SM802108UMG

SM802108 MICREL | Alldatasheet

Document overview

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Technical content

Features

• Generates two LVPECL cl ock outputs at 156.25MHz and two LVPECL clock outputs at 125MHz
• 2.5V or 3.3V operating range
• Typical phase jitter @ 156.25MHz (1.875MHz to 20MHz): 110fs (typical) at 3.3V
• Industrial temperature range
• Green, RoHS, and PFOS compliant
• Available in 24-pin 4mm × 4mm QFN package

Applications

• 10Gigabit Ethernet
• Gigabit Ethernet Block Diagram

Micrel, Inc. SM802108 January 2011 2 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690

Ordering Information

Part Number Marking Shipping Junction Temperature Range Package SM802108UMG 802108 Tube –40°C to +85°C 24-Pin QFN SM802108UMGR 802108 Tape and Reel –40°C to +85°C 24-Pin QFN Note: 1. Devices are Green, RoHS, and PFOS compliant. Pin Configuration 24-Pin QFN (Top View) Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 16, 17 20, 21 /Q0, Q0 /Q1, Q1 O, (DIF) LVPECL Differential Clock Outputs from Bank 1 156.25MHz 23, 24 3, 4 /Q2, Q2 /Q3, Q3 O, (DIF) LVPECL Differential Clock Outputs from Bank 2 125MHz

1 VDDO2 PWR Power Supply for Output Bank 2

2 VSSO2 PWR Power Supply Ground for Output Bank 2

5 PLL_BYPASS I, (SE) LVCMOS

PLL Bypass, Selects Output Source 0 = Normal PLL Operation 1 = Output from Input Reference Clock or Crystal 45KΩ pull-down

6 XTAL_SEL I, (SE) LVCMOS

Selects PLL Input Reference Source 0 = REF_IN, 1 = XTAL, 45KΩ pull-up

Micrel, Inc. SM802108 January 2011 3 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690 Pin Description (Continued) Pin Number Pin Name Pin Type Pin Level Pin Function 7, 12, 15, 19 TEST Factory Test Pins , Do not connect anything to these pins.

8 VDD PWR Core Power Supply

9 REF_IN I, (SE) LVCMOS Reference Clock Input

10 XIN I, (SE) 12pF crystal

Crystal Reference Input, no load caps needed. See Fig. 5.

11 XOUT O, (SE) 12pF crystal

Crystal Reference Output, no load caps needed. See Fig. 5. 13, 14 VSS PWR Core Power Supply Ground

18 VDDO1 PWR Power Supply for Output Bank 1

22 VSSO1 PWR Power Supply Ground for Output Bank 1

Application Information

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. Do not place switching signals or noisy supplies under the crystal. Truth Table PLL_BYPASS XTAL_SEL INPUT OUTPUT 0 − − PLL 1 − − XTAL/REF_IN − 0 REF_IN − − 1 XTAL −

Micrel, Inc. SM802108 January 2011 4 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690 Absolute Maximum Ratings(1) Operating Ratings(2) Junction Thermal Resistance(3) QFN ( θJA) QFN ( ψJB) 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. Typ. Max. Units VDD, VDDOx 2.5V Operating Voltage 2.375 2.5 2.625 V VDD, VDDOx 3.3V Operating Voltage 3.135 3.3 3.465 V IDD Supply current V DD + VDDO Outputs open; REF_IN source, XTAL_SEL = 0 130 165 mA IDD Supply current V DD + VDDO Outputs open; CRYSTAL source, XTAL_SEL = 1 145 185 mA 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 = 50Ω to VDDO − 2V Symbol Parameter Condition Min. Typ. Max. Units VOH Output High Voltage VDDO – 1.145 V DDO – 0.97 V DDO – 0.845 V VOL Output Low Voltage VDDO – 1.945 V DDO – 1.77 V DDO – 1.645 V VSWING Output Voltage Swing 0.6 0.8 1.0 V Note: 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 t he device is operated beyond the operating ratings. 3. Package thermal resistance assumes exposed pad is soldered (o r 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(s) after thermal equilibrium has been established.

Micrel, Inc. SM802108 January 2011 5 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690 LVCMOS (PLL_BYPASS, XTAL_SEL) DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol Parameter Condition Min. Typ. Max. Units VIH Input High Voltage 2 V DD + 0.3 V VIN Input Low Voltage −0.3 0.8 V IIH Input High Current V DD = VIN = 3.465V 150 μA IIL Input Low Current V DD = 3.465V, VIN = 0V −5 μA REF_IN DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol Parameter Condition Min. Typ. Max. Units VIH Input High Voltage 1.1 V DD + 0.3 V VIL Input Low Voltage −0.3 0.6 V IIN Input Current XTAL_SEL = V IL, VIN = 0V to VDD −5 5 μA IIN Input Current XTAL_SEL = V IH, VIN = VDD 20 µA Crystal Characteristics NDK NX2520SA Parameter Condition Min. Typ. Max. Units Mode of Oscillation 12pF Load F undamental, Parallel Resonant Frequency 25 MHz Equivalent Series Resistance (ESR) 50 Ω Shunt Capacitor, C0 3 7 pF Correlation Drive Level 100 300 uW

Micrel, Inc. SM802108 January 2011 6 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690 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 = 50Ω to VDDO − 2V Symbol Parameter Condition Min. Typ. Max. Units FOUT1 Output Frequency 1 156.25 MHz FOUT2 Output Frequency 2 125 Ppm Output ppm Variation Crystal reference. Note 6 −50 50 ppm FREF Reference Input Frequency 25 MHz TR/TF LVPECL Output Rise/Fall Time 20% – 80% 80 175 350 ps ODC Output Duty Cycle 48 50 52 % TSKEW Output-to-Output Skew Within bank. Note 7 45 ps TLOCK PLL Lock Time 20 ms Tjit(∅) RMS Phase Jitter(8) 156.25MHz Integration Range (1.875MHz – 20MHz) Integration Range (12kHz – 20MHz) 125MHz Integration Range (1.875MHz – 20MHz) Integration Range (12kHz – 20MHz) 110 250 110 250 fs Spurious Noise Components 6.25MHz 25MHz -73 -58 dBc Notes: 5. All phase noise measurements were taken with an Agilent 5052B phase noise system. 6. Crystal tolerance at room less than +/- 15ppm, over temp less than +/- 20ppm. 7. 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. 8. Measured using 25MHz crystal as the input reference source.

Micrel, Inc. SM802108 January 2011 7 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690 Phase Noise Plots Phase Noise Plot: 156.25MHz, 1.875MHz − 20MHz 108fS Phase Noise Plot: 156.25MHz, 12kHz − 20MHz 253fS

Micrel, Inc. SM802108 January 2011 8 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690 Phase Noise Plots (Continued) Phase Noise Plot: 125MHz, 1.875MHz − 20MHz 111fS Phase Noise Plot: 125MHz, 12kHz − 20MHz 257fS

Micrel, Inc. SM802108 January 2011 11 M9999-012111-A hbwhelp@micrel.com or (408) 955-1690

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. © 2011 Micrel, Incorporated.