ICS843251I-12 Datasheet, PDF (1/12 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251I-12
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS843251I-12 is a 10Gb Ethernet Clock
ICS
Generator and a member of the HiPerClocks^TM
HiPerClockS™ _{family of high performance devices from ICS. The}
ICS843251I-12 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 ICS843251I-12
is packaged in a small 8-pin TSSOP, making it ideal for
use in systems with limited board space.
FEATURES
• One Differential LVPECL output
• Crystal oscillator interface, 18pF parallel resonant crystal
(23.2MHz - 30MHz)
• Output frequency range: 290MHz - 750MHz
• VCO range: 580MHz - 750MHz
• RMS phase jitter @ 312.5MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.36ps (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
Crystal Frequency
(MHz)
25
Inputs
FREQ_SEL M
0
25
25
1
25
Output Frequency
N
Multiplication Value
M/N
(MHz)
1
25
625
2
12.5
312.5
BLOCK DIAGRAM
FREQ_SEL ^Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
580MHz - 750MHz
M = ÷25 (fixed)
FREQ_SEL N
0
÷1
1
÷2
PIN ASSIGNMENT
VCCA 1
8 VCC
VEE 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 FREQ_SEL
nQ
ICS843251I-12
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.
843251BGI-12
www.icst.com/products/hiperclocks.html
REV. A JANUARY 10, 2006
1