PIC24FJ128GA310 datasheet(370/406 Pages) MICROCHIP

370 / 406 page

PIC24FJ128GA310 FAMILY

DS39996F-page 370

 2010-2011 Microchip Technology Inc.

FIGURE 32-3:

EXTERNAL CLOCK TIMING

OSCI

CLKO

OS20

OS25

OS30

OS40

OS41

OS31

TABLE 32-19: EXTERNAL CLOCK TIMING REQUIREMENTS

AC CHARACTERISTICS

Standard Operating Conditions: 2V to 3.6V (unless otherwise stated)

Operating temperature

-40°C

 TA  +85°C for Industrial

Param

No.

Symbol

Characteristic

Min

Typ(1)

Max

Units

Conditions

OS10 FOSC

External CLKI Frequency

(External clocks allowed

only in EC mode)

—

MHz

ECPLL

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(2)

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(3)

—

OS41 TckF

CLKO Fall Time(3)

—

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.

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.

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).

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