ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER GENERAL DESCRIPTION FEATURES The ICS83947I-147 is a low skew, 1-to-9 LVCMOS/LVTTL Fanout Buffer and a member of HiPerClockS™ the HiPerClockS™ family of High Performance Clock Solutions from ICS. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 9 to 18 by utilizing the ability of the outputs to drive two series terminated lines. • 9 LVCMOS/LVTTL outputs Guaranteed output and part-to-part skew characteristics make the ICS83947I-147 ideal for high performance, 3.3V or 2.5V single ended applications. • Additive phase jitter, RMS: 0.02ps (typical) @ 3.3V ICS • Selectable CLK0 and CLK1 can accept the following input levels: LVCMOS and LVTTL • Maximum output frequency: 250MHz • Output skew: 115ps (maximum) • Part-to-part skew: 500ps (maximum) • Full 3.3V or 2.5V operating supply • -40°C to 85°C ambient operating temperature • Pin compatible with the MPC947 BLOCK DIAGRAM PIN ASSIGNMENT GND 32 31 30 29 28 27 26 25 Q0 Q1 CLK_SEL Q2 1 VDDO CLK1 Q1 0 GND CLK0 Q0 Q LE VDDO GND D CLK_EN Q2 Q3 Q4 Q5 GND 1 24 GND CLK_SEL 2 23 Q3 CLK0 3 22 VDDO CLK1 4 21 Q4 CLK_EN 5 20 GND OE 6 19 Q5 VDD 7 18 VDDO GND 8 17 GND ICS83947I-147 9 10 11 12 13 14 15 16 GND Q6 VDDO Q7 GND Q8 Q7 VDDO GND Q6 Q8 32-Lead LQFP 7mm x 7mm x 1.4mm package body Y Package Top View OE 83947AYI-147 http://www.icst.com/products/hiperclocks.html 1 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER TABLE 1. PIN DESCRIPTIONS Number Name Type Description 1, 8, 9, 12, 16, 17, 20, 24, 25, 29, 32 GND Power 2 CLK_SEL Input 3, 4 CLK0, CLK1 Input 5 CLK_EN Input Pullup Clock enable. LVCMOS / LVTTL interface levels. 6 OE Input Pullup Output enable. LVCMOS / LVTTL interface levels. 7 VDD Power Power supply ground. Clock select input. When HIGH, selects CLK1. When LOW, selects CLK0. LVCMOS / LVTTL interface levels. Pullup Reference clock inputs. LVCMOS / LVTTL interface levels. Pullup Core supply pin. 10, 14, 18, 22, 27, 31 VDDO Power Output supply pins. Q0 thru Q8 clock outputs. 11, 13, 15, 19, 21, Q8, Q7, Q6, Q5, Output 23, 26, 28, 30 Q4, Q3, Q2, Q1, Q0 LVCMOS / LVTTL interface levels. NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter CIN 4 pF 12 pF RPULLUP Input Capacitance Power Dissipation Capacitance (per output) Input Pullup Resistor 51 KΩ ROUT Output Impedance 7 Ω CPD Test Conditions TABLE 3. OUTPUT ENABLE Control Inputs AND Typical Maximum Units CLOCK ENABLE FUNCTION TABLE Output OE CLK_EN 0 X Hi-Z 1 0 LOW 1 1 Follows CLK input 83947AYI-147 Minimum Q0:Q8 http://www.icst.com/products/hiperclocks.html 2 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD 4.6V Inputs, VI -0.5V to VDD + 0.5 V Outputs, VO -0.5V to VDDO + 0.5V Package Thermal Impedance, θJA 47.9°C/W (0 lfpm) Storage Temperature, TSTG -65°C to 150°C NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 3.3V±0.3V OR 2.5V±5%, TA = -40°C TO 85°C Symbol Parameter VDD Test Conditions Core Supply Voltage Minimum Typical Maximum Units 3.0 3.3 3.6 V 2.375 2.5 2.625 V 3.0 3.3 3.6 V 2.375 2.5 VDDO Output Supply Voltage 2.625 V IDD Input Supply Current 50 mA IDDO Output Supply Current 9 mA TABLE 4B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDO = 3.3V±0.3V, TA = -40°C TO 85°C Symbol Parameter Test Conditions VIH Input High Voltage VIL Input Low Voltage Minimum Typical 2 CLK0, CLK1, OE, CLK_SEL, CLK_EN IIN Input Current VOH Output High Voltage; NOTE 1 IOH = -20mA Maximum Units 3.6 V 0.8 V -100 µA 2.5 V VOL Output Low Voltage; NOTE 1 IOL = 20mA 0.4 V NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement Information Section, 3.3V Output Load Test Circuit Diagram. TABLE 4B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDO = 2.5V±5%, TA = -40°C TO 85°C Symbol Parameter VIH Test Conditions Minimum Input High Voltage Typical Maximum Units 2 VDD + 0.3 V CLK0, CLK1 -0.3 1.3 V CLK_SEL, CLK_EN, OE -0.3 0.8 V 5 µA VIL Input Low Voltage IIH Input High Current CLK0, CLK1, OE, CLK_SEL, CLK_EN IIL Input Low Current CLK0, CLK1, OE, CLK_SEL, CLK_EN VOH Output High Voltage; NOTE 1 VDD = VIN = 2.625V VDD = 32.625V, VIN = 0V -150 µA 1.8 V VOL Output Low Voltage; NOTE 1 0.5 V NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement Information Section, 2.5V Output Load Test Circuit Diagram. 83947AYI-147 http://www.icst.com/products/hiperclocks.html 3 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER TABLE 5A. AC CHARACTERISTICS, VDD = VDDO = 3.3V±0.3V, TA = -40°C TO 85°C Symbol Parameter fMAX Output Frequency tPD Propagation Delay, NOTE 1 tsk(o) Output Skew; NOTE 2, 5 tsk(pp) Par t-to-Par t Skew; NOTE 3, 5 t R / tF Buffer Additive Phase Jitter, RMS; refer to Additive Phase Jitter Section Output Rise/Fall Time tjit(Ø) Test Conditions Minimum f ≤ 250MHZ Measured on rising edge @VDDO/2 Measured on rising edge @VDDO/2 2 (12KHz to 20MHz) Typical Maximum 250 Units MHz 4.2 ns 115 ps 500 ps ps 0.2 0.8V to 2.0V 0.2 1 ns tPW Output Pulse Width f > 133MHz tPeriod/2 - 1 tPeriod/2 + 1 ns odc Output Duty Cycle f ≤ 133MHz 40 60 % tEN Output Enable Time; NOTE 4 10 ns tDIS Output Disable Time; NOTE 4 10 tS Clock Enable Setup Time 0 ns ns Clock Enable Hold Time 1 ns tS All parameters measured at frequencies less than or equal to 250MHz unless noted otherwise. NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output. NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 3: Defined as skew between outputs on different devices operating at the same supply voltages and with equal load conditions. Using the same type of inputs on each device, the outputs are measured at VDDO/2. NOTE 4: These parameters are guaranteed by characterization. Not tested in production. NOTE 5: This parameter is defined in accordance with JEDEC Standard 65. TABLE 5B. AC CHARACTERISTICS, VDD = VDDO = 2.5V ± 5%, TA = -40°C TO 85°C Symbol Parameter fMAX Output Frequency tPD Propagation Delay, NOTE 1 tsk(o) Output Skew; NOTE 2, 5 tsk(pp) Par t-to-Par t Skew; NOTE 3, 5 tR / tF Buffer Additive Phase Jitter, RMS; refer to Additive Phase Jitter Section Output Rise/Fall Time tjit(Ø) Test Conditions Minimum f ≤ 250MHZ Measured on rising edge @VDDO/2 Measured on rising edge @VDDO/2 2.4 (12KHz to 20MHz) 20% - 80% Typical Maximum 250 Units MHz 4.5 ns 130 ps 600 ps 0.1 ps 300 800 ps tPeriod/2 - 1.2 tPW Output Pulse Width tPeriod/2 + 1.2 ns t EN Output Enable Time; NOTE 4 10 ns tDIS Output Disable Time; NOTE 4 10 ns tS Clock Enable Setup Time 0 ns Clock Enable Hold Time 1 ns tS All parameters measured at frequencies less than or equal to 250MHz unless noted otherwise. NOTE 1: Measured from VDD/2 of the input to VDDO/2 of the output. NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 3: Defined as skew between outputs on different devices operating at the same supply voltages and with equal load conditions. Using the same type of inputs on each device, the outputs are measured at VDDO/2. NOTE 4: These parameters are guaranteed by characterization. Not tested in production. NOTE 5: This parameter is defined in accordance with JEDEC Standard 65. 83947AYI-147 http://www.icst.com/products/hiperclocks.html 4 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER ADDITIVE PHASE JITTER the 1Hz band to the power in the fundamental. When the required offset is specified, the phase noise is called a dBc value, which simply means dBm at a specified offset from the fundamental. By investigating jitter in the frequency domain, we get a better understanding of its effects on the desired application over the entire time record of the signal. It is mathematically possible to calculate an expected bit error rate given a phase noise plot. SSB PHASE NOISE dBc/HZ The spectral purity in a band at a specific offset from the fundamental compared to the power of the fundamental is called the dBc Phase Noise. This value is normally expressed using a Phase noise plot and is most often the specified plot in many applications. Phase noise is defined as the ratio of the noise power present in a 1Hz band at a specified offset from the fundamental frequency to the power value of the fundamental. This ratio is expressed in decibels (dBm) or a ratio of the power in 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 1k Additive Phase Jitter, RMS @ 156.25MHz (12KHz to 20MHz) = 0.02ps typical @ 3.3V 10k 100k 1M 10M 100M SSB PHASE NOISE dBc/HZ OFFSET FROM CARRIER FREQUENCY (HZ) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 1k Additive Phase Jitter, RMS @ 156.25MHz (12KHz to 20MHz) = 0.01ps typical @ 2.5V 10k 100k 1M 10M 100M OFFSET FROM CARRIER FREQUENCY (HZ) As with most timing specifications, phase noise measurements have issues. The primary issue relates to the limitations of the equipment. Often the noise floor of the equipment is higher than the noise floor of the device. This is illustrated above. The de83947AYI-147 vice meets the noise floor of what is shown, but can actually be lower. The phase noise is dependant on the input source and measurement equipment. http://www.icst.com/products/hiperclocks.html 5 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER PARAMETER MEASUREMENT INFORMATION 1.65V ± 0.15V 1.25V±5% SCOPE VDD, SCOPE VDD, VDDO VDDO Qx LVCMOS Qx LVCMOS GND GND -1.65V ± 0.15V -1.25V±5% 3.3V OUTPUT LOAD AC TEST CIRCUIT PART 1 2.5V OUTPUT LOAD AC TEST CIRCUIT V V DDO DDO Qx Qx 2 PART 2 2 V V DDO DDO Qy Qy 2 t sk(pp) PART-TO-PART SKEW OUTPUT SKEW VDD 2 CLK0,CLK1 2 t sk(o) Q0:Q8 VDDO VDDO VDDO 2 2 2 t PW t PERIOD VDDO 2 Q0:Q8 t odc = PD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD PROPAGATION DELAY 2V Clock Outputs 2V 0.8V 0.8V tR Clock Outputs tF 3.3V OUTPUT RISE/FALL TIME 83947AYI-147 t PW t PERIOD 80% 80% tR tF 20% 20% 2.5V OUTPUT RISE/FALL TIME http://www.icst.com/products/hiperclocks.html 6 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER APPLICATION SCHEMATIC EXAMPLE Figure 1 shows an example of ICS83947I-147 application schematic. In this example, the device is operated at VCC=3.3V. The decoupling capacitors should be located as close as possible to the power pin. The input is driven by a 3.3V LVCMOS driver. For the LVCMOS output drivers, only one termination example is shown in this schematic. Additional termination approaches are shown in the LVCMOS Termination Application Note (refer to ICS website). VDDO R1 43 Zo = 50 R2 43 Zo = 50 VCC 43 Zo = 50 Ohm LVCMOS R3 43 Zo = 50 Ohm GND CLK_SEL CLK0 CLK1 CLK_EN OE VDD GND VDD LVCMOS GND Q3 VDDO Q4 GND Q5 VDDO GND 24 23 22 21 20 19 18 17 GND VDDO Q8 GND Q7 VDDO Q6 GND 1 2 3 4 5 6 7 8 VCC U1 ICS83947I-147 GND VDDO Q0 GND Q1 VDDO Q2 GND 32 31 30 29 28 27 26 25 R3 9 10 11 12 13 14 15 16 C5 0.1u VDD=3.3V VDDO=3.3V VDDO (U1-10) C1 0.1u (U1-14) (U1-18) C2 0.1u C3 0.1u (U1-31) (U1-27) (U1-22) C4 0.1u C2 0.1u C3 0.1u FIGURE 1. ICS83947I-147 SCHEMATIC LAYOUT 83947AYI-147 http://www.icst.com/products/hiperclocks.html 7 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER RELIABILITY INFORMATION TABLE 6. θJAVS. AIR FLOW TABLE FOR 32 LEAD LQFP θJA by Velocity (Linear Feet per Minute) 0 Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 67.8°C/W 47.9°C/W 200 500 55.9°C/W 42.1°C/W 50.1°C/W 39.4°C/W NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs. TRANSISTOR COUNT The transistor count for ICS83947I-147 is: 1040 83947AYI-147 http://www.icst.com/products/hiperclocks.html 8 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. PACKAGE OUTLINE - Y SUFFIX LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER FOR 32 LEAD LQFP TABLE 7. PACKAGE DIMENSIONS JEDEC VARIATION ALL DIMENSIONS IN MILLIMETERS BBA SYMBOL MINIMUM NOMINAL MAXIMUM 32 N A -- -- 1.60 A1 0.05 -- 0.15 A2 1.35 1.40 1.45 b 0.30 0.37 0.45 c 0.09 -- 0.20 D 9.00 BASIC D1 7.00 BASIC D2 5.60 Ref. E 9.00 BASIC E1 7.00 BASIC E2 5.60 Ref. 0.80 BASIC e L 0.45 0.60 0.75 θ 0° -- 7° ccc -- -- 0.10 Reference Document: JEDEC Publication 95, MS-026 83947AYI-147 http://www.icst.com/products/hiperclocks.html 9 REV. A SEPTEMBER 24, 2004 ICS83947I-147 Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-9 LVCMOS/LVTTL FANOUT BUFFER TABLE 8. ORDERING INFORMATION Part/Order Number Marking Package Count Temperature ICS83947AYI-147 ICS83947AI147 32 Lead LQFP 250 per tray -40°C to 85°C ICS83947AYI-147T ICS83947AI147 32 Lead LQFP on Tape and Reel 1000 -40°C to 85°C The aforementioned trademark, HiPerClockS™ is a trademark of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial and industrial applications. Any other applications such as those requiring high reliability or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments. 83947AYI-147 http://www.icst.com/products/hiperclocks.html 10 REV. A SEPTEMBER 24, 2004