Nxp Semiconductors OM11043 数据表
LPC1769_68_67_66_65_64_63
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© 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.
Symbol
Parameter
Conditions
Min
Typ
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 C to +85 C. 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
85
35
10
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
3.0 V
2.7 V
2.4 V
Table 13.
Dynamic characteristic: I/O pins
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