SM840002 Datasheet PDF - MICREL

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SM840002
MICREL

Part Number SM840002
Description Ultra-Low Jitter LVCMOS Clock Frequency Synthesizer
Page 9 Pages


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SM840002
ClockWorksDual 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
ClockWorksfamily 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
hbwhelp@micrel.com or (408) 955-1690



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Micrel, Inc.
Block Diagram
SM840002
Ordering Information(1)
Part Number
SM840002KA
SM840002KA
TR(2)
Package Type
K-16
K-16
Notes:
1. Devices are Green-, RoHS-, and PFOS-compliant.
2. Tape and Reel.
Pin Configuration
Operating Range
–40°C to +75°C
–40°C to +75°C
Package Marking
840002
840002
www.DataSheet4U.com
November 2010
16-Pin TSSOP (K-16)
2 M9999-110810
hbwhelp@micrel.com or (408) 955-1690



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Micrel, Inc.
SM840002
Pin Description
Pin Number
1
Pin Name
F_SEL0
2 nXTAL_SEL
3 TEST_CLK
4 OE
5 NC
6 nPLL_SEL
7 VDDA
8 VDD
9 XTAL_OUT
10 XTAL_IN
11 VDDO
12 Q1
13 Q0
14 GND
15 GND
16 F_SEL1
Type
I
I
I
I
I
P
P
O
I
P
O
O
P
P
I
Level
Pull-Up
Pull-Down
Pull-Down
Pull-Up
Pull-Down
12pF Crystal
12pF Crystal
LVCMOS
LVCMOS
Pull-up
Pin Function
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.
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.
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.
2.5V or 3.3V Output Power Supply. No filter resistor needed.
2.5V or 3.3V Output Power Supply.
Crystal Reference Output, no load caps needed.
Crystal Reference Input, no load caps needed.
2.5V or 3.3V Output Power Supply.
Single-Ended Output Clock.
Single-Ended Output Clock.
Ground.
Ground.
Frequency Select Pin. LVCMOS interface levels.
Configuring the SM840002
Xtal Frequency (MHz)
25
25
25
25
F_SEL1
0
0
1
1
F_SEL0
0
1
0
1
M Divider
125
130
130
130
N Divider
20
26
52
26
Output Frequency (MHz)
156.25
125
62.5
125
www.DataSheet4U.com
November 2010
3 M9999-110810
hbwhelp@micrel.com or (408) 955-1690



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Micrel, Inc.
SM840002
Absolute Maximum Ratings(1)
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
Operating Ratings(2)
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
Parameter
Condition
VDD
VDDA
VDDO
IDD
IDDA
IDDO
Core Supply Voltage
Analog Supply Voltage
Output Supply Voltage
Core Supply Current
Analog Supply Current
Output Supply Current
No Load
Min.
2.375
2.375
2.375
Typ.
2.50
2.50
2.50
0.1
48
15
Max.
2.625
2.625
2.625
1
55
23
Units
V
V
V
mA
mA
mA
VDDA = VDD = 3.3V ±5%, VDDO = 3.3V ±5%, TA = –40°C to +75°C, unless noted.
Symbol Parameter
Condition
Min.
Typ.
Max.
Units
VDD Core Supply Voltage
3.135
3.30
3.465
V
VDDA
Analog Supply Voltage
3.135
3.30 3.465
V
VDDO
Output Supply Voltage
3.135
3.30
3.465
V
IDD Core Supply Current
0.1 1
IDDA Analog Supply Current
49 55 mA
IDDO Power Supply Current
No Load
25 32 mA
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.
www.DataSheet4U.com
November 2010
4 M9999-110810
hbwhelp@micrel.com or (408) 955-1690



SM840002 datasheet pdf
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