MCP2155 datasheet(21/38 Pages) MICROCHIP

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Preliminary

DS21894C-page 21

MCP2122

4.3

Timing Diagrams and Specifications

FIGURE 4-3:

EXTERNAL CLOCK TIMING

TABLE 4-3:

EXTERNAL CLOCK TIMING 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.

Sym

Characteristic

Min

Typ(1)

Max

Units

Conditions

1TXCLK

External 16XCLK Period (2, 3)

542.5

—

FXCLK

External 16XCLK

Frequency (2, 3)

—

1.8432

MHz

EXCLK

Clock Error (4, 5)

—

±2

Note 5

3TXCLKL,

TXCLKH

Clock in (16XCLK)

Low or High Time

—

4TXCLKR,

TXCLKF

Clock in (16XCLK)

Rise or Fall Time (5)

—

7.5

Note 5

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

operating 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: A duty cycle of no more than 60/40 (High-Time/Low-Time or Low-Time/High-Time) is recommended for

external clock inputs.

4: This is the clock error from the desired clock frequency. The total system clock error includes the error from

the transmitter and the error of receiver (from the desired clock frequency). If the transmitter is 2% fast from

the target frequency, and the receiver is 2% slow from the target frequency, the total error is 4%.

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

guidance only.

16XCLK

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