SY898530U 500MHz 1:16 3.3V-to-2.5/3.3V LVPECL Fanout Buffer General Description Features The SY898530U is a 1:16 Fanout buffer which can accept most standard differential logic levels and outputs the signal as a differential 2.5V or 3.3V LVPECL signal. The part can amplify input signals as small as 150mVpp to the full LVPECL output swing. The SY898530U is well suited for clock distribution applications which demand versatility and low-skew performance. It is pin-to-pin compatible with IDT’s ICS8530 fanout buffer. The SY898530U operates from a 3.3V ±5% core power supply and a 2.5V ±5% or a 3.3V ±5% output supply. The SY898530U is guaranteed over the full commercial temperature range (0°C to +70°C). It is available in a 48pin TQFP lead-free package. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. 16 Differential 2.5V/3.3V LVPECL outputs Differential CLK inputs. Accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL logic levels Translates any single-ended input signal to 2.5/3.3V LVPECL levels with a resistor bias on /CLK input 500MHz maximum output frequency <50ps output skew <250ps part-to-part skew <2ns propagation delay 3.3V Core, 2.5/3.3V output operating supply 0°C to +70°C operating temperature Available in 48-pin TQFP package Pin-to-pin compatible with ICS8530 Functional Block Diagram Applications Data distribution High-performance PCs Communications Parallel processor-based systems 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 November 2011 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Ordering Information(1) Part Number Package Type Operating Range Package Marking Lead Finish TQFP-48 Commercial SY898530UTZ with Pb-Free bar-line indicator Matte-Sn (2) TQFP-48 Commercial SY898530UTZ with Pb-Free bar-line indicator Matte-Sn (2, 3) TQFP-48 Commercial SY898530UTZ with Pb-Free bar-line indicator Matte-Sn SY898530UTZ SY898530UTZTR SY898530UTZTX Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only. 2. Tape and Reel. 3. EIA specification orientation. Pin Configuration 48-Pin TQFP (TQFP-48) November 2011 2 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Pin Description Pin Number Pin Name Pin Function 36, 37 CLK, /CLK Differential Clock Inputs. Accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL logic levels. CLK is internally connected to a pull-down resistor, /CLK is internally connected to a pullup resistor. See “Pin Characteristics” for typical values. 33, 34 Q0, /Q0 31, 32 Q1, /Q1 28, 29 Q2, /Q2 26, 27 Q3, /Q3 22, 23 Q4, /Q4 20, 21 Q5, /Q5 17, 18 Q6, /Q6 15, 16 Q7, /Q7 9, 10 Q8, /Q8 7, 8 Q9, /Q9 4, 5 Q10, /Q10 2, 3 Q11, /Q11 46, 47 Q12, /Q12 44, 45 Q13, /Q13 41, 42 Q14, /Q14 39, 40 Q15, /Q15 1, 11, 14, 24, LVPECL Differential Output Pairs. Differential buffered copies of the input signal. The output swing is typically 740mV. See Interface Applications for termination information. Output Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCCO pins as possible. Supplies the output buffers. VCCO 25, 35, 38, 48 12, 13 VCC Core Power Supply: Bypass with 0.1µF//0.01µF low ESR capacitors as close to the VCC pins as possible. Supplies input and core circuitry. 6, 19, 30, 43 VEE Ground Pin Characteristics Symbol Description Min. Typ. Max. Units CIN Input Capacitance 4 pF RPULLUP Input Pull Up Resistor 50 KΩ RPULLDOWN Input Pull Down Resistor 30 KΩ Clock Input Function Table Inputs Outputs CLK /CLK 0 1 0 1 Input to Output Mode Polarity Qx /Qx 1 Low High Differential to Differential Non-Inverting 0 High Low Differential to Differential Non-Inverting Biased(1) Low High Single-Ended to Differential Non-Inverting (1) High Low Single-Ended to Differential Non-Inverting Biased (1) Biased 0 High Low Single-Ended to Differential Inverting Biased(1) 1 Low High Single-Ended to Differential Inverting Note: 1. Refer to Interface Applications for Single-Ended Interfaces. November 2011 3 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC)................................................4.6V Input Voltage (VIN) ............................–0.5V to VCC + 0.5V LVPECL Output Current (IOUT) Continuous.......................................................50mA Surge .............................................................100mA Lead Temperature (soldering, 20sec.).................. 260°C Storage Temperature (Ts) ....................–65°C to +150°C Supply Voltage (VCC) ......................... 3.135V to 3.465V Output Supply Voltage (VCCO)............ 2.375V to 3.465V Ambient Temperature (TA)........................0°C to +70°C Package Thermal Resistance(3) TQFP Still-air (JA) .........................................48°C/W Junction-to-Case (JC).........................13°C/W DC Electrical Characteristics(6) VCC = 3.135V to 3.465V, VCCO = 2.375V to 3.465V, TA = 0°C to +70°C, unless otherwise stated. Symbol Parameter Min. Typ. Max. Units VCC Power Supply Voltage Range Condition 3.135 3.3 3.465 V VCCO Output Power Supply 2.375 3.465 V IEE Power Supply Current 125 mA IIH Input HIGH Current IIL Input LOW Current VPP Peak-to-Peak Input Swing VCMR Common Mode Input Voltage Max. VCC, VCCO CLK /CLK CLK /CLK VCC = VIN = 3.465V VCC = 3.465V, VIN = 0.5V Note 4, 5 150 uA 5 uA 5 uA 150 uA 0.15 1.3 V 0.5 Vcc 0.85 V PECL Outputs DC Electrical Characteristics(6) VCC = 3.135V to 3.465V, VCCO = 2.375V to 3.465V, TA = 0°C to +70°C, Outputs terminated with 50Ω to VCCO-2V unless otherwise stated. Symbol Parameter VOH Output HIGH Voltage VOL VOUT Condition Min. Typ. Max. Units VCCO 1.1 VCCO 0.7 V Output LOW Voltage VCCO 2.0 VCCO 1.4 V Output Voltage Swing 0.55 0.93 V 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. JA and JC values are determined for a 4-layer board in still-air. 4. For single-ended applications, the maximum input voltage for CLK, /CLK is VCC+0.3V. 5. Common mode voltage is defined as VIH. 6. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. November 2011 4 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U AC Electrical Characteristics VCC = 3.135V to 3.465V, VCCO = 2.375V to 3.465V, TA = 0°C to +70°C, unless otherwise stated. Symbol Parameter Condition Min. fMAX Maximum Frequency tPD Propagation Delay Note 7 Output-to-Output skew Note 8, 10 Part-to-Part Skew Notes 9, 10 tJITTER Integration Range = 12kHz 20MHz Output = 500MHz tR, tF Output Rise/Fall Times (20% to 80%) At full output swing. tSkew Typ. Max. 500 MHz 1 26 Duty Cycle 2 ns 50 ps 250 ps fsRMS 127 300 47 Units 50 700 ps 53 % Notes: 7. Measured from the differential input crossing point to the differential output crossing point. 8. Output-to-Output skew is the difference in time between outputs, receiving data from the same input, for the same temperature, voltage and transition. 9. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective inputs. 10. This parameter is defined in accordance with JEDEC Standard 65. November 2011 5 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Phase Noise Graph Phase Noise Plot: 500MHz @ 3.3V November 2011 6 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Test Circuit Differential Input Level Output Duty Cycle Propagation Delay Output Rise/Fall Times Output-to-Output Skew Part-to-Part Skew November 2011 7 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Typical Characteristics VCC = 3.3V, VCCO = 2.5V or 3.3V, TA = 25°C, Input Signal = 800mV November 2011 8 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Junction Temperature The maximum recommended junction temperature is TJ =125°C. The outputs are terminated with 50 ohms to Vcco - 2V. Below is a calculation of the worst case scenario with zero airflow: TJ= Junction Temperature TA = Ambient Temperature ΘJA = Junction-to-Ambient Thermal Resistance Pd = Power Dissipation Pd = Pd_core + Pd_outputs Pd_core = Vcc_max * Iee_max Pd_core = 3.465V * 125mA = 433mW Pd_output = Pd_h + Pd_l Pd_h = [(Voh – (Vcco – 2V))/RL] * (Vcco - Voh_max) Pd_h = [(2V – 0.7V)/50Ω] * 0.7V Pd_h = 18.2mW Pd_l = [(Vol – (Vcco – 2V))/RL] * (Vcco - Vol_max) Pd_l = [(2V – 1.4V)/50Ω] * 1.4V Pd_l = 16.8mW Pd_output = 35mW Pd_outputs = 16 * 35mW Pd_outputs = 560mW Pd = 433mW + 560mW Pd = 0.993 W TJ = TA + ΘJA * Pd TJ_worst_case = 70°C + 0.993W * 48°C/W TJ_worst_case = 118 °C in still air. The worst case junction temperature is below 125 C. November 2011 9 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Output Interface Applications Figure 1. Parallel Termination-Thevenin Equivalent Notes: 1. For +2.5V systems: R1 = 250Ω, R2 = 82.5Ω. Figure 2. Three-Resistor “Y-Termination” Notes: 1. Power-saving alternatives to Thevenin termination. 2. Place termination resistors as close to destination inputs as possible. 3. For +2.5V systems, Rb = 19Ω. Rb resistor sets the DC bias voltage, equal to Vt. Figure 3. Terminating Unused I/O Notes: 1. Unused output (/Q) must be terminated to balance the output. 2. For 2.5V systems: R1 = 250Ω, R2 = 62.5Ω, R3 = 1.25kΩ, R4 = 1.2kΩ. November 2011 10 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Input Interface Applications Figure 4. CLK and /CLK Input Driven By 1.8V LVHSTL Figure 5. CLK and /CLK Input Driven By 3.3V LVDS Driver Figure 6. CLK and /CLK Input Driven By 3.3V LVPECL Driver with AC Couple Notes: 1. For +2.5V systems: R5 = 50 Ω. R1 & R2 = 220Ω, R3 & R4 = 68Ω. November 2011 11 M9999-111011-C [email protected] or (408) 955-1690 Micrel, Inc. SY898530U Package Information 48-Pin TQFP (TQFP-48) 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. November 2011 © 2011 Micrel, 12 Incorporated. M9999-111011-C [email protected] or (408) 955-1690