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PDF ICS844256 Data sheet ( Hoja de datos )
| Número de pieza | ICS844256 | |
| Descripción | CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER | |
| Fabricantes | ICS | |
| Logotipo |  |
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www.DataSheet4U.com
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844256
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
GENERAL DESCRIPTION
The ICS844256 is a Crystal-to-LVDS Clock
ICS Synthesizer/Fanout Buffer designed for SONET
HiPerClockS™ and Gigabit Ethernet applications and is a
member of the HiperClockS™ family of High
Performance Clock Solutions from ICS. The
output frequency can be set using the frequency select
pins and a 25MHz crystal for Ethernet frequencies, or a
19.44MHz crystal for SONET. The low phase noise charac-
teristics of the ICS844256 make it an ideal clock for these
demanding applications.
FEATURES
• Six LVDS outputs
• Crystal oscillator interface
• Output frequency range: 62.5MHz to 622.08MHz
• Crystal input frequency range: 15.625MHz to 25.5MHz
• RMS phase jitter at 125MHz, using a 25MHz crystal
(1.875MHz to 20MHz): 0.48ps (typical)
• Full 3.3V or 3.3V core, 2.5V output supply mode
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
SELECT FUNCTION TABLE
• Available in both standard and lead-free RoHS-compliant
packages
FB_SEL
0
0
0
0
1
1
1
1
Inputs
N_SEL1
0
0
1
1
0
0
1
1
N_SEL0
0
1
0
1
0
1
0
1
M Divide
25
25
25
25
32
32
32
32
Function
N Divide
1
2
4
5
1
2
4
8
M/N
25
12.5
6.25
5
32
16
8
4
BLOCK DIAGRAM
PIN ASSIGNMENT
PLL_BYPASS Pullup
XTAL_IN
XTAL_OUT
OSC
1 Output
PLL Divider
0
Q0
nQ0
Q1
nQ1
Q2
nQ2
VDDO
VDDO
nQ2
Q2
nQ1
Q1
nQ0
Q0
PLL_BYPASS
VDDA
VDD
FB_SEL
1
2
3
4
5
6
7
8
9
10
11
12
24 Q3
23 nQ3
22 Q4
21 nQ4
20 Q5
19 nQ5
18 N_SEL1
17 GND
16 GND
15 N_SEL0
14 XTAL_OUT
13 XTAL_IN
FB_SEL Pulldown
N_SEL1 Pullup
Pullup
N_SEL0
Feedback
Divider
Q3 ICS844256
24-Lead, 300-MIL SOIC
nQ3 7.5mm x 15.33mm x 2.3mm
body package
Q4 M Package
Top View
nQ4
24-Lead TSSOP
4.40mm x 7.8mm x 0.92mm
Q5 body package
nQ5 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.
844256AM
www.icst.com/products/hiperclocks.html
REV. A NOVEMBER 29, 2005
1
1 page  
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844256
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
TABLE
4D.
LVDS
DC
CHARACTERISTICS,
V
DD
=
V
DDA
=
V
DDO
=
3.3V±5%
TA
=
0°C
TO
70°C
Symbol Parameter
Test Conditions
Minimum
VOD Differential Output Voltage
Δ VOD
VOD Magnitude Change
VOS Offset Voltage
Δ VOS
VOS Magnitude Change
NOTE: Please refer to Parameter Measurement Information for output information.
Typical
350
40
1.25
50
Maximum
Units
mV
mV
V
mV
TABLE 4E. LVDS DC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, VDDO = 2.5V±5%, TA = 0°C TO 70°C
Symbol Parameter
Test Conditions
Minimum Typical
VOD
Δ VOD
VOS
Δ VOS
Differential Output Voltage
VOD Magnitude Change
Offset Voltage
VOS Magnitude Change
TBD
TBD
TBD
TBD
Maximum
Units
mV
mV
V
mV
TABLE 5. CRYSTAL CHARACTERISTICS
Parameter
Test Conditions
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitance
Drive Level
NOTE: Characterized using an 18pF parallel resonant crystal.
Minimum Typical Maximum
Fundamental
15.625
25.5
50
7
1
Units
MHz
Ω
pF
mW
844256AM
www.icst.com/products/hiperclocks.html
5
REV. A NOVEMBER 29, 2005
5 Page 
Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844256
FEMTOCLOCKS™CRYSTAL-TO-LVDS
FREQUENCY SYNTHESIZER W/INTEGRATED FANOUT BUFFER
RELIABILITY INFORMATION
TABLE 7A. θJAVS. AIR FLOW TABLE FOR 24 LEAD SOIC
θJA by Velocity (Linear Feet per Minute)
Multi-Layer PCB, JEDEC Standard Test Boards
0
50°C/W
200
43°C/W
500
38°C/W
NOTE: Most modern PCB designs use multi-layered boards.The data in the second row pertains to most designs.
TABLE 7B. θJAVS. AIR FLOW TABLE FOR 24 LEAD TSSOP
θJA by Velocity (Meters per Second)
Multi-Layer PCB, JEDEC Standard Test Boards
0
70°C/W
1
65°C/W
2.5
62°C/W
TRANSISTOR COUNT
The transistor count for ICS844256 is: 3887
844256AM
www.icst.com/products/hiperclocks.html
11
REV. A NOVEMBER 29, 2005
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ICS844256.PDF ] | |
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