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ICS844001I Datasheet Preview

ICS844001I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844001I
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844001I is a Fibre Channel Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS.
The ICS844001I uses an 18pF parallel resonant
crystal over the range of 20.4MHz - 28.3MHz.
For Fibre Channel applications, a 26.5625MHz crystal is used.
The frequency select pin allows the device to generate
either 106.25MHz or 212.5MHz from a 26.5625MHz
cr ystal. To generate 187.5MHz for 12Gb Ethernet, a
23.4375MHz crystal is used. The ICS844001I uses ICS’ 3rd
generation low phase noise VCO technology and can
achieve <1ps typical rms phase jitter, easily meeting Fibre
Channel and Ethernet jitter requirements. The ICS844001I is
packaged in a small 8-pin TSSOP, making it ideal for use in
systems with limited board space.
FEATURES
(1) Differential LVDS output
Crystal oscillator interface, 18pF parallel resonant crystal
(20.4MHz - 28.3MHz)
Output frequency range: 81.66MHz - 226.66MHz
VCO range: 490MHz - 680MHz
RMS phase jitter @ 106.25MHz, using a 26.5625MHz crystal
(637kHz - 10MHz): 0.74ps (typical)
3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
COMMON CONFIGURATION TABLE - FIBRE CHANNEL, 12Gb ETHERNET
Inputs
Crystal Frequency (MHz) FREQ_SEL
26.5625
26.5625
23.4375
0
1
1
M
24
24
24
N
Multiplication
Value M/N
64
38
38
Output Frequency
(MHz)
106.25
212.5
187.5
BLOCK DIAGRAM
FREQ_SEL Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
M = ÷24 (fixed)
÷3 1
÷6 0
Q
nQ
PIN ASSIGNMENT
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7Q
6 nQ
5 FREQ_SEL
ICS844001I
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
844001AGI
www.icst.com/products/hiperclocks.html
REV. A JUNE 16, 2005
1




ICS

ICS844001I Datasheet Preview

ICS844001I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844001I
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
VDDA
Power
Analog supply pin.
2
GND
Power
Power supply ground.
3, 4
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
5 FREQ_SEL Input Pullup Frequency select pin.
6, 7
nQ, Q
Output
Differential clock outputs. LVDS interface levels.
8 VDD Power
Core supply pin.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
844001AGI
www.icst.com/products/hiperclocks.html
2
REV. A JUNE 16, 2005


Part Number ICS844001I
Description CRYSTAL-TO- LVDS CLOCK GENERATOR
Maker ICS
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ICS844001I Datasheet PDF






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