MCP2122-E/SNG Просмотр технического описания (PDF) - Microchip Technology

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производитель

MCP2122-E/SNG

Infrared Encoder/Decoder

Microchip Technology 

4.3 Timing Diagrams and Specifications

FIGURE 4-3:

EXTERNAL CLOCK TIMING

Q4

16XCLK

Q1

Q2

1

Q3

3

3

MCP2122

Q4

Q1

4

4

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

1

TXCLK External 16XCLK Period

542.5

—

—

ns

(2, 3)

1A FXCLK External 16XCLK

Frequency (2, 3)

1C

EXCLK Clock Error (4, 5)

DC

— 1.8432 MHz

—

—

±2

% Note 5

3 TXCLKL, Clock in (16XCLK)

TXCLKH Low or High Time

50

—

—

ns

4 TXCLKR, Clock in (16XCLK)

TXCLKF Rise or Fall Time (5)

—

—

7.5

ns 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.

 2004 Microchip Technology Inc.

Preliminary

DS21894B-page 19

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