MCP2140-ISO datasheet(30/58 Pages) MICROCHIP

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MCP2140

DS21790A-page 30

Preliminary

 2003 Microchip Technology Inc.

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

Param.

No.

Sym

Characteristic

Min

Typ(1)

Max

Units

Conditions

TOSC External CLKIN Period (2, 3)

90.422

—

90.422

—

Device Operation

Low Power mode

(PHACT drive Low)

Oscillator Period (2)

90.422

—

90.422

FOSC External CLKIN

Frequency (2, 3)

7.3728

MHz

Oscillator Frequency (2)

7.3728

—

7.3728

MHz

FERR Error in Frequency

—

± 0.01

ECLK External Clock Error

—

± 0.01

TosR,

TosF

Clock in (OSC1)

Rise or Fall Time

—

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 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.

3: 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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