ICS844071 Datasheet, PDF (1/15 Pages) Integrated Device Technology – FEMTOCLOCKS™ CRYSTAL-TO-LVDS CLOCK GENERATOR

FEMTOCLOCKS™ CRYSTAL-TO-LVDS
CLOCK GENERATOR
General Description
ICS
HiPerClockS™
The ICS844071 is a Serial ATA (SATA)/Serial
Attached SCSI (SAS) Clock Generator and a
member of the HiPerClocks^TM family of high
performance devices from IDT. The ICS844071
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 ICS844071 has excellent
<1ps phase jitter performance, over the 900kHz - 7.5MHz
integration range. The ICS844071 is packaged in a small 8-pin
TSSOP, making it ideal for use in systems with limited board
space.
ICS844071
Features
• One 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 at 150MHz, using a 25MHz crystal
(900kHz – 7.5MHz): 0.45ps (typical)
• Full 3.3V or 2.5V operating supply
• 0°C to 70°C ambient operating temperature
• Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Table 1. Common Configuration Table
Inputs
Crystal Frequency (MHz) FREQ_SEL M
25
0
24
25
1
24
26.041666
0
24
26.041666
1
24
26.5625
0
24
26.5625
1
24
N
Multiplication Value M/N
4
6
8
3
4
6
8
3
4
6
8
3
Output Frequency
(MHz)
150
75
156.25
78.125
159.375
79.675
Block Diagram
FREQ_SEL ^Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
500MHz - 680MHz
FREQ_SEL N
0
÷4
1 (Default) ÷8
Q
nQ
M = ÷24 (fixed)
Pin Assignment
VDD 1
GND 2
XTAL_OUT 3
XTAL_IN 4
8 VDD
7Q
6 nQ
5 ^FREQ_SEL
ICS844071
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
IDT™ / ICS™ LVDS CLOCK GENERATOR
1
ICS844071AG SEPTEMBER 26, 2007