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| SY89645L Precision Low Skew, 1-to-4 LVCMOS/LVTTLto-LVDS Fanout Buffer General Description The SY89645L is a 3.3V, fully differential, low skew, 1:4 LVDS fanout buffer that accepts LVTTL or LVCMOS inputs. It is capable of processing clock signals as fast as 650MHz. The LVDS signals are optimized to provide less than 40ps of output skew. The single-ended input takes a 3.3V LVTTL or LVCMOS, with a signal swing as small as 1.2V. The outputs are 280mV LVDS, with fast rise and fall times, guaranteed to be less than 400ps. The SY89645L operates from a 3.3V + 5% power supply and is guaranteed over the full industrial temperature range (-40C to +85C). The SY89645L is part of Micrel's Precision Edge(R) product line. Data sheets and support documentation can be found on Micrel's web site at: www.micrel.com. Precision Edge(R) Features * * * * * * * * * * Four identical LVDS outputs CLKIN accepts LVCMOS or LVTTL input levels Maximum output frequency: 650MHz Translates LVCMOS/LVTTL input signals to LVDS levels <40ps output-to-output skew <3ns propagation delay <400ps rise/fall times 3.3V 5% operating supply Industrial temperature range: -40C to +85C Available in 20-pin TSSOP Block Diagram Applications * Communications * High-performance computing * Clock and data distribution Markets * * * * * Datacom Telecom Storage ATE Test and Measurement Precision Edge is a registered trademark of Micrel, 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 September 2006 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Ordering Information(1) Part Number SY89645LK4G SY89645LK4GTR Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. (2) Package Type K4-20-1 K4-20-1 Operating Range Industrial Industrial Package Marking SY89645LK4G with Pb-Free bar-line indicator SY89645LK4G with Pb-Free bar-line indicator Lead Finish NiPdAu Pb-Free NiPdAu Pb-Free Pin Configuration 20-Pin TSSOP (K4-20-1) Pin Description Pin Number 1, 9, 13 2 Pin Name GND CLK_EN Pin Function Power Supply Ground. Clock Enable. When LOW, Q outputs are forced low, /Q outputs are forced high. The synchronous nature of the enable function forces the output clocks to enable or disable following a rising and a falling edge of the input clock. When HIGH, clock outputs follow input clock. Internal 50k pull-up resistor. VTH = VCC/2. See "Clock Enable (CLK_EN) Description" section. No Connect. LVCMOS/LVTTL Clock Input. This is the input to the device. Input accepts singleended input signals as small as 1.2V. VTH = VCC/2. Internal 50 pull-down resistor. Positive Supply Pins. Connect to 3.3V supply, bypass with low ESR capacitors, as close to pins as possible. LVDS Differential Output Pairs: Differential buffered copies of the input signal. The output swing is typically 280mV. Normally terminated with 100 across the output pairs (Q and /Q). See "LVDS Output Termination" section. 3, 5, 6, 7, 8 4 10, 18 11, 12 14, 15 16, 17 19, 20 NC CLKIN VCC /Q3, Q3 /Q2, Q2 /Q1, Q1 /Q0, Q0 September 2006 2 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Absolute Maximum Ratings(1) Supply Voltage (VCC) ............................... -0.5V to +4.6V Input Voltage (VIN) ............................ -0.5V to VCC +0.3V LVDS Output Current (IOUT)..................................10mA Lead Temperature (soldering, 20sec.) .................. 260C Storage Temperature (Ts) ....................-65C to +150C Operating Ratings(2) Supply Voltage (VIN)...................... +3.135V to +3.465V Ambient Temperature (TA) ................... -40C to +85C Package Thermal Resistance(3) TSSOP Junction-to-Ambient (JA) Still-air, multi-layer board ................ 75C/W Junction-to-Case (JC) ........................... 21C/W DC Electrical Characteristics(4) VDD = 3.3V 5%, TA = -40C to +85C, unless otherwise stated. Symbol VCC ICC Parameter Positive Supply Voltage Range Power Supply Current No Load Condition Min 3.135 Typ 3.3 43 Max 3.465 60 Units V mA LVCMOS/LVTTL DC Electrical Characteristics(4) VCC = 3.3V 5%, TA = -40C to +85C, unless otherwise stated. Symbol VIH VIL IIH Parameter Input HIGH Voltage CLKIN, CLK_EN Input LOW Voltage CLKIN, CLK_EN Input HIGH Current CLKIN CLK_EN Input LOW Current CLKIN CLK_EN VCC = VIN = 3.465V VCC = VIN = 3.465V VCC = 3.465V, VIN = 0V VCC = 3.465V, VIN = 0V -70 -150 Condition Min 2 -0.3 Typ Max VCC+0.15 0.8 150 70 Units V V A A A A IIL LVDS Outputs DC Electrical Characteristics(4) VCC = 3.3V 5%, RL = 100 across the outputs, TA = -40C to +85C, unless otherwise stated. Symbol VOUT VDIFF_OUT VOCM VOCM Parameter Output Voltage Swing Differential Output Voltage Swing Output Common Mode Voltage Change in Common Mode Voltage Condition See Figure 1a See Figure 1b Min 200 400 1.125 Typ 280 560 1.25 5 1.375 25 Max Units mV mV V mV 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 ratings 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. JB and JA values are determined for a 4-layer board in still-air number, unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. September 2006 3 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L AC Electrical Characteristics(5) VCC = +3.3V 5%, RL = 100 across the outputs, TA = -40C to +85C, unless otherwise stated. Symbol fMAX tPD tSKEW tr, tf Parameter Maximum Frequency Propagation Delay Output Skew Part-to-Part Skew Output Rise/Fall Times (20% to 80%) Duty Cycle Notes: 5. 6. 7. 8. All parameters measured at fMAX 650MHz, unless otherwise stated. Measured from VCC/2 of the input to the differential output crossing point. Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VCC/2 of the input to the differential output crossing point. Defined as skew between outputs on different devices operating at the same supply voltages and with equal load conditions. Using the same type of inputs on each device, the outputs are measured at the differential cross points. Condition VOUT > 140mV fMAX 650MHz, Note 6 Note 7 Note 8 fMAX 266MHz fMAX 266MHz fMAX > 266MHz Min 650 1.0 Typ 1.8 Max 3.0 40 500 Units MHz ns ps ps ps % % 150 45 40 250 400 55 60 Timing Diagram Clock Enable (CLK_EN) Description The enable function is synchronous so that the clock outputs will be enabled or disabled following a rising and a falling edge of the input clock. September 2006 4 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Typical Operating Characteristics VCC = 3.3V 5%; VIN > 2V; TA = 25C, RL = 100 across output pair; unless otherwise stated. September 2006 5 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Single-Ended and Differential Swings LVDS Output Interface Applications LVDS specifies a small swing of 280mV 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 kept to a minimum, to keep EMI low. Figure 1a. Single-Ended Voltage Swing Figure 1b. Differential Voltage Swing Figure 2a. LVDS Differential Measurement Figure 2b. LVDS Common Mode Measurement September 2006 6 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SY89645L Package Information 20-Pin TSSOP (K4-20-1) 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 data sheet 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 a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2006 Micrel, Incorporated. September 2006 7 M9999-091906-A hbwhelp@micrel.com or (408) 955-1690 |
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