ICS843023I Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
ICS843023I
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS843023I is a Gigabit Ethernet Clock
ICS
Generator and a member of the HiPerClocks^TM
HiPerClockS™ _{family of high performance devices from ICS.}
The ICS843023I uses a 25MHz crystal to
synthesize 250MHz. The ICS843023I has
excellent phase jitter performance, over the 1.875MHz – 20MHz
integration range. The ICS843023I is packaged in a small
8-pin TSSOP, making it ideal for use in systems with
limited board space.
FEATURES
• 1 differential 3.3V LVPECL output
• Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
• Output frequency range: 245MHz - 320MHz
• VCO range: 490MHz - 640MHz
• RMS phase jitter @ 250MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.39ps (typical)
Phase noise:
Offset
Noise Power
100Hz ............... -86.3 dBc/Hz
1kHz .............. -114.6 dBc/Hz
10kHz .............. -125.6 dBc/Hz
100kHz ................ -126 dBc/Hz
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Lead-Free package fully RoHS compliant
BLOCK DIAGRAM
OE
25MHz
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
÷2
(fixed)
Q
nQ
÷20
(fixed)
PIN ASSIGNMENT
VCC 1
XTAL_OUT 2
XTAL_IN 3
VEE 4
8Q
7 nQ
6 VCC
5 OE
ICS843023I
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
843023AGI
www.icst.com/products/hiperclocks.html
1
REV. A JUNE 29, 2005