MCP2140 datasheet(25/38 Pages) MICROCHIP

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Preliminary

DS21894C-page 25

MCP2122

FIGURE 4-7:

16XCLK AND THE TX AND TXIR WAVEFORMS

TABLE 4-7:

TX AND TXIR REQUIREMENTS

AC Characteristics

Standard Operating Conditions (unless otherwise specified)

Operating Temperature: –40

°C ≤ TA ≤ +125°C (Extended)

Operating Voltage VDD range is described in

Section 4.1 “DC Characteristics”.

Param.

No.

Symbol

Characteristic

Min

Typ (1)

Max

Units Conditions

IR113

TTXRF

TX pin rise time and fall time

—

Note 2

IR114

TTXJ

TX to 16XCLK jitter

—

TXCLK Note 2

IR120 TTXL2TXIRH TX falling edge (

↓) to

TXIR rising edge (

↑) (1)

7—

TXCLK

TTXIRPW TXIR pulse width

Smaller of

IR121A

—

TXCLK At 115200 baud

IR121B

1.41

3.5

µs

At 9600 baud (Note 3)

IR122

TTXIRP

TXIR bit period

—

TXCLK

20C

TTXIRR

TXIR pin rise time

—

VDD

≥ 2.7V (Note 2)

20D

—

VDD = 1.8V (Note 2)

21C

TTXIRF

TXIR pin fall time

—

Note 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.

2: These parameters (shaded) are characterized but are not tested. These values should be used for design

guidance only.

3: This specification is not tested. This value is from the design target

16XCLK

Data bit x

Data bit x+1

16 CLK

Bit Value

to TX

IR121A

6 CLK

TXIRI (3 * 16XCLK pulses)

IR113

IR122

IR113

IR114

IR115

TXIR Time Out

IR121C

TXIR pin

IR124

IR123

IR121B

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