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Integrated

Circuit

Systems, Inc.

Features

General Description

ICS9120-52

Frequency Generator for CD-ROM Systems

9120-52 Rev B 052497P

Block Diagram

Generates 33.8688 MHz or 42.83 MHz decode clocks

plus the 20 and 40 MHz fixed clocks

Single 8.4672 MHz crystal or system clock reference

200ps one sigma jitter maintains 16-bit performance

Output rise/fall times less than 2.0ns

On-chip loop filter components

3.3V-5V supply range

8-pin, 150-mil SOIC

Applications

Specifically designed to support the high performance

requirements of CD-ROM drive systems

The  ICS9120-52 is a high performance frequency generator

designed to support digital compact disk drive systems. It

offers all clock frequencies required for the servo and

decoder sections of these devices. These frequencies are

synthesized from a single 16.9344 MHz on-chip oscillator.

High accuracy, low jitter PLLs meet the 150 ppm frequency

tolerance required by these systems. Fast output clock

edge rates minimize board induced jitter.

Unlike competitive devices, the  ICS9120-52 operates over

the entire 3.0-5.5V range.

ICS reserves the right to make changes in the device data identified in this publication

without further notice. ICS advises its customers to obtain the latest version of all

device data to verify that any information being relied upon by the customer is current

and accurate.

Pin Configuration

8-Pin SOIC

Functionality

X 1,  X 2

(M Hz)

FS

D ivisor

C LK 1

8.4672

0

X12÷3

33.8688

86.4672

1

X61÷6

42.83

C lock

X 1,  X 2

(M Hz)

D ivisor

O utput

(M Hz)

20M

8.4672

X52÷11÷2

20.0134

40M

8.4672

X52÷11

40.0268

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2

ICS9120-52

Pin Descriptions

PIN

NUMBER

PIN

NAME

TYPE

DESCRIPTION

1

X1

Input

Crystal or external clock source. Has feedback bias for crystal.

2

VDD

Power

+Power supply input.

3

GND

Power

Ground return for Pin 2.

4

20M

Output

20 MHz fixed output clock.

5

CLK1

Output

33.8/42.83 MHz selectable clock output.

6

40M

Output

40 MHz fixedoutput clock.

7

FS

Input

Input selector for CLK1.

8

X2

Output

Crystal output drive.

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3

ICS9120-52

Absolute Maximum Ratings

Electrical Characteristics at 5 V

V

DD

 = +4.5 to +5.5 V, T

A 

= 0 to 70

o

C unless otherwise stated

*Parameter is guaranteed by design and characterization. Not 100% tested in production.

AVDD, VDD referenced to GND ........................................................................... 7V

Operating temperature under bias ...................................................... 0

o

C to +70

o

C

Storage temperature ....................................................................... -65

o

C to +150

o

C

Voltage on I/O pins referenced to GND ......................... GND -0.5V to VDD +0.5V

Power dissipation ...................................................................................... 0.5 Watts

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device.  This is a stress

rating only and 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 may affect

product reliability.

DC Characteristics

PARAM ETER

SYM BOL

TEST CONDITIONS

M IN

TYP

M A X

U NITS

Input Low Voltage

V

IL

-

-

0.8

V

Input High Voltage

V

IH

2.0

-

-

V

Input Low Current

I

IL

V

IN

=0V

-18.0

-8.3

-

µ A

Input High Current

I

IH

V

IN

=V

DD

-

-

5.0

µ A

Output Low Voltage

V

OL

*

I

OL

=+10m A

-

0.15

0.4

V

Output High Voltage

V

OH

*

I

OH

=-30m A

2.4

3.7

-

V

Output Low Current

I

OL

*

V

OL

=0.8V

25.0

45.0

-

m A

Output High Current

I

OH

*

V

OH

=2.4V

-

-53.0

-35.0

m A

Supply Current

I

DD

Unloaded

-

26.0

50.0

m A

Pull-up Resistor Value

R

PU

*

-

400.0

800.0

k ohm

AC Characteristics

Rise Tim e

T

r

*

15pF load, 0.8 to 2.0V

-

0.9

2.0

ns

Fall Tim e

T

f

*

15pF load, 2.0 to 0.8V

-

0.7

1.5

ns

Rise Tim e

T

r

*

15pF load, 20%  to 80%

-

1.8

3.25

ns

Fall Tim e

T

f

*

15pF load, 80%  to 20%

-

1.4

2.5

ns

Duty Cycle

D

t

*

15pF load @

50%  of V

DD

45.0

50.0

55.0

%

Jitter, One Sigm a

T

j1s

*

For all frequencies

-

100.0

200.0

ps

Jitter, Absolute

T

jab

*

For all frequencies

-500.0

300.0

500.0

ps

Input Frequency Range

F

i

*

8.0

8.4

100.0

M H z

Output Frequency Range

F

o

*

11.0

-

42.0

M H z

Output M ean Frequency

A ccuracy vs. Target

F

oa

*

With 8.4672 M Hz input

-0.125

-

-0.04

%

Power-up Tim e

T

pu

*

0 to 33.8 M Hz

-

5.5

12.0

m s

Crystal Input Capacitance

C

inx

*

X1 (Pin 1), X2 (Pin 8)

-5

-

-

pF

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4

ICS9120-52

Electrical Characteristics at 3.3 V

V

DD

 =  +3.0 to +3.7 V, T

A 

= 0

O

C-70

o

C unless otherwise stated

*Parameter is guaranteed by design and characterization. Not 100% tested in production.

DC Characteristics

PARAMETER

 SYMBOL

TEST CONDITIONS

 MIN

 TYP

 MAX

 UNITS

Input Low  Voltage

V

IL

 -

 -

 0.2V

DD

V

Input High Voltage

V

IH

0.7V

DD

 

-

 

-

 

V

Input Low Current

 I

IL

V

IN

=0V

-8.0

-3.6

 -

µA

Input High Current

I

IH

V

IN

=V

DD

-

-

5.0

µA

Output Low Voltage

V

OL

*

I

OL

=6.0mA

-

0.05V

DD

0.1

V

Output High Voltage

V

OH

*

I

OH

=4.0mA

0.85V

DD

0.94V

DD

-

V

Output Low Current

I

OL

*

V

OL

=0.2V

DD

15.0

24.0

-

mA

Output High Current

I

OH

*

V

OH

=0.7V

DD

-

-13.0

-8.0

mA

Supply Current

I

DD

Unloaded

-

17.0

40.0

mA

Pull-up Resistor Value

R

PU

*

-

620.0

900.0

k ohm

AC Characteristics

Rise Time

T

r

*

15pF load 0.8 to 2.0V

-

1.5

4.0

ns

Fall Time

T

f

*

15pF load 2.0 to 0.8V

-

1.0

3.0

ns

Rise Time

T

r

*

15pF load 20% to 80%

-

2.2

4.0

ns

Fall Time

T

f

*

15pF load 80% to 20%

-

1.5

3.0

ns

Duty Cycle

D

t

*

15pF load @ 50% of

V

DD

; Except REFCLK

45.0

50.0

 55.0

 %

Jitter, One Sigma

T

j1s

*

For all frequencies

except REFCLK

-

150.0

200

ps

Jitter Absolute

T

jab

*

For all frequencies

except REFCLK

-550.0

330.0

550.0

ps

Input Frequency Range

F

i

*

8.0

8.4

10.0

MHz

Output Frequency Range

F

o

*

11.0

-

38.0

MHz

Output Mean Frequency

Accuracy vs. Target

F

oa

*

With 8.4672 MHz input

-0.125

-

-0.04

%

Power-up Time

T

pu

*

0 to 33.8 M Hz

-

5.5

12.0

ms

Crystal Input Capacitance

C

inx

*

X1 (Pin 1),

X2 (Pin 8)

-

5

-

pF

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5

ICS9120-52

Ordering Information

ICS9120M-52

0.194

0.031

0.024

0.016

0.050

0.006 

± 0.004

0.238

0.154

0.015

0.063

0.025

0.008

8-Pin SOIC Package

Example:

ICS XXXX M-PPP

Package Type

   

M =SOIC

Device Type (consists of 3 or 4-digit numbers)

Prefix

   ICS, AV=Standard Device

Pattern Number (2 or 3-digit number for parts with ROM code pattern)

ICS reserves the right to make changes in the device data identified in this publication

without further notice. ICS advises its customers to obtain the latest version of all

device data to verify that any information being relied upon by the customer is current

and accurate.