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ICS844022I-02 Datasheet Preview

ICS844022I-02 Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844022I-02
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844022I-02 is an Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS844022I-02 uses an 18pF parallel resonant
crystal over the range of 24.5MHz - 34MHz. For
Ethernet applications, a 25MHz crystal is used and either
62.5MHz or 125MHz may be selected with the FREQ_SEL
pin. The ICS844022I-02 has excellent <1ps phase jitter
performance, over the 1.875MHz - 20MHz integration range.
The ICS844022I-02 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
(24.5MHz - 34MHz)
Output frequency range: 61.25MHz - 170MHz
VCO range: 490MHz - 680MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.44ps (typical)
3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
COMMON CONFIGURATION TABLE - Gb ETHERNET
Inputs
Crystal Frequency (MHz) FREQ_SEL M
25
25
26.66
26.66
33.33
33.33
0 20
1 20
0 20
1 20
0 20
1 20
Output Frequency
N
Multiplication
Value M/N
(MHz)
45
125
8 2.5
62.5
45
133.33
8 2.5
66.66
45
166.66
8 2.5
83.33
BLOCK DIAGRAM
FREQ_SEL Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
M = ÷20 (fixed)
FREQ_SEL N
0 ÷4
1 ÷8
PIN ASSIGNMENT
VDDA 1
8 VDD
GND 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 FREQ_SEL
nQ
ICS844022I-02
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.
844022AGI-02
www.icst.com/products/hiperclocks.html
REV. A JUNE 28, 2005
1




ICS

ICS844022I-02 Datasheet Preview

ICS844022I-02 Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844022I-02
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 LVCMOS interface levels.
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
844022AGI-02
www.icst.com/products/hiperclocks.html
2
REV. A JUNE 28, 2005


Part Number ICS844022I-02
Description CRYSTAL-TO- LVDS CLOCK GENERATOR
Maker ICS
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