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
X123
33.8688
86.4672
1
X616
42.83
C lock
X 1, X 2
(M Hz)
D ivisor
O utput
(M Hz)
20M
8.4672
X52112
20.0134
40M
8.4672
X5211
40.0268
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.
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
PA RA M ETER
SYM BOL
TEST CONDITIONS
M IN
TY P
M A X
UNITS
Input Low Voltage
V
IL
-
-
0.8
V
Input H igh Voltage
V
IH
2.0
-
-
V
Input Low Current
I
IL
V
IN
=0V
-18.0
-8.3
-
A
Input H igh Current
I
IH
V
IN
=V
DD
-
-
5.0
A
Output Low Voltage
V
OL
*
I
OL
=+10m A
-
0.15
0.4
V
Output H igh 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, O ne 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
*
X 1 (Pin 1), X2 (Pin 8)
-5
-
-
pF
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
-
A
Input High Current
I
IH
V
IN
=V
DD
-
-
5.0
A
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
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.
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