1:6 CML FANOUT BUFFER

Micrel 6GHz, 1:6 CML FANOUT BUFFER w/ 2:1 MUX INPUT AND INTERNAL I/O TERMINATION Precision Edge™ SY58034U Precision Edge™ SY58034U FEATURES s Provides six (6) ultra-low skew copies of the selected input Precision Edge™ s 2:1 MUX input included for clock switchover applications DESCRIPTION s Guaranteed AC performance over temperature and voltage: The SY58034U is a 2.5V/3.3V precision, high-speed 1:6 • Clock frequency range: DC to > 6GHz fanout buffer capable of handling clocks up to 6GHz. A • < 290ps IN-to-OUT tpd differential 2:1 MUX input is included for redundant clock • < 60ps tr / tf times switchover applications. • < 20ps skew (output-to-output) The differential input includes Micrel’s unique, 3-pin input s Ultra low-jitter design: termination architecture that allows the device to interface • < 1psrms random jitter to any differential signal (AC- or DC-coupled) as small as • < 10pspp total jitter (clock) 100mV without any level shifting or termination resistor • < 1psrms cycle-to-cycle jitter networks in the signal path. The outputs are 50Ω source • < 0.7psrms crosstalk-induced jitter terminated CML, with extremely fast rise/fall times guaranteed to be less than 60ps. s Low supply voltage operation: 2.5V and 3.3V The SY58034U operates from a 2.5V ±5% supply or a s Unique input termination and VT pin accepts DC3.3V ±10% supply and is guaranteed over the full industrial coupled and AC-coupled inputs (CML, PECL, LVDS) temperature range of –40°C to +85°C. For applications that s Unique input isolation design minimizes crosstalk require LVPECL outputs, consider the SY58035U or s Internal 50Ω output source termination www.DataSheet4U.com SY58036U Multiplexers. The SY58034U is part of Micrel’s s 400mV CML output swing (RL = 50Ω) high-speed, Precision Edge™ product line. s –40°C to +85°C temperature range All support documentation can be found on Micrel’s web site at www.micrel.com. s Available in 32-pin (5mm × 5mm) MLF™ package APPLICATIONS s s s s Redundant clock distribution All SONET/SDH clock distribution All Fibre Channel distribution All Gigabit Ethernet clock distribution FUNCTIONAL BLOCK DIAGRAM 1:6 Fanout Q0 /Q0 IN0 50Ω VT0 50Ω /IN0 VREF-AC0 IN1 50Ω VT1 50Ω /IN1 VREF-AC1 SEL (TTL/CMOS) 1 S 0 2:1 MUX Q1 /Q1 Q2 MUX /Q2 Q3 /Q3 Q4 /Q4 Q5 /Q5 Precision Edge is a trademark of Micrel, Inc. MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc. M9999-031604 hbwhelp@micrel.com or (408) 955-1690 Rev.: A Amendment: /0 1 Issue Date: March 2004 Micrel Precision Edge™ SY58034U PACKAGE/ORDERING INFORMATION GND SEL VCC Q0 /Q0 Q1 /Q1 VCC Ordering Information(1) GND VCC Q2 /Q2 Q3 /Q3 VCC GND IN0 VT0 VREF-AC0 /IN0 /IN1 VREF-AC1 VT1 IN1 1 2 3 4 5 6 7 8 32 3130 29 28 27 26 25 24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16 Part Number SY58034UMI SY58034UMITR(2) Notes: Package Type MLF-32 MLF-32 Operating Range Industrial Industrial Package Marking SY58034U SY58034U 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. 32-Pin MLF™ (MLF-32) PIN DESCRIPTION Pin Number 1, 4 8, 5 Pin Name IN0, /IN0 IN1, /IN1 Pin Function Differential Input: These input pairs are the differential signal inputs to the device. These inputs accept AC- or DC-coupled signals as small as 100mV. Each pin of a pair internally terminates to a VT pin through 50Ω. Note that these inputs will default to an indeterminate state if left open. Please refer to the “Input Interface Applications” section for more details. Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT0 and VT1 pins provide a center-tap to a termination network for maximum interface flexibility. See “Input Interface Applications” section for more details. This single-ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note that this input is internally connected to a 25kΩ pull-up resistor and will default to a logic HIGH state if left open. The MUX select switchover function is asynchronous. No connect. Positive Power Supply: Bypass with 0.1µF0.01µF low ESR capacitors. Differential Outputs: These CML output pairs are low skew output copies of the selected input. The output stage is optimized to deliver a 400mV swing (single-ended) into 50Ω. Each output includes a 50Ω source-termination resistor, thus minimizing any return reflections. Unused output pins may be left floating. Please refer to the “Truth Table” for details. Ground. Ground pin and exposed pad must be connected to the same ground plane. Reference Voltage: This output biases to VCC–1.2V. It is used for AC-coupling inputs (IN, /IN). Connect VREF-AC directly to the VT pin. Bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applications” section. Maximum sink/source is ±0.5mA. 2, 7 VT0, VT1 31 10 11, 16, 18, 23, 25, 30 29, 28 27, 26 22, 21 20, 19 15, 14 13, 12 9, 17, 24, 32 3, 6 Q0, /Q0, Q1, /Q1, Q2, /Q2, Q3, /Q3, Q4, /Q4, Q5, /Q5 GND, Exposed Pad VREF-AC0, VREF-AC1 TRUTH TABLE SEL 0 1 IN0 Input Selected IN1 Input Selected M9999-031604 hbwhelp@micrel.com or (408) 955-1690 GND NC VCC /Q5 Q5 /Q4 Q4 VCC SEL NC VCC 2 Micrel Precision Edge™ SY58034U Absolute Maximum Ratings(1) Power Supply Voltage (VCC ) ...................... –0.5V to +4.0V Input Voltage (VIN) ......................................... –0.5V to VCC CML Output Voltage (VOUT) ........... VCC–1.0V to VCC+0.5V Termination Current(3) Source or sink current on VT pin ........................ ±100mA Input Current Source or sink current on IN, /IN pin .................... ±50mA Lead Temperature (soldering, 10 sec.) ..................... 220°C Storage Temperature Range (TS ) ........... –65°C to +150°C Operating Ratings(2) Power Supply Voltage (VCC) ............... +2.375V to +2.625V ............................................................ +3.0V to +3.6V Ambient Temperature Range (TA) ............. –40°C to +85°C Package Thermal Resistance(4) MLF™ (θJA) Still-Air ............................................................. 35°C/W MLF™ (ψJB) Junction-to-Board ............................................ 20°C/W DC ELECTRICAL CHARACTERISTICS(5) TA= –40°C to 85°C, unless otherwise stated. Symbol VCC ICC RDIFF_IN RIN VIH VIL VIN VDIFF_IN VT IN VREF-AC Notes: 1. Permanent device damage may occur if the measurements in the “Absolute Maximum Ratings” section 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. Due to the limited drive capability, use for input of the same package only. 4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. ΨJB uses 4-layer θJA in still-air number unless otherwise stated. 5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. 6. VIH (min), not lower than 1.2V. Parameter Power Supply Voltage Condition VCC = 2.5V VCC = 3.3V No load, max. VCC Min 2.375 3.0 Typ 2.5 3.3 245 Max 2.625 3.6 320 120 60 VCC VIH–0.1 1.7 Units V V mA Ω Ω V V V V Power Supply Current Differential Input Resistance (IN-to-/IN) Input Resistance (IN-to-/IN) Input HIGH Voltage (IN-to-/IN) Input LOW Voltage (IN-to-/IN) Input Voltage Swing (IN-to-/IN) Differential Input Voltage Swing (IN-to-/IN) IN to VT (IN-to-/IN) Reference Voltage 80 40 Note 6 VCC–1.6 0 See Figure 1a. See Figure 1b. 0.1 0.2 100 50 1.28 VCC–1.3 VCC–1.2 VCC–1.1 V V M9999-031604 hbwhelp@micrel.com or (408) 955-1690 3 Micrel Precision Edge™ SY58034U CML OUTPUT DC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; TA= -40°C to 85°C; RL = 100Ω across each output pair, unless otherwise stated. Symbol VOH VOUT VDIFF_OUT ROUT Parameter Output HIGH Voltage Output Voltage Swing Differential Output Voltage Swing Output Source Impedance See Figure 1a. See Figure 1b. Condition Min VCC–0.020 325 650 40 400 800 50 60 Typ Max VCC Units V mV mV Ω LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(7) VCC = 2.5V ±5% or 3.3V ±10%; TA= -40°C to 85°C, unless otherwise stated. Symbol VIH VIL IIH IIL Note: 7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established. Parameter Input HIGH Voltage Input LOW Voltage Input HIGH Current Input LOW Current Condition Min 2.0 Typ Max Units V 0.8 40 –300 V µA µA M9999-031604 hbwhelp@micrel.com or (408) 955-1690 4 Micrel Precision Edge™ SY58034U AC ELECTRICAL CHARACTERISTICS(8) VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to 85°C, RL= 100Ω across each output pair, or equivalent, unless otherwise stated. Symbol fMAX tpd Parameter Maximum Operating Frequency Differential Propagation Delay (IN0 or IN1-to-Q) (SEL-to-Q) ∆tpd Tempco tSKEW Differential Propagation Delay Temperature Coefficient Output-to-Output Part-to-Part tJITTER Clock Cycle-to-Cycle Jitter Random Jitter (RJ) Total Jitter (TJ) Adjacent Channel Crosstalk-Induced Jitter tr, tf Notes: 8. High frequency AC electricals are guaranteed by design and characterization. 9. Output-to-output skew is measured between outputs under identical input conditions. 10. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the respective inputs. 11. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, Tn–Tn–1 where T is the time between rising edges of the output signal. 12. Random jitter is measured with a K28.7 comma detect characte