PRELIMINARY ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIALTO-LVCMOS/LVTTL FANOUT BUFFER GENERAL DESCRIPTION FEATURES The ICS8344I-01 is a low voltage, low skew ICS fanout buffer and a member of the HiPerClockS ™ HiPerClockS™ family of High Performance Clock Solutions from IDT. The ICS8344I-01 has two selectable clock inputs. The CLKx, nCLKx pairs can accept most standard differential input levels. The ICS8344I-01 is designed to translate any differential signal level to LVCMOS/LVTTL levels. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased to 48 by utilizing the ability of the outputs to drive two series terminated lines. Redundant clock applications can make use of the dual clock inputs which also facilitate board level testing. The clock enable is internally synchronized to eliminate runt pulses on the outputs during asynchronous assertion/deassertion of the clock enable pin. The outputs are driven low when disabled. The ICS8344I-01 is characterized at full 3.3V, full 2.5V and mixed 3.3V input and 2.5V output operating supply modes. • Twenty-four LVCMOS/LVTTL outputs, 7Ω typical output impedance • Two selectable differential CLKx, nCLKx inputs • CLK0, nCLK0 and CLK1, nCLK1 pairs can accept the following input levels: LVDS, LVPECL, LVHSTL, SSTL, HCSL • Maximum output frequency: 200MHz • Translates any single ended input signal to LVCMOS/LVTTL with resistor bias on nCLK input • Synchronous clock enable • Output skew: 250ps (maximum) • Part-to-part skew: 1ns (maximum) • Bank skew: 125ps (maximum) • Propagation delay: 5.25ns (maximum) • Output supply modes: Core/Output 3.3V/3.3V 2.5V/2.5V 3.3V/2.5V Guaranteed output and part-to-part skew characteristics make the ICS8344I-01 ideal for those clock distribution applications demanding well defined performance and repeatability. • -40°C to 85°C ambient operating temperature • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages BLOCK DIAGRAM PIN ASSIGNMENT Q8 Q9 VDDO GND Q10 Q11 Q12 Q13 VDDO GND Q14 Q15 CLK_SEL CLK0 nCLK0 0 CLK1 nCLK1 1 Q16 Q17 VDDO GND Q18 Q19 Q20 Q21 VDDO GND Q22 Q23 Q0:Q7 Q8:Q15 Q16:Q23 LE Q ICS8344-01 36 35 34 33 32 31 30 29 28 27 26 25 Q7 Q6 VDDO GND Q5 Q4 Q3 Q2 VDDO GND Q1 Q0 nc OE CLK_EN CLK0 nCLK0 VDD GND CLK1 nCLK1 VDD GND CLK_SEL CLK_EN 48 47 46 45 44 43 42 41 40 39 38 37 1 2 3 4 5 48-Lead LQFP 6 7mm x 7mm x 1.4mm 7 package body 8 Y Package 9 Top View 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 nD OE The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice. IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 1 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY TABLE 1. PIN DESCRIPTIONS Number Name 1, 2, 5, 6 7, 8, 11, 12 Q16, Q17, Q18, Q19 Q20, Q21, Q22, Q23 Output Q16 thru Q23 outputs. 7Ω typical output impedance. VDDO Power Output supply pins. GND Power Power supply ground. 13 CLK_SEL Input 15, 19 VDD Power 3, 9, 28, 34, 39, 45 4, 10, 14,18, 27, 33, 40, 46 Type 16 nCLK1 Input 17 CLK1 Input 20 nCLK0 Input 21 CLK0 Input 22 CLK_EN Input 23 OE Input Description Clock select input. When HIGH, selects CLK1, nCLK inputs, Pulldown When LOW, selects CLK0, nCLK0 inputs. LVCMOS / LVTTL interface levelss. Core supply pins. Pullup Inver ting differential LVPECL clock input. Pulldown Non-inver ting differential LVPECL clock input. Pullup Inver ting differential LVPECL clock input. Pulldown Non-inver ting differential LVPECL clock input. Synchronizing control for enabling and disabling clock Pullup outputs. LVCMOS interface levels. Output enable. Controls enabling and disabling of outputs Pullup Q0 thru Q23. LVCMOS / LVTTL interface levels. No connect. 24 nc Unused 25, 26, 29, 30 Q0, Q1, Q2, Q3 Output Q0 thru Q7 outputs. 7Ω typical output impedance. 31, 32, 35, 36 Q4, Q5, Q6, Q7 37, 38, 41, 42 Q8, Q9, Q10, Q11 Output Q8 thru Q15 outputs. 7Ω typical output impedance. 43, 44, 47, 48 Q12, Q13, Q14, Q15 NOTE: Pullup and Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter CIN RPULLUP Input Capacitance Power Dissipation Capacitance (per output) Input Pullup Resistor 51 KW RPULLDOWN Input Pulldown Resistor 51 KΩ ROUT Output Impedance CPD IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER Test Conditions Minimum Typical Maximum 4 Units pF pF 5 2 7 12 Ω ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY TABLE 3A. OUTPUT ENABLE FUNCTION TABLE Banks 1, 2, 3 Inputs Outputs OE CLK_EN Q0-Q23 0 X Hi-Z 1 0 Disabled in logic LOW state. NOTE 1 1 1 Enabled. NOTE 1 NOTE 1: The clock enable and disable function is synchronous to the falling edge of the selected reference clock. TABLE 3B. CLOCK SELECT FUNCTION TABLE Control Input Clock CLK_SEL CLK0, nCLK0 CLK1, nCLK1 0 Selected De-selected 1 De-selected Selected TABLE 3C. CLOCK INPUT FUNCTION TABLE Inputs Outputs OE CLK0, CLK1 nCLK0, nCLK1 Q0 thru Q23 1 0 1 LOW Input to Output Mode Polarity Differential to Single Ended Non Inver ting 1 1 0 HIGH Differential to Single Ended Non Inver ting 1 0 Biased; NOTE 1 LOW Single Ended to Differential Non Inver ting 1 1 Biased; NOTE 1 HIGH Single Ended to Differential Non Inver ting 1 Biased; NOTE 1 0 HIGH Single Ended to Differential Inver ting 1 Biased; NOTE 1 1 LOW Single Ended to Differential Inver ting NOTE 1: Please refer to the Application Information section on page 8, Figure 1, which discusses Wiring the Differential Input to Accept Single-Ended Levels. IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 3 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY 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 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. Package Thermal Impedance, θJA 47.9°C/W (0 lfpm) Storage Temperature, TSTG -65°C to 150°C TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 3.3V±5% OR 2.5V ± 5%, OR VDD = 3.3V ± 5%, VDDO = 2.5V ± 5%; TA = -40°C TO 85°C Symbol Parameter Test Conditions VDD Core Supply Voltage VDDO Output Supply Voltage IDD Power Supply Current IDDO Output Supply Current Minimum Typical Maximum Units 3.135 3.3 3.465 V 2.375 2.5 2.625 V 3.135 3.3 3.465 V 2.375 2.5 2.625 V 70 mA 25 mA TABLE 4B. LVCMOS DC CHARACTERISTICS, VDD = VDDO = 3.3V±5% OR 2.5V ± 5%, OR VDD = 3.3V ± 5%, VDDO = 2.5V ± 5%; TA = -40°C TO 85°C Symbol Parameter VIH Input High Voltage VIL Input Low Voltage IIH Input High Current IIL Input Low Current VOH VOL Test Conditions Minimum Typical Maximum Units 2 VDD + 0.3 V -0.3 0.8 V CLK_SEL, CLK_EN, OE CLK_SEL, CLK_EN, OE CLK_EN, OE VDD = VIN = 3.465V or 2.625V 5 µA CLK_SEL VDD = VIN = 3.465V or 2.625V 150 µA CLK_EN, OE VDD = 3.465 or 2.625V, VIN = 0V CLK_SEL Output High Voltage Output Low Voltage IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER -150 µA VDD = 3.465 or 2.625V, VIN = 0V -5 µA VDDO = 3.135V, IOH = -36mA 2.6 V VDDO = 2.375V, IOH = -27mA 1.8 V VDDO = 3.135V, IOL = 36mA 0.5 V VDDO = 2.375V, IOL = 27mA 0.5 V 4 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY TABLE 4C. DIFFERENTIAL DC CHARACTERISTICS, VDD = VDDO = 3.3V±5% OR 2.5V ± 5%, OR VDD = 3.3V ± 5%, VDDO = 2.5V ± 5%; TA = -40°C TO 85°C Symbol Parameter Maximum Units VDD = VIN = 3.465V or 2.625V Test Conditions Minimum Typical 5 µA CLK0, CLK1 VDD = VIN = 3.465V or 2.625V 150 µA IIH Input High Current nCLK0, nCLK1 Input Low Current nCLK0, nCLK1 VDD = 3.465V or 2.625V, VIN = 0V -150 µA IIL CLK0, CLK1 VDD = 3.465V or 2.625V, VIN = 0V -5 µA VPP Peak-to-Peak Input Voltage 0.15 1.3 V Common Mode Input Voltage: GND + 0.5 VDD - 0.85 NOTE 1, 2 NOTE 1: For single ended applications, the maximum input voltage for CLK0, nCLK0 and CLK1, nCLK1 is VDD + 0.3V. NOTE 2: Common mode voltage is defined as VIH. VCMR V TABLE 5. AC CHARACTERISTICS, VDD = VDDO = 3.3V±5% OR 2.5V ± 5%, OR VDD = 3.3V ± 5%, VDDO = 2.5V ± 5%; TA = -40°C TO 85°C Symbol Parameter Test Conditions fMAX Output Frequency tPD Propagation Delay, NOTE 1 t sk(b) Q0:Q7 Bank Skew; Q8:Q15 NOTE 2, 6 Q16:Q23 Measured on the rising edge of VDDO/2 t sk(o) Output Skew; NOTE 3, 6 t sk(pp) Par t-to-Par t Skew; NOTE 4, 6 tR Output Rise Time; NOTE 5 30% to 70% tF Output Fall Time; NOTE 5 o dc Minimum Typical Maximum Units 200 MHz 5.25 ns 125 ps 200 ps 175 ps Measured on the rising edge of VDDO/2 250 ps Measured on the rising edge of VDDO/2 1 ns 200 800 ps 30% to 70% 200 800 ps Output Duty Cycle f ≤ 200MHz 40% 60% % tEN Output Enable Time; NOTE 5 f = 10MHz 5 ns tDIS Output Disable TIme; NOTE 5 f = 10MHz 4 ns f ≤ 200MHz 2.5 All parameters measured at 200MHz and VPPtyp unless noted otherwise. NOTE 1: Measured from the differential input crossing point to VDDO/2. NOTE 2: Defined as skew within a bank of outputs at the same voltages and with equal load conditions. NOTE 3: Defined as skew across banks of outputs at the same supply voltages and with equal load conditions. NOTE 4: Defined as between outputs at the same supply voltages and with equal load conditions. Measured at VDDO/2. NOTE 5: These parameters are guaranteed by characterization. Not tested in production. NOTE 6: This parameter is defined in accordance with JEDEC Standard 65. IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 5 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY PARAMETER MEASUREMENT INFORMATION 1.65V±5% 2.05V±5% 1.25V±5% SCOPE VDD, VDDO SCOPE VDD Qx VDDO LVCMOS Qx GND GND LVCMOS -1.65V±5% -1.25V±5% 3.3V OUTPUT LOAD AC TEST CIRCUIT 3.3V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT 1.25V±5% VDD SCOPE VDD, VDDO nCLK0, nCLK1 V Qx Cross Points PP LVCMOS V CMR CLK0, CLK1 GND GND -1.25V±5% 2.5V OUTPUT LOAD AC TEST CIRCUIT PART 1 Qx PART 2 DIFFERENTIAL INPUT LEVEL V V DDO DDO Qx 2 V V DDO Qy DDO Qy 2 tsk(pp) PART-TO-PART SKEW IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 2 2 tsk(o) OUTPUT SKEW 6 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY nCLK0, nCLK1 V DDO CLK0, CLK1 2 Q0:Q23 t PW t PERIOD Q0:Q23 t PD odc = t PW x 100% t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD PROPAGATION DELAY Clock Outputs 80% 80% tR tF 20% 20% OUTPUT RISE/FALL TIME IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 7 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY APPLICATION INFORMATION WIRING THE DIFFERENTIAL INPUT TO ACCEPT SINGLE ENDED LEVELS Figure 1 shows how the differential input can be wired to accept single ended levels. The reference voltage V_REF = VDD/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 VDD = 3.3V, V_REF should be 1.25V and R2/R1 = 0.609. VDD R1 1K Single Ended Clock Input CLKx V_REF nCLKx C1 0.1u R2 1K FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS INPUTS: OUTPUTS: CLK/nCLK INPUT: For applications not requiring the use of the differential input, both CLK and nCLK can be left floating. Though not required, but for additional protection, a 1kΩ resistor can be tied from CLK to ground. LVCMOS OUTPUT: All unused LVCMOS output can be left floating. There should be no trace attached. LVCMOS CONTROL PINS: All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1kΩ resistor can be used. IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 8 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY 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 2A to 2E 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 2A, the input termination applies for IDT 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 2A. HIPERCLOCKS CLK/nCLK INPUT DRIVEN IDT HIPERCLOCKS LVHSTL DRIVER FIGURE 2B. 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 2C. HIPERCLOCKS CLK/nCLK INPUT DRIVEN 3.3V LVPECL DRIVER FIGURE 2D. 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 2E. HIPERCLOCKS CLK/NCLK INPUT DRIVEN 3.3V LVPECL DRIVER WITH AC COUPLE IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER BY 9 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY RELIABILITY INFORMATION TABLE 6. θJAVS. AIR FLOW TABLE FOR 48 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 ICS8344I-01 is: 1503 IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 10 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY PACKAGE OUTLINE - Y SUFFIX FOR 48 LEAD LQFP TABLE 7. PACKAGE DIMENSIONS JEDEC VARIATION ALL DIMENSIONS IN MILLIMETERS SYMBOL BBC MINIMUM NOMINAL MAXIMUM 48 N A -- -- 1.60 A1 0.05 -- 0.15 A2 1.35 1.40 1.45 b 0.17 0.22 0.27 c 0.09 -- 0.20 D 9.00 BASIC D1 7.00 BASIC D2 5.50 Ref. E 9.00 BASIC E1 7.00 BASIC E2 5.50 Ref. e 0.50 BASIC L 0.45 0.60 0.75 θ 0° -- 7° ccc -- -- 0.08 Reference Document: JEDEC Publication 95, MS-026 IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 11 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY TABLE 8. ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature ICS8344AYI-01 ICS8344AYI-01 48 Lead LQFP tray -40°C to 85°C ICS8344AYI-01T ICS8344AYI-01 48 Lead LQFP 1000 tape & reel -40°C to 85°C ICS8344AYI-01LF ICS8344AYI0lL 48 lead "Lead-Free" LQFP tray -40°C to 85°C ICS8344AYI-01LFT ICS8344AYI0lL 48 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. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology, Incorporated (IDT) 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 IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT ™ / ICS™ LVCMOS/LVTTL FANOUT BUFFER 12 ICS8344AYI-01 REV. B MAY 10, 2007 ICS8344I-01 LOW SKEW, 1-TO-24 DIFFERENTIAL-TO-LVCMOS/LVTTL FANOUT BUFFER PRELIMINARY 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 321 Kingston Road Leatherhead, Surrey KT22 7TU England +44 (0) 1372 363 339 Fax: +44 (0) 1372 378851 © 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT, the IDT logo, ICS and HiPerClockS are trademarks of Integrated Device Technology, Inc. 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