ICS502
LOCOTM PLL Clock Multiplier
MDS 502 E
1
Revision 021402
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 9 5126 (408) 295-9800te l www.icst.com
Packaged as 8 pin SOIC or die
ICS' lowest cost PLL clock plus reference
Zero ppm multiplication error
Easy to cascade with other 5xx series
Input crystal frequency of 5 - 27 MHz
Input clock frequency of 2 - 50 MHz
Output clock frequencies up to 160 MHz
Low jitter - 50 ps one sigma
Compatible with all popular CPUs
Duty cycle of 45/55 up to 160 MHz
Operating voltages of 3.0 to 5.5V
Industrial temperature version available
25mA drive capability at TTL levels
Advanced, low power CMOS process
The ICS502 LOCOTM is the most cost effective way to
generate a high quality, high frequency clock output
and a reference from a low frequency crystal or clock
input. The name LOCO stands for LOw Cost Oscillator,
as it is designed to replace crystal oscillators in most
electronic systems. Using Phase-Locked-Loop (PLL)
techniques, the device uses a standard fundamental
mode, inexpensive crystal to produce output clocks up
to 160 MHz.
Stored in the chip's ROM is the ability to generate 6
different multiplication factors, allowing one chip to
output many common frequencies (see page 2).
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 ICS570B.
Block Diagram
Description
Features
CLK
Crystal
Oscillator
VDD
GND
PLL
Clock
Synthesis
and Control
Circuitry
Output
Buffer
crystal
or clock
REF
X2
X1/ICLK
Output
Buffer
S1, S0
2
ICS502
LOCOTM PLL Clock Multiplier
MDS 502 E
2
Revision 021402
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 9 5126 (408) 295-9800te l www.icst.com
Pin Assignment
1
8
2
3
4
7
6
5
X1/ICLK
VDD
GND
REF
X2
S1
S0
CLK
Number
Name
Type
Description
1
X1/ICLK
I
Crystal connection or clock input.
2
VDD
P
Connect to +3.3V or +5V.
3
GND
P
Connect to ground.
4
REF
O
Buffered crystal oscillator output clock.
5
CLK
O
Clock output per Table above.
6
S0
I
Select 0 for output clock. Connect to GND or VDD.
7
S1
TI
Select 1 for output clock. Connect to GND or VDD or float.
8
X2
O
Crystal connection. Leave unconnected for clock input.
Pin Descriptions
Key: I = Input, TI = Tri-Level Input, O = output, P = power supply connection
Clock Decoding Table (MHz)
S1
S0
CLK
0
0
x2
0
1
x5
M
0
x3
M
1
x3.33
1
0
x4
1
1
x2.5
Output
2 0
2 5
3 0
3 2
3 3 . 3 3
3 7 . 5
4 0
4 8
5 0
5 4
6 0
Input
10
10
10
16
10
15
20
16
20
13.5
20
Selection (S1, S0)
0, 0
1, 1
M, 0
0, 0
M, 1
1, 1
0, 0
M, 0
1, 1
1, 0
M, 0
Output
6 4
6 6 . 6 6
7 2
7 5
8 0
8 1
9 0
1 0 0
1 0 8
1 2 0
1 3 5
Input
16
20
24
15
20
27
27
20
27
24
27
Selection (S1, S0)
1, 0
M, 1
M, 0
0, 1
1, 0
M, 0
M, 1
0, 1
1, 0
0, 1
0, 1
Common Output Frequencies Examples (MHz)
0 = connect directly to ground.
1 = connect directly to VDD.
M = leave unconnected (floating).
Note that all of the above outputs are achieved by using an inexpensive 10MHz to 27MHz crystal.
Consult MicroClock/ICS on how to achieve other output frequencies.
Minimum input frequency for all
selections is per table on page 3.
ICS502
LOCOTM PLL Clock Multiplier
MDS 502 E
3
Revision 021402
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 9 5126 (408) 295-9800te l www.icst.com
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
ABSOLUTE MAXIMUM RATINGS (stresses beyond these can permanently damage the device)
Supply Voltage, VDD
Referenced to GND
7
V
Inputs
Referenced to GND
-0.5
VDD+0.5
V
Clock Output
Referenced to GND
-0.5
VDD+0.5
V
Ambient Operating Temperature
0
70
C
ICS502MI only
-40
85
C
Soldering Temperature
Max of 10 seconds
260
C
Storage temperature
-65
150
C
DC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
DC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
DC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
Operating Voltage, VDD
3
5.5
V
Input High Voltage, VIH, ICLK only
ICLK (Pin 1)
(VDD/2)+1
VDD/2
V
Input Low Voltage, VIL, ICLK only
ICLK (Pin 1)
VDD/2
(VDD/2)-1
V
Input High Voltage, VIH
S0
2
V
Input Low Voltage, VIL
S0
0.8
V
Input High Voltage, VIH
S1
VDD-0.5
V
Input Low Voltage, VIL
S1
0.5
V
Output High Voltage, VOH
IOH=-25mA
2.4
V
Output Low Voltage, VOL
IOL=25mA
0.4
V
IDD Operating Supply Current, 20 MHz crystal
No Load, 100MHz
20
mA
Short Circuit Current
CLK output
70
mA
On-Chip Pull-up Resistor
Pin 6
270
k
Input Capacitance, S1, S0
Pins 6, 7
4
pF
AC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
AC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
AC CHARACTERISTICS (VDD = 5.0V unless otherwise noted)
Input Frequency, crystal input
5
27
MHz
Input Frequency, clock input
2
50
MHz
Output Frequency, VDD = 4.5 to 5.5V
0 C to +70 C
14
160
MHz
-40 C to +85 C
14
140
MHz
Output Frequency, VDD = 3.0 to 3.6V
0 C to +70 C
14
100
MHz
-40 C to +85 C
14
90
MHz
Output Clock Rise Time
0.8 to 2.0V
1
ns
Output Clock Fall Time
2.0 to 0.8V
1
ns
Output Clock Duty Cycle
at VDD/2
45
49 to 51
55
%
Absolute Clock Period Jitter
Deviation from mean
120
ps
One Sigma Clock Period Jitter
50
ps
ICS502
LOCOTM PLL Clock Multiplier
MDS 502 E
4
Revision 021402
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA 9 5126 (408) 295-9800te l www.icst.com
While the information presented herein has been checked for both accuracy and reliability, 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.
Package Outline and Package Dimensions
Inches
Inches
Millimeters
Millimeters
Symbol
Min
Max
Min
Max
A
0.055
0.068
1.397 1.7272
b
0.013
0.019
0.330
0.483
D
0.185
0.200
4.699
5.080
E
0.150
0.160
3.810
4.064
H
0.225
0.245
5.715
6.223
e .050 BSC
.050 BSC 1.27 BSC
1.27 BSC
h
0.015
0.381
Q
0.004
0.01
0.102
0.254
8 pin SOIC
Ordering Information
External Components / Crystal Selection
The ICS502 requires a 0.01F decoupling capacitor to be connected between VDD and GND. It must be
connected close to the ICS502 to minimize lead inductance. No external power supply filtering is required for this
device. A 33
terminating resistor can be used next to the CLK pin. The total on-chip capacitance is approximately
13 pF, so a parallel resonant, fundamental mode crystal should be used. For crystals with a specified load
capacitance greater than 13 pF, crystal capacitors should be connected from each of the pins X1 and X2 to Ground
as shown in the Block Diagram on page 1. The value (in pF) of these crystal caps should be = (CL-13)*2, where CL
is the crystal load capacitance in pF. 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).
c
A
b
D
E
H
e
h x 45
Q
Pin 1
LOCO is a trademark of ICS
Part/Order Number
Marking
Package
Temperature
ICS502M
ICS502M
8 pin SOIC
0 to 70 C
ICS502MT
ICS502M
8 pin SOIC on tape and reel
0 to 70 C
ICS502MI
ICS502I
8 pin SOIC
-40 to +85 C
ICS502MIT
ICS502I
8 pin SOIC on tape and reel
-40 to +85 C
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