SY898535XL Precision Differential 3.3V, Low Skew, 1:4 Crystal Oscillator/LVCMOS/LVTTL -toLVPECL Fanout Buffer General Description Features The SY898535XL is a 3.3V, low skew, 1:4 Crystal Oscillator/LVCMOS/LVTTL-to-LVPECL fanout buffer with selectable single ended clock or crystal inputs. The clock input accepts LVCMOS or LVTTL input levels and translate them to 3.3V LVPECL levels. To eliminate runt pulses on the outputs during asynchronous assertion/deassertion of the clock enable pin, the clock enable is synchronized with the input signal. The SY898535XL operates from a 3.3V ±5% supply and is guaranteed over the full industrial temperature range of –40°C to +85°C. The SY898535XL is part of Micrel’s high® speed, Precision Edge product line. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • • • • Provides four differential 3.3V LVPECL copies Selects between single-ended CLK or crystal inputs CLK accepts LVCMOS or LVTTL input levels Guaranteed AC performance over temperature and supply voltage: 235MHz Maximum output frequency <1.65ns Propagation delay (In-to-Q) <30ps Output skew <200ps Part-to-part skew Additive phase jitter, RMS: 0.09ps (typical) • 3.3V ±5% supply voltage • –40°C to +85°C industrial temperature operating range • Available in a 20-pin TSSOP package Functional Block Diagram Applications • • • • Gigabit Ethernet 10Gigabit Ethernet SONET/SDH PCI Markets • • • • LAN/WAN Enterprise servers 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 June 2011 M9999-062211-B [email protected] or (408) 955-1690 Micrel, Inc. SY898535XL Ordering Information(1) Part Number SY898535XLKY SY898535XLKYTR (2) Package Type Operating Range Package Marking K4-20-1 Industrial 898535XL with Pb-Free Bar-Line Indicator K4-20-1 Industrial 898535XL with Pb-Free Bar-Line Indicator Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals Only. 2. Tape and Reel. Truth Table CLK_EN 0 0 1 1 June 2011 Inputs CLK_SEL 0 1 0 1 Outputs Selected Source CLK XTAL CLK XTAL Q0:Q3 Disabled: LOW Disabled: LOW Enabled Enabled 2 /Q0:/Q3 Disabled: HIGH Disabled: HIGH Enabled Enabled M9999-062211-B [email protected] or (408) 955-1690 Micrel, Inc. SY898535XL Pin Configuration 20-Pin TSSOP (K4-20-1) Pin Description Pin Number Pin Name 1 VEE Pin Function Ground. CLK_EN Single-Ended Input: This TTL/CMOS input disables and enables the Q0-Q3 outputs. It is internally connected to a 51kΩ pull-up resistor and will default to a logic HIGH state if left open. When disabled, Q goes LOW and /Q goes HIGH. CLK_EN being synchronous, outputs will be enabled/disabled following a rising and a falling edge of the input clock. VTH = is approximately 1.5V. 3 CLK_SEL Single-Ended Input: This single-ended TTL/CMOS-compatible input selects the input to the multiplexer. If HIGH, selects XTAL input. If LOW, it selects CLK input. Note that this input is internally connected to a 51kΩ pull-down resistor and will default to logic LOW state if left open. VTH = is approximately 1.5V. 4 CLK Single-Ended Input: This LVCMOS or LVTTL signal is the input signal to the device. It is internally connected to a 51kΩ pull-down resistor and will default to a logic LOW state if left open. This input is selected when CLK_SEL is set to logic LOW. 6, 7 XTAL_IN, XTAL_OUT 5, 8, 9 NC 10, 13, 18 VCC Positive Power Supply Pins: Bypass with 0.1µF||0.01µF low ESR capacitors as close to the VCC pins as possible. 20, 19 17, 16 15, 14 12, 11 Q0, /Q0 Q1, /Q1 Q2, /Q2 Q3, /Q3 LVPECL Differential Output Pairs: Differential buffered output copies the selected input signal. The output swing is typically 800mV. Unused output pairs may be left floating with no impact on jitter. See “Truth Table” below. 2 June 2011 Crystal oscillator interface. XTAL_IN is the input. XTAL_OUT is the output. Unused Pins 3 M9999-062211-B [email protected] or (408) 955-1690 Micrel, Inc. SY898535XL Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VCC).................................... –0.5V to +4.6V Input Voltage (VIN) ..................................–0.5V to VCC +0.5V LVPECL Output Current (IOUT) ............................................. Continuous............................................................50mA Surge ..................................................................100mA Lead Temperature (soldering, 20 sec.).................... +260°C Storage Temperature (Ts) ........................... –65°C to 150°C Supply Voltage (VCC)............................ +3.135V to +3.465V Ambient Temperature (TA) ...........................-40°C to +85°C (3) Package Thermal Resistance TSSOP (θ JA) Still-Air......................................................73.2°C/W Power Supply DC Electrical Characteristics(4) VCC = 3.3V ±5%; TA = -40°C to +85°C, unless otherwise stated. Symbol Parameter Condition VCC Power Supply IEE Power Supply Current Min Typ Max Units 3.135 3.3 3.465 V 60 mA No load, max VCC LVCMOS/LVTTL DC Electrical Characteristics(4) VCC = 3.3V ±5%; TA = -40°C to +85°C, unless otherwise stated. Symbol Parameter VIH Input High Voltage VIL Input Low Voltage IIH Input High Current IIL Condition Min Typ 2 Max Units VCC + 0.3V V -0.3 Input Low Current 0.8 V CLK, CLK_SEL VIN = VCC = 3.465V 150 µA CLK_EN VIN = VCC = 3.465V 5 µA CLK, CLK_SEL VIN = 0V, VCC = 3.465V -5 µA CLK_EN VIN = 0V, VCC = 3.465V -150 µA LVPECL DC Electrical Characteristics(4) VCC = 3.3V ±5%; TA = -40°C to +85°C, unless otherwise stated. Symbol VOH Parameter Condition Min (5) Output High Voltage (5) VOL Output Low Voltage VSWING Peak-to-Peak Output Voltage Swing Typ Max Units VCC - 1.4 VCC – 0.9 V VCC – 2.0 VCC - 1.7 V 0.6 1.0 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 rating 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. θJA value is determined for a 4-layer board in still air unless otherwise stated. 4. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 5. 50Ω to VCC-2V terminated outputs. June 2011 4 M9999-062211-B [email protected] or (408) 955-1690 Micrel, Inc. SY898535XL Crystal Characteristics Parameter Condition Min. Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitor, C0 Correlation Drive Level Typ. Fundamental 25 12 Max. Units 40 50 7 1 MHz Ω pF mW AC Electrical Characteristics(6) VCC = 3.3V ±5%; RL = 50Ω to VCC-2V; TA = -40°C to +85°C, unless otherwise stated. Symbol Parameter fMAX Maximum Operating Frequency Condition Min (7) tPD Propagation Delay tJITTER Additive Phase Jitter Typ 1.40 155.52MHz, Max Units 235 MHz 1.75 ns 0.057 psRMS 30 ps (Integration Range: 12kHz-20MHz) tSKEW Output-to-Output Skew(8) (9) Part-to-Part Skew tr, tf Output Rise/Fall Time odc Output Duty Cycle 20% to 80% 300 46 50 200 ps 600 ps 54 % Notes: 6. High-frequency AC-parameters are guaranteed by design and characterization. 7. Measured from VCC/2 of the input to the differential output crossing point. 8. Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at the output differential cross points. 9. 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. June 2011 5 M9999-062211-B [email protected] or (408) 955-1690 Micrel, Inc. SY898535XL Timing Diagrams Figure 1a. CLK_EN Timing Diagram Figure 1b. Propagation Delay Figure 1c. Output-to-Output Skew June 2011 6 M9999-062211-B [email protected] or (408) 955-1690 Micrel, Inc. SY898535XL 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 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. June 2011 7 M9999-062211-B [email protected] or (408) 955-1690