DSPIC33EP128GS708 datasheet(393/484 Pages) MICROCHIP

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DS70005258C-page 393

dsPIC33EPXXXGS70X/80X FAMILY

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

 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

0.8

—

8.0

MHz ECPLL, XTPLL modes

OS51

FVCO

On-Chip VCO System Frequency

120

—

340

MHz

OS52

TLOCK

PLL Start-up Time (Lock Time)

0.9

1.5

3.1

OS53

DCLK

CLKO Stability (Jitter)(2)

-3

0.5

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: 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 FOSC = 120 MHz and the SPIx bit rate = 10 MHz, the effective jitter is as follows:

Effective Jitter

DCLK

FOSC

Time Base or Communication Clock

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

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

Effective Jitter

DCLK

120

---------

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

DCLK

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

DCLK

3.464

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

===

TABLE 30-19: AUXILIARY 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

 TA  +125°C for Extended

Param

No.

Symbol

Characteristic

Min

Typ(1)

Max

Units

Conditions

OS56

FHPOUT

On-Chip 16x PLL CCO

Frequency

112

118

120

MHz

OS57

FHPIN

On-Chip 16x PLL Phase

Detector Input Frequency

7.0

7.37

7.5

MHz

OS58

TSU

Frequency Generator Lock

Time

——

µs

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 in manufacturing.

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