ICS512
LOCOTM PLL Clock Multiplier
MDS 512 C
1
Revision 061900
Printed 11/13/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126(408) 295-9800tel www.icst.com
Packaged as 8 pin SOIC or die
Upgrade of popular ICS502 with:
- changed multiplier table
- higher operating frequencies
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 200 MHz
Compatible with all popular CPUs
Duty cycle of 45/55 up to 200 MHz
Mask option for 9 selectable frequencies
Operating voltages of 3.0 to 5.5V
Industrial temperature version available
Advanced, low power CMOS process
The ICS512 LOCOTM is the most cost effective
way to generate a high quality, high frequency
clock output and a reference clock from a lower
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 200 MHz. With a reference output,
this chip plus an inexpensive crystal can replace two
oscillators.
Stored in the chip's ROM is the ability to generate
nine different popular multiplication factors,
allowing one chip to output many common
frequencies (see page 2).
Block Diagram
Description
Features
Crystal or
clock input
X1/ICLK
X2
Optional crystal capacitors
CLK
Crystal
Oscillator
VDD GND
PLL
Clock
Synthesis
and Control
Circuitry
Output
Buffer
REF
Output
Buffer
S1, S0
2
ICS512
LOCOTM PLL Clock Multiplier
MDS 512 C
2
Revision 061900
Printed 11/13/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126(408) 295-9800tel 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
XI
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
T I
Multiplier select pin 0. Connect to GND or VDD or float (no connection).
7
S1
T I
Multiplier select pin 1. Connect to GND or VDD or float (no connection).
8
X2
XO
Crystal connection. Leave unconnected for clock input.
Pin Descriptions
Key: XI/XO = crystal connections, TI = tri-level input, O = output, P = power supply connection
S1
S0
CLK
0
0
4X input
0
M
5.333X input
0
1
5X input
M
0
2.5X input
M
M
2X input
M
1
3.333X input
1
0
6X input
1
M
3X input
1
1
8X input
Clock Output Table
0 = connect directly to ground.
1 = connect directly to VDD.
M = leave unconnected (floating).
Output
20
24
30
32
33.33
37.5
40
48
50
60
64
Input
10
12
10
16
16.66
15
10
12
20
10
16
Selection (S1, S0)
M, M
M, M
1, M
M, M
M, M
M, 0
0, 0
0, 0
M, 0
1, 0
0, 0
Output
66.66
72
75
80
83.33
90
100
120
125
133.33
150
Input
20
12
25
10
25
15
20
15
25
25
25
Selection (S1, S0)
M, 1
1, 0
1, M
1, 1
M, 1
1, 0
0, 1
1, 1
0, 1
0, M
1, 0
Common Output Frequencies Examples (MHz)
Note that all of the above outputs are achieved by using a common, inexpensive 10MHz to 25MHz crystal.
Consult ICS on how to achieve other output frequencies.
ICS512
LOCOTM PLL Clock Multiplier
MDS 512 C
3
Revision 061900
Printed 11/13/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126(408) 295-9800tel www.icst.com
Electrical Specifications
Parameter
Conditions
Minimum
Typical
Maximum
Units
ABSOLUTE MAXIMUM RATINGS (stresses bee ond these can permaneentl damage tthe 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
ICS512MI only
-40
85
C
Soldering Temperature
Max of 10 seconds
260
C
Storage temperature
-65
150
C
DC CHARACTERISTICS (VDD = 3.3V unless ootherwise 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, S1
VDD-0.5
V
Input Low Voltage, VIL
S0, S1
0.5
V
Output High Voltage, VOH, CMOS high
IOH=-8mA
VDD-0.4
V
Output High Voltage, VOH
IOH=-12mA
2.4
V
Output Low Voltage, VOL
IOL=12mA
0.4
V
IDD Operating Supply Current, 20 MHz crystal No Load, 100MHz
9
mA
Short Circuit Current
CLK output
70
mA
Input Capacitance, S1, S0
Pins 6, 7
4
pF
AC CHARACTERISTICS (VDD = 3.3V unless ootherwise noted)
Input Frequency, crystal input
5
27
M H z
Input Frequency, clock input
2
50
M H z
Output Frequency, VDD = 4.5 to 5.5V
0 to +70 C
14
200
M H z
Note 1
-40 to +85 C
14
160
M H z
Output Frequency, VDD = 3.0 to 3.6V
0 to +70 C
14
160
M H z
Note 1
-40 to +85 C
14
145
M H z
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
200
ps
One Sigma Clock Period Jitter
80
ps
Note 1: The phase relationship between input and output clocks can change at power up. For a fixed phase relationship, see the ICS570
or the ICS527.
ICS512
LOCOTM PLL Clock Multiplier
MDS 512 C
4
Revision 061900
Printed 11/13/00
Integrated Circuit Systems, Inc. 525 Race Street San Jose CA95126(408) 295-9800tel 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.
Ordering Information
Part/Order Number
Marking
Package
Temperature
ICS512M
ICS512M
8 pin SOIC
0 to 70 C
ICS512MT
ICS512M
8 pin SOIC on tape and reel
0 to 70 C
ICS512MI
ICS512I
8 pin SOIC
-40 to +85 C
ICS512MIT
ICS512I
8 pin SOIC on tape and reel
-40 to +85 C
External Components / Crystal Selection
The ICS512 requires a 0.01F decoupling capacitor to be connected between VDD and GND. It must be
connected close to the ICS512 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 and REF pins. The total on-chip
capacitance is approximately 15 pF, so a parallel resonant, fundamental mode crystal should be used. For
crystals with a specified load capacitance greater than 15 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 = (C
L
-15)*2, where C
L
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).
LOCO is a trademark of ICS
Package Outline and Package Dimensions
(For current dimensional specifications, see JEDEC 95.)
B
D
E
H
e
A1
C
A
h x 45
L
INDEX
AREA
1
2
8 pin SOIC
Inch
hes
Millim
meters
Symbol
Min
Max
Min
Max
A
0.0532
0.0688
1.35
1.75
A1
0.0040
0.0098
0.10
0.24
B
0.0130
0.0200
0.33
0.51
C
0.0075
0.0098
0.19
0.24
D
0.1890
0.1968
4.80
5.00
E
0.1497
0.1574
3.80
4.00
e
.050 BSSC
1.27 BSSC
H
0.2284
0.2440
5.80
6.20
h
0.0099
0.0195
0.25
0.50
L
0.0160
0.0500
0.41
1.27
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