Precision Edge® Micrel, Inc. 2.5V/3.3V HIGH-PERFORMANCE, DUAL 1:10 SY89829U ® Precision Edge OR LVPECL CLOCK DRIVER w/ INTERNAL SY89829U TERMINATION AND REDUNDANT SWITCHOVER FEATURES ■ Dual 1:10 fanout buffer/translator Precision Edge® ■ Accepts LVPECL or LVDS inputs ■ Multiplexed inputs ideal for redundant clock ■ ■ ■ ■ ■ ■ DESCRIPTION switchover Guaranteed AC parameters: • > 2GHz fMAX (toggle) • < 50ps ch-ch skew LVDS input includes 100Ω Ω internal termination Low supply voltage: 2.5V, 3.3V –40°C to +85°C temperature range Output enable (OE) pin Available in 64 EPAD-TQFP The SY89829U is a High Performance dual 1:10 or single 1:20 LVPECL Clock Driver. The part is designed for use in low voltage (2.5V/3.3V) applications which require a large number of outputs to drive precisely aligned, ultra low skew signals to their destination. The input is multiplexed from either LVDS or LVPECL by the CLK_SEL pin. The LVDS inputs include a 100Ω internal termination across the input pair, thus eliminating any need for external termination. The 2:1 input mux makes this device an ideal choice for redundant clock applications that need to switch between two reference clocks. The output enable (OE) is synchronous so that the outputs will only be enabled/ disabled when they are already in the LOW state. This eliminates any chance of generating a runt clock pulse when the device is enabled/disabled as can happen with an asynchronous control. The SY89829U features low pin-to-pin skew (50ps max.) and low part-to-part skew (200ps max.)—performance previously unachievable in a standard product having such a high number of outputs. The SY89829U is available in a single space saving package which provides a lower overall cost solution. In addition, a single chip solution improves timing budgets by eliminating the multiple device solution with their corresponding large part-to-part skew. APPLICATIONS ■ High-performance PCs ■ Workstations ■ Parallel processor-based systems ■ Other high-performance computing ■ Communications ■ Redundant LVPECL or LVDS bus clock switchover Precision Edge is a registered trademark of Micrel, Inc. M9999-011907 [email protected] or (408) 955-1690 1 Rev.: D Amendment: /0 Issue Date: January 2007 Precision Edge® SY89829U Micrel, Inc. PACKAGE/ORDERING INFORMATION VCCO /Q6 Q6 /Q5 Q5 /Q4 Q4 /Q3 Q3 /Q2 Q2 /Q1 Q1 /Q0 Q0 VCCO Ordering Information(1) Package Operating Type Range 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 SEL2 LVDS_CLKB /LVDS_CLKB VCCI LVDS_CLKA /LVDS_CLKA CLK_SEL1 LVPECL_CLKA /LVPECL_CLKA GND OE1 LVPECL_CLKB /LVPECL_CLKB CLK_SEL2 OE2 SEL1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 64-Pin EPAD-TQFP (Top View) 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 VCCO Q7 /Q7 Q8 /Q8 Q9 /Q9 VCCO VCCO Q10 /Q10 Q11 /Q11 Q12 /Q12 VCCO VCCO /Q19 Q19 /Q18 Q18 /Q16 Q17 /Q16 Q16 /Q15 Q15 /Q14 Q14 /Q13 Q13 VCCO 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Part Number Package Marking Lead Finish SY89829UHI H64-1 Industrial SY89829UHI Sn-Pb SY89829UHITR(2) H64-1 Industrial SY89829UHI Sn-Pb SY89829UHY(3) H64-1 Industrial SY89829UHY with Pb-Free Pb-Free bar-line indicator Matte-Sn SY89829UHYTR(2, 3) H64-1 Industrial SY89829UHY with Pb-Free Pb-Free bar-line indicator Matte-Sn Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only. 2. Tape and Reel. 3. Pb-Free package recommended for new designs. 64-Pin TQFP (H64-1) PIN NAMES Pin Function LVDS_CLKA, /LVDS_CLKA, LVDS_CLKB, /LVDS_CLKB Differential LVDS Inputs with Internal 100Ω Termination. LVPECL_CLKA, /LVPECL_CLKA LVPECL_CLKB, /LVPECL_CLKB Differential LVPECL Inputs. For DC-coupled input signals, terminate the input signal with 50Ω to VCC –2V. For AC-coupled to VCC –2V. For AC-coupled terminate the input signal with 50Ω to VCC –3V. CLK_SEL1, CLK_SEL2 Input CLK Select (LVTTL). SEL1, SEL2 Input Select (LVTTL). OE1, OE2 Output Enable (LVTTL). Q0 – Q19, /Q0 – /Q19 Differential LVPECL Outputs. Normally terminated with 50Ω to VCC –2V. Unused output pairs can be left floating. GND Ground. VCCI Power Supply for Output Drivers. M9999-011907 [email protected] or (408) 955-1690 2 Precision Edge® SY89829U Micrel, Inc. LOGIC SYMBOL CLK_SEL1 OE1 SEL1 LVDS_CLKA /LVDS_CLKA LVPECL_CLKA /LVPECL_CLKA 0 10 0 10 1 Q0 – Q9 /Q0 – /Q9 1 LEN LVDS_CLKB /LVDS_CLKB LVPECL_CLKB /LVPECL_CLKB Q 0 D 1 0 10 10 CLK_SEL2 1 Q10 – Q19 /Q10 – /Q19 LEN SEL2 Q OE2 D TRUTH TABLE OE CLK_SEL1 CLK_SEL2 SEL1 SEL2 Q0 – Q9 /Q0 – /Q9 Q10 – Q19 /Q10 – /Q19 1 0 0 0 0 LVDS_CLKA /LVDS_CLKA LVDS_CLKA /LVDS_CLKA 1 0 0 0 1 LVDS_CLKA /LVDS_CLKA LVDS_CLKB /LVDS_CLKB 1 0 0 1 0 LVDS_CLKB /LVDS_CLKB LVDS_CLKA /LVDS_CLKA 1 0 0 1 1 LVDS_CLKB /LVDS_CLKB LVDS_CLKB /LVDS_CLKB 1 0 1 0 0 LVDS_CLKA /LVDS_CLKA LVDS_CLKA /LVDS_CLKA 1 0 1 0 1 LVDS_CLKA /LVDS_CLKA LVPECL_CLKB /LVPECL_CLKB 1 0 1 1 0 LVPECL_CLKB /LVPECL_CLKB LVDS_CLKA /LVDS_CLKA 1 0 1 1 1 LVPECL_CLKB /LVPECL_CLKB LVPECL_CLKB /LVPECL_CLKB 1 1 0 0 0 LVPECL_CLKA /LVPECL_CLKA LVPECL_CLKA /LVPECL_CLKA 1 1 0 0 1 LVPECL_CLKA /LVPECL_CLKA LVDS_CLKB /LVDS_CLKB 1 1 0 1 0 LVDS_CLKB /LVDS_CLKB LVPECL_CLKA /LVPECL_CLKA 1 1 0 1 1 LVDS_CLKB /LVDS_CLKB LVDS_CLKB /LVDS_CLKB 1 1 1 0 0 LVPECL_CLKA /LVPECL_CLKA LVPECL_CLKA /LVPECL_CLKA 1 1 1 0 1 LVPECL_CLKA /LVPECL_CLKA LVPECL_CLKB /LVPECL_CLKB 1 1 1 1 0 LVPECL_CLKB /LVPECL_CLKB LVPECL_CLKA /LVPECL_CLKA 1 1 1 1 1 LVPECL_CLKB /LVPECL_CLKB LVPECL_CLKB /LVPECL_CLKB 0 X X X X LOW HIGH LOW HIGH M9999-011907 [email protected] or (408) 955-1690 3 Precision Edge® SY89829U Micrel, Inc. ABSOLUTE MAXIMUM RATINGS(1) Symbol Rating Value Unit VCCI / VCCO VCC Pin Potential to Ground Pin –0.5 to +4.0 V VIN Input Voltage –0.5 to VCCI V IOUT DC Output Current (Output HIGH) –50 mA TLEAD Lead Temperature (soldering, 20sec.) 260 °C Tstore Storage Temperature –65 to +150 °C θJA Package Thermal Resistance (Junction-to-Ambient) With exposed pad soldered to GND – Still-Air (multi-layer PCB) – 200lfpm (multi-layer PCB) – 500lfpm (multi-layer PCB) 23 18 15 °C/W °C/W °C/W 44 36 30 °C/W °C/W °C/W 4.3 °C/W Exposed pad not soldered to GND θJC – Still-Air (multi-layer PCB) – 200lfpm (multi-layer PCB) – 500lfpm (multi-layer PCB) Package Thermal Resistance (Junction-to-Case) NOTE: 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 book. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. M9999-011907 [email protected] or (408) 955-1690 4 Precision Edge® SY89829U Micrel, Inc. DC ELECTRICAL CHARACTERISTICS Power Supply TA = –40°C Symbol Parameter Supply(1) VCCI, VCCO Power ICC ICC Total Supply Current(2) TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit 2.37 — 3.6 2.37 — 3.8 2.37 — 3.6 V — 100 150 — 100 150 — 100 150 mA NOTES: 1. VCCI and VCCO must be connected together on the PCB such that they remain at the same potential. VCCI and VCCO are not internally connected on the die. 2. No load. Outputs floating. LVDS Input (VCC = 2.37V to 3.6V, GND = 0V) TA = –40°C Symbol Parameter VIN Input Voltage Range VID Differential Input Swing Current(1) IIL Input Low RIN LVDS Differential Input Resistance (LVDS_CLK to /LVDS_CLK) TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit 0 — 2.4 0 — 2.4 0 — 2.4 V 100 — — 100 — — 100 — — mV –1.0 — — –1.0 — — –1.0 — — mA 80 100 120 80 100 120 80 100 120 Ω NOTE: 1. For IIL, both LVDS inputs are grounded. LVPECL Input / Output (VCC = 2.37V to 3.6V, GND = 0V) TA = –40°C Symbol Parameter TA = +25°C Min. Max. Min. Max. Min. Max. Unit VCC – 0.88 VCC – 1.165 VCC – 0.88 VCC – 1.165 VCC – 0.88 V VCC – 1.625 VCC – 1.945 VCC – 1.625 V VIH Input HIGH Voltage VCC – 1.165 VIL Input LOW Voltage VCC – 1.945 VCC – 1.625 VCC – 1.945 Swing(1) TA = +85°C VPP Minimum Input LVPECL_CLK 600 — 600 — 600 — mV VCMR Common Mode Range(2) LVPECL_CLK –1.5 –0.4 –1.5 –0.4 –1.5 –0.4 V VOH Output HIGH Voltage VCCO – 1.085 VCCO – 0.880 VCCO – 1.025 VCCO – 0.880 VCCO – 1.025 VCCO – 0.880 V VOL Output LOW Voltage VCCO – 1.830 VCCO – 1.555 VCCO – 1.810 VCCO – 1.620 VCCO – 1.810 VCCO – 1.620 V IIH Input HIGH Current — 150 — 150 — 150 µA IIL Input LOW Current 0.5 — 0.5 — 0.5 — µA NOTES: 1. The VPP (min.) is defined as the minimum input differential voltage which will cause no increase in the propagation delay. 2. VCMR is defined as the range within which the VIH level may vary, with the device still meeting the propagation delay specification. The numbers in the table are referenced to VCCI. The VIL level must be such that the peak-to-peak voltage is less than 1.0V and greater than or equal to VPP (min.). The lower end of the CMR range varies 1:1 with VCCI. The VCMR (min) will be fixed at 3.3V – |VCMR (min)|. LVCMOS/LVTTL Control Input (OE1, OE2, CLK_SEL1, CLK_SEL2) TA = –40°C Symbol Parameter TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit VIH Input HIGH Voltage 2.0 — — 2.0 — — 2.0 — — V VIL Input LOW Voltage — — 0.8 — — 0.8 — — 0.8 V IIH Input HIGH Current +20 — –250 +20 — –250 +20 — –250 µA IIL Input LOW Current — — –600 — — –600 — — –600 µA M9999-011907 [email protected] or (408) 955-1690 5 Precision Edge® SY89829U Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(1) VCC = 2.37V to 3.6V, GND = 0V TA = –40°C Symbol Parameter Frequency(2) fMAX Max Toggle tPD Propagation Delay (Differential)(3) LVPECL IN LVDS IN tSKEW Within-Device Skew(4) Part-to-Part tS(OE) OE Set-Up Skew(5) Time(6) Time(6) tH(OE) OE Hold tr tf Output Rise/Fall Time (20% – 80%) t(switchover) Input Switchover CLK_SEL-to-valid output TA = +25°C TA = +85°C Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit 2 — — 2 — — 2 — — GHz 0.900 1.1 — — 1.5 1.7 0.900 1.1 1.2 — 1.5 1.7 0.900 1.1 — — 1.5 1.7 — — 35 — 20 35 — — 35 ps — 100 200 — 100 200 — 100 200 ps 1.0 — — 1.0 — — 1.0 — — ns 0.5 — — 0.5 — — 0.5 — — ns 300 — 600 300 450 600 300 — 600 ps — — 1.2 — — 1.2 — — 1.2 ns ns NOTES: 1. Outputs loaded with 50Ω to VCC – 2V. Airflow ≥ 300lfpm. 2. fMAX is defined as the maximum toggle frequency measured. Measured with a 750mV input signal, all loading with 50Ω to VCC –2V. 3. Differential propagation delay is defined as the delay from the crossing point of the differential input signals to the crossing point of the differential output signals. 4. The within-device skew is defined as the worst case difference between any two similar delay paths within a single device operating at the same voltage and temperature. 5. The part-to-part skew is defined as the absolute worst case difference between any two delay paths on any two devices operating at the same voltage and temperature. Part-to-part skew is the total skew difference; pin-to-pin skew + part-to-part skew. 6. Set-up and hold time applies to synchronous applications that intend to enable/disable before the next clock cycle. For asynchronous applications, set-up and hold time does not apply. OE set-up time is defined with respect to the rising edge of the clock. OE HIGH to LOW transition ensures outputs remain disabled during the next clock cycle. OE LOW to HIGH transition enables normal operation of the next input clock. M9999-011907 [email protected] or (408) 955-1690 6 Precision Edge® SY89829U Micrel, Inc. LVDS/LVPECL INPUTS VCC VCC 75k 1.9k 1.9k LVPECL_CLK 75k 75k 1.9k 1.9k VIN 100½ /LVPECL_CLK VIN GND GND LVPECL Input Stage LVDS Input Stage Figure 1. Simplified LVPECL & LVDS Input Stage M9999-011907 [email protected] or (408) 955-1690 7 Precision Edge® SY89829U Micrel, Inc. TYPICAL CHARACTERISTICS Frequency Response vs. Output Amplitude Frequency Response vs. Output Amplitude 900 4000 3500 3000 200 0 FREQUENCY (MHz) FREQUENCY (MHz) Frequency Response vs. Output Amplitude @2.5V M9999-011907 [email protected] or (408) 955-1690 300 100 4000 3500 3000 2500 2000 1500 0 100 1000 200 400 2500 300 500 2000 400 600 1500 500 700 1000 600 VSUP = 3.3V VDIFFIN = 800mV 800 500 700 OUTPUT AMPLITUDE (mV) VSUP = 2.5V VDIFFIN = 800mV 800 500 OUTPUT AMPLITUDE (mV) 900 Frequency Response vs. Output Amplitude @3.3V 8 Precision Edge® SY89829U Micrel, Inc. LVPECL TERMINATION RECOMMENDATIONS down resistor at the output of each driver. The emmiter follower outputs requires a DC current path to GND. Unused outputs can be left floating with minimal impact on skew and jitter. Output Considerations Be sure to properly terminate all outputs as shown below, or equivalent. For AC coupled applications, be sure to include a pull +3.3V R1 130Ω R1 130Ω +3.3V ZO = 50Ω +3.3V ZO = 50Ω R2 82Ω R2 82Ω Vt = VCC —2V Figure 1. Parallel Termination–Thevenin Equivalent Notes: 1. For +2.5V systems: R1 = 250Ω R2 = 62.5Ω +3.3V +3.3V Z = 50Ω “source” “destination” Z = 50Ω 50Ω 46Ω to 49Ω 50Ω Rb Figure 2. Three-Resistor “Y–Termination” Notes: 1. Power-saving alternative to Thevenin termination. 2. Place termination resistors as close to destination inputs as possible. 3. Rb resistor sets the DC bias voltage equal to Vt. For +3.3V systems Rb = 46Ω to 50Ω. 4. Precision, low-cost 3-Resistor networks are available from resistor manufacturers such as Thin Film Technology (www.thinfilm.com). M9999-011907 [email protected] or (408) 955-1690 9 Precision Edge® SY89829U Micrel, Inc. 64-PIN EPAD-TQFP (DIE UP) (H64-1) 12.00 0.472 BSC SQ. 1.00 +0.05 –0.05 0.039 +0.002 –0.002 4 10.00 0.394 BSC SQ. 4.50 0.177 +0.05 –0.05 +0.012 –0.012 48 64 6 DETAIL "A" 0° MIN. 6 7 0.20 0.008 0.09 0.004 0.15 0.006 0.05 0.002 48 0°- 7° 4.50 +0.03 –0.03 0.177+0.012 –0.012 0.60 +0.15 –0.15 0.024 +0.006 –0.006 1.00 0.039 REF. 33 16 17 32 5 0.50 0.020 1.20 0.047 MAX SEE DETAIL "A" BSC 0.01 0.004 7 0.22 +0.05 –0.05 +0.002 0.009 –0.002 Rev. 03 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-011907 [email protected] or (408) 955-1690 10