PIC17C752-08SLASHP datasheet(232/320 Pages) MICROCHIP

232 / 320 page

PIC17C75X

DS30264A-page 232

Preliminary

20.5 Timing Diagrams and Speciﬁcations

FIGURE 20-2: EXTERNAL CLOCK TIMING

TABLE 20-2: 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)

- 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)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

LF osc mode

Tosc

External CLKIN Period

(Note 1)

125

30.3

—

EC osc mode - 08 devices (8 MHz devices)

- 25 devices (25 MHz devices)

- 33 devices (33 MHz devices)

Oscillator Period

(Note 1)

250

125

30.3

500

—

1,000

—

RC osc mode

XT osc mode - 08 devices (8 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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