General Description

The ICS841664I is an optimized sRIO clock generator and a

member of the family of high-performance clock solutions from IDT.

The device uses a 25MHz parallel crystal to generate 125MHz and

156.25MHz clock signals, replacing solution requiring multiple

oscillator and fanout buffer solutions. The device has excellent phase

jitter (<1ps RMS) suitable to clock components requiring precise and

low-jitter sRIO clock signals. Designed for telecom, networking and

industrial application, the ICS841664I can also drive the high-speed

sRIO SerDes clock inputs of communication processors, DSPs,

switches and bridges.

Features

• Four differential HCSL clock outputs: configurable for sRIO

(125MHz or 156.25MHz) clock signals

One REF_OUT LVCMOS/LVTTL clock output

• Selectable crystal oscillator interface, 25MHz, 18pF parallel

resonant crystal or LVCMOS/LVTTL single-ended reference clock

input or LVCMOS/LVTTL single-ended input

• Supports the following output frequencies: 125MHz or 156.25MHz

• VCO: 625MHz

• Supports PLL bypass and output enable functions

• RMS phase jitter, using a 25MHz crystal (1.875MHz - 20MHz):

0.45ps (typical) @ 125MHz

• Full 3.3V power supply mode

• -40°C to 85°C ambient operating temperature

• Lead-free (RoHS 6) packaging