DSPIC33FJMC302ESS datasheet(246/330 Pages) MICROCHIP

246 / 330 page

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

DS70283K-page 246

TABLE 24-17: PLL CLOCK TIMING SPECIFICATIONS (VDD = 3.0V TO 3.6V)

AC CHARACTERISTICS

Standard Operating Conditions: 3.0V to 3.6V (unless otherwise stated)

Operating temperature

-40°C

≤TA ≤+85°C for Industrial

-40°C

≤TA ≤+125°C for Extended

Param

No.

Symbol

Characteristic

Min

Typ(1)

Max

Units

Conditions

OS50

FPLLI

PLL Voltage Controlled

Oscillator (VCO) Input

Frequency Range(2)

0.8

—

MHz ECPLL, XTPLL modes

OS51

FSYS

On-Chip VCO System

Frequency(3)

100

—

200

MHz

—

OS52

TLOCK

PLL Start-up Time (Lock Time)(3)

0.9

1.5

3.1

—

OS53

DCLK

CLKO Stability (Jitter)(3)

-3

0.5

Measured over 100 ms

period

Note 1: Data in “Typ” column is at 3.3V, 25°C unless otherwise stated. Parameters are for design guidance only

and are not tested.

2: These parameters are characterized by similarity, but are tested in manufacturing at 7.7 MHz input only.

3: These parameters are characterized by similarity, but are not tested in manufacturing. This specification is

based on clock cycle by clock cycle measurements. To calculate the effective jitter for individual time bases

or communication clocks use this formula:

Peripheral Clock Jitter

DCLK

FOSC

Peripheral Bit Rate Clock

--------------------------------------------------------------

⎝⎠

⎛⎞

------------------------------------------------------------------------

For example: Fosc = 32 MHz, DCLK = 3%, SPI bit rate clock, (i.e., SCK) is 2 MHz.

SPI SCK Jitter

DCLK

32 MHz

2 MHz

--------------------

⎝⎠

⎛⎞

------------------------------

----------

--------

0.75%

TABLE 24-18: AC CHARACTERISTICS: INTERNAL RC 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

≤TA ≤+125°C for Extended

Param

No.

Characteristic

Min

Typ

Max

Units

Conditions

Internal FRC Accuracy @ FRC Frequency = 7.37 MHz(1)

F20a

FRC

-2

—

-40°C

≤TA ≤+85°C

VDD = 3.0-3.6V

F20b

FRC

-5

—

-40°C

≤TA ≤+125°C

VDD = 3.0-3.6V

Note 1: Frequency calibrated at 25°C and 3.3V. TUN bits can be used to compensate for temperature drift.

TABLE 24-19: INTERNAL RC 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

≤TA ≤+125°C for Extended

Param

No.

Characteristic

Min

Typ

Max

Units

Conditions

LPRC @ 32.768 kHz(1,2)

F21a

LPRC

-15

±6

+15

-40°C

≤TA ≤+85°C

VDD = 3.0-3.6V

F21b

LPRC

-40

—

+40

-40°C

≤TA ≤+125°C

VDD = 3.0-3.6V

Note 1: Change of LPRC frequency as VDD changes.

2: LPRC impacts the Watchdog Timer Time-out Period (TWDT1). See Section 21.4 “Watchdog Timer

(WDT)” for more information.

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