ICS5OSK481 [ICSI]

48 MHz Tiny USB Clock Source; 48 MHz的微型USB时钟源


型号：	ICS5OSK481
厂家：	INTEGRATED CIRCUIT SOLUTION INC
描述：	48 MHz Tiny USB Clock Source 48 MHz的微型USB时钟源时钟
文件：	总5页 (文件大小：107K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

P R E L I M I N A R Y I N F O R M AT I O N

ICS5OSK481

48 MHz Tiny USB Clock Source

Description

Features

The ICS5OSK481 is a low cost integrated clock

synthesizer solution designed for replacing crystals

and crystal oscillators.

• 25 MHz clock input

• The 48.00 MHz CLK output is USB2.0 reference

clock compliant

The ICS5OSK481 generates a very accurate 48.00

MHz clock output.

• 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

Block Diagram

VDD

Clock

Buffer

ICLK

PLL

CLK

GND

MDS 5OSK481 B

Revision 111805

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

P R E L I M I N A R Y I N F O R M AT I O N

ICS5OSK481

48 MHz Tiny USB Clock Source

Pin Assignment

O E

I C L K

G N D

C L K

V D D

Pin Descriptions

Number

Name

Type

Pin Description

ICLK

Input

25 MHz clock input. Connect to a parallel resonant fundamental crystal or

input clock.

GND

CLK

VDD

Power Connect to ground.

Output PLL output clock. Internal pull-down resistor.

Power Connect to 3.3 V.

Input

Output Enable pin. Internal pull-up resistor. OE=0 outputs tristate with weak

pull-down.

External Components

to the VDD pin as possible. No vias should be used

between the decoupling capacitors and VDD pins. The

PCB trace to VDD pins should be kept as short as

possible, as should the PCB trace to the ground via.

Decoupling Capacitor

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

ICS5OSK481 must be isolated from system power

supply noise to perform optimally.

2) To minimize EMI, the 33Ω series termination resistor

(if needed) should be placed close to the clock output.

A decoupling capacitor of 0.01µF must be connected

between each VDD and the PCB ground plane.

3) An optimum layout is one with all components on the

same side of the board, minimizing vias through other

signal layers. Other signal traces should be routed

away from the ICS5OSK481. This includes signal

traces just underneath the device, or on layers adjacent

to the ground plane layer used by the device.

Series Termination Resistor

Clock output traces over one inch should use series

termination. To series terminate a 50Ω trace (a

commonly used trace impedance), place a 33Ω resistor

in series with the clock line, as close to the clock output

pin as possible. The nominal impedance of the clock

output is 20Ω.

PCB Layout Recommendations

For optimum device performance and lowest output

phase noise, the following guidelines should be

observed.

1) The 0.01µF decoupling capacitors should be

mounted on the component side of the board as close

MDS 5OSK481 B

Revision 111805

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

P R E L I M I N A R Y I N F O R M AT I O N

ICS5OSK481

48 MHz Tiny USB Clock Source

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS5OSK481. 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

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.

+85

Units

°C

Ambient Operating Temperature

Power Supply Voltage (measured in respect to GND)

-40

+3.135

+3.465

DC Electrical Characteristics

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

Parameter

Symbol Conditions

Min.

3.135

Typ.

Max.

Units

Operating Voltage

VDD

3.465

(VDD/2)-1

0.8

Input High Voltage, ICLK only

Input Low Voltage, ICLK only

Input High Voltage

ICLK

(VDD/2)+1

2.0

2.4

Input Low Voltage

Output High Voltage

= -12 mA

= 12 mA

Output Low Voltage

0.4

IDD Operating Supply Current

Short Circuit Current

No load

CLK output

TBD

+70

270

kΩ

Ω

On-Chip Pull-up Resistor

Input Capacitance, S1, S0, and OE

Nominal Output Impedance

MDS 5OSK481 B

Revision 111805

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

P R E L I M I N A R Y I N F O R M AT I O N

ICS5OSK481

48 MHz Tiny USB Clock Source

AC Electrical Characteristics

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

Parameter

Input Frequency, clock input

Output Frequency, VDD = 3.3 V 5%

Output Clock Rise Time

Symbol

Conditions

Min. Typ. Max. Units

0.5

MHz

-40°C to +85°C

0.8 to 2.0 V, Note 1

2.0 to 8.0 V, Note 1

1.5 V

OUT

Output Clock Fall Time

Output Clock Duty Cycle

49-51

Output Enable Time, OE high to

output on

Output Disable Time, OE low to

tri-state

Absolute Clock Period Jitter

Deviation from

mean, Note 1

TBD

Note 1: Measured with 15 pF load.

MDS 5OSK481 B

Revision 111805

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

P R E L I M I N A R Y I N F O R M AT I O N

ICS5OSK481

48 MHz Tiny USB Clock Source

Package Outline and Package Dimensions (5-pin TSOT)

Package dimensions are kept current with JEDEC Publication No. 95

Millimeters

Symbol

Min

—

Max

1.00

0.10

0.90

0.45

0.20

0.01

0.84

0.30

0.12

2.90 BASIC

2.80 BASIC

1.60 BASIC

0.95 BASIC

1.90 BASIC

0.30

0.60 REF

0.25 BASIC

0.50

0°

8°

aaa

—

0.10

Ordering Information

Part / Order Number

ICS5OSK481TILF

Marking

TBD

Shipping Packaging

Tubes

Package

5-pin TSOT

Temperature

-40 to +85° C

ICS5OSK481TILFT

TBD

Tape and Reel

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.

MDS 5OSK481 B

Revision 111805

Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

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