PIC12F635ESLASHSS datasheet(164/196 Pages) MICROCHIP

164 / 196 page

PIC12F635/PIC16F636/639

DS41232B-page 162

Preliminary

15.10 AC Characteristics: PIC12F635/PIC16F636/639 (Industrial, Extended)

FIGURE 15-4:

EXTERNAL CLOCK TIMING

TABLE 15-1:

EXTERNAL CLOCK TIMING REQUIREMENTS

Param

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

FOSC

External CLKIN Frequency(1)

—

kHz

LP Oscillator mode

—

MHz

XT Oscillator mode

—

MHz

HS Oscillator mode

—

MHz

EC Oscillator mode

Oscillator Frequency(1)

—

kHz

LP Oscillator mode

—

MHz

HFINTOSC Oscillator mode

—

MHz

RC Oscillator mode

0.1

—

MHz

XT Oscillator mode

—

MHz

HS Oscillator mode

1TOSC

External CLKIN Period(1)

—

μs

LP Oscillator mode

—

HS Oscillator mode

—

EC Oscillator mode

250

—

XT Oscillator mode

Oscillator Period(1)

200

μs

LP Oscillator mode

—

125

—

INTOSC Oscillator mode

250

—

RC Oscillator mode

250

—

10,000

XT Oscillator mode

—

1,000

HS Oscillator mode

2TCY

Instruction Cycle Time(1)

200

TCY

TCY = 4/FOSC

TosL,

TosH

External CLKIN (OSC1) High

External CLKIN Low

—

μs

LP oscillator, TOSC L/H duty cycle

20*

—

HS oscillator, TOSC L/H duty cycle

100*

—

XT oscillator, TOSC L/H duty cycle

4TosR,

TosF

External CLKIN Rise

External CLKIN Fall

—

50*

LP oscillator

—

25*

XT oscillator

—

15*

HS oscillator

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 1:

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 OSC1 pin. When an external clock input is used, the ‘max’ cycle

time limit is ‘DC’ (no clock) for all devices.

OSC1

CLKOUT

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