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PDF SM802141 Data sheet ( Hoja de datos )
| Número de pieza | SM802141 | |
| Descripción | Ultra-Low Jitter LVPECL Frequency Synthesizer | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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SM802141
ClockWorks Selectable 62.5MHz,
125MHz, 156.25MHz and 312.5MHz
Ultra-Low Jitter, LVPECL Frequency
Synthesizer
General Description
The SM802141 is a part of Micrel’s ClockWorks family of
devices and provides an extremely low-noise timing
solution for Ethernet clock signals.
The device operates from a 3.3V or 2.5V power supply
and synthesizes differential LVPECL output clocks at
62.5MHz, 125MHz, 156.25MHz or 312.5MHz, selectable
through logic control pins. The SM802141 accepts a
25MHz crystal or LVCMOS reference clock.
Data sheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
Configurable to generate up to four different LVPECL
clock frequencies
2.5V or 3.3V operating range
Typical phase jitter @ 125MHz
(12kHz to 20MHz): 255 fsrms
Industrial temperature range (–40C to +85C)
Green, RoHS, and PFOS compliant
Available in 24-pin 4mm 4mm QFN package
Applications
Ethernet PHY
Storage networking (SAN, NAS)
Block Diagram
ClockWorks is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
April 2012
M9999-041812-A
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
SM802141
LVCMOS (PLL_BYPASS, XTAL_SEL, OE1/2, FSEL) DC Electrical Characteristics(4)
VDD = 3.3V 5%, or 2.5V 5%, TA = 40C to 85C.
Symbol
VIH
VIL
IIH
IIL
Parameter
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Condition
VDD = VIN = 3.465V
VDD = 3.465V, VIN = 0V
Min.
2
0.3
150
Typ.
Max.
VDD + 0.3
0.8
150
Units
V
V
A
A
REF_IN DC Electrical Characteristics(4)
VDD = 3.3V 5%, or 2.5V 5%, TA = 40C to 85C.
Symbol
VIH
VIL
Parameter
Input High Voltage
Input Low Voltage
Condition
IIN
Input Current
XTAL_SEL = VIL, VIN = 0V to VDD
XTAL_SEL = VIH, VIN = VDD
Min.
1.1
0.3
5
Typ.
20
Max.
VDD + 0.3
0.6
5
Units
V
V
A
µA
Crystal Characteristics
Parameter
Mode of Oscillation
Frequency
Equivalent Series Resistance (ESR)
Shunt Capacitor, C0
Correlation Drive Level
Condition
10pF Load
Min.
Typ.
Max.
Units
Fundamental, Parallel Resonant
25 MHz
50 Ω
1 5 pF
10 100 uW
April 2012
5 M9999-041812-A
[email protected] or (408) 955-1690
5 Page 
Micrel, Inc.
SM802141
Figure 1. Duty Cycle Timing
Figure 2. All Outputs Rise/Fall Time
Figure 3. RMS Phase Noise Jitter
April 2012
11 M9999-041812-A
[email protected] or (408) 955-1690
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SM802141.PDF ] | |
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