ICS551MLFT - Integrated Circuit Systems, Inc.

ICS551

MDS 551 G 1Revision 091004

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

1 TO 4 CLOCK BUFFER

Description

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

four output clock buffer. Part of ICS’ 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.

ICS makes many non-PLL and PLL based low skew

output devices as well as Zero Delay Buffers to

synchronize clocks. Contact ICS 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 3.0 to 5 V

•Output Enable mode tri-states outputs

•Advanced, low power CMOS process

•Commercial and industrial temperature versions

Block Diagram

ICLK

Output Enable

1 TO 4 CLOCK BUFFER

MDS 551 G 2Revision 091004

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

ICS551

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 5.5 V.

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

1 TO 4 CLOCK BUFFER

MDS 551 G 3Revision 091004

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

ICS551

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS551. 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.

Recommended Operation Conditions

DC Electrical Characteristics

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

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

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 3.15 3.45 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 ICLK TBD kΩ

1 TO 4 CLOCK BUFFER

MDS 551 G 4Revision 091004

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

ICS551

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

Notes: 1. Nominal switching threshold is VDD/2

AC Electrical Characteristics

VDD = 3.3 V ±5%, 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 ICS for tight duty cycle clock

generators.

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

Input Capacitance CIN OE pin 5 pF

CIN ICLK TBD pF

Short Circuit Current IOS ±50 mA

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 4.75 5.25 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 ICLK TBD kΩ

Input Capacitance CIN OE pin 5 pF

CIN ICLK TBD pF

Short Circuit Current IOS ±80 mA

Parameter Symbol Conditions Min. Typ. Max. Units

Input Frequency 0 160 MHz

Output Frequency, 3.3 V 15 pF load. Note 4 160 MHz

Output Frequency, 5 V 15 pF load. Note 4 135 MHz

Output Clock Rise Time tOR 0.8 to 2.0 V 1.5 ns

Output Clock Fall Time tOF 2.0 to 0.8 V 1.5 ns

Propagation Delay, 3.3 V Note 1 135 MHz 2 4 8 ns

Propagation Delay, 5 V Note 1 135 MHz 1.5 3 6 ns

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

Parameter Symbol Conditions Min. Typ. Max. Units

1 TO 4 CLOCK BUFFER

MDS 551 G 5Revision 091004

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

ICS551

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°

1 TO 4 CLOCK BUFFER

MDS 551 G 6Revision 091004

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

ICS551

Ordering Information

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.

Part / Order Number Marking Shipping

packaging

Package Temperature

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

ICS551MT ICS551M Tape and Reel 8-pin SOIC 0 to +70 °C

ICS551MLF 551MLF Tubes 8-pin SOIC 0 to +70 °C

ICS551MLFT 551MLF Tape and Reel 8-pin SOIC 0 to +70 °C

ICS551MLN 551MLN Tubes 8-pin SOIC 0 to +70 °C

ICS551MLNT 551MLN Tape and Reel 8-pin SOIC 0 to +70 °C

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

ICS551MIT ICS551MI Tape and Reel 8-pin SOIC -40 to +85 °C

ICS551MILF 551MILF Tubes 8-pin SOIC -40 to +85 °C

ICS551MILFT 551MILF Tape and Reel 8-pin SOIC -40 to +85 °C