MCP2140A-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

MCP2140A-I/SO

IrDA® Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate

Microchip Technology 

MCP2140A

4.3 Timing Diagrams and Specifications

FIGURE 4-3:

EXTERNAL CLOCK TIMING

Q4

Q1

Q2

Q3

Q4

Q1

OSC1

1

4

4

3

3

2

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

1

TOSC External CLKIN Period (3, 4) 271.3

271.3

Oscillator Period (3)

271.3

—

271.3

ns Device Operation

—

—

ns Low Power mode

(PHACT drives Low)

—

271.3

ns

1A FOSC External CLKIN

Frequency (3, 4)

Oscillator Frequency (3)

3.6864 3.6864 3.6864 MHz

3.6864

— 3.6864 MHz

1B FERR Error in Frequency

—

—

± 0.01

%

1C ECLK External Clock Error

3 TosH, Clock in (OSC1)

TosL High or Low Time

4 TosR, External Clock in (OSC1)

TosF Rise or Fall Time

—

100 (2)

—

—

± 0.01

%

—

—

ns

—

85 (2)

ns

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

3: 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.

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

clock inputs.

DS22050A-page 34

© 2007 Microchip Technology Inc.

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