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MRF49XA
TABLE 5-7:
OTHER TIMING PARAMETERS AC CHARACTERISTICS (1)
Parameters
Transmitter Switch On Time
Receiver Switch On Time
Transmitter to Receiver Switch
Time
Condition
Synthesizer off, crystal oscillator
on with 10 MHz step
Synthesizer off, crystal oscillator
on with 10 MHz step
Synthesizer and crystal oscillator
on during TX/RX change with 10
Min
—
—
—
Typ
250
250
150
Max
—
—
—
Unit
μ s
μ s
μ s
MHz step
Receiver to Transmitter Switch
Time
Synthesizer and crystal oscillator
on during RX/TX change with 10
—
150
—
μ s
MHz step
Crystal Load Capacitance (See
Programmable in 0.5 pF steps,
8.5
—
16
pF
Crystal Selection Guide)
tolerance ±10%
Crystal Oscillator Start-up Time
Default capacitance bank setting,
—
2
7
ms
crystal ESR <50 Ω. Crystal load
capacitance = 16 pF. (2)
Internal POR Time-out
Wake-up Timer Clock Accuracy
After V DD has reached 90% of the
final value (3)
Crystal oscillator must be enabled
—
—
—
±10
100
—
ms
%
to ensure proper calibration at the
start-up (2)
Digital Input Capacitance
Digital Output Rise/Fall Time
—
15 pF pure capacitive load
—
—
—
—
2
10
pF
ns
Note 1:
2:
3:
Typical Values: T A = 25°C, V DD = 3.3V.
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.
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.
? 2009-2011 Microchip Technology Inc.
Preliminary
DS70590C-page 83
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