MRF49XA-ISLASHT datasheet(83/102 Pages) MICROCHIP

83 / 102 page

Preliminary

DS70590C-page 83

MRF49XA

TABLE 5-7:

OTHER TIMING PARAMETERS AC CHARACTERISTICS(1)

Note 1: Typical Values: TA = 25°C, VDD = 3.3V.

2: The crystal oscillator start-up time depends on the capacitance seen by the oscillator. Low capacitance and

low-ESR crystal are recommended with low parasitic PCB layout design.

3: During the Power-on Reset period, commands are not accepted by the chip. In case of Software Reset (see

WTSREG (Register 2-14)), the Reset time-out is typically 0.25 ms.

Parameters

Condition

Min

Typ

Max

Unit

Transmitter Switch On Time

Synthesizer off, crystal oscillator

on with 10 MHz step

—250

—

μs

Receiver Switch On Time

Synthesizer off, crystal oscillator

on with 10 MHz step

—250

—

μs

Transmitter to Receiver Switch

Time

Synthesizer and crystal oscillator

on during TX/RX change with 10

MHz step

—150

—

μs

Receiver to Transmitter Switch

Time

Synthesizer and crystal oscillator

on during RX/TX change with 10

MHz step

—150

—

μs

Crystal Load Capacitance (See

Crystal Selection Guide)

Programmable in 0.5 pF steps,

tolerance ±10%

8.5

—

Crystal Oscillator Start-up Time

Default capacitance bank setting,

crystal ESR <50

Ω. Crystal load

capacitance = 16 pF.(2)

—2

Internal POR Time-out

After VDD has reached 90% of the

final value(3)

——

100

Wake-up Timer Clock Accuracy

Crystal oscillator must be enabled

to ensure proper calibration at the

start-up(2)

—±10

—

Digital Input Capacitance

—

Digital Output Rise/Fall Time

15 pF pure capacitive load

—

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