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ICS844251I-15 Datasheet Preview

ICS844251I-15 Datasheet

CRYSTAL-TO-LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844251I-15
FEMTOCLOCKS™ CRYSTAL-TO-LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844251I-15 is an Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS.
The ICS844251I-15 uses an 18pF parallel
resonant crystal over the range of 23.2MHz -
30MHz. For Ethernet applications, a 25MHz crystal is
used. The device has excellent <1ps phase jitter
performance, over the 1.875MHz - 20MHz integration
range. The ICS844251I-15 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, 18pF parallel resonant crystal
(23.2MHz - 30MHz)
Output frequency ranges: 116MHz - 150MHz and
580MHz - 750MHz
VCO range: 580MHz - 750MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.46ps (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
COMMON CONFIGURATION TABLE
Inputs
Crystal Frequency (MHz)
25
26.667
25
26.667
FREQ_SEL
1
1
0
0
M
25
25
25
25
Multiplication Value Output Frequency
N M/N
(MHz)
1 25
625
1 25
666.67
55
125
55
133.33
BLOCK DIAGRAM
FREQ_SEL Pulldown
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
580MHz - 750MHz
M = ÷25 (fixed)
FREQ_SEL N
0 ÷1
1 ÷5
PIN ASSIGNMENT
VDDA 1
8 VDD
GND 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 FREQ_SEL
nQ
ICS844251I-15
8-Lead TSSOP
4.4mm 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.
844251BGI-15
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 23, 2005
1




ICS

ICS844251I-15 Datasheet Preview

ICS844251I-15 Datasheet

CRYSTAL-TO-LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844251I-15
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 Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
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
RPULLDOWN
Parameter
Input Capacitance
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
844251BGI-15
www.icst.com/products/hiperclocks.html
2
REV. A NOVEMBER 23, 2005


Part Number ICS844251I-15
Description CRYSTAL-TO-LVDS CLOCK GENERATOR
Maker ICS
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