MT9040 Zarlink Semiconductor, MT9040 Datasheet - Page 9

• Manufacturer Part Number: MT9040
• Manufacturer: Zarlink Semiconductor

The crystal should be a fundamental mode type - not
an overtone. The fundamental mode crystal permits
a simpler oscillator circuit with no additional filter
components and is less likely to generate spurious
responses. The crystal specification is as follows.
Frequency:
Tolerance:
Oscillation Mode:
Resonance Mode:
Load Capacitance:
Maximum Series Resistance:
Approximate Drive Level:
e.g., R1B23B32-20.0MHz
(20ppm absolute,
Reset Circuit
A simple power up reset circuit with about a 50us
reset low time is shown in Figure 7. Resistor R
protection only and limits current into the RST pin
during power down conditions. The reset low time is
not critical but should be greater than 300ns.
Figure 7 - Power-Up Reset Circuit
MT9040
RST
±
6ppm 0C to 50C, 32pF, 25
1kΩ
R
10kΩ
P
R
20MHz
As required
Fundamental
Parallel
32pF
35
1mW
+3.3V
Ω
10nF
C
Ω
)
P
is for
Advance Information
MT9040
9