ICS844071I Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844071I
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844071I 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 ICS844071I
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. The ICS844071I has
excellent <1ps phase jitter performance, over the 12kHz -
20MHz integration range. The ICS844071I is packaged in a
small 8-pin TSSOP, making it ideal for use in systems with
limited board space.
FEATURES
• (1) Differential LVDS 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): 0.75ps (typical)
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Replaces ICS844051-11
COMMON CONFIGURATION TABLE
Inputs
Crystal Frequency (MHz) FREQ_SEL M
25
25
26.041666
26.041666
26.5625
26.5625
0
24
1
24
0
24
1
24
0
24
1
24
Output Frequency
N
Multiplication Value
M/N
(MHz)
4
6
150
8
3
75
4
6
156.25
8
3
78.125
4
6
159.375
8
3
79.675
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
VDDA 1
8 VDD
GND 2
7Q
XTAL_OUT 3
6 nQ
Q
XTAL_IN 4
5 FREQ_SEL
nQ
ICS844071I
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.
844071AGI
www.icst.com/products/hiperclocks.html
REV. A JULY 13, 2005
1