ICS551MLFT - Integrated Device Technology

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1 TO 4 CLOCK BUFFER ICS551

IDT™

1 TO 4 CLOCK BUFFER 1

ICS551 REV N 010610

Description

The ICS551 is a low cost, high-speed single input to

four output clock buffer. Part of IDT’s ClockBlocksTM

family, this is our lowest cost, small clock buffer.

See the ICS552-02B for monolithic dual version of the

ICS551 in a 20 pin QSOP.

IDT makes many non-PLL and PLL based low skew

output devices as well as Zero Delay Buffers to

synchronize clocks. Contact IDT for all of your clocking

needs.

Features

•Low skew (250 ps) outputs

•Pb-free packaging available

•Low cost clock buffer

•Packaged in 8-pin SOIC

•Input/Output clock frequency up to 160 MHz

•Non-inverting output clock

•Ideal for networking clocks

•Operating Voltages of 3.3 and 5.0 V

•Output Enable mode tri-states outputs

•Advanced, low power CMOS process

•Commercial and industrial temperature versions

NOTE: EOL for non-green parts to occur on

5/13/10 per PDN U-09-01

Block Diagram

ICLK

Output Enable

ICS551

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IDT™

1 TO 4 CLOCK BUFFER 2

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Pin Assignment

Pin Descriptions

External Components

A minimum number of external components are required for proper operation. A decoupling capacitor of

0.01 µF should be connected between VDD on pin 7 and GND on pin 6, as close to the device as possible.

A 33Ω series terminating resistor may be used on each clock output if the trace is longer than 1 inch.

ICLK

VDD

GND

8 Pin (150 mil) SOIC

Number

Name

Type

Pin Description

1 ICLK Input Clock input. Internal pull-up resistor.

2 Q1 Output Clock output 1.

3 Q2 Output Clock output 2.

4 Q3 Output Clock output 3.

5 Q4 Output Clock output 4.

6 GND Power Connect to ground.

7 VDD Power Connect to 3.3 V or 5.0 V.

8 OE Input Output Enable. Tri-states outputs when low. Internal pull-up resistor.

ICS551

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IDT™

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ICS551 REV N 010610

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS551. 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, Commercial 0 to +70°C

Ambient Operating Temperature, Industrial -40 to +85°C

Storage Temperature -65 to +150°C

Junction Temperature 125°C

Soldering Temperature 260°C

Parameter Min. Typ. Max. Units

Ambient Operating Temperature -40 – +85 °C

Power Supply Voltage (measured in respect to GND) +3.0 +5.5 V

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IDT™

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ICS551 REV N 010610

DC Electrical Characteristics

VDD=3.3 V ±10% , Ambient temperature -40 to +85 °C, unless stated otherwise

VDD = 5 V ±10% , Ambient temperature -40 to +85 °C, unless stated otherwise

Notes: 1. Nominal switching threshold is VDD/2.

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 3.0 3.6 V

Input High Voltage, ICLK VIH Note 1 VDD/2+0.7 3.8 V

Input Low Voltage, ICLK VIL Note 1 VDD/2-0.7 V

Input High Voltage, OE VIH 2VDDV

Input Low Voltage, OE VIL 0.8 V

Output High Voltage VOH IOH = -25 mA 2.4 V

Output Low Voltage VOL IOL = 25 mA 0.4 V

Output High Voltage (CMOS

Level)

VOH IOH = -12 mA VDD-0.4 V

Operating Supply Current IDD No load, 135 MHz 18 mA

Nominal Output Impedance ZO20 Ω

Internal Pull-up Resistor RPU OE 500 kΩ

Input Capacitance CIN OE pin 5 pF

Short Circuit Current IOS ±50 mA

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 4.5 5.5 V

Input High Voltage, ICLK VIH Note 1 VDD/2+1 5.5 V

Input Low Voltage, ICLK VIL Note 1 VDD/2-1 V

Input High Voltage, OE VIH 2VDDV

Input Low Voltage, OE VIL 0.8 V

Output High Voltage VOH IOH = -35 mA 2.4 V

Output Low Voltage VOL IOL = 35 mA 0.4 V

Output High Voltage (CMOS

Level)

VOH IOH = -12 mA VDD-0.4 V

Operating Supply Current IDD No load, 135 MHz 35 mA

Nominal Output Impedance ZO20 Ω

Internal Pull-up Resistor RPU OE 220 kΩ

Input Capacitance CIN OE pin 5 pF

Short Circuit Current IOS ±80 mA

ICS551

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IDT™

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AC Electrical Characteristics

VDD = 3.3 V ±10%, Ambient Temperature -40 to +85 °C, unless stated otherwise

VDD = 5 V ±10%, Ambient Temperature -40 to +85 °C, unless stated otherwise

Notes:

1. With rail to rail input clock.

2. Between any 2 outputs with equal loading.

3. Duty cycle on outputs will match incoming clock duty cycle. Consult IDT for tight duty cycle clock

generators.

4. With external series resistor of 33Ω positioned close to each output pin.

Parameter Symbol Conditions Min. Typ. Max. Units

Input Frequency 0 160 MHz

Output Frequency 15 pF load, Note 4 160 MHz

Output Clock Rise Time tOR 0.8 to 2.0 V 1.0 ns

Output Clock Fall Time tOF 2.0 to 0.8 V 1.0 ns

Propagation Delay Note 1 135 MHz 2 4 8 ns

Output to Output Skew Note 2 Rising edges at VDD/2 250 ps

Parameter Symbol Conditions Min. Typ. Max. Units

Input Frequency 0 135 MHz

Output Frequency 15 pF load, Note 4 135 MHz

Output Clock Rise Time tOR 0.8 to 2.0 V 1.0 ns

Output Clock Fall Time tOF 2.0 to 0.8 V 1.0 ns

Propagation Delay Note 1 135 MHz 1.5 3 6 ns

Output to Output Skew Note 2 Rising edges at VDD/2 250 ps

ICS551

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IDT™

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ICS551 REV N 010610

Marking Diagram (ICS551M)

Marking Diagram (ICS551MLF)

Marking Diagram (ICS551MLN)

Marking Diagram (ICS551MI)

Marking Diagram (ICS551MILF)

Notes:

1. ###### is the lot number.

2. YYWW is the last two digits of the year and week that

the part was assembled.

3. “LF” denotes Pb (lead) free package.

4. Bottom marking: (origin)

Origin = country of origin if not USA.

ICS551M

######

YYWW$$

551MLF

######

YYWW

551MLN

######

YYWW

ICS551MI

######

YYWW$$

551MILF

######

YYWW

ICS551

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IDT™

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Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)

Package dimensions are kept current with JEDEC Publication No. 95

INDEX

AREA

1 2

SEATING

PLANE

- C -

.10 (.004) C

h x 45

Millimeters Inches

Symbol Min Max Min Max

A 1.35 1.75 .0532 .0688

A1 0.10 0.25 .0040 .0098

B 0.33 0.51 .013 .020

C 0.19 0.25 .0075 .0098

D 4.80 5.00 .1890 .1968

E 3.80 4.00 .1497 .1574

e 1.27 BASIC 0.050 BASIC

H 5.80 6.20 .2284 .2440

h 0.25 0.50 .010 .020

L 0.40 1.27 .016 .050

α0°8°0°8°

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IDT™

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ICS551 REV N 010610

Ordering Information

*NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01

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

“LN” denotes parts that are Pb free and annealed.

While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT)

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 IDT. IDT reserves the right to change any

circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or

critical medical instruments.

Part / Order Number Marking Shipping Packaging Package Temperature

551M* ICS551M Tubes 8-pin SOIC 0 to +70 °C

551MT* ICS551M Tape and Reel 8-pin SOIC 0 to +70 °C

551MLF 551MLF Tubes 8-pin SOIC 0 to +70 °C

551MLFT 551MLF Tape and Reel 8-pin SOIC 0 to +70 °C

551MLN 551MLN Tubes 8-pin SOIC 0 to +70 °C

551MLNT 551MLN Tape and Reel 8-pin SOIC 0 to +70 °C

551MI* ICS551MI Tubes 8-pin SOIC -40 to +85 °C

551MIT* ICS551MI Tape and Reel 8-pin SOIC -40 to +85 °C

551MILF 551MILF Tubes 8-pin SOIC -40 to +85 °C

551MILFT 551MILF Tape and Reel 8-pin SOIC -40 to +85 °C

Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered

trademarks used to identify products or services of their respective owners.

Printed in USA

Corporate Headquarters

Integrated Device Technology, Inc.

www.idt.com

For Sales

800-345-7015

408-284-8200

Fax: 408-284-2775

For Tech Support

www.idt.com/go/clockhelp

Innovate with IDT and accelerate your future networks. Contact:

www.IDT.com

ICS551

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