Freescale Semiconductor, Inc. MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MPC905/D DATA SHEET MPC905 1:6 PCI Clock Generator/Fanout 1:6 PCI Clock Generator/ Buffer MPC905 Fanout Buffer Freescale Semiconductor, Inc... The MPC905 is a six output clock generation device targeted to provide the clocks required in a 3.3V or 5.0V PCI environment. The device operates from a 3.3V supply and can interface to either a TTL input or an external crystal. The inputs to the device can be driven with 5.0V when the VCC is at 3.3V. The outputs of the MPC905 meet all of the specifications of the PCI standard. • • • • • • Six Low Skew Outputs 1:6 PCI CLOCK GENERATOR/ FANOUT BUFFER Synchronous Output Enables for Power Management Low Voltage Operation XTAL Oscillator Interface 16-Lead SOIC Package 5.0V Tolerant Enable Inputs The MPC905 device is targeted for PCI bus or processor bus environments with up to 12 clock loads. Each of the six outputs on the 16 1 MPC905 can drive two series terminated 50Ω transmission lines. This capability effectively makes the MPC905 a 1:12 fanout buffer. D SUFFIX The MPC905 offers two synchronous enable inputs to allow users PLASTIC SOIC PACKAGE flexibility in developing power management features for their designs. CASE 751B-05 Both enable signals are active HIGH inputs. A logic ‘0’ on the Enable1 will pull outputs 0 to 4 into the logic ‘0’ state. A logic ‘1’ on the Enable1 input will result in outputs 0 to 4 to be toggling. A logic ‘0’ on Enable2 will cause output BLK5 to a logic ‘0’ state, whereas a logic ‘1’ on Enable2 will cause output BLK5 to toggle. The oscillator remains on. The Enable2 input can be used to disable any high power device for system power savings during periods of inactivity. Both enable inputs are synchronized internal to the chip so that the output disabling will happen only when the outputs are already LOW. This feature guarantees no runt pulses will be generated during enabling and disabling. VDD (3) GND (3) Pinout: 16-Lead Plastic Package (Top View) BCLK0 BCLK1 XTAL_IN BCLK2 BCLK3 XTAL_OUT Enable1 BCLK4 SYNCHRONIZE BCLK5 Enable2 SYNCHRONIZE XTAL_OUT 1 16 XTAL_IN Enable2 2 15 Enable1 GND1 3 14 BCLK5 BCLK0 4 13 VDD3 VDD1 5 12 BCLK4 BCLK1 6 11 GND3 GND2 7 10 BCLK3 BCLK2 8 9 VDD2 01/01 For More Information On This Product, REV 2 1 Go by to:Integrated www.freescale.com Freescale Timing Solutions Organization has been acquired Device Technology, Inc IDT™ 1:6 PCI Clock Generator/Fanout Buffer Motorola, Inc. 2001 1 MPC905 MPC905 1:6 PCI Clock Generator/Fanout Buffer Freescale Semiconductor, Inc. NETCOM MPC905 PIN CONFIGURATIONS Pin I/O Type Function XTAL_IN, XTAL_OUT Input Analog Enable1, Enable2 Input LVCMOS Crystal Oscillator Terminals Output Enable BCLK0 – BCLK5 Output LVCMOS Clock Outputs VDD Supply Positive Power Supply GND Supply Negative Power Supply Freescale Semiconductor, Inc... FUNCTION TABLE ENABLE1 ENABLE2 Outputs 0 to 4 Output 5 OSC (On/Off) 0 0 1 1 0 1 0 1 Low Low Toggling Toggling Low Toggling Low Toggling ON ON ON ON ABSOLUTE MAXIMUM RATINGS* Min Max Unit VDD Symbol Supply Voltage Parameter –0.5 4.6 V VIN Input Voltage –0.5 VCC + 0.5 V Toper Operating Temperature Range 0 +70 °C Tstg Storage Temperature Range –65 +150 °C Tsol Soldering Temperature Range (10 Sec) +260 °C Tj Junction Temperature Range +125 °C ESD Static Discharge Voltage ILatch Latch Up Current 1500 V 50 mA * Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min TA Ambient Temperature Range VCC Positive Supply Voltage (Functional Range) tDCin Thigh (at XTAL_IN Input) Tlow (at XTAL_IN Input) Max Unit 0 70 °C 3.0 3.6 V 0.44T1 0.44T1 0.56T1 0.56T1 T = Period 1. When using External Source for reference, requirement to meet PCI clock duty cycle requirement on the output. DC CHARACTERISTICS (TA = 0–70°C; VDD = 3.3V ±0.3V) Symbol Characteristic Min Typ Unit 5.52 V 0.8 V VIH High Level Input Voltage VIL Low Level Input Voltage VOH High Level Output Voltage VOL Low Level Output Voltage 0.4 V IIH Input High Current 2.52 µA IIL Input Low Current 2.5 µA ICC Power Supply Current 45 95 µA mA mA CIN Input Capacitance W 2.0 Max 2.4 DC 33MHz 66MHz V 20 37 78 XTAL_IN Others 9.0 4.5 Condition IOH = –36mA1 IOL = 36mA1 pF W 1. The MPC905 can drive 50 transmission lines on the incident edge. Each output drives one 50 parallel terminated transmission line to VTT = VCC/2. Alternately, the device drives up to two 50 series terminated transmission lines per output. 2. XTAL_IN input will sink up to 10mA when driven to 5.5V. There are no reliability concerns associated with the condition. Note that the Enable1 input must be a logic HIGH. Do not take the Enable1 input to a logic LOW with >VCC volts on the XTAL_IN input. W IDT™ 1:6 PCI Clock Generator/Fanout Buffer For More Information On This Product, MOTOROLA 2 Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc Go to: www.freescale.com 2 MPC905 TIMING SOLUTIONS DL207 — Rev 0 MPC905 1:6 PCI Clock Generator/Fanout Buffer Freescale Semiconductor, Inc. NETCOM MPC905 AC CHARACTERISTICS (TA = 0–70°C; VDD = 3.3V ±0.3V) Freescale Semiconductor, Inc... Symbol Characteristic Min Using External Crystal Using External Clock Source Typ Max Unit – DC 50 100 MHz 0.40T1 0.40T1 0.45T2 0.45T2 0.60T1 0.60T1 0.55T2 0.55T2 Condition Fmax Maximum Operating Frequency tpw Output Pulse Width tper Output Period tos Output-to-Output Skew tr, tf Rise/Fall Times (Slew Rate) tEN Enable Time tDIS Disable Time Aosc XTAL_IN to XTAL_OUT Oscillator Gain 6 db Phase Loop Phase Shift Modulo 360° + 30 Degrees HIGH (Above 2.0V) LOW (Below 0.8V) HIGH (Above 2.0V) LOW (Below 0.8V) T = Periods T – 400ps T = Desired Period Rising Edges Falling Edges 400 500 ps 4 V/ns Enable1 Enable2 5 4 ms Cycles Enable1 Enable2 4 4 Cycles 1 Series Terminated Transmission Lines 1. Assuming input duty cycle specs from Recommended Operationg Conditions table are met. 2. Assuming external crystal or 50% duty cycle external reference is used. Pin 16 Pin 1 Pin 16 100Ω Y1 10pF C3 fFUND 11.1111MHz 16pF C1 Figure 1. Crystal Oscillator Interface (Fundamental) 10pF + Ǹ 1 2p LTRAP CTRAP CTRAP Y1 33.3333MHz C1 Pin 1 C3 LTRAP 16pF Figure 2. Crystal Oscillator Interface (3rd Overtone) Table 1. Crystal Specifications Parameter Value Crystal Cut Fundamental AT Cut Resonance Parallel Resonance* Frequency Tolerance ±75ppm at 25°C Frequency/Temperature Stability ±150pm 0 to 70°C Operating Range 0 to 70°C Shunt Capacitance 5–7pF Equivalent Series Resistance (ESR) 50 to 80Ω Correlation Drive Level 100µW Aging 5ppm/Yr (First 3 Years) IDT™ 1:6 PCI Clock Generator/Fanout Buffer For More Information On This Product, TIMING SOLUTIONS 3 Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc Go to: www.freescale.com DL207 — Rev 0 3 MPC905 MOTOROLA MPC905 1:6 PCI Clock Generator/Fanout Buffer Freescale Semiconductor, Inc. NETCOM MPC905 BCLK5 BCLK0–4 ENABLE2 ENABLE1 Freescale Semiconductor, Inc... Figure 3. Enable Timing Diagram APPLICATIONS INFORMATION Driving Transmission Lines MPC905 OUTPUT BUFFER The MPC905 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 approximately 10Ω the drivers can drive either parallel or series terminated transmission lines. For more information on transmission lines the reader is referred to application note AN1091 in the Timing Solutions data book (DL207/D). IN 10Ω MPC905 OUTPUT BUFFER 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 MPC905 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 MPC905 clock driver is effectively doubled due to its capability to drive multiple lines. IN RS = 40Ω ZO = 50Ω OutA RS = 40Ω ZO = 50Ω OutB0 W 10 RS = 40Ω ZO = 50Ω OutB1 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 MPC905 output buffers 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. The output waveform in Figure 5 IDT™ 1:6 PCI Clock Generator/Fanout Buffer For More Information On This Product, MOTOROLA 4 Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc Go to: www.freescale.com 4 MPC905 TIMING SOLUTIONS DL207 — Rev 0 MPC905 1:6 PCI Clock Generator/Fanout Buffer Freescale Semiconductor, Inc. NETCOM MPC905 shows a step in the waveform, this step is caused by the impedance mismatch seen looking into the driver. The parallel combination of the 40Ω 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) = 3.0 (25/55) = 1.36V At the load end the voltage will double, due to the near unity reflection coefficient, to 2.73V. It will then increment towards the quiescent 3.0V in steps separated by one round trip delay (in this case 4.0ns). 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. MPC905 OUTPUT BUFFER RS = 30Ω ZO = 50Ω RS = 30Ω ZO = 50Ω 3.0 VOLTAGE (V) Freescale Semiconductor, Inc... 2.5 10Ω OutA tD = 3.8956 OutB tD = 3.9386 2.0 In 10Ω + 30Ω k 30Ω = 50Ω k 50Ω 25Ω = 25Ω 1.5 Figure 6. Optimized Dual Line Termination 1.0 0.5 0 2 4 6 8 TIME (nS) 10 12 14 Figure 5. Single versus Dual Waveforms IDT™ 1:6 PCI Clock Generator/Fanout Buffer For More Information On This Product, TIMING SOLUTIONS 5 Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc Go to: www.freescale.com DL207 — Rev 0 5 MPC905 MOTOROLA MPC905 1:6 PCI Clock Generator/Fanout Buffer Freescale Semiconductor, Inc. NETCOM MPC905 OUTLINE DIMENSIONS D SUFFIX PLASTIC SOIC PACKAGE CASE 751B-05 ISSUE J –A– 16 9 1 8 –B– P NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 8 PL 0.25 (0.010) M B S Freescale Semiconductor, Inc... G R K F X 45 _ C –T– SEATING PLANE J M D 16 PL 0.25 (0.010) M T B S A S IDT™ 1:6 PCI Clock Generator/Fanout Buffer For More Information On This Product, MOTOROLA 6 Freescale Timing Solutions Organization has been acquired by Integrated Device Technology, Inc Go to: www.freescale.com 6 DIM A B C D F G J K M P R MILLIMETERS MIN MAX 9.80 10.00 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0_ 7_ 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.386 0.393 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0_ 7_ 0.229 0.244 0.010 0.019 MPC905 TIMING SOLUTIONS DL207 — Rev 0 MPC905 MPC92459 PART NUMBERS 900 1:6 PCI MHzClock Low Voltage Generator/Fanout LVDS Clock Buffer Synthesizer INSERT PRODUCT NAME AND DOCUMENT TITLE NETCOM NETCOM Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 [email protected] 480-763-2056 Corporate Headquarters Asia Pacific and Japan Europe Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United States 800 345 7015 +408 284 8200 (outside U.S.) Integrated Device Technology Singapore (1997) Pte. Ltd. Reg. No. 199707558G 435 Orchard Road #20-03 Wisma Atria Singapore 238877 +65 6 887 5505 IDT Europe, Limited Prime House Barnett Wood Lane Leatherhead, Surrey United Kingdom KT22 7DE +44 1372 363 339 © 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA XX-XXXX-XXXXX