D301 datasheet(372/416 Pages) MICROCHIP

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PIC24FJ256GA705 FAMILY

DS30010118D-page 372

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FIGURE 32-3:

EXTERNAL CLOCK TIMING

TABLE 32-18: EXTERNAL CLOCK TIMING REQUIREMENTS

AC CHARACTERISTICS

Standard Operating Conditions: 2.0V 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

OS10

FOSC

External CLKI Frequency

(External clocks allowed

only in EC mode)

—

MHz

ECPLL (Note 2)

Oscillator Frequency

3.5

—

MHz

kHz

XTPLL

HSPLL

SOSC

OS20

TOSC

TOSC = 1/FOSC

—

See Parameter OS10 for

FOSC value

OS25

TCY

Instruction Cycle Time(3)

62.5

—

OS30

TosL,

TosH

External Clock in (OSCI)

High or Low Time

0.45 x TOSC

——

OS31

TosR,

TosF

External Clock in (OSCI)

Rise or Fall Time

—

OS40

TckR

CLKO Rise Time(4)

—15

OS41

TckF

CLKO Fall Time(4)

—15

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

only and are not tested.

2: Represents input to the system clock prescaler. PLL dividers and postscalers must still be configured so

that the system clock frequency does not exceed the maximum frequency shown in Figure 32-1.

3: 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 “Min” values with an

external clock applied to the OSCI/CLKI pin. When an external clock input is used, the “Max” cycle time limit

is “DC” (no clock) for all devices.

4: Measurements are taken in EC mode. The CLKO signal is measured on the OSCO pin. CLKO is low for the

Q1-Q2 period (1/2 TCY) and high for the Q3-Q4 period (1/2 TCY).

OSCI

CLKO

OS20

OS25

OS30

OS40

OS41

OS31

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