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PDF SM840002 Data sheet ( Hoja de datos )
| Número de pieza | SM840002 | |
| Descripción | Ultra-Low Jitter LVCMOS Clock Frequency Synthesizer | |
| Fabricantes | MICREL | |
| Logotipo |  |
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SM840002
ClockWorks™ Dual 10-Gigabit/Gigabit
Ethernet 62.5MHz, 125MHz, or 156.25MHz,
Ultra-Low Jitter LVCMOS Clock Frequency
Synthesizer
General Description
The SM840002 is a dual 10-Gigabit Ethernet and Gigabit
Ethernet, 62.5MHz, 125MHz, or 156.25MHz LVCMOS
clock frequency synthesizer and a member of the
ClockWorks™ family of devices from Micrel. It provides a
low-noise timing solution for high-speed, high-accuracy
synthesis of clock signals. It includes a patented
RotaryWave® architecture that provides a very stable clock
with very-low noise.
Power supplies of either 2.5V or 3.3V are supported, with
superior jitter and phase-noise performance. The device
synthesizes a 62.5MHz, 125MHz, or 156.25MHz, low-
noise LVCMOS output pair for Ethernet applications. The
crystal reference frequency is 25MHz.
The SM840002 is an excellent replacement for IDT
FemtoClocks®, with improved waveform integrity, and jitter.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Generates two LVCMOS outputs
• Operating supply modes:
− Core/Output
− 3.3V/3.3V, 2.5V/2.5V
• Typical phase jitter @156.25MHz~64 fs
(1.875MHz − 20MHz)
• Crystal frequency: 25MHz
• 62.5MHz, 125MHz, or 156.25MHz output frequency
• Output Skew: 12ps (maximum)
• Phase Noise @ 156.25MHz:
− 1KHz:
−126dBc/Hz
− 10KHz:
−130dBc/Hz
− 100KHz: −126dBc/Hz
− 1MHz:
−139dBc/Hz
− 10MHz:
−165dBc/Hz
− 20MHz:
−166/dBc/Hz
• Temperature range: –40°C to +75°C
• Green-, RoHS-, and PFOS-compliant
• Available in 16-pin TSSOP
Applications
• Gigabit Ethernet
• 10-Gigabit Ethernet
www.DataSheet4U.com
ClockWorks is a trademark of Micrel, Inc.
RotaryWave is a registered trademark of Multigig, Inc.
FemtoClocks is a registered trademark of IDT, 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
November 2010
M9999-110810-A
[email protected] or (408) 955-1690
1 page  
Micrel, Inc.
LVCMOS DC Electrical Characteristics(3)
VDDA = VDD =2.5V or 3.3V ±5%, VDDO = 2.5V or 3.3V ±5%, TA = –40°C to +75°C, unless noted.
Symbol Parameter
Condition
Min.
VIH Input HIGH Voltage
2
VIL Input LOW Voltage
−0.30
OE, F_SEL0, F_SEL1
VDD = VIN =3.465V
or 2.625V
IIH Input HIGH Current
nPLL_SEL, MR,
VDD = VIN =3.465V
nXTAL_SEL, TEST_CLK or 2.625V
IIL
Input LOW Current
OE, F_SEL0, F_SEL1
nPLL_SEL, MR,
nXTAL_SEL, TEST_CLK
VDD = 3.465V or 2.625V
VIN = 0V
VDD = 3.465V or 2.625V
VIN = 0V
−150
−5
VOH Output HIGH Voltage(4)
VDDO = 3.3V ±5%
VDDO = 2.5V ±5%
2.6
1.8
VOL Output LOW Voltage(4)
VDDO = 3.3V ±5% or 2.5V
±5%
SM840002
Typ.
Max.
VDD +
0.3
0.80
5
Units
V
V
µA
150 µA
µA
µA
V
V
0.5 V
AC Electrical Characteristics(5)
VDDA = VDD =2.5V or 3.3V ±5%, VDDO = 2.5V or 3.3V ±5%, TA = –40°C to +75°C, unless noted.
Symbol Parameter
Condition
Min.
Typ.
Max. Units
FOUT
Output Frequency
F_SEL[1:0] = 00
156.25
MHz
FOUT
Output Frequency
F_SEL[1:0] = 01
125 MHz
FOUT
Output Frequency
F_SEL[1:0] = 10
62.5 MHz
FOUT
tSKEW
Output Frequency
Output Skew(6)
F_SEL[1:0] = 11
125 MHz
12 ps
tJITTER
RMS Phase Jitter
156.25MHz
0.064
ps
tJITTER
RMS Phase Jitter
125MHz
0.065
ps
tJITTER
RMS Phase Jitter
62.5MHz
0.077
ps
tR/tF Output Rise/ Fall Time
20% to 80%
100 350 ps
ODC Output Duty Cycle
48 50 52 %
Notes:
4. Outputs terminated with 50Ω to VDD/2. See Parameters measurements 3.3V load test circuit.
5. The circuit is designed to meet the AC specifications shown in the above table(s) after thermal equilibrium has been established.
6. Defined as skew between outputs at the same supply voltage and with equal load conditions; Measured at the output differential crossing points.
www.DataSheet4U.com
November 2010
5 M9999-110810
[email protected] or (408) 955-1690
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet SM840002.PDF ] | |
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