MCP2140AT-ISLASHP datasheet(34/60 Pages) MICROCHIP

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MCP2140A

DS22050A-page 34

4.3

Timing Diagrams and Specifications

FIGURE 4-3:

EXTERNAL CLOCK TIMING

TABLE 4-3:

EXTERNAL CLOCK TIMING REQUIREMENTS

AC Specifications

Electrical Characteristics:

Standard Operating Conditions (unless otherwise specified):

Operating Temperature: -40

°C ≤ TA ≤ +85°C (industrial)

Operating Voltage VDD range is described in Section 4.1 “DC

Characteristics”

Param.

No.

Sym

Characteristic

Min

Typ(1)

Max

Units

Conditions

1TOSC

External CLKIN Period (3, 4)

271.3

—

271.3

—

Device Operation

Low Power mode

(PHACT drives Low)

Oscillator Period (3)

271.3

—

271.3

FOSC

External CLKIN

Frequency (3, 4)

3.6864

MHz

Oscillator Frequency (3)

3.6864

—

3.6864

MHz

FERR

Error in Frequency

—

± 0.01

ECLK

External Clock Error

—

± 0.01

3TosH,

TosL

Clock in (OSC1)

High or Low Time

100 (2)

——

4TosR,

TosF

External Clock in (OSC1)

Rise or Fall Time

—

85 (2)

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.

These parameters are for design guidance only and are not tested.

All specified values are based on oscillator characterization data under standard operating conditions.

Exceeding these specified limits may result in 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.

A duty cycle of no more than 60% (High time/Low time or Low time/High time) is recommended for external

clock inputs.

OSC1

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