MPC93R51AC

Freescale Semiconductor Technical Data Low Voltage PLL Clock Driver The MPC93R51 is a 3.3 V compatible, PLL based clock generator targeted for high performance clock distribution systems. With output frequencies of up to 240 MHz and a maximum output skew of 150 ps, the MPC93R51 is an ideal solution for the most demanding clock tree designs. The device offers 9 low skew clock outputs, each is configurable to support the clocking needs of the various high-performance microprocessors including the PowerQuicc II integrated communication microprocessor. The devices employ a fully differential PLL design to minimize cycle-to-cycle and long-term jitter. MPC93R51 Rev. 4, 1/2005 MPC93R51 LOW VOLTAGE 3.3 V PLL CLOCK GENERATOR Features • • • • • • • • • • • • • • • 9 outputs LVCMOS PLL clock generator 25–240 MHz output frequency range Fully integrated PLL Compatible to various microprocessors such as PowerQuicc II Supports networking, telecommunications and computer applications Configurable outputs: divide-by-2, 4 and 8 of VCO frequency LVPECL and LVCMOS compatible inputs External feedback enables zero-delay configurations Output enable/disable and static test mode (PLL enable/disable) Low skew characteristics: maximum 150 ps output-to-output Cycle-to-cycle jitter max. 22 ps RMS 32-lead LQFP package 32-lead Pb-free Package Available Ambient Temperature Range 0°C to +70°C Pin & Function Compatible with the MPC951 FA SUFFIX 32-LEAD LQFP PACKAGE CASE 873A-03 AC SUFFIX 32-LEAD LQFP PACKAGE Pb-FREE PACKAGE CASE 873A-03 Functional Description The MPC93R51 utilizes PLL technology to frequency and phase lock its outputs onto an input reference clock. Normal operation of the MPC93R51 requires a connection of one of the device outputs to the EXT_FB input to close the PLL feedback path. The reference clock frequency and the output divider for the feedback path determine the VCO frequency. Both must be selected to match the VCO frequency range. With available output dividers of divide-by-4 and divide-by-8, the internal VCO of the MPC93R51 is running at either 4x or 8x of the reference clock frequency. The frequency of the QA, QB, QC and QD outputs is either the one half, one fourth or one eighth of the selected VCO frequency and can be configured for each output bank using the FSELA, FSELB, FSELC and FSELD pins, respectively. The available output to input frequency ratios are 4:1, 2:1, 1:1, 1:2 and 1:4. The REF_SEL pin selects the differential LVPECL (PCLK and PCLK) or the LVCMOS compatible reference input (TCLK). The MPC93R51 also provides a static test mode when the PLL enable pin (PLL_EN) is pulled to logic low state. In test mode, the selected input reference clock is routed directly to the output dividers bypassing the PLL. The test mode is intended for system diagnostics, test and debug purposes. This test mode is fully static and the minimum clock frequency specification does not apply. The outputs can be disabled by deasserting the OE pin (logic high state). In PLL mode, deasserting OE causes the PLL to loose lock due to no feedback signal presence at EXT_FB. Asserting OE will enable the outputs and close the phase locked loop, also enabling the PLL to recover to normal operation. The MPC93R51 is 3.3 V compatible and requires no external loop filter components. All inputs except PCLK and PCLK accept LVCMOS signals while the outputs provide LVCMOS compatible levels with the capability to drive terminated 50 Ω transmission lines. For series terminated transmission lines, each of the MPC93R51 outputs can drive one or two traces giving the devices an effective fanout of 1:18. The device is packaged in a 7x7 mm2 32-lead LQFP package. Application Information The fully integrated PLL of the MPC93R51 allows the low skew outputs to lock onto a clock input and distribute it with essentially zero propagation delay to multiple components on the board. In zero-delay buffer mode, the PLL minimizes phase offset between the outputs and the reference signal. This document contains certain information on a new product. Specifications and information herein are subject to change without notice. © Freescale Semiconductor, Inc., 2005. All rights reserved. Freescale Confidential Proprietary, NDA Required / Preliminary PCLK PCLK TCLK (Pullup) (Pulldown) REF_SEL (Pulldown) EXT_FB (Pulldown) 0 0 ÷2 Ref 1 1 PLL 0 ÷4 D Q QA D Q QB 1 ÷8 FB 0 200 – 480 MHz 1 PLL_EN (Pullup) QC0 0 FSELA FSELB (Pulldown) FSELC (Pulldown) FSELD (Pulldown) D Q QC1 1 (Pulldown) QD0 QD1 0 D Q QD2 1 QD3 QD4 OE (Pulldown) The MPC93R51 requires an external RC filter for the analog power supply pin VCCA. Please see application section for details. QC0 VCCO QC1 GND QD0 VCCO QD1 GND Figure 1. MPC93R51 Logic Diagram 24 23 22 21 20 19 18 17 GND 25 16 QD2 QB 26 15 VCCO VCCO 27 14 QD3 QA 28 13 GND GND 29 12 QD4 TCLK 30 11 VCCO PLL_EN 31 10 OE REF_SEL 32 MPC93R51 2 3 4 5 6 7 8 VCCA EXT_FB FSELA FSELB FSELC FSELD GND PCLK 9 1 PCLK Figure 2. Pinout: 32-Lead Package Pinout (Top View) MPC93R51 2 Advanced Clock Drivers Devices Freescale Semiconductor Table 1. Pin Description Number Name Type Description PCLK, PCLK Input LVPECL Differential clock reference Low voltage positive ECL input TCLK Input LVCMOS Single ended reference clock signal or test clock EXT_FB Input LVCMOS Feedback signal input, connect to a QA, QB, QC, QD output REF_SEL Input LVCMOS Selects input reference clock FSELA Input LVCMOS Output A divider selection FSELB Input LVCMOS Output B divider selection FSELC Input LVCMOS Outputs C divider selection FSELD Input LVCMOS Outputs D divider selection OE Input LVCMOS Output enable/disable QA Output LVCMOS Bank A clock output QB Output LVCMOS Bank B clock output QC0, QC1 Output LVCMOS Bank C clock outputs QD0 – QD4 Output LVCMOS Bank D clock outputs VCCA Supply VCC Positive power supply for the PLL VCC Supply VCC Positive power supply for I/O and core GND Supply Ground Negative power supply Table 2. Function Table Control Default 0 1 REF_SEL 0 Selects PCLK as reference clock Selects TCLK as reference clock PLL_EN 1 Test mode with PLL disabled. The input clock is directly routed to the output dividers PLL enabled. The VCO output is routed to the output dividers OE 0 Outputs enabled Outputs disabled, PLL loop is open VCO is forced to its minimum frequency FSELA 0 QA = VCO ÷ 2 QA = VCO ÷ 4 FSELB 0 QB = VCO ÷ 4 QB = VCO ÷ 8 FSELC 0 QC = VCO ÷ 4 QC = VCO ÷ 8 FSELD 0 QD = VCO ÷ 4 QD = VCO ÷ 8 Table 3. Absolute Maximum Ratings(1) Symbol Characteristics Min Max Unit VCC Supply Voltage -0.3 4.6 V VIN DC Input Voltage -0.3 VCC+0.3 V DC Output Voltage -0.3 VCC+0.3 V ±20 mA ±50 mA 150 °C VOUT IIN IOUT TS DC Input Current DC Output Current Storage Temperature -55 Condition 1. 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 under absolute-maximum-rated conditions is not implied. MPC93R51 Advanced Clock Drivers Devices Freescale Semiconductor 3 Table 4. General Specifications Symbol Characteristics Min Typ Max Unit VCC ÷ 2 VTT Output Termination Voltage MM ESD (Machine Model) 200 V HBM ESD (Human Body Model) 2000 V LU Latch-Up 200 mA CPD Power Dissipation Capacitance CIN Condition V 10 pF Per output 4.0 pF Inputs Table 5. DC Characteristics (VCC = 3.3 V ± 5%, TA = 0° to 70°C) Symbol Characteristics Min VIH Input High Voltage VIL Input Low Voltage VPP Peak-to-Peak Input Voltage PCLK, PCLK 250 Common Mode Range PCLK, PCLK 1.0 VCMR(1) VOH Output High Voltage VOL Output Low Voltage ZOUT Output Impedance Typ 2.0 Max Unit VCC + 0.3 V LVCMOS 0.8 VCC–0.6 2.4 0.55 0.30 Condition V LVCMOS mV LVPECL V LVPECL V IOH = –24 mA(2) V V IOL = 24 mA IOL = 12 mA Ω 14 –17 ±150 µA VIN = VCC or GND ICCA Maximum PLL Supply Current 3.0 5.0 mA VCCA Pin ICCQ Maximum Quiescent Supply Current 7.0 10 mA All VCC Pins IIN Input Leakage Current 1. VCMR (DC) is the crosspoint of the differential input signal. Functional operation is obtained when the crosspoint is within the VCMR range and the input swing lies within the VPP (DC) specification. 2. The MPC93R51 is capable of driving 50 Ω transmission lines on the incident edge. Each output drives one 50 Ω parallel terminated transmission line to a termination voltage of VTT. Alternatively, the device drives up to two 50 Ω series terminated transmission lines. MPC93R51 4 Advanced Clock Drivers Devices Freescale Semiconductor Table 6. AC Characteristics (VCC = 3.3 V ± 5%, TA = 0° to 70°C)(1) Symbol fref fVCO Characteristics Input Frequency(2) Min ÷ 4 feedback ÷ 8 feedback Static test mode VCO Frequency 2 ÷ 2 output ÷ 4 output ÷ 8 output Typ Max Unit 50 25 0 120 60 300 MHz MHz MHz 200 480 MHz 100 50 25 240 120 60 MHz MHz MHz 25 75 % Condition PLL_EN = 1 PLL_EN = 1 PLL_EN = 0 fMAX Maximum Output Frequency frefDC Reference Input Duty Cycle VPP Peak-to-Peak Input Voltage PCLK, PCLK 500 1000 mV LVPECL Common Mode Range PCLK, PCLK 1.2 VCC–0.9 V LVPECL 1.0 ns 0.8 to 2.0 V +150 +325 ps ps PLL locked PLL locked 150 ps 55 52.5 51.75 % % % 1.0 ns 7.0 ns VCMR(3) tr, tf (4) TCLK Input Rise/Fall Time t(∅) Propagation Delay (static phase offset) TCLK to EXT_FB PCLK to EXT_FB tsk(o) Output-to-Output Skew DC Output Duty Cycle tr, tf Output Rise/Fall Time tPLZ, HZ Output Disable Time tPZL, ZH Output Enable Time BW PLL closed loop bandwidth 100 – 240 MHz 50 – 120 MHz 25 – 60 MHz -50 +25 45 47.5 48.75 50 50 50 0.1 6.0 ÷ 4 feedback ÷ 8 feedback 3.0 – 9.5 1.2 – 2.1 0.55 to 2.4 V ns MHz MHz –3 db point of PLL transfer characteristic tJIT(CC) Cycle-to-cycle jitter ÷ 4 feedback Single Output Frequency Configuration 10 22 ps RMS value tJIT(PER) Period Jitter ÷ 4 feedback Single Output Frequency Configuration 8.0 15 ps RMS value ps RMS value tJIT(∅) I/O Phase Jitter tLOCK Maximum PLL Lock Time 4.0 – 17 1.0 ms 1. AC characteristics apply for parallel output termination of 50 Ω to VTT. 2. The PLL will be unstable with a divide by 2 feedback rati,o 3. VCMR (AC) is the crosspoint of the differential input signal. Normal AC operation is obtained when the crosspoint is within the VCMR range and the input swing lies within the VPP (AC) specification. Violation of VCMR or VPP impacts static phase offset t(∅). 4. The MPC93R51 will operate with input rise/fall times up to 3.0 ns, but the AC characteristics, specifically t(∅), can only be guaranteed if tr/tf are within the specified range. MPC93R51 Advanced Clock Drivers Devices Freescale Semiconductor 5 APPLICATIONS INFORMATION Programming the MPC93R51 The MPC93R51 clock driver outputs can be configured into several divider modes. In addition, the external feedback of the device allows for flexibility in establishing various input to output frequency relationships. The output divider of the four output groups allows the user to configure the outputs into 1:1, 2:1, 4:1 and 4:2:1 frequency ratios. The use of even dividers ensure that the output duty cycle is always 50%. Table 7 illustrates the various output configurations. The table describes the outputs using the input clock frequency CLK as a reference. The output division settings establish the output relationship. In addition, it must be ensured that the VCO will be stable given the frequency of the outputs desired. The feedback frequency should be used to situate the VCO into a frequency range in which the PLL will be stable. The design of the PLL supports output frequencies from 25 MHz to 240 MHz while the VCO frequency range is specified from 200 MHz to 480 MHz and should not be exceeded for stable operation. Table 7. Output Frequency Relationship(1) for an Example Configuration Inputs Outputs FSELA FSELB FSELC FSELD QA QB QC QD 0 0 0 0 2 * CLK CLK CLK CLK 0 0 0 1 2 * CLK CLK CLK CLK ÷ 2 0 0 1 0 4 * CLK 2 * CLK CLK 2* CLK 0 0 1 1 4 * CLK 2 * CLK CLK CLK 0 1 0 0 2 * CLK CLK ÷ 2 CLK CLK 0 1 0 1 2 * CLK CLK ÷ 2 CLK CLK ÷ 2 0 1 1 0 4 * CLK CLK CLK 2 * CLK 0 1 1 1 4 * CLK CLK CLK CLK 1 0 0 0 CLK CLK CLK CLK 1 0 0 1 CLK CLK CLK CLK ÷ 2 1 0 1 0 2 * CLK 2 * CLK CLK 2 * CLK 1 0 1 1 2 * CLK 2 * CLK CLK CLK 1 1 0 0 CLK CLK ÷ 2 CLK CLK 1 1 0 1 CLK CLK ÷ 2 CLK CLK ÷ 2 1 1 1 0 2 * CLK CLK CLK 2 * CLK 1 1 1 1 2 * CLK CLK CLK CLK 1. Output frequency relationship with respect to input reference frequency CLK. QC1 is connected to EXT_FB. Using the MPC93R51 in Zero-Delay Applications Nested clock trees are typical applications for the MPC93R51. For these applications the MPC93R51 offers a differential LVPECL clock input pair as a PLL reference. This allows for the use of differential LVPECL primary clock distribution devices such as the Freescale MC100EP111 or MC10EP222, taking advantage of its superior low-skew performance. Clock trees using LVPECL for clock distribution and the MPC93R51 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 MPC93R51 PLL allows for its use as a zero delay buffer. The PLL aligns the feedback clock output edge with the clock input reference edge and virtually eliminates the propagation delay through the device. The remaining insertion delay (skew error) of the MPC93R51 in zero-delay applications is measured between the reference clock input and any output. This effective delay consists of the static phase offset (SPO or t(∅)), I/O jitter (tJIT(∅), phase or long-term jitter), feedback path delay and the output-to-output skew (tSK(O) relative to the feedback output. fref = 100 MHz TCLK 1 REF_SEL 1 1 0 0 0 PLL_EN FSELA FSELB FSELC FSELD QA QB 2 x 100 MHz QC0 QC1 2 x 100 MHz QD0 QD1 QD2 QD3 4 x 100 MHz QD4 Ext_FB MPC93R51 100 MHz (Feedback) Figure 3. MPC93R51 Zero-Delay Configuration (Feedback of QD4) MPC93R51 6 Advanced Clock Drivers Devices Freescale Semiconductor Calculation of Part-to-Part Skew The MPC93R51 zero delay buffer supports applications where critical clock signal timing can be maintained across several devices. If the reference clock inputs (TCLK or PCLK) of two or more MPC93R51 are connected together, the maximum overall timing uncertainty from the common TCLK input to any output is: the lowest VCO frequency (200 MHz for the MPC93R51). Applications using a higher VCO frequency exhibit less I/O jitter than the AC characteristic limit. The I/O jitter characteristics in Figure 5 can be used to derive a smaller I/O jitter number at the specific VCO frequency, resulting in tighter timing limits in zero-delay mode and for part-to-part skew tSK(PP). tSK(PP) = t(∅) + tSK(O) + tPD, LINE(FB) + tJIT(∅) · CF Max. I/O Jitter versus frequency This maximum timing uncertainty consists of 4 components: static phase offset, output skew, feedback board trace delay and I/O (phase) jitter. tPD,LINE(FB) —t(∅) QFBDevice 1 20 15 10 5 tJIT(∅) 0 Any QDevice 1 +tSK(O) QFBDevice2 tJIT(∅) +tSK(O) Max. skew 75 225 250 275 300 325 350 375 400 VCO frequency [MHz] Figure 5. Max. I/O Jitter (RMS) Versus Frequency for VCC = 3.3 V +t(∅) Any QDevice 2 25 tJIT(∅) [ps] ms TCLKCommon 30 tSK(PP) Figure 4. MPC93R51 Max. Device-to-Device Skew Due to the statistical nature of I/O jitter, a RMS value (1 σ) is specified. I/O jitter numbers for other confidence factors (CF) can be derived from Table 8. Table 8. Confidence Factor CF CF Probability of clock edge within the distribution ± 1σ 0.68268948 ± 2σ 0.95449988 ± 3σ 0.99730007 ± 4σ 0.99993663 ± 5σ 0.99999943 ± 6σ 0.99999999 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, an I/O jitter confidence factor of 99.7% (± 3σ) is assumed, resulting in a worst case timing uncertainty from input to any output of –251 ps to 351 ps relative to TCLK (VCC = 3.3 V and fVCO = 400 MHz): Power Supply Filtering The MPC93R51 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. Noise on the VCCA (PLL) power supply impacts the device characteristics, for instance, I/O jitter. The MPC93R51 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 MPC93R51. Figure 6 illustrates a typical power supply filter scheme. The MPC93R51 frequency and phase stability is most susceptible to noise with spectral content in the 100 kHz to 20 MHz 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 3.0 V must be maintained on the VCCA pin. The resistor RF shown in Figure 6 must have a resistance of 5-15 Ω to meet the voltage drop criteria. tSK(PP) = [-50ps...150ps] + [-150ps...150ps] + [(17ps · –3)...(17ps ·3)] + tPD, LINE(FB) tSK(PP) = [-251ps...351ps] + tPD, LINE(FB) Above equation uses the maximum I/O jitter number shown in the AC characteristic table for VCC = 3.3 V (17 ps RMS). I/O jitter is frequency dependent with a maximum at MPC93R51 Advanced Clock Drivers Devices Freescale Semiconductor 7 RF VCC MPC93R51 OUTPUT BUFFER VCCA 22 pF 0.1 µF MPC93R51 VCC IN 14Ω RS = 36Ω ZO = 50Ω RS = 36Ω ZO = 50Ω RS = 36Ω ZO = 50Ω OutA 0.1 µF MPC93R51 OUTPUT BUFFER Figure 6. VCCA Power Supply Filter 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 MPC93R51 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. Driving Transmission Lines The MPC93R51 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 Ω, the drivers can drive either parallel or series terminated transmission lines. For more information on transmission lines the reader is referred to Freescale 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 Ω 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 MPC93R51 clock driver. For the series terminated case, however, there is no DC current draw, thus the outputs can drive multiple series terminated lines. Figure 7 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 MPC93R51 clock driver is effectively doubled due to its capability to drive multiple lines. IN OutB0 14Ω OutB1 Figure 7. Single versus Dual Transmission Lines The waveform plots in Figure 8 show the simulation results of an output driving a single line versus two lines. In both cases, the drive capability of the MPC93R51 output buffer is more than sufficient to drive 50 Ω transmission lines on the incident edge. Note from the delay measurements in the simulations, a delta of only 43 ps 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 MPC93R51. The output waveform in Figure 8 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 Ω 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 (Z0 ÷ (RS+R0 +Z0)) Z0 = 50 Ω || 50 Ω RS = 36 Ω || 36 Ω R0 = 14 Ω VL = 3.0 (25 ÷ (18+17+25) = 1.31 V At the load end the voltage will double, due to the near unity reflection coefficient, to 2.6 V. It will then increment towards the quiescent 3.0 V in steps separated by one round trip delay (in this case 4.0 ns). MPC93R51 8 Advanced Clock Drivers Devices Freescale Semiconductor 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 9 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. 3.0 VOLTAGE (V) 2.5 OutA tD = 3.8956 OutB tD = 3.9386 2.0 In 1.5 MPC93R51 OUTPUT BUFFER 1.0 RS = 22Ω ZO = 50Ω RS = 22Ω ZO = 50Ω 14Ω 0.5 0 2 4 6 8 TIME (ns) 10 12 14 14Ω + 22Ω || 22Ω = 50Ω || 50Ω 25Ω = 25Ω Figure 9. Optimized Dual Line Termination Figure 8. Single versus Dual Waveforms MPC93R51 DUT Pulse Generator Z = 50Ω ZO = 50Ω ZO = 50Ω RT = 50Ω RT = 50Ω VTT VTT Figure 10. TCLK MPC93R51 AC Test Reference for VCC = 3.3 V Differential Pulse Generator Z = 50Ω ZO = 50Ω MPC93R51 DUT ZO = 50Ω RT = 50Ω VTT RT = 50Ω VTT Figure 11. PCLK MPC9R351 AC Test Reference MPC93R51 Advanced Clock Drivers Devices Freescale Semiconductor 9 PCLK VCC VCMR VCMR PCLK VCC ÷ 2 TCLK GND VCC VCC ÷ 2 Ext_FB VCC VCC ÷ 2 Ext_FB GND GND t(∅) t(∅) Figure 12. Propagation Delay (tPD, Static Phase Offset) Test Reference Figure 13. Propagation Delay (tPD) Test Reference VCC VCC ÷ 2 VCC VCC ÷ 2 GND GND tP VCC VCC ÷ 2 T0 GND DC = tP/T0 x 100% tSK(O) The time from the PLL controlled edge to the non controlled edge, divided by the time between PLL controlled edges, expressed as a percentage. The pin-to-pin skew is defined as the worst case difference in propagation delay between any similar delay path within a single device. Figure 14. Output Duty Cycle (DC) Figure 15. Output-to-Output Skew tSK(O) 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 16. Cycle-to-Cycle Jitter Figure 17. Period Jitter TCLK (PCLK) VCC=3.3 V Ext_FB 2.4 TJIT(∅) = |T0–T1mean| 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 0.55 tF tR Figure 19. Transition Time Test Reference MPC93R51 10 Advanced Clock Drivers Devices Freescale Semiconductor PACKAGE DIMENSIONS 4X 0.20 H 6 A-B D D1 PIN 1 INDEX 3 e/2 D1/2 32 A, B, D 25 1 E1/2 A F B 6 E1 E 4 F DETAIL G 8 17 9 7 NOTES: 1. DIMENSIONS ARE IN MILLIMETERS. 2. INTERPRET DIMENSIONS AND TOLERANCES PER ASME Y14.5M, 1994. 3. DATUMS A, B, AND D TO BE DETERMINED AT DATUM PLANE H. 4. DIMENSIONS D AND E TO BE DETERMINED AT SEATING PLANE C. 5. DIMENSION b DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL NOT CAUSE THE LEAD WIDTH TO EXCEED THE MAXIMUM b DIMENSION BY MORE THAN 0.08-mm. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT. MINIMUM SPACE BETWEEN PROTRUSION AND ADJACENT LEAD OR PROTRUSION: 0.07-mm. 6. DIMENSIONS D1 AND E1 DO NOT INCLUDE MOLD PROTRUSION. ALLOWABLE PROTRUSION IS 0.25-mm PER SIDE. D1 AND E1 ARE MAXIMUM PLASTIC BODY SIZE DIMENSIONS INCLUDING MOLD MISMATCH. 7. EXACT SHAPE OF EACH CORNER IS OPTIONAL. 8. THESE DIMENSIONS APPLY TO THE FLAT SECTION OF THE LEAD BETWEEN 0.1-mm AND 0.25-mm FROM THE LEAD TIP. 4 D 4X A-B D H SEATING PLANE DETAIL G D D/2 0.20 C E/2 28X e 32X C 0.1 C DETAIL AD PLATING BASE METAL b1 c c1 b 8X (θ1˚) 0.20 R R2 A2 C A-B D SECTION F-F R R1 A M 5 0.25 GAUGE PLANE A1 (S) L (L1) θ˚ DETAIL AD 8 DIM A A1 A2 b b1 c c1 D D1 e E E1 L L1 q q1 R1 R2 S MILLIMETERS MIN MAX 1.40 1.60 0.05 0.15 1.35 1.45 0.30 0.45 0.30 0.40 0.09 0.20 0.09 0.16 9.00 BSC 7.00 BSC 0.80 BSC 9.00 BSC 7.00 BSC 0.50 0.70 1.00 REF 0˚ 7˚ 12 REF 0.08 0.20 0.08 --0.20 REF CASE 873A-03 ISSUE B 32-LEAD LQFP PACKAGE MPC93R51 Advanced Clock Drivers Devices Freescale Semiconductor 11 How to Reach Us: Home Page: www.freescale.com E-mail: support@freescale.com USA/Europe or Locations Not Listed: Freescale Semiconductor Technical Information Center, CH370 1300 N. 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