DSPIC33EP128GS708 datasheet(392/484 Pages) MICROCHIP

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dsPIC33EPXXXGS70X/80X FAMILY

DS70005258C-page 392

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FIGURE 30-2:

EXTERNAL CLOCK TIMING

OSC1

CLKO

OS20

OS30

OS40

OS41

OS31

OS25

OS31

TABLE 30-17: EXTERNAL CLOCK TIMING REQUIREMENTS

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.

Sym

Characteristic

Min.

Typ.(1)

Max.

Units

Conditions

OS10

FIN

External CLKI Frequency

(External clocks allowed only

in EC and ECPLL modes)

—

MHz

Oscillator Crystal Frequency

3.5

—

MHz

OS20

TOSC

TOSC = 1/FOSC

8.33

—

+125°C

TOSC = 1/FOSC

7.14

—

+85°C

OS25

TCY

Instruction Cycle Time(2)

16.67

—

+125°C

Instruction Cycle Time(2)

14.28

—

+85°C

OS30

TosL,

TosH

External Clock in (OSC1)

High or Low Time

0.45 x TOSC

—

0.55 x TOSC

OS31

TosR,

TosF

External Clock in (OSC1)

Rise or Fall Time

—

OS40

TckR

CLKO Rise Time(3,4)

—5.2

—

OS41

TckF

CLKO Fall Time(3,4)

—5.2

—

OS42

External Oscillator

Transconductance(4)

—

mA/V HS, VDD = 3.3V,

TA = +25°C

—6

—

mA/V XT, VDD = 3.3V,

TA = +25°C

Note 1:

Data in “Typ.” column is at 3.3V, +25°C unless otherwise stated.

Instruction cycle period (TCY) equals two times the input oscillator time base period. All specified values

are based on characterization data for that particular oscillator type, under standard operating conditions,

with the device executing code. Exceeding these specified limits may result in an unstable oscillator

operation and/or higher than expected current consumption. All devices are tested to operate at

“Minimum” values with an external clock applied to the OSC1 pin. When an external clock input is used,

the “Maximum” cycle time limit is “DC” (no clock) for all devices.

Measurements are taken in EC mode. The CLKO signal is measured on the OSC2 pin.

This parameter is characterized but not tested in manufacturing.

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