Datasheet

 2011-2013 Microchip Technology Inc. DS70657G-page 413
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
TABLE 30-18: PLL CLOCK TIMING SPECIFICATIONS
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V
(unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param
No.
Symbol Characteristic Min. Typ.
(1)
Max. Units Conditions
OS50 F
PLLI PLL Voltage Controlled Oscillator
(VCO) Input Frequency Range
0.8 — 8.0 MHz ECPLL, XTPLL modes
OS51 F
SYS On-Chip VCO System Frequency 120 — 340 MHz
OS52 T
LOCK PLL Start-up Time (Lock Time) 0.9 1.5 3.1 ms
OS53 DCLK CLKO Stability (Jitter)
(2)
-3 0.5 3 %
Note 1: Data in “Typical” column is at 3.3V, +25°C unless otherwise stated. Parameters are for design guidance
only and are not tested.
2: This jitter specification is based on clock cycle-by-clock cycle measurements. To get the effective jitter for
individual time bases, or communication clocks used by the application, use the following formula:
For example, if F
OSC = 120 MHz and the SPIx bit rate = 10 MHz, the effective jitter is as follows:
Effective Jitter
D
CLK
FOSC
Time Base or Communication Clock
---------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------=
Effective Jitter
D
CLK
120
10
---------
--------------
DCLK
12
--------------
DCLK
3.464
--------------===
TABLE 30-19: INTERNAL FRC ACCURACY
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V (unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param
No.
Characteristic Min. Typ. Max. Units Conditions
Internal FRC Accuracy @ FRC Frequency = 7.37 MHz
(1)
F20a FRC -1.5 0.5 +1.5 % -40°C  TA -10°C VDD = 3.0-3.6V
-1 0.5 +1 % -10°C  T
A +85°C VDD = 3.0-3.6V
F20b FRC -2 1 +2 % +85°C  T
A  +125°C VDD = 3.0-3.6V
Note 1: Frequency is calibrated at +25°C and 3.3V. TUNx bits can be used to compensate for temperature drift.
TABLE 30-20: INTERNAL LPRC ACCURACY
AC CHARACTERISTICS
Standard Operating Conditions: 3.0V to 3.6V (unless otherwise stated)
Operating temperature -40°C  TA  +85°C for Industrial
-40°C  T
A  +125°C for Extended
Param
No.
Characteristic Min. Typ. Max. Units Conditions
LPRC @ 32.768 kHz
(1)
F21a LPRC -30 — +30 % -40°C  TA  -10°C VDD = 3.0-3.6V
-20 — +20 % -10°C  TA  +85°C VDD = 3.0-3.6V
F21b LPRC -30 — +30 % +85°C  T
A  +125°C VDD = 3.0-3.6V
Note 1: The change of LPRC frequency as V
DD changes.