ICS348-22 Datasheet, PDF (1/8 Pages) Integrated Circuit Systems – Quad PLL Field Programmable VersaClock Synthesizer

PRELIMINARY INFORMATION
ICS348-22
Quad PLL Field Programmable VersaClock Synthesizer
Description
The ICS348-22 field programmable clock synthesizer
generates up to 9 high-quality, high-frequency clock
outputs including multiple reference clocks from a low
frequency crystal or clock input. The ICS348-22 has
four independent on-chip PLLs and is designed to
replace crystals and crystal oscillators in most
electronic systems.
Using ICS’ VersaClock^TM software to configure PLLs
and outputs, the ICS348-22 contains a One-Time
Programmable (OTP) ROM to allow field
programmability. Programming features include eight
selectable configuration registers, up to two sets of four
low-skew outputs.
Using Phase-Locked Loop (PLL) techniques, the
device runs from a standard fundamental mode,
inexpensive crystal, or clock. It can replace multiple
crystals and oscillators, saving board space and cost.
Features
• Packaged as 20-pin SSOP (QSOP)
• Eight addressable registers
• Replaces multiple crystals and oscillators
• Output frequencies up to 189 MHz at 3.3 V
• Input crystal frequency of 25 MHz
• Up to nine reference outputs
• Up to two sets of four low-skew outputs
• Operating voltages of 3.3 V
• Advanced, low power CMOS process
• Available in Pb (lead) free packaging
Block Diagram
3
S2:S0
OTP
ROM
with PLL
Values
25 MHz
crystal input
X1
X2
Crystal
Oscillator
External capacitors are
required with a crystal input.
VDD ³
PLL1
PLL2
PLL3
PLL4
Divide
Logic
and
Output
Enable
Control
GND 2
PDTS
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
CLK9
MDS 348-22 A
1
Revision 120704
Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel [phone] ● www.icst.com