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ICS844071I Datasheet Preview

ICS844071I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844071I
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS844071I is a Serial ATA (SATA)/Serial
Attached SCSI (SAS) Clock Generator and a
HiPerClockS™ member of the HiPerClocksTM 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)
46
150
83
75
46
156.25
83
78.125
46
159.375
83
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




ICS

ICS844071I Datasheet Preview

ICS844071I Datasheet

CRYSTAL-TO- LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844071I
FEMTOCLOCKS™ CRYSTAL-TO- LVDS
CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
VDDA
Power
Analog supply pin.
2
GND
Power
Power supply ground.
3, 4
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
5 FREQ_SEL Input Pullup Frequency select pin. LVCMOS/LVTTL interface levels.
6, 7
nQ, Q
Output
Differential clock outputs. HSTL interface levels.
8 VDD Power
Core supply pin.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
844071AGI
www.icst.com/products/hiperclocks.html
2
REV. A JULY 13, 2005


Part Number ICS844071I
Description CRYSTAL-TO- LVDS CLOCK GENERATOR
Maker ICS
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