ICS843071I Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO- LVPECL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
ICS843071I
FEMTOCLOCKS™CRYSTAL-TO- LVPECL
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS843071I is a Serial ATA (SATA)/Serial
ICS
Attached SCSI (SAS) Clock Generator and a
HiPerClockS™ _{member of the HiPerClocks}TM _{family of high}
performance devices from ICS. The ICS843071I
uses an 18pF parallel resonant crystal over
the range of 20.833MHz - 28.3MHz. For SATA/SAS
applications, a 25MHz crystal is used and either 75MHz or
150MHz may be selected with the FREQ_SEL pin. For 10Gb
Fibre Channel applications, a 26.5625MHz crystal is used
for 159.375MHz output. The ICS843071I has excellent
<1ps phase jitter performance, over the 12kHz - 20MHz
integration range. The ICS843071I 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
(20.833MHz - 28.3MHz)
• Output frequency range: 62.5MHz - 170MHz
• VCO range: 500MHz - 680MHz
• RMS phase jitter @ 150MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.64ps (typical) @ 3.3V output
• RMS phase jitter @ 159.375MHz, using a 26.5625MHz
crystal (1.875MHz - 20MHz): 0.40ps (typical) @ 3.3V
output
• 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 - SERIAL ATA/SERIAL ATTACHED SCSI
Inputs
Crystal Frequency (MHz) FREQ_SEL M
25
25
26.5625
0
24
1
24
0
24
N
Multiplication
Value M/N
4
6
8
3
4
6
Output Frequency
(MHz)
150
75
159.375
BLOCK DIAGRAM
FREQ_SEL ^Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
500MHz - 680MHz
M = ÷24 (fixed)
FREQ_SEL N
0
÷4
1
÷8
PIN ASSIGNMENT
VCCA 1
8 VCC
XTAL_OUT 2
7Q
XTAL_IN 3
6 nQ
Q
VEE 4
5 FREQ_SEL
nQ
ICS843071I
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
843071AGI
www.icst.com/products/hiperclocks.html
1
REV. A JANUARY 11, 2006