IDT ICS5OSK482TILF Schematic [ru]

PRELIMINARY DATASHEET

48 MHZ USB CLOCK SOURCE ICS5OSK482

Description

The ICS5OSK482 is a low cost integrated clock synthesizer
solution designed for replacing crystals and crystal
oscillators.

The ICS5OSK482 generates a very accurate 48.00 MHz
clock output.

Block Diagram

VDD

X1

Crystal

Oscillator

X2

Features

• 14.31818 MHz crystal input

• The 48.00 MHz CLK output is USB2.0 reference clock

compliant

• Output duty cycle 45/55% (worst case)

• Advanced, low-power CMOS process

• Industrial temperature range (-40 to +85°C)

• Packaged in 5-pin TSOT

• 3.3 V supply voltage

• Pb (lead) free package available

• Short term C-C Jitter of 100 ps

PLL CLK

External capacitors are required
with a crystal input.

GND

IDT™ / ICS™

48 MHZ USB CLOCK SOURCE 1

ICS5OSK482 REV B 110805

ICS5OSK482
48 MHZ USB CLOCK SOURCE SYNTHESIZERS

Pin Assignment

X1

GND

CLK

1

2

3

5

X2

VDD

4

Pin Descriptions

Pin

Number

1 X1 Input 14.31818 MHz crystal input. Connect to a parallel resonant fundamental crystal.

2 GND Power Connect to ground.

3 CLK Output PLL output clock. Internal pull-down resistor.

4 VDD Power Connect to 3.3 V.

5 X2 Output 14.31818 MHz crystal output.

Pin

Name

Pin

Typ e

Pin Description

External Components

External Crystal

The ICS5OSK482 requires a 14.31818 MHz crystal. In
order to minimize ppm errors, the PCB should include pads
for crystal capacitors from pins X1 to ground and X2 to
ground to optimize the initial accuracy. The capacitor value
can be determined by tuning the PCB so that the error on
the reference output is equal to the initial crystal error.

Crystal Load Capacitors

The device crystal connections should include pads for
small capacitors from pins X1 to ground and 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 must be connected from each of the pins X1 and
X2 to ground.

The value (in pF) of these crystal caps should equal (C
pF) * 2. In the equation, C

= crystal load capacitance in pF.

L

Example: For a crystal with a 8 pF load capacitance, each
crystal capacitor would be 4 pF [(8-6) x 2 = 4].

IDT™ / ICS™

48 MHZ USB CLOCK SOURCE 2

L

-6

ICS5OSK482 REV B 110805

ICS5OSK482
48 MHZ USB CLOCK SOURCE SYNTHESIZERS

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS5OSK482. These ratings, which
are standard values for ICS 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

Max Supply Voltage, VDD 7 V

Logic Inputs -0.5 V to VDD+0.5 V

Ambient Operating Temperature -40 to +85°C

Storage Temperature -65 to +150°C

Junction Temperature 125°C

Soldering Temperature 260°C

Recommended Operation Conditions

Parameter Min. Typ. Max. Units

Ambient Operating Temperature -40 +85 °C

Power Supply Voltage (measured in respect to GND) +3.135 +3.3 +3.465 V

DC Electrical Characteristics

VDD=3.3 V ±5%, Ambient temperature -40 to +85°C, CL = 15 pF, unless stated otherwise

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 3.135 3.465 V

Output High Voltage V

Output Low Voltage V

IDD Operating Supply Current IDD No Load TBD mA

Short Circuit Current I

Input Capacitance C

Nominal Output Impedance 20 Ω

OH

OL

OS

I

= -12 mA 2.4 V

OH

I

= 12 mA 0.4 V

OL

CLK output ±70 mA

IN

4pF

IDT™ / ICS™

48 MHZ USB CLOCK SOURCE 3

ICS5OSK482 REV B 110805

ICS5OSK482
48 MHZ USB CLOCK SOURCE SYNTHESIZERS

AC Electrical Characteristics

VDD = 3.3 V ±5%, Ambient Temperature -40 to +85°C, CL = 15 pF, unless stated otherwise

Parameter Symbol Conditions Min. Typ. Max. Units

Input Frequency, crystal input f

Output Frequency f

Output Clock Rise Time t

Output Clock Fall Time t

Output Clock Duty Cycle t

Absolute Clock Period Jitter t

Note 1: Measured with a 15 pF load.

IN

OUT

OR

OF

DC

JA

0.8 to 2.0 V, Note 1 1 ns

2.0 to 0.8 V, Note 1 1 ns

1.5 V 45 50 60 %

Deviation from mean, Note 1 100 ps

14.31818 MHz

48 MHz

IDT™ / ICS™

48 MHZ USB CLOCK SOURCE 4

ICS5OSK482 REV B 110805

ICS5OSK482
48 MHZ USB CLOCK SOURCE SYNTHESIZERS

Package Outline and Package Dimensions (5-pin TSOT)

Package dimensions are kept current with JEDEC Publication No. 95

Millimeters

Symbol Min Max

A — 1.00
A1 0.01 0.10
A2 0.84 0.90

b0.300.45

c0.120.20
D 2.90 BASIC
E 2.80 BASIC

E1 1.60 BASIC

e 0.95 BASIC

e1 1.90 BASIC

L0.300.50

L1 0.60 REF
L2 0.25 BASIC

θ

aaa — 0.10

0° 8°

Ordering Information

Part / Order Number Marking Shipping Packaging Package Temperature

ICS5OSK482TILF 2TIL Tubes 5-pin TSOT -40 to +85° C

ICS5OSK482TILFT 2TIL Tape and Reel 5-pin TSOT -40 to +85° C

Parts that are ordered with a “LF” suffix to the part number are the Pb-Free configuration and are RoHS compliant.

While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no
responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No
other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications
such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not
recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS
does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.

IDT™ / ICS™

48 MHZ USB CLOCK SOURCE 5

ICS5OSK482 REV B 110805

ICS5OSK482
48 MHZ USB CLOCK SOURCE SYNTHESIZERS

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800 345 7015
[phone] (outside U.S.)

© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT an d the IDT logo are trademarks of Integrated Device
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