ICST ICS512M, ICS512MI, ICS512MIT, ICS512MT Datasheet
ICS512
p
LOCO™ PLL Clock Multiplier
Description
The ICS512 LOCO™ 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).
Features
• 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
Block Diagram
VDD GND
S1, S0
Crystal or
clock in
Optional crystal capacitors
MDS 512 C 1 Revision 061900 Printed 11/13/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
ut
X1/ICLK
Oscillator
X2
2
PLL
Clock
Synthesis
and Control
Circuitry
Crystal
Output
Buffer
Output
Buffer
CLK
REF
ICS512
g
p
LOCO™ PLL Clock Multiplier
Pin Assignment
X1/ICLK
VDD
GND
REF
18
2
3
4
X2
7
S1
6
S0
5
CLK
Clock Output Table
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
0 = connect directly to ground.
1 = connect directly to VDD.
M = leave unconnected (floatin
).
Common Output Frequencies Examples (MHz)
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
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 out
ut frequencies.
Pin Descriptions
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 TI Multiplier select pin 0. Connect to GND or VDD or float (no connection).
7 S1 TI Multiplier select pin 1. Connect to GND or VDD or float (no connection).
8 X2 XO Crystal connection. Leave unconnected for clock input.
Key: XI/XO = crystal connections, TI = tri-level input, O = output, P = power supply connection
MDS 512 C 2 Revision 061900 Printed 11/13/00
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.icst.com
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