PIC16LC71 datasheet(141/176 Pages) MICROCHIP

141 / 176 page

DS30272A-page 141

PIC16C71X

Applicable Devices

710 71 711 715

15.5

Timing Diagrams and Speciﬁcations

FIGURE 15-2: EXTERNAL CLOCK TIMING

TABLE 15-2:

EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

Fosc

External CLKIN Frequency

(Note 1)

—

MHz

XT osc mode

—

MHz

HS osc mode (-04)

—

MHz

HS osc mode (-20)

—

200

kHz

LP osc mode

Oscillator Frequency

(Note 1)

—

MHz

RC osc mode

0.1

—

MHz

XT osc mode

—

MHz

HS osc mode

—

MHz

HS osc mode

Tosc

External CLKIN Period

(Note 1)

250

—

XT osc mode

250

—

HS osc mode (-04)

—

HS osc mode (-20)

—

µs

LP osc mode

Oscillator Period

(Note 1)

250

—

RC osc mode

250

—

10,000

XT osc mode

250

—

1,000

HS osc mode (-04)

—

1,000

HS osc mode (-20)

—

µs

LP osc mode

TCY

Instruction Cycle Time (Note 1)

1.0

TCY

µs

TCY = 4/Fosc

TosL,

TosH

External Clock in (OSC1) High or

Low Time

—

XT oscillator

2.5

—

µs

LP oscillator

—

HS oscillator

TosR,

TosF

External Clock in (OSC1) Rise or

Fall Time

—

XT oscillator

—

LP oscillator

—

HS oscillator

†

Data in "Typ" column is at 5V, 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 con-

sumption. All devices are tested to operate at "min." values with an external clock applied to the OSC1/CLKIN pin.

When an external clock input is used, the "Max." cycle time limit is "DC" (no clock) for all devices. OSC2 is disconnected

(has no loading) for the PIC16C71.

OSC1

CLKOUT

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