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ICS844023I Datasheet Preview

ICS844023I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844023I
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844023I is an Ethernet Clock Generator
ICS and a member of the HiPerClocksTM family of high
HiPerClockS™ performance devices from ICS. The ICS844023I
uses an 18pF parallel resonant crystal over the
range of 24.5MHz - 34MHz. For Ethernet appli-
cations, a 25MHz crystal is used to generate 250MHz. The
ICS844023I has excellent <1ps phase jitter performance, over
the 1.875MHz - 20MHz integration range. The ICS844023I 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
(24.5MHz - 34MHz)
Output frequency range: 245MHz - 340MHz
VCO range: 490MHz - 680MHz
RMS phase jitter @ 250MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.38ps (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) M
25 20
Output Frequency
N
Multiplication
Value M/N
(MHz)
2 10
250
BLOCK DIAGRAM
OE Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
N = ÷2 (fixed)
M = ÷20 (fixed)
Q
nQ
PIN ASSIGNMENT
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7Q
6 nQ
5 OE
ICS844023I
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.
844023AGI
www.icst.com/products/hiperclocks.html
REV. B JANUARY 6, 2006
1




ICS

ICS844023I Datasheet Preview

ICS844023I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844023I
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.
Output enable pin. When HIGH, Q/nQ output is active.
5 OE Input Pullup When LOW, the Q/nQ output is in a high impedance state.
LVCMOS/LVTTL 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
844023AGI
www.icst.com/products/hiperclocks.html
2
REV. B JANUARY 6, 2006


Part Number ICS844023I
Description CRYSTAL-TO- LVDS CLOCK GENERATOR
Maker ICS
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