LOCO PLL Clock Multiplier - Integrated Circuit Systems
Description
ICS502 LOCO™ PLL Clock Multiplier
Description
The ICS502 LOCO™ 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).
Features
• 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
Block Diagram
VDD GND
2 S1, S0 PLL Clock Synthesis and Control Circuitry Output Buffer CLK
crystal or clock
X1/ICLK
Crystal Oscillator
X2
Output Buffer
REF
MDS 502 D 1 Revision 111000 Integrated Circuit Systems, Inc.
• 525 Race Street • San Jose •CA•95126•(408) 295-9800tel • www.
icst.
com
ICS502 LOCO™ PLL Clock Multiplier
Pin Assignment
X1/ICLK VDD GND REF 1 2 3 4 8 7 6 5 X2 S1 S0 CLK
Clock Decoding Table (MHz)
S1 0 0 M M 1 1 S0 0 1 0 1 0 1 CLK x2 x5 x3 x3.
33 x4 x2.
5
Minimum input frequency for all selections is per table on page 3.
0 = connect directly to ground.
1 = connect directly to VDD.
M = leave unconnected (floating).
Common Output Frequencies Examples (MHz)
Output Input Selection (S1, S0) Output Input Selection (S1, S0) 20 10 0, 0 64 16 1, 0 25 10 1, 1 66.
66 20 M, 1 30 10 M, 0 72 24 M, 0 32 16 0, 0 75 ...
Similar Datasheet
