ICS501
LOCO™ PLL CLOCK MULTIPLIER
CLOCK MULTIPLIER
Crystal Load Capacitors
External Components
The total on-chip capacitance is approximately 12 pF. 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.
Decoupling Capacitor
As with any high-performance mixed-signal IC, the ICS501
must be isolated from system power supply noise to perform
optimally.
A decoupling capacitor of 0.01µF must be connected
between VDD and the GND. It must be connected close to
the ICS501 to minimize lead inductance. No external power
supply filtering is required for the ICS501.
Series Termination Resistor
A 33Ωterminating resistor can be used next to the CLK pin
for trace lengths over one inch.
The value (in pF) of these crystal caps should equal (CL -12
pF)*2. In this equation, CL= crystal load capacitance in pF.
Example: For a crystal with a 16 pF load capacitance, each
crystal capacitor would be 8 pF [(16-12) x 2 = 8].
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS501. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Item
Rating
Supply Voltage, VDD
All Inputs and Outputs
7 V
-0.5 V to VDD+0.5 V
-40 to +85° C
-65 to +150°C
260°C
Ambient Operating Temperature
Storage Temperature
Soldering Temperature
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
+70
Units
°C
Ambient Operating Temperature (commercial)
Ambient Operating Temperature (industrial)
Power Supply Voltage (measured in respect to GND)
0
-40
+3.0
85
°C
+5.25
V
IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER
3
ICS501
REV Q 092209
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
