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ICS844051I Datasheet Preview

ICS844051I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844051I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844051I is a Gigabit Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS.
The ICS844051I can synthesize 10 Gigabit
Ethernet, SONET, or Serial ATA reference clock
frequencies with the appropriate choice of crystal and output
divider. The ICS844051I has excellent phase jitter perfor-
mance and is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
FEATURES
One Differential LVDS output
Crystal oscillator interface designed for
18pF parallel resonant crystals (18.125MHz - 23.4375MHz)
Output frequency range: 145MHz - 187.5MHz and
72.5MHz - 93.75MHz
VCO range: 580MHz - 750MHz
RMS phase jitter @156.25MHz (1.875MHz - 20MHz):
0.45ps (typical)
3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
Available in both standard and lead-free RoHS-compliant
packages
FREQUENCY TABLE
Inputs
Crystal Frequency (MHz)
20.141601
20.141601
19.53125
19.53125
19.44
19.44
18.75
18.75
FREQ_SEL
0
1
0
1
0
1
0
1
Output Frequency
(MHz)
161.132812
80.566406
156.25
78.125
155.52
77.76
150
75
BLOCK DIAGRAM
PIN ASSIGNMENT
FREQ_SEL Pulldown
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
÷32
(fixed)
0 ÷4 (default)
1 ÷8
VDDA
GND
Q XTAL_OUT
nQ XTAL_IN
1
2
3
4
8 VDD
7Q
6 nQ
5 FREQ_SEL
ICS844051I
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.
844051CGI
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 23, 2005
1




ICS

ICS844051I Datasheet Preview

ICS844051I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844051I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
VDDA
Power
2
GND
Power
Analog supply pin.
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
Power 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
844051CGI
www.icst.com/products/hiperclocks.html
2
REV. A NOVEMBER 23, 2005


Part Number ICS844051I
Description CRYSTAL-TO- LVDS CLOCK GENERATOR
Maker ICS
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