Microchip Technology DV320032 Datenbogen
PIC32MX330/350/370/430/450/470
DS60001185C-page 286
2012-2013 Microchip Technology Inc.
TABLE 30-18: PLL CLOCK TIMING SPECIFICATIONS
AC CHARACTERISTICS
Standard Operating Conditions: 2.3V to 3.6V
(unless otherwise stated)
Operating temperature
Operating temperature
-40°C
T
A
+85°C for Industrial
-40°C
T
A
+105°C for V-temp
Param.
No.
Symbol
Characteristics
(1)
Min.
Typical
Max.
Units
Conditions
OS50
F
PLLI
PLL Voltage Controlled
Oscillator (VCO) Input
Frequency Range
3.92
—
5
MHz ECPLL, HSPLL, XTPLL,
FRCPLL modes
OS51
F
SYS
On-Chip VCO System
Frequency
60
—
120
MHz
—
OS52
T
LOCK
PLL Start-up Time (Lock Time)
—
—
2
ms
—
OS53
D
CLK
CLKO Stability
(2)
(Period Jitter or Cumulative)
-0.25
—
+0.25
%
Measured over 100 ms
period
period
Note 1: These parameters are characterized, but not tested in manufacturing.
2: This jitter specification is based on clock-cycle by clock-cycle measurements. To get the effective jitter for
individual time-bases on communication clocks, use the following formula:
For example, if SYSCLK = 40 MHz and SPI bit rate = 20 MHz, the effective jitter is as follows:
EffectiveJitter
D
CLK
SYSCLK
CommunicationClock
----------------------------------------------------------
--------------------------------------------------------------
=
EffectiveJitter
D
CLK
40
20
20
------
--------------
D
CLK
1.41
--------------
=
=
TABLE 30-19: INTERNAL FRC ACCURACY
AC CHARACTERISTICS
Standard Operating Conditions: 2.3V to 3.6V
(unless otherwise stated)
Operating temperature
Operating temperature
-40°C
T
A
+85°C for Industrial
-40°C
T
A
+105°C for V-temp
Param.
No.
Characteristics
Min.
Typical
Max.
Units
Conditions
Internal FRC Accuracy @ 8.00 MHz
(1)
F20b
FRC
-0.9
—
+0.9
%
—
Note 1: Frequency calibrated at 25°C and 3.3V. The TUN bits can be used to compensate for temperature drift.
TABLE 30-20: INTERNAL LPRC ACCURACY
AC CHARACTERISTICS
Standard Operating Conditions: 2.3V to 3.6V
(unless otherwise stated)
Operating temperature
Operating temperature
-40°C
T
A
+85°C for Industrial
-40°C
T
A
+105°C for V-temp
Param.
No.
Characteristics
Min.
Typical
Max.
Units
Conditions
LPRC @ 31.25 kHz
(1)
F21
LPRC
-15
—
+15
%
—
Note 1: Change of LPRC frequency as V
DD
changes.