ICST ICS501-DPF, ICS501-DWF, ICS501M, ICS501MI, ICS501MIT Datasheet
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ICS501
LOCO™ PLL Clock Multiplier
MDS 501 G 1 Revision 030201
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800 tel • www.icst.com
• Packaged as 8 pin SOIC or die
• ICS’ lowest cost PLL clock
• Zero ppm multiplication error
• Input crystal frequency of 5 - 27 MHz
• Input clock frequency of 2 - 50 MHz
• Output clock frequencies up to 160 MHz
• Extremely low jitter - 25 ps one sigma
• Compatible with all popular CPUs
• Duty cycle of 45/55 up to 160 MHz
• Mask option for 9 selectable frequencies
• Operating voltages of 3.0 to 5.5V
• Tri-state output for board level testing
• 25mA drive capability at TTL levels
• Ideal for oscillator replacement
• Industrial temperature version available
• Advanced, low power CMOS process
The ICS501 LOCO™ is the most cost effective
way to generate a high quality, high frequency
clock output 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 PhaseLocked-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
9 different multiplication factors, allowing one
chip to output many common frequencies (see
page 2).
The device also has an Output Enable pin that tristates the clock output when the OE pin is taken
low.
Block Diagram
Description
Features
Crystal or
clock input
Crystal
Oscillator
VDD GND
PLL
Clock Multiplier
Circuitry
and
ROM
Output
Buffer
CLK
X1/ICLK
X2
Optional crystal capacitors
S1
S0
Output Enable
ICS501
LOCO™ PLL Clock Multiplier
MDS 501 G 2 Revision 030201
Integrated Circuit Systems, Inc. • 525 Race Street • San Jose •CA•95126•(408) 295-9800 tel • www.icst.com
Pin Assignment
1 8
2
3
4
7
6
5
X1/ICLK
VDD
GND
S1
X2
OE
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 S1 TI Select 1 for output clock. Connect to GND or VDD or float.
5 CLK O Clock output per Table above.
6 S0 TI Select 0 for output clock. Connect to GND or VDD or float.
7 OE I Output Enable. Tri-states CLK output when low. Internal pull-up.
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
S1 S0 CLK Minimum Input
0 0 4X input per page 3
0 M 5.3125X input 20MHz
0 1 5X input per page 3
M 0 6.25X input 4MHz
M M 2X input per page 3
M 1 3.125X input 8MHz
1 0 6X input per page 3
1 M 3X input per page 3
1 1 8X input per page 3
Clock Output Table
Output 20 24 30 32 33.33 37.5 40 48 50 60 62.5
Input 10 12 10 16 16.66 12 10 12 16.66 10 20
Selection (S1, S0) M, M M, M 1, M M, M M, M M, 1 0, 0 0, 0 1, M 1, 0 M, 1
Output 64 66.66 72 75 80 83.33 90 100 106.25 120 125
Input 16 16.66 12 12 10 16.66 15 20 20 15 20
Selection (S1, S0) 0, 0 0, 0 1, 0 M, 0 1, 1 0, 1 1, 0 0, 1 0, M 1, 1 M, 0
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 a common, inexpensive 10MHz to 20MHz crystal.
Consult MicroClock/ICS on how to achieve other output frequencies.
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