ICS501B

LOCO™ PLL CLOCK MULTIPLIER

CLOCK MULTIPLIER

IDT™ / ICS™ LOCO™ PLL CLOCK MULTIPLIER

3

ICS501B

REV D 120307

External Components

Decoupling Capacitor

As with any high-performance mixed-signal IC, the

ICS501B 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 ICS501B to minimize lead inductance. No

external power supply filtering is required for the

ICS501B.

Series Termination Resistor

A 33

Ωterminating resistor can be used next to the CLK

pin for trace lengths over one inch.

Crystal Load Capacitors

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.

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 ICS501B. 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.

Recommended Operation Conditions

Item

Rating

Supply Voltage, VDD

7 V

All Inputs and Outputs

-0.5 V to VDD+0.5 V

Ambient Operating Temperature

-40 to +85

° C

Storage Temperature

-65 to +150

° C

Soldering Temperature

260

° C

Parameter

Min.

Typ.

Max.

Units

Ambient Operating Temperature

0

+70

° C

Power Supply Voltage (measured in respect to GND)

+3.14

+5.25

V