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2014-09-0002

PT0140-6

09/23/14

3

PT7C4502

PLL Clock Multiplier

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

load capacitance in pF. Example: For a crystal with a 15

pF load capacitance, each crystal capacitor would be

30pF.

Maximum Ratings

StorageTemperature...................................................................................-65oC to +150oC

Inputs(Reference to GND)

Clock Output (Reference to GND).........................

Recommended operation conditions

Symbol

Description

Min

Type

Max

Unit

Operation Temperature

-40

-

+85

C

Supply voltage

3.0

-

5.5

V

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.