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| MOTOROLA SEMICONDUCTOR TECHNICAL DATA Freescale Semiconductor, Inc. Order Number: MPC9352/D Rev 3, 06/2003 3.3V/2.5V 1:11 LVCMOS Zero Delay Clock Generator The MPC9352 is a 3.3V or 2.5V compatible, 1:11 PLL based clock generator targeted for high performance clock tree applications. With output frequencies up to 200 MHz and output skews lower than 200 ps the device meets the needs of most demanding clock applications. Features * Configurable 11 outputs LVCMOS PLL clock generator MPC9352 Freescale Semiconductor, Inc... * Fully integrated PLL * Wide range of output clock frequency of 16.67 MHz to 200 MHz * Multiplication of the input reference clock frequency by 3, 2, 1, 3B2, * * * * 2B3, 1B3 and 1B2 2.5V and 3.3V LVCMOS compatible Maximum output skew of 200 ps Supports zero-delay applications LOW VOLTAGE 3.3V/2.5V LVCMOS 1:11 CLOCK GENERATOR Designed for high-performance telecom, networking and computing applications * 32 lead LQFP package * Ambient Temperature Range -40C to +85C FA SUFFIX Functional Description 32 LEAD LQFP PACKAGE The MPC9352 is a fully 3.3V or 2.5V compatible PLL clock generator CASE 873A and clock driver. The device has the capability to generate output clock signals of 16.67 to 200 MHz from external clock sources. The internal PLL optimized for its frequency range and does not require external look filter components. One output of the MPC9352 has to be connected to the PLL feedback input FB_IN to close the external PLL feedback path. The output divider of this output setting determines the PLL frequency multiplication factor. This multiplication factor, F_RANGE and the reference clock frequency must be selected to situate the VCO in its specified lock range. The frequency of the clock outputs can be configured individually for all three output banks by the FSELx pins supporting systems with different but phase-aligned clock frequencies. The PLL of the MPC9352 minimizes the propagation delay and therefore supports zero-delay applications. All inputs and outputs are LVCMOS compatible. The outputs are optimized to drive parallel terminated 50 transmission lines. Alternatively, each output can drive up to two series terminated transmission lines giving the device an effective fanout of 22. The device also supports output high-impedance disable and a PLL bypass mode for static system test and diagnosis. The MPC9352 is package in a 32 ld LQFP. Motorola, Inc. 2003 1 For More Information On This Product, Go to: www.freescale.com MPC9352 Freescale Semiconductor, Inc. CCLK CCLK FB_IN PLL_EN Ref Bank A 1 /2 1 0 /6 /4 /2 1 0 QA0 QA1 PLL FB VCO 0 QA2 QA3 QA4 Bank B QB0 QB1 F_RANGE FSELA FSELB 1 0 Freescale Semiconductor, Inc... QB2 QB3 1 FSELC Bank C QC0 QC1 0 MR/OE (all input resistors have a value of 25kW) Figure 1. MPC9352 Logic Diagram GND 24 VCC QB2 QB3 GND GND QC0 QC1 VCC 25 26 27 28 29 30 31 32 1 23 22 21 20 19 18 GND 17 16 15 14 13 VCC QA2 QA1 GND QA0 VCC VCCA PLL_EN 12 11 10 9 8 FB_IN VCC VCC QB1 QB0 QA4 6 CCLK MPC9352 2 3 4 5 F_RANGE FSELC FSELB FSELA It is recommended to use an external RC filter for the analog power supply pin VCCA. Please see application section for details. Figure 2. MPC9352 32-Lead Package Pinout (Top View) MOTOROLA For More Information On This Product, Go to: www.freescale.com 2 MR/OE GND QA3 7 TIMING SOLUTIONS Freescale Semiconductor, Inc. Table 1: PIN CONFIGURATION Pin CCLK FB_IN F_RANGE FSELA FSELB FSELC PLL_EN MR/OE QA0-4, QB0-3, QC0-1 GND VCCA Input Input Input Input Input Input Input Input Output Supply Supply I/O Type LVCMOS LVCMOS LVCMOS LVCMOS LVCMOS LVCMOS LVCMOS LVCMOS LVCMOS Ground VCC PLL reference clock signal PLL feedback signal input, connect to an output PLL frequency range select Frequency divider select for bank A outputs Frequency divider select for bank B outputs Frequency divider select for bank C outputs PLL enable/disable Output enable/disable (high-impedance tristate) and device reset Clock outputs Negative power supply Function MPC9352 Freescale Semiconductor, Inc... PLL positive power supply (analog power supply). It is recommended to use an external RC filter for the analog power supply pin VCCA. Please see applications section for details. Positive power supply for I/O and core VCC Supply VCC Table 2: FUNCTION TABLE Control Default 0 1 F_RANGE, FSELA, FSELB, and FSELC control the operating PLL frequency range and input/output frequency ratios. See Table 1 and Table 2 for supported frequency ranges and output to input frequency ratios. F_RANGE FSELA FSELB FSELC MR/OE 0 0 0 0 0 VCO / 1 (High input frequency range) Output divider / 4 Output divider / 4 Output divider / 2 Outputs enabled (active) VCO / 2 (Low input frequency range) Output divider / 6 Output divider / 2 Output divider / 4 Outputs disabled (high-impedance state) and reset of the device. During reset, the PLL feedback loop is open and the VCO is operating at its lowest frequency. The MPC9352 requires reset at power-up and after any loss of PLL lock. Loss of PLL lock may occur when the external feedback path is interrupted. The length of the reset pulse should be greater than two reference clock cycles (CCLK). Test mode with PLL disabled. CCLK is substituted for the internal VCO output. MPC9352 is fully static and no minimum frequency limit applies. All PLL related AC characteristics are not applicable. PLL_EN 0 Normal operation mode with PLL enabled. TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 3 MOTOROLA MPC9352 Freescale Semiconductor, Inc. Table 3: GENERAL SPECIFICATIONS Symbol VTT MM HBM LU CPD CIN Characteristics Output Termination Voltage ESD Protection (Machine Model) ESD Protection (Human Body Model) Latch-Up Immunity Power Dissipation Capacitance Input Capacitance 200 2000 200 10 4.0 Min Typ VCC B 2 Max Unit V V V mA pF pF Per output Inputs Condition Table 4: ABSOLUTE MAXIMUM RATINGSa Symbol VCC VIN VOUT IIN IOUT TS Supply Voltage DC Input Voltage DC Output Voltage DC Input Current DC Output Current Storage Temperature -65 Characteristics Min -0.3 -0.3 -0.3 Max 3.6 VCC+0.3 VCC+0.3 20 50 125 Unit V V V mA mA C Condition Freescale Semiconductor, Inc... a. Absolute maximum continuous ratings are those maximum values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation at absolute-maximum-rated conditions is not implied. Table 5: DC CHARACTERISTICS (VCC = 3.3V 5%, TA = -40 to 85C) Symbol VIH VIL VOH VOL ZOUT IIN ICCA ICCQc a b c Characteristics Input high voltage Input low voltage Output High Voltage Output Low Voltage Output impedance Input Currentb Maximum PLL Supply Current Maximum Quiescent Supply Current 3.0 14 - 17 200 5.0 1.0 2.4 0.55 0.30 Min 2.0 Typ Max VCC + 0.3 0.8 Unit V V V V V W A mA mA VIN=VCC or VIN=GND VCCA Pin All VCC Pins Condition LVCMOS LVCMOS IOH=-24 mAa IOL= 24 mA IOL= 12 mA The MPC9352 is capable of driving 50 transmission lines on the incident edge. Each output drives one 50 parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up to two 50 series terminated transmission lines. Inputs have pull-down resistors affecting the input current. ICCQ is the DC current consumption of the device with all outputs open in high impedance state and the inputs in its default state or open. MOTOROLA For More Information On This Product, Go to: www.freescale.com 4 TIMING SOLUTIONS Freescale Semiconductor, Inc. Table 6: AC CHARACTERISTICS (VCC = 3.3V 5%, TA = -40 to 85C)a Symbol fref Characteristics Input reference frequency in PLL modeb /4 feedback /6 feedback /8 feedback /12 feedback Min 50.0 33.3 25.0 16.67 Typ Max 100.0 66.6 50.0 33.3 250.0 200 /2 outpute /4 output /6 output /8 output /12 output 100 50 33.3 25 16.67 25 fref > 40 MHz fref < 40 MHz -50 -200 400 200 100 66.6 50 33.3 75 1.0 +150 +150 200 200 100 100 47 0.1 50 53 1.0 8 10 400 250 100 200 150 75 15 20 18 - 20 25 3.0 - 10.0 1.5 - 6.0 1.0 - 3.5 0.5 - 2.0 10 Unit MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz % ns ps ps ps ps ps ps % ns ns ns ps ps ps ps ps ps ps ps ps ps MHz MHz MHz MHz ms MPC9352 Condition Input reference frequency in PLL bypass modec fVCO fMAX VCO lock frequency Output Frequency ranged frefDC tr, tf Reference Input Duty Cycle CCLK Input Rise/Fall Time Propagation Delay CCLK to FB_IN (static phase offset) Output-to-output Skewf 0.8 to 2.0V PLL locked Freescale Semiconductor, Inc... t() tsk(O) all outputs, any frequency within QA output bank within QB output bank within QC output bank DC tr, tf tPLZ, HZ tPZL, LZ tJIT(CC) Output duty cycle Output Rise/Fall Time Output Disable Time Output Enable Time Cycle-to-cycle jitter output frequencies mixed outputs are in any /4 and /6 combination all outputs same frequency 0.55 to 2.4V tJIT(PER) Period Jitter output frequencies mixed outputs are in any /4 and /6 combination all outputs same frequency /4 feedback divider RMS (1 )g /6 feedback divider RMS (1 ) /8 feedback divider RMS (1 ) /12 feedback divider RMS (1 ) /4 feedback /6 feedback /8 feedback /12 feedback tJIT() I/O Phase Jitter BW PLL closed loop bandwidthh tLOCK a b c d e f g h Maximum PLL Lock Time AC characteristics apply for parallel output termination of 50 to VTT. PLL mode requires PLL_EN=0 to enable the PLL and zero-delay operation. It is not recommended to use a /2 divider for feedback. In PLL bypass mode, the MPC9352 divides the input reference clock. The input frequency fref on CCLK must match the VCO frequency range divided by the feedback divider ratio FB: fref = fVCO / FB. See Table 9 and Table 10 for output divider configurations. See application section for part-to-part skew calculation. See application section for a jitter calculation for other confidence factors than 1 s. -3 dB point of PLL transfer characteristics. TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 5 MOTOROLA MPC9352 Freescale Semiconductor, Inc. Table 7: DC CHARACTERISTICS (VCC = 2.5V 5%, TA = -40 to 85C) Symbol VIH VIL VOH VOL ZOUT IIN ICCA ICCQb a Characteristics Input high voltage Input low voltage Output High Voltage Output Low Voltage Output impedance Input Current Maximum PLL Supply Current Maximum Quiescent Supply Current 2.0 17 - 20 200 5.0 1.0 Min 1.7 -0.3 1.8 0.6 Typ Max VCC + 0.3 0.7 Unit V V V V W A mA mA VIN=VCC or GND VCCA Pin All VCC Pins Condition LVCMOS LVCMOS IOH=-15 mAa IOL= 15 mA b The MPC9352 is capable of driving 50 transmission lines on the incident edge. Each output drives one 50 parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up to two 50 series terminated transmission lines per output. ICCQ is the DC current consumption of the device with all outputs open in high impedance state and the inputs in its default state or open. Freescale Semiconductor, Inc... MOTOROLA For More Information On This Product, Go to: www.freescale.com 6 TIMING SOLUTIONS Freescale Semiconductor, Inc. Table 8: AC CHARACTERISTICS (VCC = 2.5V 5%, TA = -40 to 85C)a Symbol fref Characteristics Input reference frequency in PLL modeb /4 feedback /6 feedback /8 feedback /12 feedback Min 50.0 33.3 25.0 16.67 Typ Max 100.0 66.6 50.0 33.3 250.0 200 /2 outpute /4 output /6 output /8 output /12 output 100 50 33.3 25 16.67 25 fref > 40 MHz fref < 40 MHz -50 -200 400 200 100 66.6 50 33.3 75 1.0 +150 +150 200 200 100 100 47 0.1 50 53 1.0 8 10 400 250 100 200 150 75 15 20 18 - 20 25 1.0 - 8.0 0.7 - 3.0 0.5 - 2.5 0.4 - 1.0 10 Unit MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz MHz % ns ps ps ps ps ps ps % ns ns ns ps ps ps ps ps ps ps ps ps ps MHz MHz MHz MHz ms MPC9352 Condition Input reference frequency in PLL bypass modec fVCO fMAX VCO lock frequency Output Frequency ranged frefDC tr, tf Reference Input Duty Cycle CCLK Input Rise/Fall Time Propagation Delay CCLK to FB_IN (static phase offset) Output-to-output Skewf 0.8 to 2.0V PLL locked Freescale Semiconductor, Inc... t() tsk(O) all outputs, any frequency within QA output bank within QB output bank within QC output bank DC tr, tf tPLZ, HZ tPZL, ZH tJIT(CC) Output duty cycle Output Rise/Fall Time Output Disable Time Output Enable Time Cycle-to-cycle jitter output frequencies mixed outputs are in any /4 and /6 combination all outputs same frequency 0.6 to 1.8V tJIT(PER) Period Jitter output frequencies mixed outputs are in any /4 and /6 combination all outputs same frequency /4 feedback divider RMS (1 )g /6 feedback divider RMS (1 ) /8 feedback divider RMS (1 ) /12 feedback divider RMS (1 ) /4 feedback /6 feedback /8 feedback /12 feedback tJIT() I/O Phase Jitter BW PLL closed loop bandwidthh tLOCK a b c d e f g h Maximum PLL Lock Time AC characteristics apply for parallel output termination of 50 to VTT. PLL mode requires PLL_EN=0 to enable the PLL and zero-delay operation. It is not recommended to use a /2 divider for feedback. In PLL bypass mode, the MPC9352 divides the input reference clock. The input frequency fref on CCLK must match the VCO frequency range divided by the feedback divider ratio FB: fref = fVCO / FB. See Table 9 and Table 10 for output divider configurations. See application section for part-to-part skew calculation. See application section for a jitter calculation for other confidence factors than 1 s. -3 dB point of PLL transfer characteristics. TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 7 MOTOROLA MPC9352 Freescale Semiconductor, Inc. APPLICATIONS INFORMATION Programming the MPC9352 The MPC9352 supports output clock frequencies from 16.67 to 200 MHz. Different feedback and output divider configurations can be used to achieve the desired input to output frequency relationship. The feedback frequency and divider should be used to situate the VCO in the frequency lock range between 200 and 400 MHz for stable and optimal operation. The FSELA, FSELB, FSELC pins select the Table 9: MPC9352 Example Configuration (F_RANGE = 0) PLL Feedback VCO / 4b frefa [MHz] 50-100 FSELA 0 0 1 1 VCO / 6c 33.3-66.67 1 1 1 1 a. b. c. FSELB 0 0 0 0 0 0 1 1 FSELC 0 1 0 1 0 1 0 1 desired output clock frequencies. Possible frequency ratios of the reference clock input to the outputs are 1:1, 1:2, 1:3, 3:2 as well as 2:3, 3:1 and 2:1. Table 1 illustrates the various output configurations and frequency ratios supported by the MPC9352. See also Table 9, Table 10 and Figure 3 to Figure 6 for further reference. A /2 output divider cannot be used for feedback. QA[0:4]:fref ratio fref fref (50-100 MHz) (50-100 MHz) QB[0:3]:fref ratio fref fref fref fref (50-100 MHz) (50-100 MHz) (50-100 MHz) (50-100 MHz) QC[0:1]:fref ratio fref 2 (100-200 MHz) fref fref (50-100 MHz) (50-100 MHz) fref 2 (100-200 MHz) fref 3 (100-200 MHz) fref 3/2 (50-100 MHz) fref 3 (100-200 MHz) fref 3/2 (50-100 MHz) Freescale Semiconductor, Inc... fref 2/3 (33-66 MHz) fref 2/3 (33-66 MHz) fref fref fref fref (33-66 MHz) (33-66 MHz) (33-66 MHz) (33-66 MHz) fref 3/2 (50-100 MHz) fref 3/2 (50-100 MHz) fref 3 (100-200 MHz) fref 3 (100-200 MHz) fref is the input clock reference frequency (CCLK) QAx connected to FB_IN and FSELA=0 QAx connected to FB_IN and FSELA=1 Table 10: MPC9352 Example Configurations (F_RANGE = 1) PLL Feedback VCO / 8b frefa [MHz] 25-50 FSELA 0 0 1 1 VCO / 12c 16.67-33.3 1 1 1 1 a. b. c. FSELB 0 0 0 0 0 0 1 1 FSELC 0 1 0 1 0 1 0 1 QA[0:4]:fref ratio fref fref (25-50 MHz) (25-50 MHz) QB[0:3]:fref ratio fref fref fref fref (25-50 MHz) (25-50 MHz) (25-50 MHz) (25-50 MHz) QC[0:1]:fref ratio fref 2 (50-100 MHz) fref fref (25-50 MHz) (25-50 MHz) fref 2 (50-100 MHz) fref 3 (50-100 MHz) fref 3/2 (25-50 MHz) fref 3 (50-100 MHz) fref 3/2 (25-50 MHz) fref 2/3 (16-33 MHz) fref 2/3 (16-33 MHz) fref fref fref fref (16-33 MHz) (16-33 MHz) (16-33 MHz) (16-33 MHz) fref 3/2 (25-50 MHz) fref 3/2 (25-50 MHz) fref 3 (50-100 MHz) fref 3 (50-100 MHz) fref is the input clock reference frequency (CCLK) QAx connected to FB_IN and FSELA=0 QAx connected to FB_IN and FSELA=1 MOTOROLA For More Information On This Product, Go to: www.freescale.com 8 TIMING SOLUTIONS Freescale Semiconductor, Inc. Example Configurations for the MPC9352 Figure 3. MPC9352 Default Configuration QA0 QA1 QA2 QA3 QA4 QB0 QB1 QB2 QB3 QC0 QC1 MPC9352 Figure 4. MPC9352 Zero Delay Buffer Configuration QA0 QA1 QA2 QA3 QA4 QB0 QB1 QB2 QB3 QC0 QC1 fref = 100 MHz CCLK fref = 62.5 MHz 100 MHz CCLK 62.5 MHz FB_IN FSELA FSELB FSELD F_RANGE MPC9352 FB_IN 100 MHz FSELA FSELB FSELC F_RANGE MPC9352 VCC 62.5 MHz 200 MHz 62.5 MHz Freescale Semiconductor, Inc... 100 MHz (Feedback) 62.5 MHz (Feedback) MPC9352 default configuration (feedback of QB0 = 100 MHz). All control pins are left open. Frequency range Input QA outputs QB outputs QC outputs Min 50 MHz 50 MHz 50 MHz 100 MHz Max 100 MHz 10 MHz 100 MHz 200 MHz MPC9352 zero-delay (feedback of QB0 = 62.5 MHz). All control pins are left open except FSELC = 1. All outputs are locked in frequency and phase to the input clock. Frequency range Input QA outputs QB outputs QC outputs Min 50 MHz 50 MHz 50 MHz 50 MHz Max 100 MHz 10 MHz 100 MHz 100 MHz Figure 5. MPC9352 Default Configuration fref = 33.3 MHz CCLK QA0 QA1 QA2 QA3 QA4 QB0 QB1 QB2 QB3 QC0 QC1 Figure 6. MPC9352 Zero Delay Buffer Config. 2 fref = 33.3 MHz CCLK QA0 QA1 QA2 QA3 QA4 QB0 QB1 QB2 QB3 QC0 QC1 33.3 MHz FB_IN 50 MHz FSELA FSELB FSELC F_RANGE MPC9352 33.3 MHz FB_IN VCC VCC VCC FSELA FSELB FSELC F_RANGE MPC9352 VCC VCC 33.3 MHz 100 MHz 33.3 MHz 33.3 MHz (Feedback) 33.3 MHz (Feedback) MPC9352 configuration to multiply the reference frequency by 3, 3/2 and 1. PLL feedback of QA4 = 33.3 MHz. MPC9352 zero-delay (feedback of QB0 = 33.3 MHz). Equivalent to Table 2 except F_RANGE = 1 enabling a lower input and output clock frequency. Frequency range Input QA outputs QB outputs QC outputs Min 25 MHz 25 MHz 25 MHz 25 MHz Max 50 MHz 50 MHz 50 MHz 50 MHz Frequency range Input QA outputs QB outputs QC outputs Min 25 MHz 50 MHz 50 MHz 100 MHz Max 50 MHz 10 MHz 100 MHz 200 MHz TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 9 MOTOROLA MPC9352 Power Supply Filtering Freescale Semiconductor, Inc. supply noise. The power supply filter schemes discussed in this section should be adequate to eliminate power supply noise related problems in most designs. Using the MPC9352 in zero-delay applications Nested clock trees are typical applications for the MPC9352. Designs using the MPC9352 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 MPC9352 clock driver allows for its use as a zero delay buffer. One example configuration is to use a /4 output as a feedback to the PLL and configuring all other outputs to a divide-by-4 mode. 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 The MPC9352 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 MPC9352 are connected together, the maximum overall timing uncertainty from the common CCLK input to any output is: tSK(PP) = t( ) + tSK(O) + tPD, LINE(FB) + tJIT( ) CF This maximum timing uncertainty consist of 4 components: static phase offset, output skew, feedback board trace delay and I/O (phase) jitter: Freescale Semiconductor, Inc... The MPC9352 is a mixed analog/digital product. Its analog circuitry is naturally susceptible to random noise, especially if this noise is seen on the power supply pins. Random noise on the VCCA (PLL) power supply impacts the device characteristics, for instance I/O jitter. The MPC9352 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 digital system environment where it is more difficult to minimize noise on the power supplies a second level of isolation may be required. The simple but effective form of isolation is a power supply filter on the VCCA pin for the MPC9352. Figure 7. illustrates a typical power supply filter scheme. The MPC9352 frequency and phase stability is most susceptible to noise with spectral content in the 100kHz to 20MHz 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 across the series filter resistor RF. From the data sheet the ICCA current (the current sourced through the VCCA pin) is typically 3 mA (5 mA maximum), assuming that a minimum of 2.325V (VCC=3.3V or VCC=2.5V) must be maintained on the VCCA pin. The resistor RF shown in Figure 7. "VCCA Power Supply Filter" should have a resistance of 5-15W (VCC=3.3V) or 9-10W (VCC=2.5V) to meet the voltage drop criteria. RF = 5-15 for VCC = 3.3V RF = 9-10 for VCC = 2.5V RF CF 10 nF CF = 22 F for VCC = 3.3V CF = 22 F for VCC = 2.5V VCC VCCA MPC9352 VCC 33...100 nF CCLKCommon t() tPD,LINE(FB) Figure 7. VCCA Power Supply Filter The minimum values for RF and the filter capacitor CF are defined by the required filter characteristics: the RC filter should provide an attenuation greater than 40 dB for noise whose spectral content is above 100 kHz. In the example RC filter shown in Figure 7. "VCCA Power Supply Filter", the filter cut-off frequency is around 3-5 kHz and the noise attenuation at 100 kHz is better than 42 dB. As the noise frequency crosses the series resonant point of an individual capacitor its 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. Although the MPC9352 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 QFBDevice 1 tJIT() +tSK(O) +t() Any QDevice 1 QFBDevice2 tJIT() +tSK(O) tSK(PP) Any QDevice 2 Max. skew Figure 8. MPC9352 max. device-to-device skew Due to the statistical nature of I/O jitter a RMS value (1 s) is specified. I/O jitter numbers for other confidence factors (CF) can be derived from Table 11. MOTOROLA For More Information On This Product, Go to: www.freescale.com 10 TIMING SOLUTIONS Freescale Semiconductor, Inc. Table 11: Confidence Facter CF CF 1s 2s 3s 4s 5s 6s Probability of clock edge within the distribution 0.68268948 0.95449988 0.99730007 0.99993663 0.99999943 0.99999999 MPC9352 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 MPC9352 clock driver. For the series terminated case however there is no DC current draw, thus the outputs can drive multiple series terminated lines. Figure 10. "Single versus Dual Transmission Lines" illustrates an output driving a single series terminated line versus two series terminated lines in parallel. When taken to its extreme the fanout of the MPC9352 clock driver is effectively doubled due to its capability to drive multiple lines. MPC9352 OUTPUT BUFFER IN 14 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% ( 3s) is assumed, resulting in a worst case timing uncertainty from input to any output of -445 ps to 395 ps relative to CCLK: RS = 36 ZO = 50 OutA Freescale Semiconductor, Inc... tSK(PP) = tSK(PP) = [-200ps...150ps] + [-200ps...200ps] + [(15ps @ -3)...(15ps @ 3)] + tPD, LINE(FB) [-445ps...395ps] + tPD, LINE(FB) IN MPC9352 OUTPUT BUFFER 14 RS = 36 ZO = 50 OutB0 Due to the frequency dependence of the I/O jitter, Figure 9. "Max. I/O Jitter versus frequency" can be used for a more precise timing performance analysis. RS = 36 ZO = 50 OutB1 Figure 10. Single versus Dual Transmission Lines The waveform plots in Figure 11. "Single versus Dual Line Termination Waveforms" show the simulation results of an output driving a single line versus two lines. In both cases the drive capability of the MPC9352 output buffer is more than sufficient to drive 50 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 MPC9352. The output waveform in Figure 11. "Single versus Dual Line Termination Waveforms" shows a step in the waveform, this step is caused by the impedance mismatch seen looking into the driver. The parallel combination of the 36 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: = VS ( Z0 / (RS+R0 +Z0)) = 50 || 50 = 36 || 36 = 14 = 3.0 ( 25 / (18+17+25) = 1.31V At the load end the voltage will double, due to the near unity reflection coefficient, to 2.6V. It will then increment towards the quiescent 3.0V in steps separated by one round trip delay (in this case 4.0ns). VL Z0 RS R0 VL Figure 9. Max. I/O Jitter versus frequency Driving Transmission Lines The MPC9352 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 20 the drivers can drive either parallel or series terminated transmission lines. For more information on transmission lines the reader is referred to Motorola application note AN1091. 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 50 resistance to VCC/2. TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 11 MOTOROLA MPC9352 3.0 2.5 2.0 1.5 1.0 0.5 0 OutA tD = 3.8956 Freescale Semiconductor, Inc. match the impedances when driving multiple lines the situation in Figure 12. "Optimized Dual Line Termination" 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. MPC9352 OUTPUT BUFFER 14 OutB tD = 3.9386 VOLTAGE (V) In RS = 22 ZO = 50 RS = 22 ZO = 50 Freescale Semiconductor, Inc... 2 4 6 8 TIME (nS) 10 12 14 14 + 22 k 22 = 50 k 50 25 = 25 Figure 12. Optimized Dual Line Termination Figure 11. 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 MPC9352 DUT Pulse Generator Z = 50W ZO = 50 ZO = 50 RT = 50 VTT RT = 50 VTT Figure 13. CCLK MPC9352 AC test reference for Vcc = 3.3V and Vcc = 2.5V MOTOROLA For More Information On This Product, Go to: www.freescale.com 12 TIMING SOLUTIONS Freescale Semiconductor, Inc. VCC VCCB2 GND VCC VCCB2 GND tSK(O) The pin-to-pin skew is defined as the worst case difference in propagation delay between any similar delay path within a single device CCLK MPC9352 VCC VCCB2 GND VCC VCCB2 GND t() FB_IN Figure 14. Output-to-output Skew tSK(O) VCC VCCB2 GND tP T0 DC = tP /T0 x 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. Propagation delay (t(), static phase offset) test reference CCLK Freescale Semiconductor, Inc... FB_IN TJIT() = |T0 -T1 mean| The deviation in t0 for a controlled edge with respect to a t0 mean in a random sample of cycles Figure 16. Output Duty Cycle (DC) Figure 17. I/O Jitter TN TN+1 TJIT(CC) = |TN -TN+1 | T0 TJIT(PER) = |TN -1/f0 | The variation in cycle time of a signal between adjacent cycles, over a random sample of adjacent cycle pairs The deviation in cycle time of a signal with respect to the ideal period over a random sample of cycles Figure 18. Cycle-to-cycle Jitter Figure 19. Period Jitter VCC=3.3V 2.4 0.55 tF tR VCC=2.5V 1.8V 0.6V Figure 20. Output Transition Time Test Reference TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 13 MOTOROLA MPC9352 Freescale Semiconductor, Inc. OUTLINE DIMENSIONS FA SUFFIX LQFP PACKAGE CASE 873A-02 ISSUE A A 32 4X 25 A1 0.20 (0.008) AB T-U Z 1 -T- B B1 8 -U- V DETAIL Y 17 V1 Freescale Semiconductor, Inc... 9 -Z- 9 S1 S 4X 0.20 (0.008) AC T-U Z NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DATUM PLANE -AB- IS LOCATED AT BOTTOM OF LEAD AND IS COINCIDENT WITH THE LEAD WHERE THE LEAD EXITS THE PLASTIC BODY AT THE BOTTOM OF THE PARTING LINE. 4. DATUMS -T-, -U-, AND -Z- TO BE DETERMINED AT DATUM PLANE -AB-. 5. DIMENSIONS S AND V TO BE DETERMINED AT SEATING PLANE -AC-. 6. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. ALLOWABLE PROTRUSION IS 0.250 (0.010) PER SIDE. DIMENSIONS A AND B DO INCLUDE MOLD MISMATCH AND ARE DETERMINED AT DATUM PLANE -AB-. 7. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. DAMBAR PROTRUSION SHALL NOT CAUSE THE D DIMENSION TO EXCEED 0.520 (0.020). 8. MINIMUM SOLDER PLATE THICKNESS SHALL BE 0.0076 (0.0003). 9. EXACT SHAPE OF EACH CORNER MAY VARY FROM DEPICTION. -T-, -U-, -Z- G -AB- SEATING PLANE DETAIL AD -AC- 0.10 (0.004) AC AE 8X M_ R P AE CE DETAIL Y GAUGE PLANE 0.250 (0.010) H W X DETAIL AD K Q_ BASE METAL N F D J SECTION AE-AE MOTOROLA For More Information On This Product, Go to: www.freescale.com 14 0.20 (0.008) M AC T-U Z DIM A A1 B B1 C D E F G H J K M N P Q R S S1 V V1 W X MILLIMETERS MIN MAX 7.000 BSC 3.500 BSC 7.000 BSC 3.500 BSC 1.400 1.600 0.300 0.450 1.350 1.450 0.300 0.400 0.800 BSC 0.050 0.150 0.090 0.200 0.500 0.700 12_ REF 0.090 0.160 0.400 BSC 1_ 5_ 0.150 0.250 9.000 BSC 4.500 BSC 9.000 BSC 4.500 BSC 0.200 REF 1.000 REF INCHES MIN MAX 0.276 BSC 0.138 BSC 0.276 BSC 0.138 BSC 0.055 0.063 0.012 0.018 0.053 0.057 0.012 0.016 0.031 BSC 0.002 0.006 0.004 0.008 0.020 0.028 12_ REF 0.004 0.006 0.016 BSC 1_ 5_ 0.006 0.010 0.354 BSC 0.177 BSC 0.354 BSC 0.177 BSC 0.008 REF 0.039 REF EE EE EE TIMING SOLUTIONS Freescale Semiconductor, Inc. NOTES MPC9352 Freescale Semiconductor, Inc... TIMING SOLUTIONS For More Information On This Product, Go to: www.freescale.com 15 MOTOROLA MPC9352 Freescale Semiconductor, Inc. Freescale Semiconductor, Inc... Information in this document is provided solely to enable system and software implementers to use Motorola products. There are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters that may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals", must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. MOTOROLA and the Stylized M Logo are registered in the US Patent and Trademark Office. All other product or service names are the property of their respective owners. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. E Motorola Inc. 2003 HOW TO REACH US: USA/EUROPE/LOCATIONS NOT LISTED: Motorola Literature Distribution P.O. Box 5405, Denver, Colorado 80217 1-800-521-6274 or 480-768-2130 JAPAN: Motorola Japan Ltd.; SPS, Technical Information Center, 3-20-1, Minami-Azabu, Minato-ku, Tokyo 106-8573, Japan 81-3-3440-3569 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Centre, 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong 852-26668334 HOME PAGE: http://motorola.com/semiconductors MOTOROLA 16 For More Information On This Product, Go to: www.freescale.com MPC9352/D TIMING SOLUTIONS |
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