SM840002KATR [MICREL]
ClockWorks? Dual 10-Gigabit/Gigabit Ethernet 62.5MHz, 125MHz, or 156.25MHz; 发条？双万兆/千兆以太网中的62.5MHz ， 125MHz的，或156.25MHz
| 型号： | SM840002KATR |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | ClockWorks? Dual 10-Gigabit/Gigabit Ethernet 62.5MHz, 125MHz, or 156.25MHz |
| 文件： | 总9页 (文件大小：340K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SM840002
ClockWorks™ Dual 10-Gigabit/Gigabit
Ethernet 62.5MHz, 125MHz, or 156.25MHz,
Ultra-Low Jitter LVCMOS Clock Frequency
Synthesizer
General Description
Features
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.
• 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
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.
• 62.5MHz, 125MHz, or 156.25MHz output frequency
• Output Skew: 12ps (maximum)
• Phase Noise @ 156.25MHz:
− 1KHz:
−126dBc/Hz
−130dBc/Hz
−126dBc/Hz
−139dBc/Hz
−165dBc/Hz
−166/dBc/Hz
− 10KHz:
− 100KHz:
− 1MHz:
− 10MHz:
− 20MHz:
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.
• Temperature range: –40°C to +75°C
• Green-, RoHS-, and PFOS-compliant
• Available in 16-pin TSSOP
Applications
• Gigabit Ethernet
• 10-Gigabit Ethernet
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
M9999-110810-A
November 2010
hbwhelp@micrel.com or (408) 955-1690
Micrel, Inc.
SM840002
Block Diagram
Ordering Information(1)
Part Number
SM840002KA
SM840002KA TR(2)
Notes:
Package Type
K-16
Operating Range
–40°C to +75°C
–40°C to +75°C
Package Marking
840002
840002
K-16
1. Devices are Green-, RoHS-, and PFOS-compliant.
2. Tape and Reel.
Pin Configuration
16-Pin TSSOP (K-16)
M9999-110810
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November 2010
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Micrel, Inc.
SM840002
Pin Description
Pin Number
Pin Name
Type
Level
Pin Function
1
F_SEL0
I
Pull-Up
Frequency Select Pin. LVCMOS interface levels.
Selects between XTAL and TEST_CLK Reference Input. When HIGH,
selects TEST_CLK. When LOW, selects XTAL inputs. LVCMOS interface
levels.
2
nXTAL_SEL
I
Pull-Down
3
4
5
TEST_CLK
OE
I
I
Pull-Down
Pull-Up
Single-Ended LVCMOS Clock Input.
Output Enable. When HIGH, the outputs are active. When LOW, the
outputs are in a high impedance state. LVCMOS interface levels.
NC
No Connect.
Selects between the VCO reference and the VCO Output. When LOW,
the output is driven from the VCO output. When HIGH, the PLL is
bypassed.
6
nPLL_SEL
I
Pull-Down
7
VDDA
VDD
P
P
O
I
2.5V or 3.3V Output Power Supply. No filter resistor needed.
2.5V or 3.3V Output Power Supply.
8
9
XTAL_OUT
XTAL_IN
VDDO
12pF Crystal Crystal Reference Output, no load caps needed.
12pF Crystal Crystal Reference Input, no load caps needed.
2.5V or 3.3V Output Power Supply.
10
11
12
13
14
15
16
P
O
O
P
P
I
Q1
LVCMOS
LVCMOS
Single-Ended Output Clock.
Single-Ended Output Clock.
Ground.
Q0
GND
GND
Ground.
F_SEL1
Pull-up
Frequency Select Pin. LVCMOS interface levels.
Configuring the SM840002
Xtal Frequency (MHz)
F_SEL1
F_SEL0
M Divider
N Divider
Output Frequency (MHz)
25
25
25
25
0
0
1
1
0
1
0
1
125
130
130
130
20
26
52
26
156.25
125
62.5
125
M9999-110810
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November 2010
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Micrel, Inc.
SM840002
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VDD)...................................................+4.6V
Input Voltage (VIN)................................ –0.50V to VDD+0.5V
Output Voltage (VOUT) .......................... –0.50V to VDD+0.5V
Lead Temperature (soldering, 20sec.)....................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
Supply Voltage (VDDO).......................... +2.375V to +3.465V
Supply Voltage (VDD, VDDA)................... +2.375V to +3.465V
Ambient Temperature (TA) ..........................–40°C to +75°C
Junction Thermal Resistance
TSSOP (θJA)(Still Air).......................................127°C/W
DC Electrical Characteristics(3)
VDDA = VDD = 2.5V ±5%, VDDO = 2.5V ±5%, TA = –40°C to +75°C, unless noted.
Symbol
VDD
Parameter
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Core Supply Current
Analog Supply Current
Output Supply Current
Condition
Min.
2.375
2.375
2.375
Typ.
2.50
2.50
2.50
0.1
Max.
2.625
2.625
2.625
1
Units
V
VDDA
VDDO
IDD
V
V
mA
mA
mA
IDDA
48
55
IDDO
No Load
15
23
VDDA = VDD = 3.3V ±5%, VDDO = 3.3V ±5%, TA = –40°C to +75°C, unless noted.
Symbol Parameter
Condition
Min.
3.135
3.135
3.135
Typ.
3.30
3.30
3.30
0.1
Max.
3.465
3.465
3.465
1
Units
VDD
VDDA
VDDO
IDD
Core Supply Voltage
V
V
V
Analog Supply Voltage
Output Supply Voltage
Core Supply Current
Analog Supply Current
Power Supply Current
IDDA
49
55
mA
mA
IDDO
No Load
25
32
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. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
M9999-110810
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November 2010
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Micrel, Inc.
SM840002
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
VIH
Parameter
Condition
Min.
2
Typ.
Max.
Units
VDD
+
Input HIGH Voltage
Input LOW Voltage
V
V
0.3
VIL
0.80
5
−0.30
VDD = VIN =3.465V
or 2.625V
OE, F_SEL0, F_SEL1
µA
µA
µA
µA
IIH
Input HIGH Current
Input LOW Current
VDD = VIN =3.465V
nPLL_SEL, MR,
nXTAL_SEL, TEST_CLK
150
or 2.625V
VDD = 3.465V or 2.625V
OE, F_SEL0, F_SEL1
−150
−5
V
IN = 0V
IIL
VDD = 3.465V or 2.625V
nPLL_SEL, MR,
nXTAL_SEL, TEST_CLK
VIN = 0V
VDDO = 3.3V ±5%
2.6
1.8
V
V
VOH
VOL
Output HIGH Voltage(4)
Output LOW Voltage(4)
VDDO = 2.5V ±5%
VDDO = 3.3V ±5% or 2.5V
±5%
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.
156.25
125
Max.
Units
MHz
MHz
MHz
MHz
ps
FOUT
FOUT
Output Frequency
F_SEL[1:0] = 00
F_SEL[1:0] = 01
F_SEL[1:0] = 10
F_SEL[1:0] = 11
Output Frequency
Output Frequency
Output Frequency
Output Skew(6)
FOUT
62.5
FOUT
125
tSKEW
tJITTER
tJITTER
tJITTER
tR/tF
12
RMS Phase Jitter
RMS Phase Jitter
RMS Phase Jitter
Output Rise/ Fall Time
Output Duty Cycle
156.25MHz
125MHz
0.064
0.065
0.077
ps
ps
62.5MHz
ps
20% to 80%
100
48
350
52
ps
ODC
50
%
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.
M9999-110810
hbwhelp@micrel.com or (408) 955-1690
November 2010
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Micrel, Inc.
SM840002
Crystal Characteristics
Parameter
Condition
Min.
Typ.
Max.
Units
Mode of Oscillation
Frequency
12pF Load
Fundamental, Parallel Resonant
25
MHz
Ω
Equivalent Series Resistance (ESR)
Shunt Capacitor, C0
Correlation Drive Level
50
3
7
pF
100
300
uW
Phase Noise Plot: 62.5MHz @ 3.3V
Phase Noise Plot: 125MHz @ 3.3V
Phase Noise Plot: 156.25MHz @ 3.3V
M9999-110810
hbwhelp@micrel.com or (408) 955-1690
November 2010
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Micrel, Inc.
SM840002
Figure 1. Duty Cycle Timing
Figure 2. All Outputs Rise/Fall Time
Figure 3. RMS Phase Noise/Jitter
M9999-110810
hbwhelp@micrel.com or (408) 955-1690
November 2010
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Micrel, Inc.
SM840002
Figure 4. LVCMOS Output Load and Test Circuit
Figure 5. Crystal Input Interface
M9999-110810
hbwhelp@micrel.com or (408) 955-1690
November 2010
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Micrel, Inc.
SM840002
Package Information
16-Pin TSSOP (K-16)
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.
© 2010 Micrel, Incorporated.
M9999-110810
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November 2010
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