Product data
LPC1769_68_67_66_65_64_63 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 9.5 — 24 June 2014 57 of 89
NXP Semiconductors
LPC1769/68/67/66/65/64/63
32-bit ARM Cortex-M3 microcontroller
12.3 Internal oscillators
[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.
12.4 I/O pins
[1] Applies to standard I/O pins.
Table 12. Dynamic characteristic: internal oscillators
T
amb
=
40
C to +85
C; 2.7 V
V
DD(REG)(3V3)
3.6 V.
[1]
Symbol Parameter Conditions Min Typ
[2]
Max Unit
f
osc(RC)
internal RC oscillator frequency - 3.96 4.02 4.04 MHz
f
i(RTC)
RTC input frequency - - 32.768 - kHz
Conditions: Frequency values are typical values. 4 MHz 1 % accuracy is guaranteed for
2.7 V V
DD(REG)(3V3)
3.6 V and T
amb
= 40 Cto+85C. Variations between parts may cause
the IRC to fall outside the 4 MHz 1 % accuracy specification for voltages below 2.7 V.
Fig 17. Internal RC oscillator frequency versus temperature
002aaf107
temperature (°C)
-40 853510 60-15
4.024
4.032
4.020
4.028
4.036
f
osc(RC)
(MHz)
4.016
V
DD(REG)(3V3)
= 3.6 V
3.3 V
3.0 V
2.7 V
2.4 V
Table 13. Dynamic characteristic: I/O pins
[1]
T
amb
=
40
C to +85
C; V
DD(3V3)
over specified ranges.
Symbol Parameter Conditions Min Typ Max Unit
t
r
rise time pin configured as output 3.0 - 5.0 ns
t
f
fall time pin configured as output 2.5 - 5.0 ns