650R-27ILF View Datasheet(PDF) - Integrated Device Technology

Part Name

Description

Manufacturer

650R-27ILF

NETWORKING CLOCK SOURCE

Integrated Device Technology 

ICS650-27

NETWORKING CLOCK SOURCE

CLOCK SYNTHESIZER

External Components

The ICS650-27 requires a minimum number of external

components for proper operation.

Decoupling Capacitor

Decoupling capacitors of 0.01µF must be connected

between each VDD and GND (pins 4 and 6, pins 16 and 14),

as close to the device as possible. For optimum device

performance, the decoupling capacitor should be mounted

on the component side of the PCB. Avoid the use of vias in

the decoupling circuit.

Series Termination Resistor

When the PCB trace between the clock outputs and the

loads are over 1 inch, series termination should be used. To

series terminate a 50Ω trace (a commonly used trace

impedance), place a 33Ωresistor in series with the clock line

as close to the clock output pin as possible. The nominal

impedance of the clock output is 20Ω.

Crystal Information

The crystal used should be a fundamental mode (do not use

third overtone), parallel resonant. Crystal capacitors should

be connected from pins X1 to ground and X2 to ground to

optimize the initial accuracy. The value of these capacitors

is given by the following equation:

Crystal caps (pF) = (CL - 6) x 2

In the equation, CL is the crystal load capacitance. So, for a

crystal with a 16pF load capacitance, two 20 pF [(16-6) x 2]

capacitors should be used.

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS650-27. 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

Supply Voltage, VDD

All Inputs and Outputs

Ambient Operating Temperature

Storage Temperature

Junction Temperature

Soldering Temperature

Rating

7V

-0.5 V to VDD+0.5 V

-40 to +85° C

-65 to +150° C

175° C

260° C

Recommended Operation Conditions

Parameter

Ambient Operating Temperature

Power Supply Voltage (measured in respect to GND)

Min.

-40

+3.0

Typ.

+3.3

Max.

+85

+3.6

Units

°C

V

IDT™ / ICS™ NETWORKING CLOCK SOURCE

4

ICS650-27 REV F 051310

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