ICS525-04
MDS 525-04 B
1
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
OSCaR
TM
User Configurable PECL Clock
Description
The ICS525-04 OSCaR
TM
is the most flexible way to
generate a high quality, high frequency differential
PECL clock output from a crystal or CMOS clock input.
The name OSCaR
TM
stands for Oscillator
Replacement, as it is designed to replace crystal
oscillators in almost any electronic system. Users can
easily configure the device to produce nearly any
output frequency from any input frequency by
grounding or floating the select pins. Neither
microcontroller, software, nor device programmer are
needed to set the frequency. Using Phase Locked Loop
techniques, the device accepts a crystal or clock to
produce output clocks up to 156 MHz at 3.3V, keeping
them frequency locked together.
For simple multipliers to produce common frequencies,
refer to the LOCO
TM
family of parts, which are smaller
and more cost effective.
This product is intended for clock generation. It has low
output jitter (variation in the output period), but input to
output skew and jitter are not defined nor guaranteed.
For applications which require defined input to output
timing, use the ICS527-02.
Features
Packaged as 28 pin SSOP (150 mil body)
Highly accurate frequency generation
User determines the output frequency by setting all
internal dividers
Eliminates need for custom oscillators
No software needed
Pull-ups on select inputs
Input crystal frequency of 5 - 27 MHz
Input clock frequency of 2 - 50 MHz
Output clock frequencies up to 156 MHz at 3.3V
Output clock frequencies up to 200 MHz at 5V
Very low jitter
PECL levels set by external resistors
Operating voltage of 3.3V or 5V
Ideal for oscillator replacement
Industrial temperature version available
Advanced, low power CMOS process
Block Diagram
VDD
GND
2
2
PECL
PECL
Reference
Divider
Phase Comparator,
Charge Pump, and
Loop Filter
VCO
VCO
Divider
Output
Divider
9
7
3
R6:R0
V8:V0
S2:S0
RES
VDD
VDD
GND
GND
VDD
X1/ICLK
X2
Crystal or
clock input
Optional crystal capacitors
Crystal
Oscillator
560
82
820
82
820
OSCaR
TM
User Configurable PECL Clock
MDS 525-04 B
2
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
ICS525-04
Pin Assignment
Maximum Output Frequency and Output Divider Table
18
7
17
8
16
9
15
X1/ICLK
10
X2
11
GND
12
PECL
13
V0
14
V1
GND
RES
V8
V2
V7
V5
V3
V6
22
21
20
19
V4
PECL
5
6
S2
VDD
VDD
24
23
R0
3
4
S0
S1
R1
26
25
R2
1
2
R5
R6
R3
28
27
R4
28 pin 150 mil body SSOP
S2
Pin 5
S1
Pin 4
S0
Pin 3
CLK Output
Divider
Max Output Frequency (MHz)
VDD = 5V
VDD = 3.3V
0 - 70
C
-40 - 85
C
0 - 70
C
-40 - 85
C
0
0
0
6
45
44
27
26
0
0
1
2
120
117
81
77
0
1
0
8
34
33
20
19
0
1
1
4
68
66
40
38
1
0
0
5
54
53
32
31
1
0
1
7
39
38
23
22
1
1
0
1
200
195
162
154
1
1
1
3
90
89
54
51
OSCaR
TM
User Configurable PECL Clock
MDS 525-04 B
3
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
ICS525-04
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
Pin Description
1
R5
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
2
R6
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
3
S0
Input
Select pins for output divider determined by user. See table above. Internal pull-up.
4
S1
Input
Select pins for output divider determined by user. See table above. Internal pull-up.
5
S2
Input
Select pins for output divider determined by user. See table above. Internal pull-up.
6
VDD
Power
Connect to VDD.
7
X1/ICLK
Input
Crystal connection. Connect to a parallel resonant crystal or input clock.
8
X2
Input
Crystal connection. Connect to a crystal or leave unconnected for clock.
9
GND
Power
Connect to ground.
10 - 18
V0 - V8
Input
VCO divider word input pins determined by user. Forms a binary number from 0 to 511.
Internal pull-up.
19
RES
Input
Bias resistor input. Connect a resistor between this pin and VDD.
20
GND
Power
Connect to ground.
21
PECL
Output
Complementary PECL output. Connect resistor load to this pin.
22
PECL
Output
PECL output. Connect resistor load to this pin.
23
VDD
Power
Connect to VDD.
24
R0
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
25
R1
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
26
R2
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
27
R3
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
28
R4
Input
Reference divider word input pins determined by user. Forms a binary number from 0
to 127. Internal pull-up.
OSCaR
TM
User Configurable PECL Clock
MDS 525-04 B
4
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
ICS525-04
External Components
Decoupling Capacitors
As with any high performance mixed-signal IC, the
ICS525-04 must be isolated from system power supply
noise to perform optimally.
Decoupling capacitors of 0.01F must be connected
between each VDD and the GND, one on each side of
the chip.The capacitor must be connected close to the
device to minimize lead inductance. No external power
supply filtering is required for this device.
External Resistors
A 560
resistor must be connected between RES (pin
19) and VDD. A total of four resistors are needed for
the PECL outputs as shown on the block diagram on
page 1. The value of these resistors are shown, but can
be varied to change the differential pair output swing
and the common mode voltage. Consult application
note MAN09 for more information.
Crystal Load Capacitors
The total on-chip capacitance for a crystal is
approximately 16 pF, so a parallel resonant,
fundamental mode crystal with this value of load
(correlation) capacitance should be used. For crystals
with a specified load capacitance greater than 16 pF,
crystal capacitors may be connected from each of the
pins X1 and X2 to Ground as shown in the block
diagram. The value (in pF) of these crystal caps should
be (CL - 16)*2, where CL is the crystal load
capacitance. These external capacitors are only
required for applications where the exact frequency is
critical. For a clock input, connect to X1 and leave X2
unconnected (no capacitors on either).
Determining the Output Frequency
Users have full control in setting the desired output
frequency over the range shown in the table on page 2.
To replace a standard oscillator, users should connect
the divider select input pins directly to ground (or VDD,
although this is not required because of internal
pull-ups) during Printed Circuit Board layout. The
ICS525-04 will automatically produce the correct clock
when all components are soldered. It is also possible to
connect the inputs to parallel I/O ports to switch
frequencies. By choosing divides carefully, the number
of inputs which need to be changed can be minimized.
Observe the restrictions on allowed values of VDW and
RDW.
The output of the ICS525-04 can be determined by the
following simple equation:
Where:
Reference Divider Word (RDW) = 0 to 127
VCO Divider Word (VDW) = 0 to 511
Output Divider (OD) = values on page 2
Also, the following operating ranges should be
observed:
See table on page 2 for full details of maximum
output.
The dividers are expressed as integers. For example, if
a 66.66 MHz output on CLK1 is desired from a
14.31818 MHz input, the VCO divider word (VDW)
should be 276, with an output divide (OD) of 2. In this
example, R6:R0 is 0111011, V8:V0 is 100010100 and
S2:S0 is 001. Since all of these inputs have pull-up
resistors, it is only necessary to ground the zero pins,
namely V7, V6, V5, V3, V1, V0, R6, R2, S2, and S1.
To determine the best combination of VCO, reference,
and output divide, use the ICS525 Calculator on our
web site: www.icst.com. The online form is easy to use
and quickly shows you up to three options for these
settings. Alternately, you may send an e-mail to
ics-mk@icst.com.
PECL Frequency
Input Frequency
VDW
8
+
RDW
2
+
(
)
OD
---------------------------------------------
=
10M
Input Frequency
VDW
8
+
RDW
2
+
(
)
-----------------------------
200M 5V
(
)
or162M 3.3v
)
(
)
<
<
200kHz
InputFrequency
RDW
2
+
(
)
-----------------------------------------------
<
OSCaR
TM
User Configurable PECL Clock
MDS 525-04 B
5
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
ICS525-04
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS525-04. 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
Unless stated otherwise, VDD = 3.3V 10%, Ambient Temperature 0 to +70
C
Item
Rating
Supply Voltage, VDD
7V
All Inputs and Outputs
-0.5V to VDD+0.5V
Ambient Operating Temperature
-40 to +85
C
Storage Temperature
-65 to +150
C
Junction Temperature
175
C
Soldering Temperature
260
C
Parameter
Min.
Typ.
Max.
Units
Ambient Operating Temperature, ICS525R-04
0
+70
C
Ambient Operating Temperature, ICS525R-04I
-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
3.0
5.5
V
Supply Current
IDD
15 MHz in, 60MHz out,
no load
34
mA
15MHz in, 60MHz out,
VDD = 5V
60
mA
Input High Voltage
V
IH
2
V
Input Low Voltage
V
IL
0.8
V
Input High Voltage
V
IH
X1/ICLK only
VDD/2+1
VDD/2
V
Input Low Voltage
V
IL
X1/ICLK only
VDD/2
VDD/2-1
V
Output High Voltage
V
OH
I
OH
= -12 mA
2.4
V
OSCaR
TM
User Configurable PECL Clock
MDS 525-04 B
6
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
ICS525-04
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3V 5%, Ambient Temperature -40 to +85
C
Output Low Voltage
V
OL
I
OL
= 12 mA
0.4
V
Input Capacitance
C
IN
V, R, S select pins
5
pF
On-chip pull-up resistor
R
PU
V, R, S select pins
270
k
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Input Frequency
F
IN
Crystal input
5
27
MHz
Clock input
2
50
MHz
Output Frequency with OD=2,
VDD=4.5 to 5
F
OUT
0 to +70
C
1
120
MHz
-40 to +85
C
1
117
MHz
Output Frequency with OD=2,
VDD=3.0 to 3.3
F
OUT
0 to +70
C
1
81
MHz
-40 to +85
C
1
77
MHz
Absolute Clock Period Jitter
t
ja
Deviation from mean
50
ps
One sigma Clock Period Jitter
t
js
20
ps
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
OSCaR
TM
User Configurable PECL Clock
MDS 525-04 B
7
Revision 091802
Integrated Circuit Systems, Inc.
q
525 Race Street, San Jose, CA 95126
q
tel (408) 295-9800
q
www.icst.com
ICS525-04
Package Outline and Package Dimensions
(28 pin SSOP, 150 mil Body, 0.025 mm Pitch)
Package dimensions are kept current with JEDEC Publication No. 95, MO-153
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
ICS525R-04
ICS525R-04
Tubes
28 pin SSOP
0 to +70
C
ICS525R-04T
ICS525R-04
Tape and Reel
28 pin SSOP
0 to +70
C
ICS525R-04I
ICS525R-04I
Tubes
28 pin SSOP
-40 to +85
C
ICS525R-04IT
ICS525R-04I
Tape and Reel
28 pin SSOP
-40 to +85
C
INDEX
AREA
1 2
28
D
E1
E
SEATING
PLANE
A
1
A
A
2
e
- C -
b
aaa
C
c
L
Millimeters
Inches
Symbol
Min
Max
Min
Max
A
1.35
1.75
.053
.069
A1
0.10
0.25
.0040
.010
A2
--
1.50
--
.059
b
0.20
0.30
.008
.012
C
0.18
0.25
.007
.010
D
9.80
10.00
.386
.394
E
5.80
6.20
.228
.244
E1
3.80
4.00
.150
.157
e
0.635 Basic
0.025 Basic
L
0.40
1.27
.016
.050
0
8
0
8
aaa
--
0.10
--
0.004
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