DATASHEET
LOCO™ PLL CLOCK MULTIPLIER
Description
The ICS501B LOCO
TM
is the most cost effective way to
generate a high-quality 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 Phase-Locked Loop (PLL) techniques, the
device uses a standard fundamental mode,
inexpensive crystal to produce output clocks up to 15
MHz.
Stored in the chip’s ROM is the ability to generate nine
different multiplication factors, allowing one chip to
output many common frequencies (see table on page
2).
The device also has an output enable pin which
tri-states the clock output when the OE pin is taken low.
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 or guaranteed.
For applications which require defined input to output
skew, use the ICS570B.
ICS501B
Features
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Packaged as 8 pin SOIC or die
Available in Pb (lead) free package
IDT’s lowest cost PLL clock
Zero ppm multiplication error
Output clock frequencies up to 15 MHz
Extremely low jitter of 25 ps (one sigma)
Compatible with popular CPUs
Duty cycle of 45/55 up to 20 MHz
Nine selectable frequencies
Operating voltage of 3.3 V or 5.5 V
Tri-state output for board level testing
25 mA drive capability at TTL levels
Ideal for oscillator replacement
Industrial temperature version available
Advanced, low-power CMOS process
NOTE: EOL for non-green parts to occur on
5/13/10 per PDN U-09-01
Block Diagram
VDD
S1:0
X1/ICLK
Crystal or
Clock input
X2
2
Crystal
Oscillator
PLL Clock
Multiplier
Circuitry
and ROM
CLK
Optional crystal capacitors
GND
OE
IDT™ / ICS™
LOCO™ PLL CLOCK MULTIPLIER
1
ICS501B
REV E 092209
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
