SM840001
106.25MHz Ultra-Low Jitter Clock Synthesizer
General Description
The SM840001 synthesizer series were designed for Fibre Channel applications. The device design is optimized for 106.25MHz or 212.5MHz using a 26.5625MHz fundamental parallel resonant crystal, with stability and accuracy over the full operating range. The SM840001 includes a unique power reduction methodology, along with a patented RotaryWaveTM architecture, that provides a stable clock with very low noise for optimized performance. This yields an overall improved Bit Error Rate (BER) and improved waveform integrity. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com.
Features
• Generates a single LVCMOS/LVTTL output • Integrated loop filter components • RMS Phase Jitter: - 510 fs (typ) at 106.25MHz - 320 fs (typ) at 212.50MHz • Operates with either a 3.3V or 2.5V supply • Power consumption is <77mA @ 3.3 V • Fundamental crystal oscillator interface • Input frequency of 26.5625 MHz parallel resonant • Selectable output frequency: 106.25MHz or 212.5MHz • Temperature range: –40°C to +75°C • Available in 8-pin TSSOP package
Applications
• Fibre Channel • Storage ___________________________________________________________________________________________________________
Block Diagram
www.DataSheet4U.com
RotaryWave is a 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
March 2010
M9999-031810-B
[email protected] or (408) 955-1690
Micrel, Inc.
SM840001
Ordering Information(1)
Part Number SM840001KA SM840001KA TR
Note: 1. Devices are Green, RoHS-compliant and PFOS-compliant. 2. Tape and Reel.
(2)
Package Type K-8 K-8
Operating Range -40°C to +75°C -40°C to +75°C
Package Marking 840001 840001
Lead Finish NiPdAu NiPdAu
Pin Configuration
8-Pin TSSOP (K-8)
Pin Description
Pin Number 1 2 3 4 5 6 7 8 Pin Name VDDA OE XTAL OUT XTAL IN FSEL GND Q0 VDD Type P I O I I P O P Pull-down Pull-up Level Pin Function Analog Power. Output Enable: 1 = Enable, 0 = Disable. Crystal Out. Crystal Input. Frequency Select Pin. Ground. Single Ended LVCMOS Clock Out. Core Power.
Frequency Select Table
FSEL 0 1 Output (MHz) 106.25 (Default) 212.5
Output Enable
OE www.DataSheet4U.com 0 1 Output Disable Enable
March 2010
2
M9999-031810-B
[email protected] or (408) 955-1690
Micrel, Inc.
SM840001
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 (VIN)............................. +2.375V to +3.465V Ambient Temperature (TA) .......................... –40°C to +75°C Junction Thermal Resistance TSSOP (θJA).....................................................150°C/W
DC Electrical Characteristics
VDD = 2.5V ±5%; TA = –40°C to +75°C, unless noted.
Symbol VDD VDDA IDD IDDA Parameter Core Supply Voltage Analog Supply Voltage Core Supply Current Analog Supply Current No load Condition Min 2.375 2.375 Typ 2.50 2.50 12 48 Max 2.625 2.625 20 55 Units V V mA mA
DC Electrical Characteristics
VDD = 3.3V ±5%; TA = -40°C to +75°C, unless noted.
Symbol VDD VDDA IDD IDDA Parameter Core Supply Voltage Analog Supply Voltage Core Supply Current Analog Supply Current No load Condition Min 3.135 3.135 Typ 3.30 3.30 15 49 Max 3.465 3.465 22 55 Units V V mA mA
LVCMOS DC Characteristics
VDD = 2.5V and 3.3V ±5%; TA = -40°C to +75°C, unless noted.
Symbol VIH VIL VOH VOL IIH IIL Parameter Input HIGH Voltage Input LOW Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current Input LOW Current Output Enable input Output Enable input FSEL input FSEL input -5 -150 150 Condition VDD = 3.3V ±5% VDD = 2.5V ±5% VDD = 3.3V ±5% VDD = 2.5V ±5% VDD = 3.3V ±5% VDD = 2.5V ±5% Min 2 1.7 -0.30 -0.30 2.6 1.8 0.5 5 Typ Max VDD +0.3 VDD + 0.3 0.80 0.70 Units V V V V V V V µA µA µA µA
IIH Input HIGH Current www.DataSheet4U.com IIL Input LOW Current
Notes:
1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating.
March 2010
3
M9999-031810-B
[email protected] or (408) 955-1690
Micrel, Inc.
SM840001
AC Electrical Characteristics
VDD = 2.5V and 3.3V ±5%; TA = -40°C to +75°C, unless noted.
Symbol FOUT Parameter Output Frequency Condition FSEL=1 FSEL=0 106.25MHz, tJITTER RMS Phase Jitter Integration Range: 637kHz to 10MHz 212.50MHz Integration Range: 2.55MHz to 20MHz t R / tF ODC Output Rise/Fall Time Output Duty Cycle 20% to 80% 106.25MHz 212.50MHz 100 48 45 Min 186.66 93.33 Typ 212.5 106.25 510 320 350 52 55 Max 226.66 113.33 Units MHz MHz fs fs ps % %
3.3V Carrier Frequency, 106.25MHz
Offset fro.