PIC16F631 datasheet(241/294 Pages) MICROCHIP

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DS41262D-page 239

PIC16F631/677/685/687/689/690

TABLE 17-2:

OSCILLATOR PARAMETERS

Standard Operating Conditions (unless otherwise stated)

Operating Temperature

-40°C

≤ TA ≤ +125°C

Param

No.

Sym

Characteristic

Freq

Tolerance

Min

Typ†

Max

Units

Conditions

OS06

TWARM

Internal Oscillator Switch

when running(3)

——

—

TOSC

Slowest clock

OS07

TSC

Fail-Safe Sample Clock

Period(1)

—

—21

—

LFINTOSC/64

OS08

HFOSC

Internal Calibrated

HFINTOSC Frequency(2)

±1%

7.92

8.0

8.08

MHz

VDD = 3.5V, 25°C

±2%

7.84

8.0

8.16

MHz

2.5V

≤ VDD ≤ 5.5V,

0°C

≤ TA ≤ +85°C

±5%

7.60

8.0

8.40

MHz

2.0V

≤ VDD ≤ 5.5V,

-40°C

≤ TA ≤ +85°C (Ind.),

-40°C

≤ TA ≤ +125°C (Ext.)

OS09*

LFOSC

Internal Uncalibrated

LFINTOSC Frequency

—

153145

kHz

OS10*

TIOSC ST

HFINTOSC Oscillator

Wake-up from Sleep

Start-up Time

—

5.5

μsVDD = 2.0V, -40°C to +85°C

—3.5

μsVDD = 3.0V, -40°C to +85°C

—3

μsVDD = 5.0V, -40°C to +85°C

These parameters are characterized but not tested.

†

Data in “Typ” column is at 5.0V, 25°C unless otherwise stated. These parameters are for design guidance only and are

not tested.

Note

Instruction cycle period (TCY) equals four 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 OSC1 pin.

When an external clock input is used, the ‘max’ cycle time limit is ‘DC’ (no clock) for all devices.

To ensure these oscillator frequency tolerances, VDD and VSS must be capacitively decoupled as close to the device as

possible. 0.1

μF and 0.01 μF values in parallel are recommended.

By design.

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