PIC17C44-08SLASHP datasheet(184/240 Pages) MICROCHIP

184 / 240 page

PIC17C4X

DS30412C-page 184

Applicable Devices 42 R42 42A 43 R43 44

19.5

Timing Diagrams and Speciﬁcations

FIGURE 19-2: EXTERNAL CLOCK TIMING

TABLE 19-2:

EXTERNAL CLOCK TIMING REQUIREMENTS

Param

No.

Sym

Characteristic

Min

Typ†

Max

Units

Conditions

Fosc

External CLKIN Frequency

(Note 1)

—

MHz

EC osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

Oscillator Frequency

(Note 1)

—

MHz

RC osc mode

XT osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

LF osc mode

Tosc

External CLKIN Period

(Note 1)

125

62.5

30.3

—

EC osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

Oscillator Period

(Note 1)

250

125

62.5

30.3

500

—

1,000

—

RC osc mode

XT osc mode - 08 devices (8 MHz devices)

- 16 devices (16 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

LF osc mode

2TCY

Instruction Cycle Time

(Note 1)

121.2

4/Fosc

TosL,

TosH

Clock in (OSC1)

high or low time

10 ‡

—

EC oscillator

TosR,

TosF

Clock in (OSC1)

rise or fall time

—

5 ‡

EC oscillator

†

Data in “Typ” column is at 5V, 25˚C unless otherwise stated. These parameters are for design guidance only and are not

tested.

‡

These parameters are for design guidance only and are not tested, nor characterized.

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.

OSC1

OSC2 †

† In EC and RC modes only.

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