ICS409
MDS 409 C 1 Revision 111005
Integrated Circuit Systems l 525 Race Street, San Jose, CA 95126 l tel (408) 297-1201 l www.icst.com
PC PERIPHERAL CLOCK
Description
The ICS409 is a cost-effective clock synthesizer
developed to optimize component count for PC
peripheral applications. The device supports a
common, low cost 14.31818 MHz crystal using an
on-chip crystal oscillator. The device locks all output
frequencies to enhance system performance. By
supporting common PC peripheral interface
frequencies including dual 25 MHz and 40/80 MHz
frequencies the clock lowers chip count enhancing
system cost and reliability.
The ICS409 utilizes a low pin count 8-pin SOIC
package to optimize board space.
ICS is a leader in low jitter and power consumer
application clock sources. These devices are capable
of supporting CCD, video, audio, USB, CPU, and other
peripherals.
Features
• Pin compatible with FS6286-01
• Low operating voltage of 3.3V
• On-chip oscillator supports 14.31818 MHz crystal
• Fixed dual 25 MHz clocks for Ethernet
• 40/80 MHz selected on rising edge of OE/LAT pin
• Power consumption of 15 mA (typ)
• Duty cycle of 45 to 55%
• Packaged in 8-pin SOIC
• Available in Pb (lead) free package
Block Diagram
25M
Crystal
O s c illa to r
X1
X2
14.31818 M Hz
Fundam ental
Crystal
PLL
25M
40/80M
VDD
GND
OE/LAT
