MRF49XA Datasheet, PDF (83/102 Pages) Microchip Technology – ISM Band Sub-GHz RF Transceiver

MRF49XA
TABLE 5-7: OTHER TIMING PARAMETERS AC CHARACTERISTICS⁽¹⁾
Parameters
Condition
Min
Typ
Max
Unit
Transmitter Switch On Time
Synthesizer off, crystal oscillator
—
250
—
μs
on with 10 MHz step
Receiver Switch On Time
Synthesizer off, crystal oscillator
—
250
—
μs
on with 10 MHz step
Transmitter to Receiver Switch Synthesizer and crystal oscillator
—
150
—
μs
Time
on during TX/RX change with
10 MHz step
Receiver to Transmitter Switch Synthesizer and crystal oscillator
—
150
—
μs
Time
on during RX/TX change with
10 MHz step
Crystal Load Capacitance (See Programmable in 0.5 pF steps,
8.5
—
Crystal Selection Guide)
tolerance ±10%
16
pF
Crystal Oscillator Start-up Time Default capacitance bank setting,
—
2
crystal ESR < 50Ω. Crystal load
capacitance = 16 pF.⁽²⁾
7
ms
Internal POR Time-out
After VDD has reached 90% of the
—
final value⁽³⁾
—
100
ms
Wake-up Timer Clock Accuracy Crystal oscillator must be enabled
—
±10
—
%
to ensure proper calibration at the
start-up⁽²⁾
Digital Input Capacitance
—
—
—
2
pF
Digital Output Rise/Fall Time
15 pF pure capacitive load
—
—
10
ns
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.
© 2009 Microchip Technology Inc.
Preliminary
DS70590B-page 81