DSC2311 Crystal-less™ Configurable Two Output Clock Generator General Description Features The DSC2311 is a crystal-less clock generator that is factory configurable to simultaneously output two separate frequencies from 2.3 to 170 MHz. The clock generator uses proven silicon MEMS technology to provide low jitter and high frequency stability across a wide range of supply voltages and temperatures. By eliminating the external quartz crystal, crystal-less clock generators significantly enhance reliability and accelerate product development, while meeting stringent clock performance criteria for a variety of consumer electronics, communications, and storage applications. DSC2311 has an Output Enable / Disable feature allowing it to disable the outputs when OE is low. The device is available in a space saving 6 pin 2.5 x 2.0 mm crystalless TDFN package that uses only a single external bypass capacitor. This requires a PCB footprint equivalent to that of a 1.0 x 1.0 mm crystal-based clock generator. Two Simultaneous CMOS Outputs: o Output 1 Range: 2.3 to 170 MHz o Output 2 Range: 2.3 to 170 MHz Low RMS Phase Jitter: <1 ps (typ) High Stability: ±25, ±50 ppm Wide Temperature Range o Automotive: -55° to 125° C o Ext. Industrial: -40° to 105° C o Industrial: -40° to 85° C o Ext. commercial: -20° to 70° C High Supply Noise Rejection: -50 dBc High Shock & Vibration Immunity o Qualified to MIL-STD-883 High Reliability o 20x higher MTBF than crystal-based clock generator designs Supply Range of 2.25 to 3.6 V Short Lead Times: 2 Weeks Lead Free & RoHS Compliant Applications Block Diagram Control Circuitry MEMS OE PLL Output Control and Divider Fout1 Fout2 Consumer Electronics Camera and Imaging Modules Home Automation Industrial and Power Conversion Mobile Communications, Internet, and Sensor Devices Solid State, Hard Drive, and Flash Drive Storage _____________________________________________________________________________________________________________________________ _________________ DSC2311 Page 1 MK-QB-P-D-130103-04 DSC2311 Crystal-less™ Configurable Two Output Clock Generator Specifications (Unless specified otherwise: T=25° C, VDD =3.3V) Parameter Condition Supply Voltage1 VDD Supply Current2 IDD Frequency Stability6 Δf Aging Startup Time3 Input Logic Levels Input logic high Input logic low Output Disable Time4 Δf tSU 2 Pull-Up Resistor 21 Includes frequency variations due to initial tolerance, temp. and power supply voltage 1 year @25°C T=25°C 0.75xVDD - VOH VOL f0 20% to 80% CL=15pf Output Duty Cycle Period Jitter5 SYM JPER Integrated Phase Noise JCC 1.1 1.4 Commercial/Industrial temp range Automotive temp range Max. 2.3 45 FO1=FO2=25 MHz 200kHz to 20MHz @ 25 MHz 100kHz to 20MHz @ 25 MHz 12kHz to 20MHz @ 25 MHz 3 0.3 0.38 1.7 Unit 3.6 V 23 mA ±25 ±50 ppm ±5 5 ppm ms 0.25xVDD 5 V ns 20 ns 40 0.9xVDD - I=±6mA tR tF Frequency 3. 4. 5. 6. EN pin low – outputs are disabled Pull-up exists on all digital IO Output Logic Levels Output logic high Output logic low Output Transition time4 Rise Time Fall Time Typ. 2.25 VIH VIL tDA tEN Output Enable Time Notes: 1. 2. Min. kΩ 0.1xVDD V 2 2 170 100 55 ns 2 MHz % psRMS psRMS Pin 4 VDD should be filtered with 0.01uf capacitor. Output is enabled if Enable pad is floated or not connected. Operating current = Discabled Current + ΔIDD from Fout1 + ΔIDD from Fout2. See Current Consumption graph on next page. tsu is time to 100PPM stable output frequency after VDD is applied and outputs are enabled. Output Waveform and Test Circuit figures below define the parameters. Period Jitter includes crosstalk from adjacent output. For other ppm stabilities, contact the factory at [email protected] Absolute Maximum Ratings Item Min Max Unit Supply Voltage -0.3 +4.0 V Input Voltage -0.3 VDD+0.3 V Junction Temp - +150 °C Storage Temp -55 +150 °C Soldering Temp - +260 °C ESD HBM MM CDM - Condition 40sec max. V 4000 400 1500 _____________________________________________________________________________________________________________________________ _________________ DSC2311 Page 2 MK-QB-P-D-130103-04 DSC2311 Crystal-less™ Configurable Two Output Clock Generator Current Consumption ΔIDD / Output vs. Freq & Load @ 3.3V VDD 18 16 14 ΔIDD mA 12 10 3pF 8 5pf 6 10pf 15pf 4 2 0 0 20 40 60 80 100 120 140 Fout MHz Total Current = Disabled Current + Δ IDD Fout1 + Δ IDD Fout2 Solder Reflow Profile Se ax cM 3C /Se 25°C 60-180 Sec Pre heat 8 min max Reflow a x. 150°C 60-150 Sec M ec . 3C / 217°C 200°C S 6C/ Temperature (°C) cM ax . 260°C 20-40 Sec Cool Time 6 QFN MSL 1 @ 260°C refer to JSTD-020C Ramp-Up Rate (200°C to Peak Temp) 3°C/Sec Max. Preheat Time 150°C to 200°C 60-180 Sec Time maintained above 217°C 60-150 Sec Peak Temperature 255-260°C Time within 5°C of actual Peak 20-40 Sec Ramp-Down Rate 6°C/Sec Max. Time 25°C to Peak Temperature 8 min Max. _____________________________________________________________________________________________________________________________ _________________ DSC2311 Page 3 MK-QB-P-D-130103-04 DSC2311 Crystal-less™ Configurable Two Output Clock Generator OE Function and Output Waveform: LVCMOS tR tF VOH Output VOL tEN 1/fo tDA VIH Enable VIL Package Dimensions EXTERNAL DIMENSIONS Units: mm [ inches] 2.5±0.05 [0.098±0.002] RECOMMENDED SOLDER PAD LAYOUT Units: mm [ inches] 0.7±0.1 [0.079±0.002] 0.825 [0.032] 6 5 4 4 5 Via to Power Trace 6 0.375 Via to Ground Plane 0.6 REF 0.535 REF 0.7 REF 1 2 3 0.7±0.1 [0.079±0.002] 3 2 1 0.765±0.1 6 5 4 1 2 3 2.0±0.05 [0.079±0.002] 0.65±0.05 [0.026±0.002] 0.85±0.05 0.25±0.05 [0.099±0.002] No. 1 2 3 4 5 Pin Terminal Enable N/C Ground CLK0 CLK1 6 VDD 0.85 0.65±0.05 [0.026±0.002] 0.25±0.05 [0.099±0.002] _____________________________________________________________________________________________________________________________ _________________ DSC2311 Page 4 MK-QB-P-D-130103-04 DSC2311 Crystal-less™ Configurable Two Output Clock Generator Ordering Information DSC2311 K I 2 - R0001 T Package K: 2520 QFN package Packing T: Tape & Reel : Tube Temp Range E: -20 to 70 I: -40 to 85 L: -40 to 105 M: -55 to 125 Frequency Code Rxxxx: Custom Stability 1: ±50ppm 2: ±25ppm Output Clock Frequencies Output frequencies are factory configured to individual customer and product requirements, subject to output control and divider limitations. Contact sales with your custom frequency needs. Frequency Code Fout1 MHz Fout2 MHz R0001 127 127 R0002 25 125 Disclaimer: 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. MICREL, Inc. Phone: +1 (408) 944-0800 ● ● 2180 Fortune Drive, Fax: +1 (408) 474-1000 San Jose, California 95131 ● Email: [email protected] ● ● USA www.micrel.com _____________________________________________________________________________________________________________________________ _________________ DSC2311 Page 5 MK-QB-P-D-130103-04