Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER GENERAL DESCRIPTION FEATURES The ICS85310I-31 is a low skew, high performance dual 1-to-5 Differential-to-2.5V/3.3V ECL/LVPECL HiPerClockS™ Fanout Buffer and a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The CLKx, nCLKx pairs can accept most standard differential input levels. The ICS85310I-31 is characterized to operate from either a 2.5V or a 3.3V power supply. Guaranteed output and part-to-part skew characteristics make the ICS85310I-31 ideal for those clock distribution applications demanding well defined performance and repeatability. • 2 differential 2.5V/3.3V LVPECL / ECL bank outputs ICS • 2 differential clock input pairs • CLKx, nCLKx pairs can accept the following differential input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL • Maximum output frequency: 700MHz • Translates any single ended input signal to 3.3V LVPECL levels with resistor bias on nCLKx input • Output skew: 25ps (typical) • Part-to-part skew: 270ps (typical) • Propagation delay: 1.7ns (typical) • Additive phase jitter, RMS: <0.13ps (typical) • LVPECL mode operating voltage supply range: VCC = 2.375V to 3.8V, VEE = 0V • ECL mode operating voltage supply range: VCC = 0V, VEE = -3.8V to -2.375V • -40°C to 85°C ambient operating temperature • Lead-Free package fully RoHS compliant BLOCK DIAGRAM PIN ASSIGNMENT QA0 nQA0 CLKA nCLKA VCC 1 24 QA3 CLK_ENA 2 23 nQA3 CLKA 3 22 QA4 nCLKA 4 21 nQA4 CLK_ENB 5 20 QB0 CLKB 6 19 nQB0 nCLKB 7 18 QB1 VEE 8 17 nQB1 QB1 nQB1 9 10 11 12 13 14 15 16 VCCO QB2 nQB2 QB3 nQB3 32-Lead LQFP 7mm x 7mm x 1.4mm package body Y Package Top View QB3 nQB3 QB4 nQB4 85310AYI-31 QB4 QB2 nQB2 nQB4 LE ICS85310I-31 VCCO Q VCCO QB0 nQB0 D nQA2 QA4 nQA4 CLK_ENB QA2 32 31 30 29 28 27 26 25 QA3 nQA3 CLKB nCLKB nQA1 LE QA2 nQA2 QA1 Q QA0 D nQA0 CLK_ENA VCCO QA1 nQA1 www.icst.com/products/hiperclocks.html 1 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER TABLE 1. PIN DESCRIPTIONS Number Name Type 1 VCC Power 2 CLK_ENA Unused 3 CLKA Input Description Core supply pin. Pullup Synchronizing clock enable. LVCMOS/LVTTL interface levels. Pulldown Non-inver ting differential clock input. 4 nCLKA Input Pullup Inver ting differential clock input. 5 CLK_ENB Unused Pullup Synchronizing clock enable. LVCMOS/LVTTL interface levels. 6 CLKB Input 7 nCLKB Input 8 VEE Power Negative supply pin. 9, 16, 25, 32 VCCO Power Output supply pins. Pulldown Non-inver ting differential clock input. Pullup Inver ting differential clock input. 10, 11 nQB4, QB4 Output Differential output pair. LVPECL interface levels. 12, 13 nQB3, QB3 Output Differential output pair. LVPECL interface levels. 14, 15 nQB2, QB2 Output Differential output pair. LVPECL interface levels. 17, 18 nQB1, QB1 Output Differential output pair. LVPECL interface levels. 19, 20 nQB0, QB0 Output Differential output pair. LVPECL interface levels. 21, 22 nQA4, QA4 Output Differential output pair. LVPECL interface levels. 23, 24 nQA3, QA3 Output Differential output pair. LVPECL interface levels. 26, 27 nQA2, QA2 Output Differential output pair. LVPECL interface levels. 28, 29 nQA1, QA1 Output Differential output pair. LVPECL interface levels. 30, 31 nQA0, QA0 Output Differential output pair. LVPECL interface levels. NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter CIN Input Capacitance 4 pF RPULLUP Input Pullup Resistor 51 kΩ RPULLDOWN Input Pulldown Resistor 51 kΩ 85310AYI-31 Test Conditions Minimum www.icst.com/products/hiperclocks.html 2 Typical Maximum Units REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER TABLE 3A. CONTROL INPUT FUNCTION TABLE Inputs Outputs CLK_ENA, CLK_ENB QA0:QA4, QB0:QB4 nQA0:nQA4, nQB0:nQB4 0 Disabled; LOW Disabled; HIGH 1 Enabled Enabled After CLK_EN switches, the clock outputs are disabled or enabled following a rising and falling input clock edge as shown in Figure 1. In the active mode, the state of the outputs are a function of the CLKA, nCLKA and CLKB, nCLKB inputs as described in Table 3B. Enabled Disabled CLKA, nCLKB CLKA, CLKB CLK_ENA, CLK_ENB nQA0:nQA4, nQB0:nQB4 QA0:QA4, QB0:QB4 FIGURE 1. CLK_EN TIMING DIAGRAM TABLE 3B. CLOCK INPUT FUNCTION TABLE Inputs Outputs nQA0:nQA4, nQB0:nQB4 HIGH Input to Output Mode Polarity Differential to Differential Non Inver ting Differential to Differential Non Inver ting CLKA or CLKB nCLKA or nCLKB 0 1 QA0:QA4, QB0:QB4 LOW 1 0 HIGH LOW 0 Biased; NOTE 1 LOW HIGH Single Ended to Differential Non Inver ting 1 Biased; NOTE 1 HIGH LOW Single Ended to Differential Non Inver ting Biased; NOTE 1 0 HIGH LOW Single Ended to Differential Inver ting Biased; NOTE 1 1 LOW HIGH Single Ended to Differential Inver ting NOTE 1: Please refer to the Application Information "Wiring The Differential Input To Accept Single Ended Levels". 85310AYI-31 www.icst.com/products/hiperclocks.html 3 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC 4.6V Inputs, VI -0.5V to VCC + 0.5V Outputs, IO Continuous Current Surge Current 50mA 100mA 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, VCC, VCCO = 2.375V to 3.8V, TA = -40°C to 85°C Symbol Parameter Test Conditions Minimum Typical Maximum Units VCC Core Supply Voltage 2.375 3.3 3.8 V VCCO Output Supply Voltage 2.375 3.3 3.8 V IEE Power Supply Current 120 mA Maximum Units 2 VCC + 0.3 V -0.3 0.8 V 5 µA TABLE 4B. LVCMOS / LVTTL DC CHARACTERISTICS, VCC, VCCO = 2.375V to 3.8V, TA = -40°C to 85°C Symbol Parameter Test Conditions VIH Input High Voltage CLK_ENA, CLK_ENB VIL Input Low Voltage CLK_ENA, CLK_ENB IIH Input High Current CLK_ENA, CLK_ENB VCC = VIN = 3.8V IIL Input Low Current CLK_ENA, CLK_ENB VCC = 3.8V, VIN = 0V Minimum Typical -150 µA TABLE 4C. DIFFERENTIAL DC CHARACTERISTICS, VCC, VCCO = 2.375V to 3.8V, TA = -40°C to 85°C Symbol Parameter Test Conditions IIH Input High Current IIL Input Low Current VPP Peak-to-Peak Input Voltage Minimum Typical Maximum Units CLKA, CLKB VCC = VIN = 3.8V 150 µA nCLKA, nCLKB VCC = VIN = 3.8V 5 µA CLKA, CLKB VCC = 3.8V, VIN = 0V -5 nCLKA, nCLKB VCC = 3.8V, VIN = 0V -150 0.15 µA µA 1.3 V VCMR Common Mode Input Voltage; NOTE 1, 2 VEE + 0.5 VCC - 0.85 V NOTE 1: Common mode voltage is defined as VIH. NOTE 2: For single ended applications, the maximum input voltage for CLKA, nCLKA and CLKB, nCLKB is VCC + 0.3V. 85310AYI-31 www.icst.com/products/hiperclocks.html 4 REV. D JULY 6, 2005 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER TABLE 4D. LVPECL DC CHARACTERISTICS, VCC, VCCO = 2.375V to 3.8V, TA = -40°C to 85°C Symbol Parameter Test Conditions Minimum Typical Maximum Units Output High Voltage; NOTE 1 VCCO - 1.4 VCCO - 1.0 V VOL Output Low Voltage; NOTE 1 VCCO - 2.0 VCCO - 1.7 V VSWING Peak-to-Peak Output Voltage Swing 0.6 1.0 V Maximum Units 700 MHz VOH NOTE 1: Outputs terminated with 50Ω to VCCO - 2V. TABLE 5. AC CHARACTERISTICS, VCC, VCCO = 2.375V to 3.8V, TA = -40°C to 85°C Symbol Parameter fMAX Output Frequency tPD Propagation Delay; NOTE 1 1.7 2. 2 ns tsk(o) Output Skew; NOTE 2, 4 25 50 ps tsk(pp) 270 550 ps tR Par t-to-Par t Skew; NOTE 3, 4 Buffer Additive Phase Jitter, RMS; refer to Additive Phase Jitter Section Output Rise Time 20% to 80% 200 700 ps tF Output Fall Time 20% to 80% 200 700 ps 53 % tjit Test Conditions Minimum ƒ≤ 500MHz Typical <0.13 o dc Output Duty Cycle 47 All parameters measured at 500MHz unless noted otherwise. NOTE 1: Measured from the differential input crossing point to the differential output crossing point. NOTE 2: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at the output differential cross points. 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 the differential cross points. NOTE 4: This parameter is defined in accordance with JEDEC Standard 65. 85310AYI-31 www.icst.com/products/hiperclocks.html 5 ps REV. D JULY 6, 2005 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL 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. 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 Additive Phase Jitter, RMS -20 @ 155.52MHz = <0.13ps typical -30 -40 -50 SSB PHASE NOISE dBc/HZ -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 100 1k 10k 100k 1M 10M 100M OFFSET FROM CARRIER FREQUENCY (HZ) 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. 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 de- 85310AYI-31 www.icst.com/products/hiperclocks.html 6 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER PARAMETER MEASUREMENT INFORMATION 2V VCC, VCCO Qx VCC SCOPE nCLKA, nCLKB LVPECL V Cross Points PP V CMR CLKA, CLKB nQx VEE V EE -1.8V to -0.375V 3.3V OUTPUT LOAD AC TEST CIRCUIT DIFFERENTIAL INPUT LEVEL nQx PART 1 Qx nQx nQy nQy Qx PART 2 Qy Qy tsk(pp) tsk(o) PART-TO-PART SKEW OUTPUT SKEW nCLKA, nCLKB 80% 80% CLKA, CLKB VSW I N G Clock Outputs 20% 20% nQAx, nQBx tF tR QAx, QBx OUTPUT RISE/FALL TIME tPD PROPAGATION DELAY nQA0:nQA4, nQB0:nQB4 QA0:QA4, QB0:QB4 t PW t odc = PERIOD t PW x 100% t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD 85310AYI-31 www.icst.com/products/hiperclocks.html 7 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER APPLICATION INFORMATION WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS Figure 2 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF = VCC/2 is generated by the bias resistors R1, R2 and C1. This bias circuit should be located as close as possible to the input pin. The ratio of R1 and R2 might need to be adjusted to position the V_REF in the center of the input voltage swing. For example, if the input clock swing is only 2.5V and VCC = 3.3V, V_REF should be 1.25V and R2/R1 = 0.609. VCC R1 1K Single Ended Clock Input CLKx V_REF nCLKx C1 0.1u R2 1K FIGURE 2. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT TERMINATION FOR 3.3V LVPECL OUTPUTS The clock layout topology shown below is a typical termination for LVPECL outputs. The two different layouts mentioned are recommended only as guidelines. 50Ω transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. Figures 3A and 3B show two different layouts which are recommended only as guidelines. Other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. FOUT and nFOUT are low impedance follower outputs that generate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 3.3V Zo = 50Ω 125Ω FOUT 125Ω FIN Zo = 50Ω Zo = 50Ω FOUT 50Ω RTT = 1 Z ((VOH + VOL) / (VCC – 2)) – 2 o Zo = 50Ω VCC - 2V RTT 84Ω FIGURE 3A. LVPECL OUTPUT TERMINATION 85310AYI-31 FIN 50Ω 84Ω FIGURE 3B. LVPECL OUTPUT TERMINATION www.icst.com/products/hiperclocks.html 8 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER TERMINATION FOR 2.5V LVPECL OUTPUTS Figure 4A and Figure 4B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 50Ω to VCC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 4B can be eliminated and the termination is shown in Figure 4C. 2.5V 2.5V 2.5V VCCO=2.5V VCCO=2.5V R1 250 R3 250 Zo = 50 Ohm Zo = 50 Ohm + + Zo = 50 Ohm Zo = 50 Ohm - - 2,5V LVPECL Driv er 2,5V LVPECL Driv er R2 62.5 R1 50 R4 62.5 R2 50 R3 18 FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE 2.5V VCCO=2.5V Zo = 50 Ohm + Zo = 50 Ohm 2,5V LVPECL Driv er R1 50 R2 50 FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE 85310AYI-31 www.icst.com/products/hiperclocks.html 9 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER DIFFERENTIAL CLOCK INPUT INTERFACE The CLK /nCLK accepts LVDS, LVPECL, LVHSTL, SSTL, HCSL and other differential signals. Both VSWING and VOH must meet the VPP and VCMR input requirements. Figures 5A to 5E show interface examples for the HiPerClockS CLK/nCLK input driven by the most common driver types. The input interfaces suggested here are examples only. Please consult with the vendor of the driver component to confirm the driver termination requirements. For example in Figure 4A, the input termination applies for ICS HiPerClockS LVHSTL drivers. If you are using an LVHSTL driver from another vendor, use their termination recommendation. 3.3V 3.3V 3.3V 1.8V Zo = 50 Ohm CLK Zo = 50 Ohm CLK Zo = 50 Ohm nCLK Zo = 50 Ohm LVPECL nCLK HiPerClockS Input LVHSTL ICS HiPerClockS LVHSTL Driver R1 50 R1 50 HiPerClockS Input R2 50 R2 50 R3 50 FIGURE 5A. HIPERCLOCKS CLK/nCLK INPUT DRIVEN ICS HIPERCLOCKS LVHSTL DRIVER FIGURE 5B. HIPERCLOCKS CLK/nCLK INPUT DRIVEN 3.3V LVPECL DRIVER BY 3.3V 3.3V 3.3V 3.3V 3.3V R3 125 BY R4 125 Zo = 50 Ohm LVDS_Driv er Zo = 50 Ohm CLK CLK R1 100 Zo = 50 Ohm nCLK LVPECL R1 84 HiPerClockS Input nCLK Receiv er Zo = 50 Ohm R2 84 FIGURE 5C. HIPERCLOCKS CLK/nCLK INPUT DRIVEN 3.3V LVPECL DRIVER FIGURE 5D. HIPERCLOCKS CLK/nCLK INPUT DRIVEN 3.3V LVDS DRIVER BY BY 3.3V 3.3V 3.3V LVPECL Zo = 50 Ohm C1 Zo = 50 Ohm C2 R3 125 R4 125 CLK nCLK R5 100 - 200 R6 100 - 200 R1 84 HiPerClockS Input R2 84 R5,R6 locate near the driver pin. FIGURE 5E. HIPERCLOCKS CLK/nCLK INPUT DRIVEN 3.3V LVPECL DRIVER WITH AC COUPLE 85310AYI-31 BY www.icst.com/products/hiperclocks.html 10 REV. D JULY 6, 2005 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER POWER CONSIDERATIONS This section provides information on power dissipation and junction temperature for the ICS85310I-31. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS85310I-31 is the sum of the core power plus the power dissipated in the load(s). The following is the power dissipation for VCC = 3.8V, which gives worst case results. NOTE: Please refer to Section 3 for details on calculating power dissipated in the load. • • Power (core)MAX = VCC_MAX * IEE_MAX = 3.8V * 120mA = 456mW Power (outputs)MAX = 30.94mW/Loaded Output pair If all outputs are loaded, the total power is 10 * 30.94mW = 309.4mW Total Power_MAX (3.8V, with all outputs switching) = 456mW + 309.4mW = 765.4mW 2. Junction Temperature. Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device. The maximum recommended junction temperature for HiPerClockSTM devices is 125°C. The equation for Tj is as follows: Tj = θJA * Pd_total + TA Tj = Junction Temperature θJA = Junction-to-Ambient Thermal Resistance Pd_total = Total Device Power Dissipation (example calculation is in section 1 above) TA = Ambient Temperature In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming a moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1°C/W per Table 6 below. Therefore, Tj for an ambient temperature of 85°C with all outputs switching is: 85°C + 0.765W * 42.1°C/W = 117.2°C. This is below the limit of 125°C. This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow, and the type of board (single layer or multi-layer). TABLE 6. THERMAL RESISTANCE θJA FOR 32-PIN LQFP, FORCED CONVECTION 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. 85310AYI-31 www.icst.com/products/hiperclocks.html 11 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER 3. Calculations and Equations. LVPECL output driver circuit and termination are shown in Figure 6. VCCO Q1 VOUT RL 50 VCCO - 2V Figure 6. LVPECL Driver Circuit and Termination To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage of V - 2V. CCO • For logic high, VOUT = V OH_MAX (V CC_MAX • -V OH_MAX =V OL_MAX -V Pd_H = [(V – (V CCO_MAX OH_MAX CCO_MAX – 0.935V ) = 0.935V For logic low, VOUT = V (V =V OL_MAX CCO_MAX – 1.67V ) = 1.67V CCO_MAX - 2V))/R ] * (V CCO_MAX L -V OH_MAX ) = [(2V - (V CCO _MAX -V ))/R ] * (V OH_MAX CCO _MAX L -V )= OH_MAX [(2V - 0.935V)/50Ω] * 0.935V = 19.92mW Pd_L = [(V OL_MAX – (V CCO_MAX - 2V))/R ] * (V L CCO_MAX -V OL_MAX ) = [(2V - (V CCO_MAX -V OL_MAX ))/R ] * (V L CCO_MAX -V OL_MAX )= [(2V - 1.67V)/50Ω] * 1.67V = 11.02mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30.94mW 85310AYI-31 www.icst.com/products/hiperclocks.html 12 REV. D JULY 6, 2005 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER RELIABILITY INFORMATION TABLE 7. θJAVS. AIR FLOW TABLE FOR 32 LEAD LQFP θJA by Velocity (Linear Feet per Minute) Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 0 200 500 67.8°C/W 47.9°C/W 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 ICS85310I-31 is: 1216 85310AYI-31 www.icst.com/products/hiperclocks.html 13 REV. D JULY 6, 2005 ICS85310I-31 Integrated Circuit Systems, Inc. PACKAGE OUTLINE - Y SUFFIX LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER FOR 32 LEAD LQFP TABLE 8. 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 0.60 0.75 L 0.45 θ 0° -- 7° ccc -- -- 0.10 Reference Document: JEDEC Publication 95, MS-026 85310AYI-31 www.icst.com/products/hiperclocks.html 14 REV. D JULY 6, 2005 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER TABLE 9. ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature ICS85310AYI-31 ICS85310AYI31 32 lead LQFP tray -40°C to 85°C ICS85310AYI-31T ICS85310AYI31 32 lead LQFP 1000 tape & reel -40°C to 85°C ICS85310AYI-31LF ICS5310AI31L 32 lead "Lead Free" LQFP tray -40°C to 85°C ICS85310AYI-31LFT ICS5310AI31L 32 lead "Lead Free" LQFP 1000 tape & reel -40°C to 85°C NOTE: Par ts that are ordered with an "LF" suffix to the par t number are the Pb-Free configuration and are RoHS compliant. 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. 85310AYI-31 www.icst.com/products/hiperclocks.html 15 REV. D JULY 6, 2005 Integrated Circuit Systems, Inc. ICS85310I-31 LOW SKEW, DUAL, 1-TO-5 2.5V/3.3V DIFFERENTIAL-TO-ECL/LVPECL FANOUT BUFFER REVISION HISTORY SHEET Rev Table A Page 9 A A B T9 T4A T2 T4D C D T5 T9 85310AYI-31 14 4 Description of Change Date Added Termination for LVPECL Outputs. Updated par t number from ICS85310-31 to ICS85310I-31 throughout the data sheet to reflect operating temperature. Corrected Marking from ICS85310AYI-31 to ICS85310AYI31. Power Supply table - increased max. value for IEE to 120mA from 30mA max. 5/30/02 7/24/02 7/25/02 Power Considerations have re-adjusted to the increased IEE value. Pin Characteristics Table - changed 4pF max. to 4pF typical. Updated Absolute Maximum Ratings. LVPECL DC Characteristics Table - changed VSWING from 0.85V max. to 1.0V max. Application section added, Termination for 2.5V LVPECL Outputs and Differential Clock Input Interface. 10 & 11 Power Considerations - recalculated Total Power Dissipation for 3.8V. 14 Ordering Information Table - corrected marking from ICS85310AYI31 to ICS85310AI-31. Features Section - added Additive Phase Jitter bullet and Lead-Free bullet. 1 AC Characteristics Table - added Additive Phase Jitter row. 5 Added Additive Phase Jitter Section. 6 Ordering Information Table - added Lead-Free Par t Number and Note. 14 10 2 4 5 8&9 www.icst.com/products/hiperclocks.html 16 10/23/02 7/31/03 7/6/05 REV. D JULY 6, 2005