ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER GENERAL DESCRIPTION FEATURES The ICS8308I is a low-skew, 1-to-8 Fanout Buffer and a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The ICS8308I has two selectable clock inputs. The CLK, nCLK pair can accept most differential input levels. The LVCMOS_CLK can accept LVCMOS or LVTTL input levels. The low impedance LVCMOS/LVTTL outputs are designed to drive 50Ω series or parallel terminated transmission lines. The effective fanout can be increased from 8 to 16 by utilizing the ability of the outputs to drive two series terminated transmission lines. • 8 LVCMOS/LVTTL outputs (7Ω typical output impedance) The ICS8308I is characterized for 3.3V core/3.3V output, 3.3V core/2.5V output or 2.5V core/2.5V output operation. Guaranteed output and part-part skew characteristics make the 8308I ideal for those clock distribution applications requiring well defined performance and repeatability. • Selectable LVCMOS_CLK or differential CLK, nCLK inputs • CLK, nCLK pair can accept the following differential input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL • Maximum Output Frequency: 350MHz • Output Skew: (3.3V± 5%): 100ps (maximum) • Part to Part Skew: (3.3V± 5%): 1ns (maximum) • Supply Voltage Modes: (Core/Output) 3.3V/3.3V 3.3V/2.5V 2.5V/2.5V • -40°C to 85°C ambient operating temperature • Available in both, Standard and RoHS/Lead-Free compliant packages BLOCK DIAGRAM CLK_EN Pullup PIN ASSIGNMENT D Q LVCMOS_CLK Pullup CLK Pullup nCLK Pulldown LE 1 Q0 0 Q1 CLK_SEL Pullup Q2 Q3 Q0 GND CLK_SEL LVCMOS_CLK CLK nCLK CLK_EN OE VDD GND Q1 VDDO 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VDDO Q2 GND Q3 VDDO Q4 GND Q5 VDDO Q6 GND Q7 Q4 Q5 Q6 Q7 ICS8308I 24-Lead, 300-MIL TSSOP 4.4mm x 7.8mm x 0.92mm body package G Package Top View OE Pullup 8308AGI www.icst.com/products/hiperclocks.html 1 REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER TABLE 1. PIN DESCRIPTIONS Number 1, 11, 13, 15, 17, 19, 21, 23 2, 10, 14, 18, 22 Name Q0, Q1, Q7, Q6, Q5, Q4,Q3, Q2 GND Type Description Output Clock outputs. LVCMOS / LVTTL interface levels. Power 3 CLK_SEL Input 4 LVCMOS_CLK Input Pullup Power supply ground. Clock select input. Selects LVCMOS clock input when HIGH. Selects CLK, nCLK inputs when LOW. LVCMOS / LVTTL interface levels. Clock input. LVCMOS / LVTTL interface levels. 5 CLK Input Pullup Non-inver ting differential clock input. Pullup Pulldown Inver ting differential clock input. 6 nCLK Input 7 CLK_EN Input Pullup Clock enable. LVCMOS / LVTTL interface levels. 8 OE Input Pullup Output enable. LVCMOS / LVTTL interface levels. 9 VDD Power Core supply pin. 12, 16, 20, 24 VDDO Power Output supply pins. NOTE: Pullup and Pulldown refer 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 RPULLDOWN Input Pulldown Resistor 51 kΩ ROUT Output Impedance CPD Test Conditions Minimum 5 Typical Maximum 7 12 Units Ω TABLE 3A. CLOCK SELECT FUNCTION TABLE Control Input Clock Input CLK_SEL 0 CLK, nCLK is selected 1 LVCMOS_CLK is selected TABLE 3B. CLOCK INPUT FUNCTION TABLE Inputs Outputs nCLK Q0:Q7 Input to Output Mode Polarity CLK_SEL LVCMOS_CLK CLK 0 — 0 1 LOW Differential to Single Ended Non Inver ting 0 — 1 0 HIGH Differential to Single Ended Non Inver ting 0 — 0 Biased; NOTE 1 LOW Single Ended to Single Ended Non Inver ting 0 — 1 Biased; NOTE 1 HIGH Single Ended to Single Ended Non Inver ting 0 — Biased; NOTE 1 0 HIGH Single Ended to Single Ended Inver ting 0 — Biased; NOTE 1 1 LOW Single Ended to Single Ended Inver ting 1 0 — — LOW Single Ended to Single Ended Non Inver ting 1 1 — — HIGH Single Ended to Single Ended Non Inver ting NOTE 1: Please refer to the Application Information section, "Wiring the Differential Input to Accept Single Ended Levels". 8308AGI www.icst.com/products/hiperclocks.html 2 REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS 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 70°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±5%, TA = -40° TO 85° Symbol Parameter Test Conditions Minimum Typical Maximum Units VDD Core Supply Voltage 3.135 3. 3 3.465 V VDDO Output Supply Voltage 3.135 3. 3 3.465 V IDD Power Supply Current 46 mA IDDO Output Supply Current 11 mA TABLE 4B. POWER SUPPLY DC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 2.5V±5%, TA = -40° TO 85° Symbol Parameter VDD Minimum Typical Maximum Units Core Supply Voltage Test Conditions 3.135 3. 3 3.465 V 2.375 2. 5 VDDO Output Supply Voltage 2.625 V IDD Power Supply Current 46 mA IDDO Output Supply Current 10 mA Maximum Units TABLE 4C. POWER SUPPLY DC CHARACTERISTICS, VDD, VDDO = 2.5V±5%, TA = -40° TO 85° Symbol Parameter Test Conditions Minimum Typical VDD Core Supply Voltage 2.375 2. 5 2.625 V VDDO Output Supply Voltage 2.375 2. 5 2.625 V IDD Power Supply Current 43 mA IDDO Output Supply Current 10 mA 8308AGI www.icst.com/products/hiperclocks.html 3 REV. B JULY 25, 2005 Integrated Circuit Systems, Inc. ICS8308I LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER TABLE 4D. DC CHARACTERISTICS, VDD = VDDO = 3.3V±5%, TA = -40° TO 85° Symbol Parameter VIH Input High Voltage VIL Input Low Voltage Test Conditions Minimum LVCMOS LVCMOS_CLK Maximum Units 2 Typical VDD + 0.3 V -0.3 1.3 V 0.8 0.8 300 µA CLK_EN, OE IIN Input Current VIN = VDD or VIN = GND VOH Output High Voltage; NOTE 1 IOH = -24mA VOL Output Low Voltage; NOTE 1 2.4 V IOL = 24mA 0.55 IOL = 12mA 0.30 V 1.3 V VDD - 0.85 V Maximum Units VDD + 0.3 V VPP Peak-to-Peak Input Voltage CLK, nCLK 0.15 Input Common Mode Voltage; VCMR CLK, nCLK GND + 0.5 NOTE 2, 3 NOTE 1: Outputs capable of driving 50Ω transmission lines terminated with 50Ω to VDDO/2. See Parameter Measurement section, "3.3V Output Load AC Test Circuit". NOTE 2: For single ended applications, the maximum input voltage for CLK, nCLK is VDD + 0.3V. NOTE 3: Common mode voltage is defined as VIH. V TABLE 4E. DC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 2.5V±5%, TA = -40° TO 85° Symbol Parameter Test Conditions VIH Input High Voltage VIL Input Low Voltage IIN Input Current VIN = VDD or VIN = GND VOH Output High Voltage; NOTE 1 IOH = -15mA VOL Output Low Voltage; NOTE 1 IOL = 15mA LVCMOS Minimum Typical 2 LVCMOS_CLK -0.3 CLK_EN, OE VPP www.icst.com/products/hiperclocks.html 4 V V 300 µA 1.8 Peak-to-Peak Input Voltage CLK, nCLK 0.15 Input Common Mode Voltage; VCMR CLK, nCLK GND + 0.5 NOTE 2, 3 NOTE 1: Outputs capable of driving 50Ω transmission lines terminated with 50Ω to VDDO/2. See Parameter Measurement section, "3.3V Output Load AC Test Circuit". NOTE 2: For single ended applications, the maximum input voltage for CLK, nCLK is VDD + 0.3V. NOTE 3: Common mode voltage is defined as VIH. 8308AGI 1.3 0.8 V 0.6 V 1.3 V VDD - 0.85 V REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER TABLE 4F. DC CHARACTERISTICS, VDD, VDDO = 2.5V±5%, TA = -40° TO 85° Symbol Parameter Test Conditions VIH Input High Voltage VIL Input Low Voltage IIN Input Current VIN = VDD or VIN = GND VOH Output High Voltage; NOTE 1 IOH = -15mA VOL Output Low Voltage; NOTE 1 IOL = 15mA LVCMOS Minimum Typical 2 LVCMOS_CLK -0.3 CLK_EN, OE Maximum Units VDD + 0.3 V 1.3 V 0.7 V 300 µA 1.8 V VPP Peak-to-Peak Input Voltage CLK, nCLK 0.15 Input Common Mode Voltage; CLK, nCLK GND + 0.5 VCMR NOTE 2, 3 NOTE 1: Outputs capable of driving 50Ω transmission lines terminated with 50Ω to VDDO/2. See Parameter Measurement section, "3.3V Output Load AC Test Circuit". NOTE 2: For single ended applications, the maximum input voltage for CLK, nCLK is VDD + 0.3V. NOTE 3: Common mode voltage is defined as VIH. 0.6 V 1.3 V VDD - 0.85 V Maximum 350 Units MHz TABLE 5A. AC CHARACTERISTICS, VDD = VDDO = 3.3V±5%, TA = -40° TO 85° Symbol Parameter fMAX Output Frequency tPD Propagation Delay; CLK, nCLK; NOTE 1 LVCMOS_CLK; NOTE 2 Test Conditions Minimum Typical ƒ≤ 350MHz 2 4 ns ƒ≤ 350MHz 2 4 ns tsk(o) Output Skew; NOTE 3, 7 Measured on rising edge @VDDO/2 100 ps tsk(pp) Par t-to-Par t Skew; NOTE 4, 7 Measured on rising edge @VDDO/2 1 ns tR / tF Output Rise/Fall Time ns 0.8V to 2V 0.2 1 ƒ≤ 150MHz, Ref = CLK, nCLK 45 55 % 5 ns Output Disable Time; NOTE 5 5 CLK_EN to 1 Clock Enable CLK, nCLK Setup Time; tS CLK_EN to NOTE 6 0 LVCMOS_CLK CLK, nCLK to 0 Clock Enable CLK_EN Hold Time; tH LVCMOS_CLK NOTE 6 1 to CLK_EN NOTE 1: Measured from the differential input crossing point to VDDO/2 of the output. NOTE 2: Measured from VDD/2 of the input to VDDO/2 of the output. NOTE 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 4: 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 5: These parameters are guaranteed by characterization. Not tested in production. NOTE 6: Setup and Hold times are relative to the rising edge of the input clock. NOTE 7: This parameter is defined in accordance with JEDEC Standard 65. ns odc Output Duty Cycle tPZL, tPZH Output Enable Time; NOTE 5 tPLZ, tPHZ 8308AGI www.icst.com/products/hiperclocks.html 5 ns ns ns ns REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER TABLE 5B. AC CHARACTERISTICS, VDD = 3.3V±5%, VDDO = 2.5V±5%, TA = -40° TO 85° Symbol Parameter fMAX Output Frequency tPD Propagation Delay; CLK, nCLK; NOTE 1 LVCMOS_CLK; NOTE 2 Test Conditions Minimum ƒ≤ 350MHz ƒ≤ 350MHz Typical Maximum 350 Units MHz 2 4 ns 2 4 ns tsk(o) Output Skew; NOTE 3, 7 Measured on rising edge @VDDO/2 100 ps tsk(pp) Par t-to-Par t Skew; NOTE 4, 7 Measured on rising edge @VDDO/2 1 ns tR / tF Output Rise/Fall Time odc Output Duty Cycle 0.6V to 1.8V 0.2 1.0 ns ƒ≤ 150MHz, Ref = CLK, nCLK 45 55 % tPZL, tPZH Output Enable Time; NOTE 5 5 ns Output Disable Time; NOTE 5 5 CLK_EN to 1 Clock Enable CLK, nCLK Setup Time; tS CLK_EN to NOTE 6 0 LVCMOS_CLK CLK, nCLK to 0 Clock Enable CLK_EN Hold Time; tH LVCMOS_CLK NOTE 6 1 to CLK_EN NOTE 1: Measured from the differential input crossing point to VDDO/2 of the output. NOTE 2: Measured from VDD/2 of the input to VDDO/2 of the output. NOTE 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 4: 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 5: These parameters are guaranteed by characterization. Not tested in production. NOTE 6: Setup and Hold times are relative to the rising edge of the input clock. NOTE 7: This parameter is defined in accordance with JEDEC Standard 65. ns tPLZ, tPHZ 8308AGI www.icst.com/products/hiperclocks.html 6 ns ns ns ns REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER TABLE 5C. AC CHARACTERISTICS, VDD = VDDO = 2.5V±5%, TA = -40° TO 85° Symbol Parameter fMAX Output Frequency tPD Propagation Delay; CLK, nCLK; NOTE 1 LVCMOS_CLK; NOTE 2 Test Conditions Minimum ƒ≤ 350MHz ƒ≤ 350MHz Typical Maximum 350 Units MHz 1.5 4.2 ns 1. 7 4.4 ns tsk(o) Output Skew; NOTE 3, 7 Measured on rising edge @VDDO/2 160 ps tsk(pp) Par t-to-Par t Skew; NOTE 4, 7 Measured on rising edge @VDDO/2 2 ns tR / tF Output Rise/Fall Time odc Output Duty Cycle 0.6V to 1.8V 0.2 1.0 ns ƒ≤ 150MHz, Ref = CLK, nCLK 40 60 % tPZL, tPZH Output Enable Time; NOTE 5 5 ns Output Disable Time; NOTE 5 5 CLK_EN to 1 Clock Enable CLK, nCLK Setup Time; tS CLK_EN to NOTE 6 0 LVCMOS_CLK CLK, nCLK to 0 Clock Enable CLK_EN Hold Time; tH LVCMOS_CLK NOTE 6 1 to CLK_EN NOTE 1: Measured from the differential input crossing point to VDDO/2 of the output. NOTE 2: Measured from VDD/2 of the input to VDDO/2 of the output. NOTE 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 4: 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 5: These parameters are guaranteed by characterization. Not tested in production. NOTE 6: Setup and Hold times are relative to the rising edge of the input clock. NOTE 7: This parameter is defined in accordance with JEDEC Standard 65. ns tPLZ, tPHZ 8308AGI www.icst.com/products/hiperclocks.html 7 ns ns ns ns REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER PARAMETER MEASUREMENT INFORMATION 1.65V±5% 2.05V±5% 1.25V±5% SCOPE VDD, VDDO VDDO Qx LVCMOS SCOPE V DD Qx LVCMOS GND GND VDDO 2 -1.65V±5% -1.25V±5% 3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT 3.3V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT 1.25V±5% V DD SCOPE VDD, VDDO nCLK V Qx LVCMOS Cross Points PP V CMR CLK GND GND -1.25V±5% 2.5V CORE/2.5V OUTPUT LOAD AC TEST CIRCUIT PART 1 Qx V DDO Qx 2 V DDO Qy OUTPUT SKEW 8308AGI DIFFERENTIAL INPUT LEVEL 2 tsk(o) PART 2 Qy V DDO 2 V DDO 2 tsk(pp) PART-TO-PART SKEW www.icst.com/products/hiperclocks.html 8 REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER 2V 2V LVCMOS_ CLK VDDO 2 VDD = VDDO = 3.3V Clock Outputs 0.8V 0.8V tR nCLK tF CLK 1.8V 1.8V VDD = VDDO = 2.5V or ➤ Clock Outputs VDD = 3.3V, VDDO = 2.5V 0.6V VDDO 2 Q0:Q7 tR tPD 0.6V ➤ tF OUTPUT RISE/FALL TIME PROPAGATION DELAY V DDO 2 Q0:Q7 t PW t odc = PERIOD t PW x 100% t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD 8308AGI www.icst.com/products/hiperclocks.html 9 REV. B JULY 25, 2005 Integrated Circuit Systems, Inc. ICS8308I LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER 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 CLK V_REF nCLK C1 0.1u R2 1K FIGURE 1. SINGLE ENDED SIGNAL DRIVING DIFFERENTIAL INPUT RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS INPUTS: OUTPUTS: CLK INPUT: For applications not requiring the use of the test clock, it can be left floating. Though not required, but for additional protection, a 1kΩ resistor can be tied from the CLK input to ground. LVCMOS OUTPUT: All unused LVCMOS output can be left floating. We recommend that there is no trace attached. 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. SELECT PINS: All select pins have internal pull-ups and pull-downs; additional resistance is not required but can be added for additional protection. A 1kΩ resistor can be used. 8308AGI www.icst.com/products/hiperclocks.html 10 REV. B JULY 25, 2005 ICS87004I Integrated Circuit Systems, Inc. 1:4, DIFFERENTIAL-TO-LVCMOS/LVTTL ZERO DELAY CLOCK GENERATOR 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 3A to 3D 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 3A, 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 3A. HIPERCLOCKS CLK/NCLK INPUT DRIVEN ICS HIPERCLOCKS LVHSTL DRIVER BY FIGURE 3B. HIPERCLOCKS CLK/NCLK INPUT DRIVEN 3.3V LVPECL DRIVER 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 Receiv er R2 84 FIGURE 3C. HIPERCLOCKS CLK/NCLK INPUT DRIVEN 3.3V LVPECL DRIVER 87004AGI nCLK Zo = 50 Ohm BY FIGURE 3D. HIPERCLOCKS CLK/NCLK INPUT DRIVEN 3.3V LVDS DRIVER www.icst.com/products/hiperclocks.html 11 BY REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER SCHEMATIC EXAMPLE capacitors should be physically located near the power pin. Figure 3 shows a schematic example of the ICS8308I. In this example, the LVCMOS_CLK input is selected. The decoupling VDD Zo = 50 Ohm R1 R9 1K R10 1K R12 1K 43 VDD VDD U1 3.3V LVCMOS/LVTTL VDD Ro ~ 7 Ohm R11 1 2 3 4 5 6 7 8 9 10 11 12 Zo = 50 Ohm 43 3.3V_LVCMOS VDD=3.3V (U1,9) VDD C1 0.1u (U1,12) C2 0.1u (U1,16) (U1,20) C3 0.1u Q0 GND CLK_SEL LVCMOS_CLK CLK nCLK CLK_EN OE VDD GND Q1 VDDO VDDO Q2 GND Q3 VDDO Q4 GND Q5 VDDO Q6 GND Q7 24 23 22 21 20 19 18 17 16 15 14 13 (U1,24) C4 0.1u Zo = 50 Ohm R8 C5 0.1u 43 ICS8308I 3.3V LVCMOS/LVTTL FIGURE 3. ICS8308I LVPECL BUFFER SCHEMATIC EXAMPLE RELIABILITY INFORMATION TABLE 6. θJAVS. AIR FLOW TABLE FOR 24 LEAD TSSOP θJA by Velocity (Linear Feet per Minute) Multi-Layer PCB, JEDEC Standard Test Boards 0 200 500 70°C/W 63°C/W 60°C/W TRANSISTOR COUNT The transistor count for ICS8308I is: 1040 8308AGI www.icst.com/products/hiperclocks.html 12 REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. PACKAGE OUTLINE - G SUFFIX FOR LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER 24 LEAD TSSOP TABLE 7. PACKAGE DIMENSIONS SYMBOL Millimeters Minimum N A Maximum 24 -- 1.20 A1 0.05 0.15 A2 0.80 1.05 b 0.19 0.30 c 0.09 0.20 D 7.70 7.90 E E1 6.40 BASIC 4.30 e 4.50 0.65 BASIC L 0.45 0.75 α 0° 8° aaa -- 0.10 REFERENCE DOCUMENT: JEDEC PUBLICATION 95, MO-153 8308AGI www.icst.com/products/hiperclocks.html 13 REV. B JULY 25, 2005 ICS8308I Integrated Circuit Systems, Inc. LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER TABLE 8. ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature ICS8308AGI ICS8308AGI 24 Lead TSSOP tube -40°C to 85°C ICS8308AGIT ICS8308AGI 24 Lead TSSOP tape & reel -40°C to 85°C ICS8308AGILF ICS8308AGILF 24 Lead "Lead-Free" TSSOP tube -40°C to 85°C ICS8308AGILFT ICS8308AGILF 24 Lead "Lead-Free" TSSOP 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 configuraiton 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. 8308AGI www.icst.com/products/hiperclocks.html 14 REV. B JULY 25, 2005 Integrated Circuit Systems, Inc. ICS8308I LOW SKEW, 1-TO-8 DIFFERENTIAL/LVCMOS-TO-LVCMOS FANOUT BUFFER REVISION HISTORY SHEET Rev Table A B T4B T4E T 5B B T8 B T8 8308AGI Page 11 1 3 4 6 8 14 1 10 14 Description of Change Added Schematic Layout Features section - added mix supply voltage bullet. Added Mix Power Supply Table. Added Mix DC Characteristics Table. Added Mix AC Characteristics Table. Added Mix Output Load AC Test Circuit Diagram. Ordering Information Table - added "Lead-Free" par t number. Corrected Block Diagram, added CLK_SEL. Added "Recommendations for Unused Input and Output Pins". Ordering Information Table - added Lead-Free note. www.icst.com/products/hiperclocks.html 15 Date 4/16/04 10/20/04 1/12/05 7/25/05 REV. B JULY 25, 2005