8752CYT

ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER GENERAL DESCRIPTION The ICS8752 is a low voltage, low skew LVCMOS clock generator. With output frequencies up to 240MHz, the ICS8752 is targeted for high performance clock applcations. Along with a fully integrated PLL, the ICS8752 contains frequency configurable outputs and an external feedback input for regenerating clocks with “zero delay”. Dual clock inputs, CLK0 and CLK1, support redundant clock applications. The CLK_SEL input determines which reference clock is used. The output divider values of Bank A and B are controlled by the DIV_SELA0:1, and DIV_SELB0:1, respectively. For test and system debug purposes, the PLL_SEL input allows the PLL to be bypassed. When HIGH, the MR/nOE input resets the internal dividers and forces the outputs to the high impedance state. The low impedance LVCMOS outputs of the ICS8752 are designed to drive terminated transmission lines. The effective fanout of each output can be doubled by utilizing the ability of each output to drive two series terminated transmission lines. FEATURES • Fully integrated PLL • Eight LVCMOS outputs, 7Ω typical output impedance • Selectable LVCMOS CLK0 or CLK1 inputs for redundant clock applications • Input/Output frequency range: 18.33MHz to 240MHz at VCC = 3.3V ± 5% • VCO range: 220MHz to 480MHz • External feedback for “zero delay” clock regeneration • Cycle-to-cycle jitter: 75ps (maximum), (all outputs are the same frequency) • Output skew: 100ps (maximum) • Bank skew: 55ps (maximum) • Full 3.3V or 2.5V supply voltage • 0°C to 70°C ambient operating temperature • Available in both standard and lead-free RoHS-compliant packages BLOCK DIAGRAM PLL_SEL PLL FB_IN CLK0 0 CLK1 1 CLK_SEL DIV_SELA1 DIV_SELA0 00 01 10 11 PHASE DETECTOR VCO 1 0 ÷2 ÷4 ÷6 ÷8 ÷12 00 01 10 11 PIN ASSIGNMENT PLL_SEL GND GND VDDO QB3 QB2 VDD nc 32 31 30 29 28 27 26 25 QA0 QA1 QA2 QA3 DIV_SELB0 DIV_SELB1 DIV_SELA0 DIV_SELA1 MR/nOE CLK0 QB0 QB1 QB2 QB3 CLK_SEL VDDA VDD CLK1 GND QA0 QA1 VDDO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 24 23 22 GND QB1 QB0 VDDO VDDO QA3 QA2 GND ICS8752 21 20 19 18 17 GND FB_IN DIV_SELB1 DIV_SELB0 MR/nOE 32-Lead LQFP 7mm x 7mm x 1.4mm package body Y package Top View 8752CY www.idt.com 1 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 1. PIN DESCRIPTIONS Number 1, 2 3, 4 5 6 7, 13, 17, 24, 28, 29 8 9 10 11, 32 12 14, 15, 18, 19 16, 20, 21, 25 22, 23, 26, 27 30 31 Name DIV_SELB0, DIV_SELB1 DIV_SELA0, DIV_SELA1 MR/nOE CLK0 GND FB_IN CLK_SEL VDDA VDD CLK1 QA0, QA1, QA2, QA3 VDDO QB0, QB1, QB2, QB3 nc PLL_SEL Type Input Input Input Input Power Input Input Power Power Input Output Power Output Unused Input Pullup Pulldown Description Determines output divider values for Bank B as described in Table 3. Pulldown LVCMOS / LVTTL interface levels. Determines output divider values for Bank A as described in Table 3. Pulldown LVCMOS / LVTTL interface levels. When logic HIGH, the internal dividers are reset and the outputs are Pulldown disabled. When logic LOW, the master reset is disabled and the outputs are enabled. LVCMOS / LVTTL interface levels. Pulldown Clock input. LVCMOS / LVTTL interface levels. Power supply ground. Feedback input to phase detector for generating clocks with "zero delay". LVCMOS / LVTTL interface levels. Clock select input. Selects between CLK0 or CLK1 as phase detector Pulldown reference. When LOW, selects CLK0. When HIGH, selects CLK1. LVCMOS / LVTTL interface levels. Analog supply pin. Core supply pins. Pulldown Clock input. LVCMOS / LVTTL interface levels. Bank A clock outputs. 7Ω typical output impedance. LVCMOS / LVTTL interface levels. Output supply pins. Bank B clock outputs. 7Ω typical output impedance. LVCMOS / LVTTL interface levels. No connect. Selects between the PLL and CLK0 or CLK1 as the input to the dividers. When HIGH selects PLL. When LOW selects CLK0 or CLK1. LVCMOS / LVTTL interface levels. NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol CIN RPULLUP RPULLDOWN CPD ROUT Parameter Input Capacitance Input Pullup Resistor Input Pulldown Resistor Power Dissipation Capacitance (per output) Output Impedance Test Conditions Minimum Typical 4 51 51 VDDA, VDD, VDDO = 3.465V 23 7 Maximum Units pF kΩ kΩ pF Ω 8752CY www.idt.com 2 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 3. CONTROL INPUT FUNCTION TABLE Inputs DIV_ SELA1 X 0 0 1 1 0 0 1 1 0 0 1 1 Outputs DIV_ SELA0 X 0 1 0 1 0 1 0 1 0 1 0 1 DIV_ SELB1 X 0 0 1 1 0 0 1 1 0 0 1 1 DIV_ SELB0 X 0 1 0 1 0 1 0 1 0 1 0 1 QAx Hi-Z fVCO/2 fVCO/4 fVCO/6 fVCO/8 fCLK0/2 fCLK0/4 fCLK0/6 fCLK0/8 fCLK1/2 fCLK1/4 fCLK1/6 fCLK1/8 QBx Hi-Z fVCO/4 fVCO/6 fVCO/8 fVCO/12 fCLK0/4 fCLK0/6 fCLK0/8 fCLK0/12 fCLK1/4 fCLK1/6 fCLK1/8 fCLK1/12 MR/nOE 1 0 0 0 0 0 0 0 0 0 0 0 0 PLL_SEL X 1 1 1 1 0 0 0 0 0 0 0 0 CLK_SEL X X X X X 0 0 0 0 1 1 1 1 NOTE: For normal operation, MR/nOE is LOW. When MR/nOE is HIGH, all ouputs are disabled. TABLE 4A. QA OUTPUT FREQUENCY W/FB_IN = QB Inputs FB_IN DIV_ DIV_ SELB1 SELB0 QB Output Divider Mode (NOTE 2) CLK0, CLK1 (MHz) (NOTE 1) Minimum Maximum DIV_ SELA1 0 QB 0 0 ÷4 55 120 0 1 1 0 QB 0 1 ÷6 36.66 80 0 1 1 0 QB 1 0 ÷8 27.5 60 0 1 1 0 QB 1 1 ÷12 18.33 40 0 1 1 NOTE 1: VCO frequency range is 220MHz to 480MHz. NOTE 2: QA output frequency equal to CLKx frequency times the multiplier ; QB output frequency equal to CLKx. 8752CY Outputs DIV_ SELA0 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 QA Output Divider Mode ÷2 ÷4 ÷6 ÷8 ÷2 ÷4 ÷6 ÷8 ÷2 ÷4 ÷6 ÷8 ÷2 ÷4 ÷6 ÷8 QA Multiplier (NOTE 2) 2 1 0.667 0.5 3 1.5 1 0.75 4 2 1.33 1 6 3 2 1.5 www.idt.com 3 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 4B. QB OUTPUT FREQUENCY W/FB_IN = QA QA Output Divider Mode (NOTE 2) ÷2 Inputs CLK0, CLK1 (MHz) (NOTE 1) Minimum Maximum Outputs DIV_ SELB1 0 QA 0 0 110 240 (NOTE 3) 0 1 1 0 QA 0 1 ÷4 55 120 0 1 1 0 QA 1 0 ÷6 36.66 80 0 1 1 0 QA 1 1 ÷8 27.5 60 0 1 DIV_ SELB0 0 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 QB Output Divider Mode ÷4 ÷6 ÷8 ÷12 ÷4 ÷6 ÷8 ÷12 ÷4 ÷6 ÷8 ÷12 ÷4 ÷6 ÷8 ÷12 QB Multiplier (NOTE 2) 0.5 0.333 0.25 0.167 1 0.667 0.5 0.333 1.5 1 0.75 0.5 2 1.333 1 0.667 FB_IN DIV_ SELA1 DIV_ SELA0 1 NOTE 1: VCO frequency range is 220MHz to 480MHz. NOTE 2: QB output frequency equal to CLKx frequency times the multiplier ; QA output frequency equal to CLKx. NOTE 3: Maximum frequency of 240MHz valid for VCC = 3.3V ± 5% only. 8752CY www.idt.com 4 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD Inputs, VI Outputs, VO Package Thermal Impedance, θJA Storage Temperature, TSTG 4.6V -0.5V to VDD + 0.5V -0.5V to VDDO + 0.5V 47.9°C/W (0 lfpm) -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 5A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5%, TA = 0°C TO 70°C Symbol VDD VDDA VDDO IDD IDDA IDDO Parameter Core Supply Voltage Analog Supply Voltage Output Supply Voltage Power Supply Current Analog Supply Current Output Supply Current Test Conditions Minimum 3.135 3.135 3.135 Typical 3.3 3.3 3.3 Maximum 3.465 3.465 3.465 105 15 20 Units V V V mA mA mA TABLE 5B. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = VDDO = 2.5V±5%, TA = 0°C TO 70°C Symbol VDD VDDA VDDO IDD IDDA IDDO Parameter Core Supply Voltage Analog Supply Voltage Output Supply Voltage Power Supply Current Analog Supply Current Output Supply Current Test Conditions Minimum 2.375 2.375 2.375 Typical 2.5 2.5 2.5 Maximum 2.625 2.625 2.625 100 15 20 Units V V V mA mA mA 8752CY www.idt.com 5 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 5B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5% OR 2.5V±5%, TA = 0°C TO 70°C Symbol VIH VIL Parameter Input High Voltage Input Low Voltage DIV_ SELx0, DIV_SELx1, CLK0, CLK1, FB_IN, CLK_SEL, Input High Current MR/nOE PLL_SEL DIV_ SELx0, DIV_SELx1, CLK0, CLK1, FB_IN, CLK_SEL, MR/nOE PLL_SEL VOH Output High Voltage; NOTE 1 Test Conditions VDD = 3.3V VDD = 2.5V VDD = 3.3V VDD = 2.5V VDD = VIN = 3.465V or 2.625V VDD = VIN = 3.465V or 2.625V VDD = 3.465V or 2.625V, VIN = 0V VDD = 3.465V or 2.625V, VIN = 0V VDDO = VIN = 3.465V VDDO = VIN = 2.625V -5 Minimum 2 1.7 -0.3 -0.3 Typical Maximum VDD + 0.3 VDD + 0.3 0.8 0.7 150 Units V V V V µA IIH 5 µA µA IIL Input Low Current -150 2.6 1.8 0.5 µA V V V VOL Output Low Voltage; NOTE 1 NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement Information section, "Output Load Test Circuit" diagrams. TABLE 6A. PLL INPUT REFERENCE CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5%, TA = 0°C TO 70°C Symbol Parameter Input Reference Frequency NOTE: Input reference frequency is limited by fREF the divider selection and the VCO lock range. Test Conditions Minimum 20 Typical Maximum 240 Units MHz TABLE 6B. PLL INPUT REFERENCE CHARACTERISTICS, VDD = VDDA = VDDO = 2.5V±5%, TA = 0°C TO 70°C Symbol Parameter Input Reference Frequency NOTE: Input reference frequency is limited by fREF the divider selection and the VCO lock range. Test Conditions Minimum 20 Typical Maximum 120 Units MHz 8752CY www.idt.com 6 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 7A. AC CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5%, TA = 0°C TO 70°C Symbol Parameter Test Conditions ÷2 ÷4 fOUT Output Frequency (PLL Mode) ÷6 ÷8 ÷12 fVCO t(Ø) PLL VCO Lock Range Static Phase Offset; NOTE 1 Bank Skew; NOTE 2, 4 Output Skew; NOTE 3, 4 Cycle-to-Cycle Jitter ; NOTE 4 PLL Lock Time Output Rise/Fall Time 20% to 80% 400 Different Frequencies on Different Banks All Outputs at Same Frequency fVCO = 400MHz, Feedback ÷ 8 Measured on rising edge at VDDO/2 Measured on rising edge at VDDO/2 Minimum 110 55 36.67 27.5 18.33 220 -30 70 Typical Maximum 240 120 80 60 40 480 170 55 100 400 75 1 950 Units MHz MHz MHz MHz MHz MHz ps ps ps ps ps mS ps % tsk(b) tsk(o) tjit(cc) tL tR / tF odc Output Duty Cycle 47 50 53 All parameters measured at fMAX unless noted otherwise. NOTE 1: Defined as the time difference between the input clock and the average feedback input signal, when the PLL is locked and the input reference frequency is stable. NOTE 2: Defined as skew within a bank of outputs at the same supply voltages and with equal load conditions. NOTE 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 4: This parameter is defined in accordance with JEDEC Standard 65. 8752CY www.idt.com 7 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 7B. AC CHARACTERISTICS, VDD = VDDA = VDDO = 2.5V±5%, TA = 0°C TO 70°C Symbol Parameter Test Conditions ÷2 ÷4 fOUT Output Frequency (PLL Mode) ÷6 ÷8 ÷12 fVCO t(Ø) PLL VCO Lock Range Static Phase Offset; NOTE 1 Bank Skew; NOTE 2, 4 Output Skew; NOTE 3, 4 Cycle-to-Cycle Jitter ; NOTE 4 PLL Lock Time Output Rise/Fall Time 20% to 80% 400 Different Frequencies on Different Banks All Outputs at Same Frequency fVCO = 400MHz Feedback ÷ 8 Measured on rising edge at VDDO/2 Measured on rising edge at VDDO/2 Minimum 110 55 36.67 27.5 18.33 220 -90 50 Typical Maximum 240 120 80 60 40 480 190 55 90 400 75 1 950 Units MHz MHz MHz MHz MHz MHz ps ps ps ps ps mS ps % tsk(b) tsk(o) tjit(cc) tL tR / tF odc Output Duty Cycle 45 50 55 All parameters measured at fMAX unless noted otherwise. NOTE 1: Defined as the time difference between the input clock and the average feedback input signal, when the PLL is locked and the input reference frequency is stable. NOTE 2: Defined as skew within a bank of outputs at the same supply voltages and with equal load conditions. NOTE 3: Defined as skew between outputs at the same supply voltage and with equal load conditions. Measured at VDDO/2. NOTE 4: This parameter is defined in accordance with JEDEC Standard 65. 8752CY www.idt.com 8 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER PARAMETER MEASUREMENT INFORMATION 1.65V±5% 1.25V±5% VDD, VDDA,VDDO SCOPE Qx VDD, VDDA,V DDO SCOPE Qx LVCMOS GND LVCMOS GND -1.65V±5% -1.25V±5% 3.3V OUTPUT LOAD AC TEST CIRCUIT (Where X denotes outputs in the same Bank) 2.5V OUTPUT LOAD AC TEST CIRCUIT V DDO Qx 2 QX0:QX3 VDDO 2 V DDO Qy 2 t sk(o) QX0:QX3 t sk(b) VDDO 2 OUTPUT SKEW BANK SKEW V DDO V DDO V DDO VDD QA0:QA3, QB0:QB3 ➤ QA0:QA3, QB0:QB3 8752CY 2 2 2 CLK0, CLK1 2 tcycle n ➤ ➤ t (Ø) 1000 Cycles CYCLE-TO-CYCLE JITTER V DDO STATIC PHASE OFFSET 2 t PW t PERIOD Clock Outputs 20% tR tF odc = t PW t PERIOD x 100% OUTPUT DUTY CYLCLE/PULSE WIDTH/PERIOD 9 OUTPUT RISE/FALL TIME www.idt.com REV. C JULY 2, 2010 ➤ t jit(cc) = tcycle n –tcycle n+1 ➤ tcycle n+1 ➤ FB_IN VDD 2 80% 80% 20% ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER APPLICATION INFORMATION RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS INPUTS: OUTPUTS: CLK INPUT: For applications not requiring the use of a clock input, 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 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. LVCMOS OUTPUT: All unused LVCMOS output can be left floating. We recommend that there is no trace attached. RELIABILITY INFORMATION TABLE 7. 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 55.9°C/W 42.1°C/W 500 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 ICS8752 is: 1546 8752CY www.idt.com 10 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER PACKAGE OUTLINE - Y SUFFIX FOR 32 LEAD LQFP TABLE 8. PACKAGE DIMENSIONS JEDEC VARIATION ALL DIMENSIONS IN MILLIMETERS BBA SYMBOL N A A1 A2 b c D D1 D2 E E1 E2 e L θ ccc 0.45 0° --0.05 1.35 0.30 0.09 MINIMUM NOMINAL 32 --1.40 0.37 -9.00 BASIC 7.00 BASIC 5.60 Ref. 9.00 BASIC 7.00 BASIC 5.60 Ref. 0.80 BASIC 0.60 --0.75 7° 0.10 1.60 0.15 1.45 0.45 0.20 MAXIMUM Reference Document: JEDEC Publication 95, MS-026 8752CY www.idt.com 11 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER TABLE 9. ORDERING INFORMATION Part/Order Number 8752CY 8752CYT 8752CYLF 8752CYLFT Marking ICS8752CY ICS8752CY ICS8752CYLF ICS8752CYLF Package 32 Lead LQFP 32 Lead LQFP 32 Lead "Lead-Free" LQFP 32 Lead "Lead-Free" LQFP Shipping Packaging tray 1000 tape & reel tray 1000 tape & reel Temperature 0°C to 70°C 0°C to 70°C 0°C to 70°C 0°C to 70°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, Inc. (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. 8752CY www.idt.com 12 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER REVISION HISTORY SHEET Rev A Table T1 Page 2 1 B T2 T9 T1 T9 T9 2 12 2 10 12 12 14 Description of Change Pin Descriptions Table. Revised MR/nOE description. Features Section - delete bullet, "Industrial temperature available upon request." Added Lead-Free bullet. Pin Characteristics table - changed CIN 4pF max. to 4pF typical. Ordering Information Table -added Lead-Free par t number and note. Updated data sheet format. Pin Description Table - correct Pin 5, MR/nOE. Added Recommendations for Unused Input and Output Pins. Ordering Information Table - added lead-free marking. Updated datasheet's header/footer with IDT from ICS. Removed ""ICS"" prefix from Par t/Order Number column. Added Contact Page. Date 8/19/02 3/31/05 B B C 5/2/05 10/19/05 7/2/10 8752CY www.idt.com 13 REV. C JULY 2, 2010 ICS8752 LOW SKEW, 1-TO-8 LVCMOS CLOCK MULTIPLIER/ZERO DELAY BUFFER We’ve Got Your Timing Solution. 6024 Silver Creek Valley Road San Jose, CA 95138 Sales 800-345-7015 (inside USA) +408-284-8200 (outside USA) Fax: 408-284-2775 Tech Support netcom@idt.com © 2010 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. 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 8752CY www.idt.com 14 REV. C JULY 2, 2010