SM802128UMG [MICREL]
ClockWorksΤΜ 10GbE Octal 156.25MHz,312.5MHz, Ultra-Low Jitter, LVPECL; ClockWorksΤΜ万兆以太网八路156.25MHz ， 312.5MHz ，超低抖动， LVPECL
| 型号： | SM802128UMG |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | ClockWorksΤΜ 10GbE Octal 156.25MHz,312.5MHz, Ultra-Low Jitter, LVPECL |
| 文件： | 总12页 (文件大小：262K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM802128
ClockWorksΤΜ 10GbE Octal 156.25MHz,
312.5MHz, Ultra-Low Jitter, LVPECL
Frequency Synthesizer
General Description
Features
The SM802128 is a member of the ClockWorks™ family of
devices from Micrel and provides an extremely low-noise
timing solution for 10GbE Ethernet clock signals. It is
based upon a unique patented RotaryWave® architecture
that provides very low phase noise.
• Generates eight LVPECL clocks at 156.25MHz or
312.5MHz
• 2.5V or 3.3V operating range
• Typical phase jitter @ 156.25MHz
(1.875MHz to 20MHz): 110fs with crystal reference
• Industrial temperature range (–40°C to +85°C)
• Green, RoHS, and PFOS compliant
The device operates from a 3.3V or 2.5V power supply
and synthesizes eight LVPECL output clocks at
156.25MHz or 312.5MHz. The SM802128 accepts a 25
MHz crystal or LVCMOS reference clock.
• Available in 44-pin 7mm × 7mm QFN package
Data sheet and support documentation can be found on
Micrel’s web site at: www.micrel.com.
________________________________________________________________________________________________________
Block Diagram
ClockWorks is a trademark of Micrel, Inc
RotaryWave is a registered trademark of Multigig, 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
hbwhelp@micrel.com or (408) 955-1690
January 2012
Micrel, Inc.
SM802128
Ordering Information (1)
Part Number
SM802128UMG
SM802128UMGTR
Note:
Marking
802128
802128
Shipping
Tray
Temperature Range
–40°C to +85°C
Package
44-Pin QFN
44-Pin QFN
Tape and Reel
–40°C to +85°C
1. Devices are Green, RoHS, and PFOS compliant.
Pin Configuration
44-Pin QFN
(Top View)
Pin Description
Pin Number
25, 26
28, 29
32, 33
35, 36
41, 42
1, 2
Pin Name
/Q1, Q1
/Q2, Q2
/Q3, Q3
/Q4, Q4
/Q5, Q5
/Q6, Q6
/Q7, Q7
/Q8, Q8
VDDO1
VDDO2
VSSO1
Pin Type
Pin Level
Pin Function
Differential Clock Outputs from Bank 1 (156.25MHz or
312.5MHz).
O, (DIF)
LVPECL
Differential Clock Outputs from Bank 2 (156.25MHz or
312.5MHz).
O, (DIF)
LVPECL
4, 5
7, 8
31, 37, 38
43, 44, 16
24, 39
PWR
PWR
PWR
Power Supply for the Outputs on Bank 1.
Power Supply for the Outputs on Bank 2.
Power Supply Ground for the Outputs on Bank 1.
January 2012
2
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SM802128
Pin Description (continued)
Pin Number
Pin Name
Pin Type
Pin Level
Pin Function
3, 6, 40
VSSO2
PWR
Power Supply Ground for the Outputs on Bank 2
11, 20, 27, 30,
34
TEST
Factory Test Pins. Do not connect anything to these pins.
Core Power Supply
12, 13
VDD
VSS
PWR
PWR
Core Power Supply Ground. The exposed pad must be
connected to the VSS ground plane.
21, 23
(Exposed
Pad)
17
18
REF_IN
I, (SE)
I, (SE)
LVCMOS
Crystal
Reference Clock Input
XTAL_IN
Crystal Reference Input, no load caps needed (See Figure 5).
Crystal Reference Output, no load caps needed (See Figure
5).
19
XTAL_OUT
O, (SE)
Crystal
Output Enable, Q1-Q4 disables to tri-state, 0 = Disabled, 1 =
Enabled, 45KΩ Pull-Up.
Output Enable, Q5-Q8 disables to tri-state, 0 = Disabled, 1 =
Enabled, 45KΩ Pull-Up.
15
22
OE1
OE2
I, (SE)
I, (SE)
LVCMOS
LVCMOS
PLL Bypass, Selects Output Source
0 = Normal PLL Operation
9
PLL_BYPASS
I, (SE)
LVCMOS
1 = Output from Input Reference Clock or Crystal
45Kꢀ Pull-Down
Selects PLL Input Reference Source
10
14
XTAL_SEL
FSEL
I, (SE)
I, (SE)
LVCMOS
LVCMOS
0 = REF_IN, 1 = XTAL, 45Kꢀ Pull-Up
Frequency Select, 1 = 156.25MHz, 0 = 312.5MHz,
45Kꢀ Pull-Up
Truth Tables
OE1/2
0
1
Tri-state
LVPECL
FSEL
Output Frequency (MHz)
0
1
312.5
156.25
PLL_BYPASS/CSB
XTAL_SEL
0
1
−
−
PLL
−
−
0
1
−
−
XTAL/REF_IN
REF_IN
XTAL
−
−
January 2012
3
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Micrel, Inc.
SM802128
Absolute Maximum Ratings (1)
Operating Ratings (2)
Supply Voltage (VDD, VDDO1/2) ……....................+4.6V
Input Voltage (VIN)……….…….…-0.50V to VDD+0.5V
Lead Temperature (soldering, 20sec.)…………260°C
Case Temperature……………………………….115°C
Storage Temperature (Ts)…………...-65°C to +150°C
Supply Voltage (VDD, VDDO1/2)............... +2.375V to +3.465V
Ambient Temperature (TA).......................... –40°C to +85°C
Junction Thermal Resistance(3)
QFN (θ JA)
Still-Air............................................................... 24°C/W
QFN (ψ JB)
Junction-to-Board................................................ 8°C/W
DC Electrical Characteristics (4)
VDD = VDDO1/2 = 3.3V ±5% or 2.5V ±5%
VDD = 3.3V ±5%, VDDO1/2 = 3.3V ±5% or 2.5V ±5%
TA = -40°C to +85°C.
Symbol
Parameter
Condition
Min.
2.375
3.135
Typ.
2.5
Max.
2.625
3.465
275
Units
VDD, VDDO1/2
VDD, VDDO1/2
2.5V Operating Voltage
3.3V Operating Voltage
VDDO1=VDDO2
VDDO1=VDDO2
156.25MHz
312.5MHz
V
V
3.3
220
275
IDD
Supply current VDD + VDDO
Outputs open
mA
345
LVPECL DC Electrical Characteristics (4)
VDD = VDDO1/2 = 3.3V ±5% or 2.5V ±5%
VDD = 3.3V ±5%, VDDO1/2 = 3.3V ±5% or 2.5V ±5%
TA = −40°C to +85°C. RL = 50ꢀ to VDDO-2V
Symbol
VOH
Parameter
Condition
Min.
VDDO – 1.145
VDDO – 1.945
0.6
Typ.
Max.
Units
Output High Voltage
Output Low Voltage
Output Voltage Swing
VDDO – 0.97 VDDO – 0.845
VDDO – 1.77 VDDO – 1.645
V
V
V
VOL
VSWING
0.8
1.0
LVCMOS (PLL_BYPASS, XTAL_SEL, OE1, OE2, FSEL) DC Electrical Characteristics (4)
VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C.
Symbol
VIH
Parameter
Condition
Min.
2
Typ.
Max.
VDD + 0.3
0.8
Units
V
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
VIL
V
−0.3
IIH
VDD = VIN = 3.465V
150
μA
μA
IIL
VDD = 3.465V, VIN = 0V
−150
January 2012
4
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Micrel, Inc.
SM802128
REF_IN DC Electrical Characteristics(4)
VDD = 3.3V ±5%, or 2.5V ±5%, TA = -40°C to +85°C.
Symbol
VIH
Parameter
Condition
Min.
1.1
Typ.
Max.
VDD + 0.3
0.6
Units
V
Input High Voltage
Input Low Voltage
VIL
V
−0.3
−5
XTAL_SEL = VIL, VIN = 0V to VDD
XTAL_SEL = VIH, VIN = VDD
5
μA
µA
IIN
Input Current
20
Crystal Characteristics
Parameter
Condition
Min.
Typ.
Max.
Units
Mode of Oscillation
Frequency
10pF Load
Fundamental, Parallel Resonant
25
MHz
ꢀ
Equivalent Series Resistance (ESR)
Shunt Capacitor, C0
Correlation Drive Level
50
1
5
pF
10
100
uW
January 2012
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Micrel, Inc.
SM802128
AC Electrical Characteristics(4, 5)
VDD = VDDO1/2 = 3.3V ±5% or 2.5V ±5%
VDD = 3.3V ±5%, VDDO1/2 = 3.3V ±5% or 2.5V ±5%
TA = −40°C to +85°C. RL = 50ꢀ to VDDO − 2V
Symbol
FOUT1
FOUT2
FREF
Parameter
Condition
FSEL = 1
FSEL = 0
Min
Typ
Max
Units
MHz
MHz
Output Frequency 1
Output Frequency 2
Reference Input Frequency
156.25
312.5
25
MHz
ps
20% – 80%
80
48
175
350
TR/TF
ODC
LVPECL Output Rise/Fall Time
Output Duty Cycle
50
52
45
20
%
ps
(6)
TSKEW
TLOCK
Output-to-Output Skew
PLL Lock Time
Q1 – Q8
ms
156.25MHz
110
250
Integration Range (1.875MHz – 20MHz)
Integration Range (12kHz – 20MHz)
RMS Phase Jitter(7)
fs
Tjit(∅)
312.5MHz
110
250
Integration Range (1.875MHz – 20MHz)
Integration Range (12kHz – 20MHz)
6.25MHz using 156.25MHz
12.5MHz using 312.5MHz
-80
-85
Spurious Noise Components
dBc
Notes:
1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB.
4. The circuit is designed to meet the AC and DC specifications shown in the above table after thermal equilibrium has been established.
5. All phase−noise measurements were taken with an Agilent 5052B phase−noise system.
6. Defined as skew between outputs at the same supply voltage and with equal load conditions and same frequency; measured at the output
differential crossing points.
7. Measured using a 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an
external reference, the phase noise will follow the input source phase noise up to about 1MHz offset frequency.
January 2012
6
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Micrel, Inc.
SM802128
Application Information
Input Reference
When operating with a crystal input reference, do not
apply a switching signal to REF_IN.
Crystal Layout
Keep the layers under the crystal as open as possible
and do not place switching signals or noisy supplies
under the crystal.
Crystal load capacitance is built inside the die so no
external capacitance is needed. See the Selecting a
quartz crystal for the Clockworks Flex I Family of
Precision Synthesizers application note for further
details.
Contact Micrel’s HBW applications group if you need
assistance on selecting a suitable crystal for your
application at: hbwhelp@micrel.com.
January 2012
7
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Micrel, Inc.
SM802128
Phase Noise Plots
Phase Noise Plot: 156.25MHz, 1.875MHz − 20MHz 108fs
Phase Noise Plot: 156.25MHz, 12kHz − 20MHz 244fs
January 2012
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Micrel, Inc.
SM802128
Phase Noise Plots (Continued)
Phase Noise Plot: 312.5MHz, 1.875MHz − 20MHz 113fs
Phase Noise Plot: 312.5MHz, 12kHz − 20MHz 248fs
January 2012
9
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Micrel, Inc.
SM802128
Figure 1. Duty Cycle Timing
Figure 2. All Outputs Rise/Fall Time
Figure 3. RMS Phase/Noise/Jitter
January 2012
10
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Micrel, Inc.
SM802128
Figure 4. LVPECL Output Load
Figure 5. Crystal Input Interface
January 2012
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Micrel, Inc.
SM802128
Package Information
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2012 Micrel, Incorporated.
January 2012
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