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| Micrel, Inc. 2.5V, 2.0GHz ANY DIFF. IN-TO-LVDS SY89875U Precision Edge(R) PROGRAMMABLE CLOCK DIVIDER AND 1:2 SY89875U FANOUT BUFFER W/ INTERNAL TERMINATION Precision Edge(R) FEATURES Integrated programmable clock divider and 1:2 fanout buffer Guaranteed AC performance over temperature and voltage: * > 2.0GHz fMAX * < 200ps tr/tf * < 15ps within device skew Low jitter design: * < 10psPP total jitter * < 1psRMS cycle-to-cycle jitter Unique input termination and VT Pin for DC-coupled and AC-coupled Inputs; CML, PECL, LVDS and HSTL LVDS compatible outputs TTL/CMOS inputs for select and reset Parallel programming capability Programmable divider ratios of 1, 2, 4, 8 and 16 Low voltage operation 2.5V Output disable function -40C to 85C temperature range Available in 16-pin (3mm x 3mm) MLF(R) package DESCRIPTION This low-skew, low-jitter device is capable of accepting a high-speed (e.g., 622MHz or higher) CML, LVPECL, LVDS or HSTL clock input signal and dividing down the frequency using a programmable divider to create a lower speed version of the input clock. Available divider ratios are 2, 4, 8 and 16, or straight pass-through. The differential input buffer has a unique internal termination design that allows access to the termination network through a VT pin. This feature allows the device to easily interface to different logic standards. A VREF-AC reference is included for AC-coupled applications. The /RESET input asynchronously resets the divider. In the pass-through function (divide by 1) the /RESET synchronously enables or disables the outputs on the next falling edge of IN (rising edge of /IN). TYPICAL PERFORMANCE OC-12 to OC-3 Translator/Divider APPLICATIONS SONET/SDH line cards Transponders High-end, multiprocessor servers FUNCTIONAL BLOCK DIAGRAM S2 CML/LVPECL/LVDS 622MHz Clock In Divide-by-4 LVDS 155.5MHz Clock Out /RESET Enable FF 622MHz In IN Enable MUX Q0 /Q0 MUX IN 509 VT 509 /IN Divided by 2, 4, 8 or 16 Q1 /IN Q0 /Q1 155.5MHz Out S1 Decoder S0 /Q0 VREF_AC Precision Edge is a registered trademark of Micrel, Inc. MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc. M9999-020707 hbwhelp@micrel.com or (408) 955-1690 Rev.: C Amendment: /0 1 Issue Date: February 2007 Micrel, Inc. Precision Edge(R) SY89875U PACKAGE/ORDERING INFORMATION GND VCC S0 S1 Ordering Information(1) Part Number 12 11 10 9 16 15 14 13 Package Operating Type Range MLF-16 MLF-16 MLF-16 MLF-16 Industrial Industrial Industrial Industrial Package Marking 875U 875U 875U with Pb-Free bar line indicator 875U with Pb-Free bar line indicator Lead Finish Sn-Pb Sn-Pb NiPdAu Pb-Free NiPdAu Pb-Free Q0 /Q0 Q1 /Q1 1 2 3 4 5 6 7 8 IN VT VREF-AC /IN SY89875UMI SY89875UMITR(2) SY89875UMG(3) SY89875UMGTR(2, 3) NC S2 /RESET VCC 16-Pin MLF(R) (MLF-16) Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. 3. Pb-Free package is recommended for new designs. PIN DESCRIPTION Pin Number 12, 9 1, 2, 3, 4 16, 15, 5 6 8 Pin Name IN, /IN Q0, /Q0 Q1, /Q1 S0, S1, S2 NC /RESET, /DISABLE Pin Function Differential Input: Internal 50 termination resistors to VT input. Flexible input accepts any differential input. See "Input Interface Applications" section. Differential Buffered LVDS Outputs: Divided by 1, 2, 4, 8 or 16. See "Truth Table." Unused output pairs must be terminated with 100 across the different pair. Select Pins: See "Truth Table." LVTTL/CMOS logic levels. Internal 25k pull-up resistor. Logic HIGH if left unconnected (divided by 16 mode.) Input threshold is VCC/2. No Connect. LVTTL/CMOS Logic Levels: Internal 25k pull-up resistor. Logic HIGH if left unconnected. Apply LOW to reset the divider (divided by 2, 4, 8 or 16 mode). Also acts as a disable/enable function. The reset and disable function occurs on the next high-to-low clock input transition. Input threshold is VCC/2. Reference Voltage: Equal to VCC-1.4V (approx.). Used for AC-coupled applications only. Decouple the VREF-AC pin with a 0.01F capacitor. See "Input Interface Applications" section. Termination Center-Tap: For CML or LVDS inputs, leave this pin floating. Otherwise, See Figures 4a to 4f, "Input Interface Applications" section. Positive Power Supply: Bypass with 0.1F//0.01F low ESR capacitor. Ground. Exposed pad must be connected to the same potential as the GND pin. 10 11 7, 14 13 VREF-AC VT VCC GND Exposed TRUTH TABLE /RESET(1) 1 1 1 1 1 0(1) Note 1. S2 0 1 1 1 1 X S1 X 0 0 1 1 X S0 X 0 1 0 1 X Outputs Reference Clock (pass through) Reference Clock /2 Reference Clock /4 Reference Clock /8 Reference Clock /16 Q = LOW, /Q = HIGH Clock Disable Reset/Disable function is asserted on the next clock input (IN, /IN) high-to-low transition. M9999-020707 hbwhelp@micrel.com or (408) 955-1690 2 Micrel, Inc. Precision Edge(R) SY89875U Absolute Maximum Ratings(Note 1) Supply Voltage (VCC) .................................. -0.5V to +4.0V Input Voltage (VIN) .................................. -0.5V to VCC+0.3 ECL Output Current (IOUT) Continuous ......................................................... 50mA Surge ................................................................ 100mA Input Current IN, /IN (IIN) .......................................... 50mA VT Current (IVT) ...................................................... 100mA VREF-AC Sink/Source Current (IVREF-AC), Note 3 ....... 2mA Lead Temperature (soldering 20 sec.) ...................... 260C Storage Temperature (TS) ....................... -65C to +150C Note 1. Operating Ratings(Note 2) Supply Voltage (VCC) ........................................ +2.5V 5% Ambient Temperature (TA) ......................... -40C to +85C Package Thermal Resistance MLF(R) (JA) Still-Air ............................................................. 60C/W 500lfpm ............................................................ 54C/W MLF(R) (JB), Note 4 Junction-to-Board ............................................ 32C/W Note 2. Note 3. Note 4. 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 ratlng conditions for extended periods may affect device reliability. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. Due to the limited drive capability use for input of the same package only. Junction-to-board resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the pcb. DC ELECTRICAL CHARACTERISTICS(Notes 1, 2) TA= -40C to +85C; Unless otherwise stated. Symbol VCC ICC RIN VIH VIL VIN VDIFF_IN |IIN| VREF-AC Note 1. Note 2. Note 3. Note 4. Note 5. Note 6. Parameter Power Supply Power Supply Current Differential Input Resistance (IN-to-/IN) Input High Voltage (IN, /IN) Input Low Voltage (IN, /IN) Input Voltage Swing Differential Input Voltage Swing Input Current (IN, /IN) Reference Voltage Condition Min 2.375 Typ Max 2.625 Units V mA V V V V No load, max. VCC 90 Note 3 Note 3 Note 4 Note 5 Note 3 Note 6 0.1 - 0.1 -0.3 70 100 - - - - - 95 110 VCC+0.3 VCC+0.2 1.8 45 mA V VCC-1.525 VCC-1.425 VCC-1.325 The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Specification for packaged product only. Due to the internal termination (see Figure 2a) the input current depends on the applied voltages at IN, /IN and VT inputs. Do not apply a combination of voltages that causes the input current to exceed the maximum limit! See "Timing Diagram" for VIN definition. VIN (Max) is specified when VT is floating. See "Typical Operating Characteristics" section for VDIFF definition. Operating using VIN is limited to AC-coupled PECL or CML applications only. Connect directly to VT pin. M9999-020707 hbwhelp@micrel.com or (408) 955-1690 3 Micrel, Inc. Precision Edge(R) SY89875U LVDS DC ELECTRICAL CHARACTERISTICS(Notes 1, 2) VCC = 2.5V 5%; TA = -40C to +85C; Unless otherwise stated. Symbol VOUT VOH VOL VOCM VOCM Note 1. Note 2. Note 3. Note 4. Parameter Output Voltage Swing Output High Voltage Output Low Voltage Output Common Mode Voltage Change in Common Mode Voltage Condition Note 3, 4 Note 3 Note 3 Note 4 Min 250 Typ 350 Max 400 1.475 Units mV V V 0.925 1.125 -50 1.375 50 V mV The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Specification for packaged product only. Measured as per Figure 2a, 100 across Q and /Q outputs. Measured as per Figure 2b. LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(Notes 1, 2) VCC = 2.5V 5%; TA = -40C to +85C; Unless otherwise stated. Symbol VIH VIL IIH IIL Note 1. Note 2. Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Condition Min 2.0 Typ Max Units V 0.8 -125 20 -300 V A A The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Specification for packaged product only. M9999-020707 hbwhelp@micrel.com or (408) 955-1690 4 Micrel, Inc. Precision Edge(R) SY89875U AC ELECTRICAL CHARACTERISTICS(Notes 1, 2) VCC = 2.5V 5%; TA = -40C to +85C; Unless otherwise stated. Symbol fMAX tPD tSKEW tRR tJITTER tr,tf Note 1. Note 2. Note 3. Note 4. Note 5. Note 6. Parameter Maximum Input Frequency Differential Propagation Delay IN to Q Within-Device Skew (diff.) Part-to-Part Skew (diff.) Reset Recovery Time Cycle-to-Cycle Jitter Total Jitter Rise/Fall Time (20% to 80%) Condition Output Swing 200mV Input Swing < 400mV Input Swing 400mV Note 3 Note 3 Note 4 Note 5 Note 6 Min 2.0 590 540 Typ 2.5 690 690 5 Max Units GHz 870 820 15 280 ps ps ps ps ps 600 1 10 70 120 200 psRMS psPP ps Measured with 400mV input signal, 50% duty cycle, all outputs loaded with 100 across each output pair, unless otherwise stated. Specification for packaged product only. Skew is measured between outputs under identical transitions. See "Timing Diagram." Cycle-to-cycle jitter definition: the variation in period between adjacent cycles over a random sample of adjacent cycle pairs. Tjitter_cc = Tn-Tn+1, where T is the time between rising edges of the output signal. Total jitter definition: with an ideal clock input of frequency fMAX, no more than one output edge in 1012 output edges will deviate by more than the specified peak-to-peak jitter value. TIMING DIAGRAM /RESET VCC/2 tRR IN VID /IN VIN Swing /Q VOUT Swing Q tPD M9999-020707 hbwhelp@micrel.com or (408) 955-1690 5 Micrel, Inc. Precision Edge(R) SY89875U TYPICAL OPERATING CHARACTERISTICS VCC = 2.5V, TA = 25C, unless otherwise stated. 350 300 AMPLITUDE (mV) 250 200 150 100 50 0 0 Output Amplitude vs. Frequency PROPAGATION DELAY (ps) 500 100015002000250030003500 FREQUENCY (MHz) 800 750 700 650 600 550 IN to Q Propagation Delay vs. Input Swing 500 0 200 400 600 800 1000 INPUT SWING (mV) 800 PROPAGATION DELAY (ps) 750 700 650 600 550 IN to Q Propagation Delay vs. Temperature OUTPUT DUTY CYCLE (mV) 60 Output Duty Cycle vs. Frequency 55 50 45 500 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) 40 0 500 1000 1500 2000 2500 3000 FREQUENCY (MHz) M9999-020707 hbwhelp@micrel.com or (408) 955-1690 6 Micrel, Inc. Precision Edge(R) SY89875U TYPICAL OPERATING CHARACTERISTICS (Continued) VCC = 2.5V, TA = 25C, unless otherwise stated. 622MHz Output 1.25GHz Output Output Swing (50mV/div.) TIME (300ps/div.) Output Swing (50mV/div.) TIME (140ps/div.) 2.5GHz Output Output Swing (50mV/div.) TIME (80ps/div.) DEFINITION OF SINGLE-ENDED AND DIFFERENTIAL SWINGS VIN, VOUT 350mV (typical) VDIFF_IN, VDIFF_OUT 700mV (typical) Figure 1a. Single-Ended Swing Figure 1b. Differential Swing M9999-020707 hbwhelp@micrel.com or (408) 955-1690 7 Micrel, Inc. Precision Edge(R) SY89875U INPUT INTERFACE APPLICATIONS VCC VCC 1.86k 1.86k 25k S0 S1 S2 /RESET R 1.86k IN 50 VT 50 /IN GND 1.86k R GND Figure 2a. Simplified Differential Input Buffer Figure 2b. Simplified TTL/CMOS Input Buffer LVDS OUTPUTS LVDS (Low Voltage Differential Swing) specifies a small swing of 350mV typical, on a nominal 1.25V common mode above ground. The common mode voltage has tight limits to permit large variations in ground between an LVDS driver and receiver. Also, change in common mode voltage, as a function of data input, is also kept tight, to keep EMI low. vOD vOH, vOL vOH, vOL 50 100 50 vOCM, vOCM GND GND Figure 3a. LVDS Differential Measurement Figure 3b. LVDS Common Mode Measurement M9999-020707 hbwhelp@micrel.com or (408) 955-1690 8 Micrel, Inc. Precision Edge(R) SY89875U INPUT INTERFACE APPLICATIONS VCC VCC VCC CML IN VCC VCC VCC IN IN CML /IN SY89875U GND NC NC VT VREF_AC PECL /IN SY89875U /IN VT 5;&'&%#7 GND 0.01F VCC -2V 39 NC GND VT VREF_AC VCC 0.01F VREF_AC VCC Figure 4a. DC-Coupled CML Input Interface Figure 4b. AC-Coupled CML Input Interface Figure 4c. DC-Coupled PECL Input Interface VCC IN /IN 509 VCC GND GND 0.01F VT VCC VCC IN LVDS VCC VCC HSTL IN VCC PECL 509 5;&'&%#7 GND NC NC /IN /IN VT NC 5;&'&%#7 VT VREF_AC 5;&'&%#7 GND GND VREF_AC VREF_AC Figure 4d. AC-Coupled CML Input Interface Figure 4e. LVDS Input Interface Figure 4f. HSTL Input Interface RELATED PRODUCT AND SUPPORT DOCUMENTATION Part Number SY89872U Function 2.5V, 2.5GHz Any Diff. In-to-LVDS Programmable Clock Divider/Fanout Buffer w/ Internal Termination MLF(R) Application Note HBW Solutions New Products and Applications Data Sheet Link http://www.micrel.com/product-info/products/sy89872u.shtml http://www.amkor.com/products/notes_papers/mlf_appnote_0902.pdf http://www.micrel.com/product-info/products/solutions.shtml M9999-020707 hbwhelp@micrel.com or (408) 955-1690 9 Micrel, Inc. Precision Edge(R) SY89875U 16-PIN MicroLeadFrame(R) (MLF-16) Package EP- Exposed Pad Die CompSide Island Heat Dissipation Heat Dissipation VEE Heavy Copper Plane VEE Heavy Copper Plane PCB Thermal Consideration for 16-Pin MLF(R) Package (Always solder, or equivalent, the exposed pad to the PCB) Package Notes: Note 1. Note 2. Package meets Level 2 moisture sensitivity classification, and are shipped in dry-pack form. Exposed pads must be soldered to a ground for proper thermal management. 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 The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. 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 at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M9999-020707 hbwhelp@micrel.com or (408) 955-1690 10 |
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