ICS601R-25I Datasheet ICS601R-25, ICS601R-25I, ICS601R-25IT | P1-P3

DATASHEET

LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER ICS601-25

IDT™ / ICS™

LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER 1

ICS601-25 REV D 102709

Description

The ICS601-25 is a low-cost, low phase noise, high

performance clock synthesizer for applications which

require low phase noise, low jitter, and low skew fanout. It is

IDT’s lowest phase noise multiplier, and also the lowest

CMOS part in the industry. Using IDT’s patented analong

and digital Phase Locked Loop (PLL) techniques, the chip

accepts a 10-27 MHz crystal or clock input, and produces

output clocks up to 156 MHz.

Features

• Packaged in 20-pin SSOP

• Uses fundamental 10 - 27 MHz crystal or clock

• Output clocks up to 156 MHz

• Low phase noise: -132 dBc/Hz at 10 kHz

• Five low skew (<250 ps) outputs

• Low jitter - 18 ps one sigma at 125 MHz

• Full swing CMOS outputs with 25 mA drive capability at

TTL levels

• Powerdown mode lowers power consumption

• Advanced, low power, sub-micron CMOS process

• Industrial temperature version available

• Available in Pb (lead) free package

• Operating voltage of 3.3 V

NOTE: EOL for non-green parts to occur on

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

Block Diagram

CLK1

ROM Based

Multipliers

VCO

Divide

X1/ICLK

Crystal or

clock input

Crystal

Oscillator

Reference

Divider

Phase

Comparator

VDD

Charge

Pump

Loop

Filter

VCO

S3:0

CLK5

CLK4

CLK3

CLK2

GND

ICS601-25

LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER CLOCK MULTIPLIER

IDT™ / ICS™

LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER 2

ICS601-25 REV D 102709

Pin Assignment Output Select Table

Pin Descriptions

GND

CLK3

GND

VDDPD

CLK1

VDD

CLK5

CLK4

20 Pin (150 mil) SSOP

VDD CLK2

VDD

GND

X1/ICLK

S3 S2 S1 S0 Multiplier

0000 x1

0001 x2

0010 x3

0011 x4

0100 x5

0101 x6

0110 x8

0 1 1 1 x16

1000 x7

1001 x9

1 0 1 0 x10

1 0 1 1 x11

1 1 0 0 x12

1 1 0 1 output tristates

1 1 1 0 x14

1 1 1 1 x15

Number

Name

Type

Pin Description

1 X1/ICLK XI Crystal or clock input. Connect to a 10-27 MHz fundamental parallel mode

crystal or clock input.

2 VDD Power Connect to +3.3 V.

3 S0 Input Select pin 0. Internal pull-up.

4, 5 VDD Power Connect to +3.3 V.

6 S1 Input Select pin 1. Internal pull-up.

7 GND Power Connect to ground.

8 S3 Input Select pin 3. Internal pull-down.

9PD

Input Powerdown when held low. Internal pull-up.

10 S2 Input Select pin 2. Internal pull-up.

11 CLK1 Output Clock output.

12 VDD Power Connect to +3.3 V.

13 CLK5 Output Clock output.

14 CLK4 Output Clock output.

15 GND Power Connect to ground.

16 CLK3 Output Clock output.

17 CLK2 Output Clock output.

18 VDD Power Connect to +3.3 V.

19 GND Power Connect to ground.

20 X2 XO Crystal connection. Connect to a 10-27 MHz fundamental parallel mode

crystal or leave unconnected for clock input.

ICS601-25

LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER CLOCK MULTIPLIER

IDT™ / ICS™

LOW PHASE NOISE 1 TO 5 CLOCK MULTIPLIER 3

ICS601-25 REV D 102709

External Components

The ICS601-25 requires a minimum number of external components for proper operation. Decoupling capacitors of

0.01 µF and 0.1 µF should be connected between VDD and GND, as close to the part as possible. A 33Ω series

terminating resistor should be used on each clock output. The crystal must be connected as close to the chip as

possible. The crystal should be fundamental mode, parallel resonant. Do not use third overtone. For exact tuning

when using a crystal, capacitors should be connected from pins X1 to ground and X2 to ground. In general, the

value of these capacitors is given by the following equation, where CL is the crystal load capacitance: Crystal caps

(pF) = (CL-5) x 2. So for a crystal with 16 pF load capacitance, two 22 pF caps can be used. For any given board

layout, ICS can measure the board capacitance and recommend the exact capacitance value to use.

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the ICS601-25. 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

DC Electrical Characteristics

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

Item Rating

Supply Voltage, VDD 7 V

All Inputs and Outputs -0.5 V to VDD+0.5 V

Ambient Operating Temperature, Commercial version 0 to +70 ° C

Ambient Operating Temperature, Industrial version -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 (commercial) 0 +70 ° C

Ambient Operating Temperature (industrial) -40 +85 ° C

Power Supply Voltage (measured in respect to GND) +2.97 +3.63 V

Parameter Symbol Conditions Min. Typ. Max. Units

Operating Voltage VDD 2.97 3.63 V

Input High Voltage V

X1/ICLK pin only VDD/2+1 V

Input Low Voltage V

X1/ICLK pin only VDD/2-1 V

P1-P3 P4-P6

ICS601R-25I

Mfr. #:

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Description:

IC CLOCK MULTIPLIER 1:5 20-SSOP

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ICS601R-25I

ICS601R-25I

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