PIC16LC554 datasheet(74/96 Pages) MICROCHIP

74 / 96 page

PIC16C55X(A)

DS40143B-page 74

Preliminary

10.5

Timing Diagrams and Speciﬁcations

FIGURE 10-2: EXTERNAL CLOCK TIMING

TABLE 10-2:

EXTERNAL CLOCK TIMING REQUIREMENTS

Parameter

No.

Sym

Characteristic

Min

Typ†

Max

Units Conditions

Fos

External CLKIN Frequency

(Note 1)

—

MHz

XT and RC osc mode, VDD=5.0V

—

MHz

HS osc mode

—

200

kHz

LP osc mode

Oscillator Frequency

(Note 1)

—

MHz

RC osc mode, VDD=5.0V

0.1

—

MHz

XT osc mode

—

MHz

HS osc mode

–

200

kHz

LP osc mode

Tosc

External CLKIN Period

(Note 1)

250

—

XT and RC osc mode

—

HS osc mode

—

µs

LP osc mode

Oscillator Period

(Note 1)

250

—

RC osc mode

250

—

10,000

XT osc mode

—

1,000

HS osc mode

—

µs

LP osc mode

TCY

Instruction Cycle Time (Note 1)

1.0

Fos/4

µs

TCY=FOS/4

TosL,

TosH

External Clock in (OSC1) High or

Low Time

100*

—

XT osc mode

—

µs

LP osc mode

20*

—

HS osc mode

TosR,

TosF

External Clock in (OSC1) Rise or

Fall Time

25*

—

XT osc mode

50*

—

LP osc mode

15*

—

HS osc mode

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 the 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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