PT7C4502 Datasheet, PDF (3/6 Pages) Pericom Semiconductor Corporation – PLL Clock Multiplier

PT7C4502
PLL Clock Multiplier
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External Components
Decoupling Capacitor
As with any high-performance mixed-signal IC, the
PT7C4502 must be isolated from system power supply
noise to perform optimally. A decoupling capacitor of
0.01μF or 0.1uF must be connected between VCC and
the GND. It must be connected close to the PT7C4502
to minimize lead inductance. No external power supply
filtering is required for the PT7C4502.
Series Termination Resistor
A 33Ω terminating resistor can be used next to the
CLK pin for trace lengths over one inch.
Crystal Load Capacitors
There is no on-chip capacitance build-in chip. A
parallel resonant, fundamental mode crystal should be
used. The device crystal connections should include
pads for small capacitors from X1 to ground and from
X2 to ground. These capacitors are used to adjust the
stray capacitance of the board to match the nominally
required crystal load capacitance. Because load
capacitance can only be increased in this trimming
process, it is important to keep stray capacitance to a
minimum by using very short PCB traces (and no vias)
between the crystal and device. Crystal capacitors, if
needed, must be connected from each of the pins X1
and X2 to ground. The value (in pF) of these crystal
caps should equal C_L*2. In this equation, C_L= crystal
load capacitance in pF. Example: For a crystal with a 15
pF load capacitance, each crystal capacitor would be
30pF.
Maximum Ratings
Storage Temperature ................................................................................... -65oC to +150oC
SupplyVoltage to Ground Potential(V_CC).................................................-0.3Vto +7.0V
Inputs(Reference to GND) ............................................. -0.5V to Vcc + 0.5V
Clock Output (Reference to GND).........................-0.5V to Vcc + 0.5V
Soldering Temperature (Max of 10 seconds) ..............................260^OC
Recommended operation conditions
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Symbol
T_A
V_DD
Description
Operation Temperature
Supply voltage
Min
Type
Max
Unit
-40
-
+85
C
3.0
-
5.5
V
2014-09-0002
PT0140-6
09/23/14
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