified.
Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
=
=


40
40


Parameter
internal RC oscillator
frequency
RTC input frequency
Dynamic characteristic: oscillator
Dynamic characteristic: IRC and RTC oscillators
C to +85
C to +85
Parameter
period jitter time
period jitter time
All information provided in this document is subject to legal disclaimers.


C; V
C; <tbd>
Rev. 1 — 14 December 2011
DD(IO)

over specified ranges.
V
Conditions
5 MHz crystal
10 MHz crystal
15 MHz crystal
20 MHz crystal
25 MHz crystal
DD(IO)
[5]
[6]

Conditions
-
-
<tbd>.
[1]
32-bit ARM Cortex-M3 microcontroller
[3][4]
[3][4]
[1]
Min
-
-
-
-
-
Min
11.88
-
Typ
13.2
4.3
6.6
4.8
3.7
LPC1857/53
Typ
12.00
32.768
[2]
[2]
© NXP B.V. 2011. All rights reserved.
Max
-
-
-
-
-
Max
12.12
-
96 of 131
Unit
ps
ps
ps
ps
ps
Unit
MHz
kHz