ICS ICS525R-04T

ICS525-04
OSCaRTM User Configurable PECL Clock
Description
Features
The ICS525-04 OSCaRTM 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 OSCaRTM 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.
• Packaged as 28 pin SSOP (150 mil body)
• Highly accurate frequency generation
• User determines the output frequency by setting all
For simple multipliers to produce common frequencies,
refer to the LOCOTM 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.
•
•
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•
•
•
•
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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
2
VDD
Block Diagram
560Ω
VDD
82Ω
X1/ICLK
Crystal or
clock input
VDD
RES
Reference
Divider
Crystal
Oscillator
PECL
Phase Comparator,
Charge Pump, and
Loop Filter
VCO
820Ω
Output
Divider
X2
GND
VDD
82Ω
VCO
Divider
Optional crystal capacitors
PECL
820Ω
7
R6:R0
2
GND
3
S2:S0
GND
1
MDS 525-04 B
Integrated Circuit Systems, Inc.
9
V8:V0
●
525 Race Street, San Jose, CA 95126
Revision 091802
●
tel (408) 295-9800
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www.icst.com
ICS525-04
OSCaRTM User Configurable PECL Clock
Pin Assignment
R5
1
28
R6
2
27
R3
S0
3
26
R2
R4
S1
4
25
R1
S2
5
24
R0
VDD
6
23
VDD
X1/ICLK
7
22
PECL
X2
8
21
PECL
GND
9
20
GND
V0
10
19
RES
V1
11
18
V8
V2
12
17
V7
V3
13
16
V6
V4
14
15
V5
28 pin 150 mil body SSOP
Maximum Output Frequency and Output Divider Table
S2
S1
S0 CLK Output
Pin 5 Pin 4 Pin 3
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
2
MDS 525-04 B
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 091802
●
tel (408) 295-9800
●
www.icst.com
ICS525-04
OSCaRTM User Configurable PECL Clock
Pin Descriptions
Pin
Number
Pin
Name
Pin
Type
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.
Pin Description
3
MDS 525-04 B
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 091802
●
tel (408) 295-9800
●
www.icst.com
ICS525-04
OSCaRTM User Configurable PECL Clock
External Components
Observe the restrictions on allowed values of VDW and
RDW.
Decoupling Capacitors
The output of the ICS525-04 can be determined by the
following simple equation:
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 0.01µF 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 560Ω 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.
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:
VDW + 8
10M < Input Frequency x ----------------------------- < 200M ( 5V )or162M ( 3.3v ) )
( RDW + 2 )
InputFrequency
200kHz < ----------------------------------------------( RDW + 2 )
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.
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
[email protected]
4
MDS 525-04 B
Integrated Circuit Systems, Inc.
VDW + 8
PECL Frequency = Input Frequency × --------------------------------------------( RDW + 2 ) • OD
●
525 Race Street, San Jose, CA 95126
Revision 091802
●
tel (408) 295-9800
●
www.icst.com
ICS525-04
OSCaRTM User Configurable PECL Clock
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.
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
Recommended Operation Conditions
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
DC Electrical Characteristics
Unless stated otherwise, VDD = 3.3V ±10%, Ambient Temperature 0 to +70°C
Parameter
Symbol
Operating Voltage
VDD
Supply Current
IDD
Conditions
Typ.
Max.
Units
5.5
V
3.0
15 MHz in, 60MHz out,
no load
34
mA
15MHz in, 60MHz out,
VDD = 5V
60
mA
Input High Voltage
VIH
Input Low Voltage
VIL
Input High Voltage
VIH
X1/ICLK only
Input Low Voltage
VIL
X1/ICLK only
Output High Voltage
VOH
IOH = -12 mA
2
V
0.8
VDD/2+1
VDD/2
VDD/2
●
525 Race Street, San Jose, CA 95126
V
V
VDD/2-1
2.4
V
V
5
MDS 525-04 B
Integrated Circuit Systems, Inc.
Min.
Revision 091802
●
tel (408) 295-9800
●
www.icst.com
ICS525-04
OSCaRTM User Configurable PECL Clock
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
0.4
V
Output Low Voltage
VOL
IOL = 12 mA
Input Capacitance
CIN
V, R, S select pins
5
pF
On-chip pull-up resistor
RPU
V, R, S select pins
270
kΩ
AC Electrical Characteristics
Unless stated otherwise, VDD = 3.3V ±5%, Ambient Temperature -40 to +85° C
Parameter
Symbol
Input Frequency
FIN
Output Frequency with OD=2,
VDD=4.5 to 5
FOUT
Output Frequency with OD=2,
VDD=3.0 to 3.3
FOUT
Absolute Clock Period Jitter
tja
One sigma Clock Period Jitter
tjs
Min.
Typ.
●
Max.
Units
Crystal input
5
27
MHz
Clock input
2
50
MHz
0 to +70°C
1
120
MHz
-40 to +85°C
1
117
MHz
0 to +70°C
1
81
MHz
-40 to +85°C
1
77
MHz
Deviation from mean
± 50
ps
20
ps
6
MDS 525-04 B
Integrated Circuit Systems, Inc.
Conditions
525 Race Street, San Jose, CA 95126
Revision 091802
●
tel (408) 295-9800
●
www.icst.com
ICS525-04
OSCaRTM User Configurable PECL Clock
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
Millimeters
28
Symbol
E1
E
INDEX
AREA
1 2
D
A
2
Min
A
A1
A2
b
C
D
E
E1
e
L
α
aaa
Inches
Max
Min
1.35
1.75
0.10
0.25
-1.50
0.20
0.30
0.18
0.25
9.80
10.00
5.80
6.20
3.80
4.00
0.635 Basic
0.40
1.27
0°
8°
-0.10
Max
.053
.069
.0040
.010
-.059
.008
.012
.007
.010
.386
.394
.228
.244
.150
.157
0.025 Basic
.016
.050
0°
8°
-0.004
A
A
1
c
-Ce
SEATING
PLANE
b
L
aaa C
Ordering Information
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
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
7
MDS 525-04 B
Integrated Circuit Systems, Inc.
●
525 Race Street, San Jose, CA 95126
Revision 091802
●
tel (408) 295-9800
●
www.icst.com