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PDF ICS844031I-01 Data sheet ( Hoja de datos )
| Número de pieza | ICS844031I-01 | |
| Descripción | CRYSTAL-TO- LVDS CLOCK GENERATOR | |
| Fabricantes | ICS | |
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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844031I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS844031I-01 is an Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from ICS. The
ICS844031I-01 uses an 18pF parallel resonant
crystal over the range of 19.6MHz - 27.2MHz. For
Ethernet applications, a 25MHz crystal is used to generate
312.5MHz. The ICS844031I-01 has excellent <1ps phase jitter
performance, over the 1.875MHz - 20MHz integration range.
The ICS844031I-01 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
(19.6MHz - 27.2MHz)
• Output frequency range: 245MHz - 340MHz
• VCO range: 490MHz - 680MHz
• RMS phase jitter @ 312.5MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.49ps (typical)
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
COMMON CONFIGURATION TABLE
Inputs
Crystal Frequency (MHz) M
25 25
Output Frequency
N
Multiplication
Value M/N
(MHz)
2 12.5
312.5
BLOCK DIAGRAM
OE Pullup
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
490MHz - 680MHz
N = ÷2 (fixed)
M = ÷25 (fixed)
Q
nQ
PIN ASSIGNMENT
VDDA
GND
XTAL_OUT
XTAL_IN
1
2
3
4
8 VDD
7Q
6 nQ
5 OE
ICS844031I-01
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.
844031AGI-01
www.icst.com/products/hiperclocks.html
REV. B JULY 6, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844031I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
TYPICAL PHASE NOISE AT 312.5MHZ
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
100
Ethernet Filter
312.5MHz
RMS Phase Jitter (Random)
1.875MHz to 20MHz = 0.49ps (typical)
Raw Phase Noise Data
Phase Noise Result by adding
an Ethernet Filter to raw data
1k
10k 100k 1M
10M 100M
OFFSET FREQUENCY (HZ)
844031AGI-01
www.icst.com/products/hiperclocks.html
5
REV. B JULY 6, 2005
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844031I-01
FEMTOCLOCKS™CRYSTAL-TO- LVDS
CLOCK GENERATOR
PACKAGE OUTLINE - G SUFFIX FOR 8 LEAD TSSOP
844031AGI-01
TABLE 8. PACKAGE DIMENSIONS
SYMBOL
Millimeters
Minimum
Maximum
N8
A -- 1.20
A1 0.05 0.15
A2 0.80 1.05
b 0.19 0.30
c 0.09 0.20
D 2.90 3.10
E 6.40 BASIC
E1 4.30 4.50
e 0.65 BASIC
L 0.45 0.75
α 0° 8°
aaa -- 0.10
Reference Document: JEDEC Publication 95, MO-153
www.icst.com/products/hiperclocks.html
11
REV. B JULY 6, 2005
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ICS844031I-01.PDF ] | |
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