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| PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT FEATURES * One LVCMOS/LVTTL output, 15 output impedence * Crystal oscillator interface designed for 19.44MHz, 18pF parallel resonant crystal * Output frequency: 77.76MHz * Random jitter: 2.82ps (typical) * Deterministic jitter: 0.205ps (typical) * 3.3V operating supply * 0C to 70C ambient operating temperature * Available in both standard and lead-free RoHS-compliant packages GENERAL DESCRIPTION The ICS840-77 is a SONET Oscillator Replacement and a member of the HiPerClocks TM HiPerClockSTM family of high performance devices from ICS. The ICS840-77 uses a 19.44MHz crystal to synthesize 77.76MHz. The ICS840-77 has excellent jitter performance. The ICS840-77 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. IC S www..com BLOCK DIAGRAM OE Pullup 77.76MHz 19.44MHz PIN ASSIGNMENT Q0 VDD XTAL_OUT XTAL_IN OE 1 2 3 4 8 7 6 5 Q1 Q0 VDDO GND XTAL_IN Clock Synthesizer Q1 ICS840-77 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View XTAL_OUT ICS840-77 8-Lead SOIC 3.90mm x 4.92mm x 1.37mm body package M Package Top View The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice. 840AG-77 www.icst.com/products/hiperclocks.html REV. A NOVEMBER 7, 2005 1 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT Type Power Input Input Power Power Pullup Description Power supply pin. Cr ystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output. Output enable pin. When HIGH, outputs are enabled. When LOW, forces outputs to HiZ state. LVCMOS/LVTTL interface levels. Power supply ground. TABLE 1. PIN DESCRIPTIONS Number 1 2, 3 4 5 www..com 6 Name VDD XTAL_OUT, XTAL_IN OE GND VDDO Output supply pin. Single-ended clock outputs. LVCMOS/LVTTL interface levels. 7, 8 Q0, Q1 Output 15 output impedence. NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol CIN RPULLUP ROUT Parameter Input Capacitance Input Pullup Resistor Output Impedance Test Conditions Minimum Typical 4 51 15 Maximum Units pF k TABLE 3. CONTROL FUNCTION TABLE Control Inputs OE 0 1 Output Q0, Q1 Hi-Z Active 840AG-77 www.icst.com/products/hiperclocks.html 2 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT 4.6V -0.5V to VDD + 0.5 V -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. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD Inputs, VI Outputs, VO Package Thermal Impedance, JA 8 Lead TSSOP 101.7C/W (0 mps) 8 Lead SOIC www..com Storage Temperature, TSTG 112.7C/W (0 lfpm) -65C to 150C TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 3.3V0.3V, TA = 0C TO 70C Symbol VDD VDDO IDD IDDO Parameter Power Supply Voltage Output Supply Voltage Power Supply Current Output Supply Current OE = VDD (output enabled) Test Conditions Minimum 3.0 3.0 Typical 3.3 3.3 TBD TBD Maximum 3.6 3.6 Units V V mA TABLE 4B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDO = 3.3V0.3V, TA = 0C TO 70C Symbol VIH VIL IIH IIL VOH Parameter Input High Voltage Input Low Voltage Input High Current Input Low Current Output High Voltage; NOTE 1 VDD = VIN = 3.6V VDD = 3.6V, VIN = 0V -150 2.6 0.5 Test Conditions Minimum 2 -0.3 Typical Maximum VDD + 0.3 0.8 5 Units V V A A V V Output Low Voltage; NOTE 1 VOL NOTE 1: Outputs terminated with 50 to VDDO/2. See Parameter Measurement Information Section, "3.3V Output Load Test Circuit". TABLE 5. CRYSTAL CHARACTERISTICS Parameter Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitance Drive Level Test Conditions Minimum Typical Fundamental 19.44 TBD 7 TBD MHz pF W Maximum Units 840AG-77 www.icst.com/products/hiperclocks.html 3 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT Test Conditions Minimum Typical 77.76 0.205 2.82 2.85 2.18 n = 2 to 50000 cycles Time at minimum operating voltage to be 0 s 20% to 80% 650 50 4. 0 10 Maximum Units MHz ps ps ps ps ps ms ps % TABLE 6. AC CHARACTERISTICS, VDD = VDDO = 3.3V0.3V, TA = 0C TO 70C Symbol fOUT tDJ tRJ tRMS tp-p www..com tacc tOSC t R / tF Parameter Output Frequency Deterministic Jitter ; NOTE 1 Random Jitter ; NOTE 1 RMS of Total Distribution (); NOTE 1 Peak-to-Peak Jitter ; NOTE 1 Accumulated Jitter (); NOTE 1 Oscillation Star t Up Time Output Rise/Fall Time odc Output Duty Cycle NOTE 1: Measured using Wavecrest SIA-3000. 840AG-77 www.icst.com/products/hiperclocks.html 4 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT PARAMETER MEASUREMENT INFORMATION 1.65V 0.15V V DDO VDD, VDDO www..com SCOPE Qx Q0, Q1 t PW t 2 LVCMOS GND PERIOD odc = -1.65V 0.15V t PW t PERIOD x 100% 3.3V OUTPUT LOAD AC TEST CIRCUIT OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD 80% 20% tR 80% 20% tF Clock Outputs OUTPUT RISE/FALL TIME 840AG-77 www.icst.com/products/hiperclocks.html 5 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT APPLICATION INFORMATION RECOMMENDATIONS FOR UNUSED INPUT www..com INPUTS: AND OUTPUT PINS OUTPUTS: LVCMOS OUTPUT: All unused LVCMOS output can be left floating. We recommend that there is no trace attached. CRYSTAL INPUT: For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. Though not required, but for additional protection, a 1k resistor can be tied from XTAL_IN 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 1k resistor can be used. CRYSTAL INPUT INTERFACE The ICS840-77 has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 1 below were determined using a 19.44MHz, 18pF parallel resonant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. XTAL_OUT C1 12p X1 18pF Parallel Cry stal XTAL_IN C2 12p Figure 1. CRYSTAL INPUt INTERFACE 840AG-77 www.icst.com/products/hiperclocks.html 6 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT RELIABILITY INFORMATION TABLE 7A. JAVS. AIR FLOW TABLE FOR 8 LEAD TSSOP www..com JA by Velocity (Meters per Second) 0 1 90.5C/W 2.5 89.8C/W Multi-Layer PCB, JEDEC Standard Test Boards 101.7C/W TABLE 7B. JAVS. AIR FLOW TABLE 8 LEAD SOIC JA by Velocity (Linear Feet per Minute) 0 Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 153.3C/W 112.7C/W 200 128.5C/W 103.3C/W 500 115.5C/W 97.1C/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 ICS840-77 is: 2423 840AG-77 www.icst.com/products/hiperclocks.html 7 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT 8 LEAD TSSOP PACKAGE OUTLINE - M SUFFIX FOR 8 LEAD SOIC PACKAGE OUTLINE - G SUFFIX FOR www..com TABLE 8A. PACKAGE DIMENSIONS SYMBOL N A A1 A2 b c D E E1 e L aaa 0.45 0 -4.30 0.65 BASIC 0.75 8 0.10 -0.05 0.80 0.19 0.09 2.90 6.40 BASIC 4.50 Millimeters Minimum 8 1.20 0.15 1.05 0.30 0.20 3.10 Maximum TABLE 8B. PACKAGE DIMENSIONS SYMBOL N A A1 B C D E e H h L 5.80 0.25 0.40 0 1.35 0.10 0.33 0.19 4.80 3.80 1.27 BASIC 6.20 0.50 1.27 8 Millimeters MINIMUM 8 1.75 0.25 0.51 0.25 5.00 4.00 MAXIMUM Reference Document: JEDEC Publication 95, MS-012 Reference Document: JEDEC Publication 95, MO-153 840AG-77 www.icst.com/products/hiperclocks.html 8 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT Marking 40A77 40A77 TBD TBD TBD TBD TBD TBD Package 8 lead TSSOP 8 lead TSSOP 8 lead "Lead-Free" TSSOP 8 lead "Lead-Free" TSSOP 8 lead SOIC 8 lead SOIC 8 lead "Lead-Free" SOIC 8 lead "Lead-Free" SOIC Shipping Packaging tube 2500 tape & reel tube 2500 tape & reel tube 2500 tape & reel tube 2500 tape & reel Temperature 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C 0C to 70C TABLE 9. ORDERING INFORMATION Part/Order Number ICS840AG-77 ICS840AG-77T ICS840AG-77LF ICS840AG-77LFT ICS840AM-77 www..com840AM-77T ICS ICS840AM-77LF ICS840AM-77LFT 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 applications. Any other applications such as those requiring extended temperature range, 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. 840AG-77 www.icst.com/products/hiperclocks.html 9 REV. A NOVEMBER 7, 2005 |
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