CF745 datasheet(63/217 Pages) MICROCHIP

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Preliminary

DS30453B-page 63

PIC16C52

PIC16C5X

10.4

Timing Diagrams and Speciﬁcations

FIGURE 10-2: EXTERNAL CLOCK TIMING - PIC16C52

TABLE 10-1:

EXTERNAL CLOCK TIMING REQUIREMENTS - PIC16C52

AC Characteristics

Standard Operating Conditions (unless otherwise speciﬁed)

Operating Temperature

°C ≤ TA ≤ +70°C (commercial)

–40

°C ≤ TA ≤ +85°C (industrial)

Operating Voltage VDD range is described in Section 10.1.

Parameter

No.

Sym

Characteristic

Min

Typ

(1)

Max

Units

Conditions

FOSC

External CLKIN Frequency

(2)

—

MHz

XT osc mode

Oscillator Frequency

(2)

—

MHz

RC osc mode

0.1

—

MHz

XT osc mode

1TOSC

External CLKIN Period

(2)

250

—

RC osc mode

250

—

XT osc mode

Oscillator Period

(2)

250

—

RC osc mode

250

—

10,000

XT osc mode

2TCY

Instruction Cycle Time

(3)

—

4/FOSC

——

TosL, TosH

Clock in (OSC1) Low or High Time

85*

—

XT oscillator

TosR, TosF Clock in (OSC1) Rise or Fall Time

—

25*

XT oscillator

These parameters are characterized but not tested.

Note 1:

Data in the Typical (“Typ”) column is at 5V, 25

°C unless otherwise stated. These parameters are for design guidance only

and are not tested.

All speciﬁed values are based on characterization data for that particular oscillator type under standard operating condi-

tions with the device executing code. Exceeding these speciﬁed limits may result in an unstable oscillator operation and/or

higher than expected current consumption.

When an external clock input is used, the “max” cycle time limit is “DC” (no clock) for all devices.

Instruction cycle period (TCY) equals four times the input oscillator time base period.

OSC1

CLKOUT

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