ASM5I961P July 2005 rev 0.2 Low Voltage Zero Delay Buffer Features reference clock while the ASM5I961P offers an LVPECL Fully Integrated PLL reference clock. Up to 200MHz I/O Frequency When pulled high the OE pin will force all of the outputs LVCMOS Outputs (except QFB) into a high impedance state. Because the OE Outputs Disable in High Impedance pin does not affect the QFB output, down stream clocks LVPECL Reference Clock Options LQFP Packaging The ASM5I961P is fully 2.5V or 3.3V compatible and ±50pS Cycle–Cycle Jitter requires no external loop filter components. All control 150pS Output Skews can be disabled without the internal PLL losing lock. inputs accept LVCMOS compatible levels and the outputs provide low impedance LVCMOS outputs capable of Functional Description driving terminated 50Ω transmission lines. For series The ASM5I961P is a 2.5V or 3.3V compatible, 1:18 PLL terminated lines the ASM5I961P can drive two lines per based zero delay buffer. With output frequencies of up to output giving the device an effective fanout of 1:36. The 200MHz, output skews of 150pS the device meets the device is packaged in a 32 lead LQFP package to provide needs of the most demanding clock tree applications. the The ASM5I961P combination of board density performance. The ASM5I961P is offered with two different input configurations. optimum offers an LVCMOS Block Diagram VCC PCLK PCLK Q0 50K Ref 50K 50K FB FB_IN Q1 PLL 100-200 MHz 0 50-100 MHz 1 Q2 Q3 50K Q14 F_RANGE 50K Q15 Q16 OE 50K QFB Figure 1. ASM5I961P Logic Diagram Alliance Semiconductor 2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com Notice: The information in this document is subject to change without notice. and ASM5I961P July 2005 rev 0.2 Q11 Q10 Q9 GND Q8 Q7 Q6 VCC Pin Configuration 24 23 22 21 20 19 18 17 Q5 25 16 VCC Q4 26 15 Q12 14 Q13 13 Q14 Q3 27 GND 28 Q2 29 12 GND Q1 30 11 Q15 Q0 31 10 Q16 VCC 32 9 QFB 4 5 PCLK PCLK F_RANGE VCCA 6 7 8 VCC 3 FB_IN 2 OE 1 GND ASM5I961P ASM5I961C Figure 2. ASM5I961P 32-Lead Package Pinout (Top View) Table 1: Pin Configuration Pin # I/O Type PCLK, ¯¯¯¯¯ PCLK Input LVCMOS PLL reference clock signal 7 FB_IN Input LVCMOS PLL feedback signal input, connect to a QFB output 4 F_RANGE Input LVCMOS PLL frequency range select 6 ¯¯ OE Input LVCMOS Output enable/disable Q0 - Q16 Output LVCMOS Clock outputs 9 QFB Output LVCMOS PLL feedback signal output, connect to a FB_IN 1,12,20,28 GND Supply Power Negative power supply 2,3 31,30,29,27,26,25,23,22,21 ,19,18,17,15,14,13,11,10 5 8,16,24,32 Pin Name Function VCCA Supply Power PLL positive power supply (analog power supply). The ASM5I961P requires an external RC filter for the analog power supply pin VCCA. Please see applications section for details. VCC Supply Power Positive power supply for I/O and core Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 2 of 14 ASM5I961P July 2005 rev 0.2 Table 2: Function Table Control Default 0 1 F_RANGE 0 PLL high frequency range. ASM5I961P input reference and output clock frequency range is 100 – 200 MHz PLL low frequency range. ASM5I961P input reference and output clock frequency range is 50 – 100 MHz ¯¯ OE 0 Outputs enabled Outputs disabled (high–impedance state) Table 3: Absolute Maximum Ratings Symbol Parameter Min Max Unit VCC Supply Voltage –0.3 3.6 V VIN DC Input Voltage –0.3 VCC + 0.3 V VOUT DC Output Voltage –0.3 VCC + 0.3 V IIN DC Input Current ±20 mA IOUT TS DC Output Current Storage Temperature Range ±50 125 mA °C TDV Static Discharge Voltage (As per JEDEC STD 22- A114-B) –40 2 KV Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. Table 4: DC Characteristics (VCC = 3.3V ± 5%, TA = -40°C to +85°C) Symbol Characteristic Min Typ Max Unit Condition VIH Input HIGH Voltage 2.0 VCC + 0.3 V LVCMOS VIL –0.3 0.8 V LVCMOS 500 1000 mV LVPECL 1.2 VCC – 0.8 V LVPECL VOH Input LOW Voltage Peak–to–peak input voltage1 PECL_CLK, ¯¯¯¯¯¯¯¯¯¯ PECL_CLK Common Mode Range1 PECL_CLK, ¯¯¯¯¯¯¯¯¯¯ PECL_CLK Output HIGH Voltage V IOH = –20mA2 VOL Output LOW Voltage V IOL = 20mA2 ZOUT Output Impedance IIN Input Current CIN Input Capacitance 4.0 CPD Power Dissipation Capacitance 8.0 10 pF Per Output ICCA Maximum PLL Supply Current 2.0 5.0 mA VCCA Pin ICC VTT Maximum Quiescent Supply Current Output Termination Voltage mA V All VCC Pins VPP VCMR 2.4 0.55 14 20 Ω ±120 mA pF VCC÷2 Notes: 1. Exceeding the specified VCMR/VPP window results in a tPD changes of approx. 250pS. 2. The ASM5I961P is capable of driving 50Ω transmission lines on the incident edge. Each output drives one 50Ω parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up two 50Ω series terminated transmission lines. Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 3 of 14 ASM5I961P July 2005 rev 0.2 Table 5: AC Characteristics (VCC = 3.3V ± 5%, TA = -40°C to +85°C)1 Symbol Characteristic Min Typ Max Unit fref Input Frequency F_RANGE = 0 F_RANGE = 1 100 50 200 100 MHz fmax Maximum Output Frequency F_RANGE = 0 F_RANGE = 1 100 50 200 100 MHz 25 75 % –50 225 pS 90 150 pS 50 50 55 55 % 1.0 nS 10 nS 10 nS frefDC Reference Input Duty Cycle Condition 2 t(φ) tsk(O) DCO PECL_CLK to Propagation Delay FB_IN (static phase offset) 3 Output to Output Skew F_RANGE = 0 Output Duty Cycle F_RANGE = 1 tr, tf Output Rise/Fall Time tPLZ,HZ Output Disable Time tPZL,LZ Output Enable Time 42 45 0.1 4 tJIT(CC) Cycle to Cycle Jitter RMS (1σ) tJIT(PER) Period Jitter tJIT(φ) I/O Phase Jitter RMS (1σ) RMS (1σ) F_RANGE = 0 F_RANGE = 1 tlock Maximum PLL Lock Time 15 pS 10 pS 0.0015 ⋅ T 0.0010 ⋅ T 10 nS 7.0 PLL locked 0.55 to 2.4V T = Clock Signal Period mS Notes: 1. AC characteristics apply for parallel output termination of 50Ω to VTT. 2. tPD applies for VCMR = VCC–1.3V and VPP = 800mV 3. See applications section for part to part skew calculation 4. See applications section for calculation for other confidence factors than 1σ Table 6: DC Characteristics (VCC = 2.5V ± 5%, TA = –40° to 85°C) Symbol Max Unit Condition VIH Input HIGH Voltage 1.7 VCC + 0.3 V LVCMOS VIL –0.3 0.7 V LVCMOS 500 1000 mV LVPECL VCC – 0.7 V LVPECL VOH Input LOW Voltage Peak–to–peak input voltage1 PECL_CLK, ¯¯¯¯¯¯¯¯¯¯ PECL_CLK Common Mode Range1 PECL_CLK, ¯¯¯¯¯¯¯¯¯¯ PECL_CLK Output HIGH Voltage V IOH = –15mA2 VOL Output LOW Voltage 0.6 V IOL = 15mA2 ZOUT Output Impedance 26 Ω IIN Input Current ±120 mA CIN Input Capacitance 4.0 CPD Power Dissipation Capacitance 8.0 10 pF ICCA Maximum PLL Supply Current 2.0 5.0 mA VCCA Pin ICC VTT Maximum Quiescent Supply Current Output Termination Voltage mA V All VCC Pins VPP VCMR Characteristic Min Typ 1.2 1.8 18 pF VCC÷2 Per Output Notes: 1. Exceeding the specified VCMR/VPP window results in a tPD changes of < 250 pS. 2. The ASM5I961P is capable of driving 50Ω transmission lines on the incident edge. Each output drives one 50Ω parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up two 50Ω series terminated transmission lines. Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 4 of 14 ASM5I961P July 2005 rev 0.2 Table 7: AC Characteristics (VCC = 2.5V ± 5%, TA = -40°C to +85°C)1 Symbol Characteristic fref Input Frequency F_RANGE = 0 F_RANGE = 1 fmax Maximum Output Frequency F_RANGE = 0 F_RANGE = 1 frefDC Reference Input Duty Cycle Min Max Unit 100 50 Typ 200 100 MHz 100 50 200 100 MHz 25 75 % –50 175 pS 90 150 pS 50 50 60 55 % 1.0 nS Condition 2 t(φ) tsk(O) DCO tr, tf PECL_CLK to Propagation Delay FB_IN (static phase offset) 3 Output–to–Output Skew F_RANGE = 0 Output Duty Cycle F_RANGE = 1 Output Rise/Fall Time 40 45 0.1 tPLZ,HZ Output Disable Time 10 nS tPZL,LZ Output Enable Time 10 nS tJIT(CC) Cycle–to–Cycle Jitter RMS (1σ)4 15 pS tJIT(PER) Period Jitter 10 pS tJIT(φ) I/O Phase Jitter RMS (1σ) RMS (1σ) F_RANGE = 0 F_RANGE = 1 nS tlock Maximum PLL Lock Time 0.0015 ⋅ T 0.0010 ⋅ T 10 7.0 PLL locked 0.6 to 1.8V T = Clock Signal Period mS Notes: 1. AC characteristics apply for parallel output termination of 50Ω to VTT. 2. tPD applies for VCMR = VCC–1.3V and VPP = 800mV 3. See applications section for part–to–part skew calculation 4. See applications section for calculation for other confidence factors than 1σ Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 5 of 14 ASM5I961P July 2005 rev 0.2 APPLICATIONS INFORMATION Power Supply Filtering The ASM5I961P is a mixed analog/digital product and as such it exhibits some sensitivities that would not necessarily be seen on a fully digital product. Analog circuitry is naturally susceptible to random noise, especially if this noise is seen on the power supply pins. The ASM5I961P provides separate power supplies for the output buffers (VCC) and the phase–locked loop (VCCA) of the device. The purpose of this design technique is to isolate the high switching noise digital outputs from the relatively sensitive internal analog phase–locked loop. In a controlled environment such as an evaluation board this level of isolation is sufficient. However, in a digital system environment where it is more difficult to minimize noise on the power supplies a second level of isolation may be required. The simplest form of isolation is power supply filter on the VCCA pin for the ASM5I961P. Figure 3. illustrates a typical power supply filter scheme. The ASM5I961P is most susceptible to noise with spectral content in the 10KHz to 5MHz range. Therefore the filter should be designed to target this range. The key parameter that needs to be met in the final filter design is the DC voltage drop that will be seen between the VCC supply and the VCCA pin of the ASM5I961P. From the data sheet the ICCA current (the current sourced through the VCCA pin) is typically 2mA (5mA maximum), assuming that a minimum of 2.375V (VCC =3.3V or VCC = 2.5V) must be maintained on the VCCA pin. The resistor RF shown in Figure 3. must have a resistance of 270 (VCC = 3.3V) or 5 to 15 (VCC = 2.5V) to meet the voltage drop criteria. The RC filter pictured will provide a broadband filter with approximately 100:1 attenuation for noise whose spectral content is above 20KHz. As the noise frequency crosses the series resonant point of an individual capacitor it’s overall impedance begins to look inductive and thus increases with increasing frequency. The parallel capacitor combination shown ensures that a low impedance path to ground exists for frequencies well above the bandwidth of the PLL. VCC Driving Transmission Lines The ASM5I961P clock driver was designed to drive high speed signals in a terminated transmission line environment. To provide the optimum flexibility to the user the output drivers were designed to exhibit the lowest impedance possible. With an output impedance of less than 15Ω the drivers can drive either parallel or series terminated transmission lines. In most high performance clock networks point to point distribution of signals is the method of choice. In a point to point scheme either series terminated or parallel terminated transmission lines can be used. The parallel technique terminates the signal at the end of the line with a 50Ω resistance to VCC/2. This technique draws a fairly high level of DC current and thus only a single terminated line can be driven by each output of the ASM5I961P clock driver. For the series terminated case however there is no DC current draw, thus the outputs can drive multiple series terminated lines. Figure 4. illustrates an output driving a single series terminated line vs two series terminated lines in parallel. When taken to its extreme the fanout of the ASM5I961P clock driver is effectively doubled due to its capability to drive multiple lines. ASM5I961P OUTPUT BUFFER IN 14Ω RS=36Ω ASM5I961P OUTPUT BUFFER IN RF = 270Ω for VCC = 3.3V RF = 5-15Ω for VCC = 2.5V RF 22 µF Although the ASM5I961P has several design features to minimize the susceptibility to power supply noise (isolated power and grounds and fully differential PLL) there still may be applications in which overall performance is being degraded due to system power supply noise. The power supply filter schemes discussed in this section should be adequate to eliminate power supply noise related problems in most designs. RS=36Ω 14Ω RS=36Ω Z0=50Ω OUTA Z0=50Ω OUTB0 Z0=50Ω OUTB1 VCCA 10 nF ASM5I961P VCC 33…100 nF Figure 3. Power Supply Filter Figure 4. Single versus Dual Transmission Lines The waveform plots of Figure 5. show the simulation results of an output driving a single line vs two lines. In both cases the drive capability of the ASM5I961P output buffer is more than sufficient to drive 50Ω transmission lines on the incident edge. Note from the delay measurements in the simulations a delta of only 43ps exists between the two differently loaded outputs. This suggests that the dual line driving need not be used exclusively to maintain the tight output–to–output skew of the ASM5I961P. The output waveform in Figure 5. shows Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 6 of 14 ASM5I961P July 2005 rev 0.2 a step in the waveform, this step is caused by the impedance mismatch seen looking into the driver. The parallel combination of the 36Ω series resistor plus the output impedance does not match the parallel combination of the line impedances. The voltage wave launched down the two lines will equal: VL = VS ( Zo / (Rs + Ro +Zo)) Zo = 50Ω || 50Ω Rs = 36Ω || 36Ω Ro = 14Ω VL = 3.0 (25 / (18 + 14 + 25) = 3.0 (25 / 57) = 1.31V At the load end the voltage will double, due to the near unity reflection coefficient, to 2.62V. It will then increment towards the quiescent 3.0V in steps separated by one round trip delay (in this case 4.0nS). 3.0 VOLTAGE (V) 2.5 Nested clock trees are typical applications for the ASM5I961P. Designs using the ASM5I961P, as LVCMOS PLL fanout buffer with zero insertion delay will show significantly lower clock skew than clock distributions developed from CMOS fanout buffers. The external feedback option of the ASM5I961P clock driver allows for its use as a zero delay buffer. By using the QFB output as a feedback to the PLL the propagation delay through the device is virtually eliminated. The PLL aligns the feedback clock output edge with the clock input reference edge resulting a near zero delay through the device. The maximum insertion delay of the device in zero-delay applications is measured between the reference clock input and any output. This effective delay consists of the static phase offset, I/O jitter (phase or long-term jitter), feedback path delay and the output-to-output skew error relative to the feedback output. Calculation of part-to-part skew OutA tD = 3.8956 OutB tD = 3.9386 The ASM5I961P zero delay buffer supports applications where critical clock signal timing can be maintained across several devices. If the reference clock inputs of two or more ASM5I961P are connected together, the maximum overall timing uncertainty from the common PCLK input to any output is: 2.0 In 1.5 1.0 tSK(PP) = t(φ) + tSK(O) + tPD, LINE(FB) + tJIT(φ) ⋅ CF 0.5 This maximum timing uncertainty consist of 4 components: static phase offset, output skew, feedback board trace delay and I/O (phase) jitter: 0 2 4 6 8 10 12 14 PCLKCommon Figure 5. Single versus Dual Waveforms Since this step is well above the threshold region it will not cause any false clock triggering, however designers may be uncomfortable with unwanted reflections on the line. To better match the impedances when driving multiple lines the situation in Figure 6. should be used. In this case the series terminating resistors are reduced such that when the parallel combination is added to the output buffer impedance the line impedance is perfectly matched. ASM5I961P OUTPUT BUFFER RS=22Ω Z0=50Ω tPD,LINE (FB) -t(Ø) TIME (nS) QFBDevice 1 tJIT(Ø) Any QDevice 1 +tSK(O) +t(Ø QFBDevice 2 tJIT(Ø) IN 14Ω RS=22Ω Z0=50Ω Any QDevice 2 14Ω + 22Ω || 22Ω = 50Ω || 50Ω 25Ω = 25Ω Figure 6. Optimized Dual Line Termination Using the ASM5I961P in zero-delay applications +tSK(O) Max. skew tSK(PP) Figure 7. ASM5I961P max. device-to-device skew Due to the statistical nature of I/O jitter a rms value (1σ) is specified. I/O jitter numbers for other confidence factors (CF) can be derived from Table 8. Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 7 of 14 ASM5I961P July 2005 rev 0.2 Table 8: Confidence Factor CF ± 1σ Probability of clock edge within the distribution 0.68268948 ± 2σ 0.95449988 ± 3σ 0.99730007 ± 4σ 0.99993663 ± 5σ 0.99999943 ± 6σ 0.99999999 CF Table 9: Die junction temperature and MTBF The feedback trace delay is determined by the board layout and can be used to fine-tune the effective delay through each device. In the following example calculation a I/O jitter confidence factor of 99.7% (± 3 σ) is assumed, resulting in a worst case timing uncertainty from input to any output of -236pS to 361pS relative to PCLK (f=125 MHz, VCC=2.5V): Junction temperature (°C) tSK(PP) = [–50ps...175ps] + [–150ps...150ps] + [(12ps* –3)...(12ps *3)] + tPD, LINE(FB) tSK(PP) = [–236ps...361ps] + tPD, LINE(FB) Increased power consumption will increase the die junction temperature and impact the device reliability (MTBF). According to the system-defined tolerable MTBF, the die junction temperature of the ASM5I961P needs to be controlled and the thermal impedance of the board/package should be optimized. The power dissipated in the ASM5I961P is represented in equation 1. Where ICCQ is the static current consumption of the ASM5I961P, CPD is the power dissipation capacitance per output, (M)ΣCL represents the external capacitive output load, N is the number of active outputs (N is always 27 in case of the ASM5I961P). The ASM5I961P supports driving transmission lines to maintain high signal integrity and tight timing parameters. Any transmission line will hide the lumped capacitive load at the end of the board trace, therefore, ΣCL is zero for controlled transmission line systems and can be eliminated from equation 1. Using parallel termination output termination results in equation 2 for power dissipation. In equation 2, P stands for the number of outputs with a parallel or thevenin termination, VOL, IOL, VOH and IOH are a function of the output termination technique and DCQ is the clock signal duty cycle. If transmission lines are used ΣCL is zero in equation 2 and can be eliminated. In general, the use of controlled transmission line techniques eliminates the impact of the lumped capacitive loads at the end lines and greatly reduces the power dissipation of the device. Equation 3 describes the die junction temperature TJ as a function of the power consumption. Due to the frequency dependence of the I/O jitter, Figure 8. “Max. I/O Jitter versus frequency” can be used for a more precise timing performance analysis. F_RANGE=0 F_RANGE=1 18 tjit(Ø)[ps] RMS The ASM5I961P AC specification is guaranteed for the entire operating frequency range up to 200 MHz. The ASM5I961P power consumption and the associated longterm reliability may decrease the maximum frequency limit, depending on operating conditions such as clock frequency, supply voltage, output loading, ambient temperature, vertical convection and thermal conductivity of package and board. This section describes the impact of these parameters on the junction temperature and gives a guideline to estimate the ASM5I961P die junction temperature and the associated device reliability. TA = 85°C 16 14 VCC=2.5V 12 VCC=3.3V 10 VCC=3.3V 8 VCC=2.5V 6 4 2 0 50 70 90 110 130 170 190 150 Clock frequency [MHz] Figure 8. Max. I/O Jitter versus frequency Power Consumption of the ASM5I961P and Thermal Management 100 MTBF (Years) 20.4 110 9.1 120 130 4.2 2.0 Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 8 of 14 ASM5I961P July 2005 rev 0.2 PTOT = I CCQ + VCC ⋅ f CLOCK ⋅ N ⋅ C PD + ∑ C L ⋅ VCC M Equation 1 PTOT = VCC ⋅ I CCQ + VCC ⋅ f CLOCK ⋅ N ⋅ C PD + ∑ C L + ∑ DC Q ⋅ I OH (VCC − VOH ) + (1 − DC Q ) ⋅ I OL ⋅ VOL Equation 2 M P TJ = T A + PTOT ⋅ Rthja Equation 3 [ f CLOCKMAX = C PD 1 2 ⋅ N ⋅ VCC T − TA ⋅ JMAX − (I CCQ ⋅ VCC ) Rthja Where Rthja is the thermal impedance of the package (junction to ambient) and TA is the ambient temperature. According to Table 9, the junction temperature can be used to estimate the long-term device reliability. Further, combining equation 1 and equation 2 results in a maximum operating frequency for the ASM5I961P in a series terminated transmission line system. Table 10: Thermal package impedance of the 32LQFP Convection, LFPM ] Rthja (1P2S board), K/W Still air 80 100 lfpm 70 200 lfpm 61 300 lfpm 57 400 lfpm 500 lfpm 56 55 Equation 4 boards, using 2S2P boards will result in a lower thermal impedance than indicated below. If the calculated maximum frequency is below 200 MHz, it becomes the upper clock speed limit for the given application conditions. The following two derating charts describe the safe frequency operation range for the ASM5I961P. The charts were calculated for a maximum tolerable die junction temperature of 110°C, corresponding to an estimated MTBF of 9.1 years, a supply voltage of 3.3V and series terminated transmission line or capacitive loading. Depending on a given set of these operating conditions and the available device convection a decision on the maximum operating frequency can be made. There are no operating frequency limitations if a 2.5V power supply or the system specifications allow for a MTBF of 4 years (corresponding to a max. junction temperature of 120°C. TJ,MAX should be selected according to the MTBF system requirements and Table 9. Rthja can be derived from Table 10. The Rthja represent data based on 1S2P Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 9 of 14 ASM5I961P July 2005 rev 0.2 Operating frequency (MHz) Operating frequency (MHz) 190 TA = 85°C 160 140 120 100 80 Safe operation 60 fMAX (AC) 200 fMAX (AC) 200 190 TA = 75°C 160 TA = 85°C 140 120 100 80 Safe operation 60 40 40 20 20 0 0 500 400 200 300 Convection Ifpm 100 0 Figure 9. Maximum ASM5I961P frequency, VCC = 3.3V, MTBF 9.1 years, driving series terminated transmission lines Differential Pulse Generator Z=50Ω 500 400 200 300 Convection Ifpm 100 0 Figure 10. Maximum ASM5I961P frequency, VCC = 3.3V, MTBF 9.1 years, 4pF load per line Z0=50Ω Z0=50Ω RT=50Ω RT=50Ω VTT VTT Figure 11. TCLK ASM5I961P AC test reference for VCC = 3.3V and VCC = 2.5V Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 10 of 14 ASM5I961P July 2005 rev 0.2 PCLK VPP VCC = 3.3V VCMR PCLK VCC Ext_FB 2.4 1.8V 0.55 0.6V tR tF VCC ÷2 VCC = 2.5V GND t(Ø) Figure 13. Output Transition Time Test Reference Figure 12. Propagation Delay (t(Ø)). Static phase offset test reference VCC VCC ÷2 VCC GND VCC ÷2 GND VCC tP VCC ÷2 GND tSK(O) T0 The pin-to-pin skew is defined as the worst case difference in propagation delay between any similar delay path within a single device DC= (tP ÷T0 Χ 100%) The time from the PLL controlled edge to the non-controlled edge, divided by the time between PLL controlled edges, expressed as a percentage. Figure 15. Output–to–Output Skew tSK(O) Figure 14. Output Duty Cycle (DC) T0 TN TN-1 TJIT(CC) =│TN-TN-1 mean│ The variation in cycle time of a signal between adjacent cycles, over a random sample of adjacent cycle pairs TJIT(PER) =│TN-1/f0│ The deviation in cycle time of a signal with respect to the ideal period over a random sample of cycles Figure 16. Cycle-to-cycle Jitter Figure 17. Period Jitter PCLK PCLK Ext_FB TJIT(Ø) =│T0-T1 mean│ The deviation in t0 for a controlled edge with respect to a t0 mean in a random sample of cycles Figure 18.I/O Jitter Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 11 of 14 ASM5I961P July 2005 rev 0.2 Package Information 32-lead LQFP Package SECTION A-A Symbol Dimensions Inches Millimeters Min Max Min Max A …. 0.0630 … 1.6 A1 0.0020 0.0059 0.05 0.15 A2 0.0531 0.0571 1.35 1.45 D 0.3465 0.3622 8.8 9.2 D1 0.2717 0.2795 6.9 7.1 E 0.3465 0.3622 8.8 9.2 E1 0.2717 0.2795 6.9 7.1 L 0.0177 0.0295 0.45 0.75 L1 0.03937 REF 1.00 REF T 0.0035 0.0079 0.09 0.2 T1 0.0038 0.0062 0.097 0.157 b 0.0118 0.0177 0.30 0.45 b1 0.0118 0.0157 0.30 0.40 R0 0.0031 0.0079 0.08 0.20 e a 0.031 BASE 0° 7° 0.8 BASE 0° 7° Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 12 of 14 ASM5I961P July 2005 rev 0.2 Ordering Information Marking Part Number Package Type Temperature ASM5I961P-32LR ASM5I961P 32 pin LQFP Industrial ASM5I961P-32LR ASM5I961P 32 pin LQFP – Tape and Reel Industrial ASM5I961PG-32LR ASM5I961PG 32 pin LQFP, Green Industrial ASM5I961PG-32LR ASM5I961PG 32 pin LQFP – Tape and Reel, Green Industrial Device Ordering Information A S M 5 I 9 6 1 P F - 3 2 - L R R = Tape & reel, T = Tube or Tray O = SOT S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70 DEVICE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE PART NUMBER X= Automotive I= Industrial P or n/c = Commercial (-40C to +125C) (-40C to +85C) (0C to +70C) 1 = Reserved 2 = Non PLL based 3 = EMI Reduction 4 = DDR support products 5 = STD Zero Delay Buffer 6 = Power Management 7 = Power Management 8 = Power Management 9 = Hi Performance 0 = Reserved ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 13 of 14 ASM5I961P July 2005 rev 0.2 Alliance Semiconductor Corporation 2575 Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Part Number: ASM5I961P Document Version: 0.2 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003 © Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. Low Voltage Zero Delay Buffer Notice: The information in this document is subject to change without notice. 14 of 14