P12C508 datasheet(57/84 Pages) MICROCHIP

57 / 84 page

Advance Information

DS40139A-page 57

PIC12C5XX

10.4

Timing Diagrams and Speciﬁcations

FIGURE 10-2: EXTERNAL CLOCK TIMING - PIC12C5XX

TABLE 10-1:

EXTERNAL CLOCK TIMING REQUIREMENTS - PIC12C5XX

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

EXTRC osc mode

—

MHz

XT osc mode

—

200

kHz

LP osc mode

Oscillator Frequency(2)

—

MHz

EXTRC osc mode

0.1

—

MHz

XT osc mode

—

200

kHz

LP osc mode

1TOSC

External CLKIN Period(2)

250

—

EXTRC osc mode

250

—

XT osc mode

—

LP osc mode

Oscillator Period(2)

250

—

EXTRC osc mode

250

—

10,000

XT osc mode

—

LP osc mode

2Tcy

Instruction Cycle Time(3)

—

4/FOSC

——

TosL, TosH Clock in (OSC1) Low or High Time

50*

—

XT oscillator

—

LP oscillator

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

—

25*

XT oscillator

—

50*

LP 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.

2: All speciﬁed values are based on characterization data for that particular oscillator type under standard oper-

ating conditions 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.

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

OSC1

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