PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT GENERAL DESCRIPTION FEATURES The ICS840-77 is a SONET Oscillator Replacement and a member of the HiPerClocks TM HiPerClockS™ 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. • One LVCMOS/LVTTL output, 15Ω output impedence ICS • 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 • 0°C to 70°C ambient operating temperature • Available in both standard and lead-free RoHS-compliant packages BLOCK DIAGRAM OE PIN ASSIGNMENT Pullup VDD XTAL_OUT XTAL_IN OE 77.76MHz Q0 19.44MHz XTAL_IN Clock Synthesizer 1 2 3 4 8 7 6 5 Q1 Q0 VDDO GND ICS840-77 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View XTAL_OUT Q1 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 TABLE 1. PIN DESCRIPTIONS Number Name 1 VDD XTAL_OUT, XTAL_IN Power 4 OE Input 5 GND Power 6 VDDO Power 2, 3 Type Description Input Pullup 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. Output supply pin. Single-ended clock outputs. LVCMOS/LVTTL interface levels. 7, 8 Q0, Q1 Output 15Ω output impedence. NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter Test Conditions CIN Input Capacitance RPULLUP ROUT Minimum Typical Maximum Units 4 pF Input Pullup Resistor 51 kΩ Output Impedance 15 Ω TABLE 3. CONTROL FUNCTION TABLE Control Inputs Output OE Q0, Q1 840AG-77 0 Hi-Z 1 Active 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 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 device. These ratings are stress specifications only. Functional operation of product at these conditions or any condi- Package Thermal Impedance, θJA 8 Lead TSSOP 101.7°C/W (0 mps) tions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maxi- 8 Lead SOIC 112.7°C/W (0 lfpm) Storage Temperature, TSTG -65°C to 150°C mum rating conditions for extended periods may affect product reliability. NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDO = 3.3V±0.3V, TA = 0°C TO 70°C Symbol Parameter VDD Power Supply Voltage VDDO Output Supply Voltage IDD Power Supply Current IDDO Output Supply Current Test Conditions Minimum Typical Maximum Units 3.0 3.3 3.6 V 3.3 3.6 3.0 OE = VDD (output enabled) TBD V mA TBD TABLE 4B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDO = 3.3V±0.3V, TA = 0°C TO 70°C Symbol Parameter VIH Input High Voltage Test Conditions VIL Input Low Voltage IIH Input High Current VDD = VIN = 3.6V IIL Input Low Current VDD = 3.6V, VIN = 0V VOH Output High Voltage; NOTE 1 Minimum Typical Maximum Units 2 VDD + 0.3 V -0.3 0.8 V 5 µA -150 µA 2.6 V Output Low Voltage; NOTE 1 VOL NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement Information Section, "3.3V Output Load Test Circuit". 0.5 V Maximum Units TABLE 5. CRYSTAL CHARACTERISTICS Parameter Test Conditions Minimum Mode of Oscillation Typical Fundamental Frequency 19.44 Equivalent Series Resistance (ESR) TBD Shunt Capacitance Drive Level 840AG-77 www.icst.com/products/hiperclocks.html 3 MHz Ω 7 pF TBD µW REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840-77 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT TABLE 6. AC CHARACTERISTICS, VDD = VDDO = 3.3V±0.3V, TA = 0°C TO 70°C Symbol Parameter Test Conditions Minimum Typical Maximum Units fOUT Output Frequency 77.76 MHz tDJ Deterministic Jitter ; NOTE 1 0.205 ps tRJ 2.82 ps 2.85 ps 2.18 ps tacc Random Jitter ; NOTE 1 RMS of Total Distribution (σ); NOTE 1 Peak-to-Peak Jitter ; NOTE 1 Accumulated Jitter (σ); NOTE 1 4. 0 ps tOSC Oscillation Star t Up Time t R / tF Output Rise/Fall Time tRMS tp-p n = 2 to 50000 cycles Time at minimum operating voltage to be 0 s 20% to 80% odc Output Duty Cycle NOTE 1: Measured using Wavecrest SIA-3000. 840AG-77 www.icst.com/products/hiperclocks.html 4 10 ms 650 ps 50 % 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 SCOPE VDD, VDDO 2 Q0, Q1 t PW t Qx LVCMOS GND odc = PERIOD t PW x 100% t PERIOD -1.65V ± 0.15V 3.3V OUTPUT LOAD AC TEST CIRCUIT 80% Clock Outputs OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD 80% 20% 20% tR tF 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 INPUTS: AND OUTPUT PINS OUTPUTS: 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 1kΩ resistor can be tied from XTAL_IN to ground. LVCMOS OUTPUT: All unused LVCMOS output can be left floating. We recommend that there is no trace attached. 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. CRYSTAL INPUT INTERFACE lel resonant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. 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 paral- 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. θJAVS. AIR FLOW TABLE FOR 8 LEAD TSSOP θJA by Velocity (Meters per Second) Multi-Layer PCB, JEDEC Standard Test Boards 0 1 2.5 101.7°C/W 90.5°C/W 89.8°C/W TABLE 7B. θJAVS. AIR FLOW TABLE 8 LEAD SOIC θJA by Velocity (Linear Feet per Minute) Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 0 200 500 153.3°C/W 112.7°C/W 128.5°C/W 103.3°C/W 115.5°C/W 97.1°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 ICS840-77 is: 2423 840AG-77 www.icst.com/products/hiperclocks.html 7 REV. A NOVEMBER 7, 2005 PRELIMINARY Integrated Circuit Systems, Inc. PACKAGE OUTLINE - G SUFFIX 77.76MHZ, LVCMOS/LVTTL OSCILLATOR REPLACEMENT FOR 8 LEAD TSSOP PACKAGE OUTLINE - M SUFFIX FOR 8 LEAD SOIC TABLE 8A. PACKAGE DIMENSIONS SYMBOL TABLE 8B. PACKAGE DIMENSIONS Millimeters Minimum N A ICS840-77 SYMBOL Maximum 8 Millimeters MINIMUM N MAXIMUM 8 -- 1.20 A 1.35 1.75 0.25 A1 0.05 0.15 A1 0.10 A2 0.80 1.05 B 0.33 0.51 b 0.19 0.30 C 0.19 0.25 c 0.09 0.20 D 4.80 5.00 D 2.90 3.10 E 3.80 4.00 E E1 6.40 BASIC 4.30 e e 4.50 0.65 BASIC 1.27 BASIC H 5.80 6.20 h 0.25 0.50 L 0.45 0.75 L 0.40 1.27 α 0° 8° α 0° 8° aaa -- 0.10 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 TABLE 9. ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature ICS840AG-77 40A77 8 lead TSSOP tube 0°C to 70°C ICS840AG-77T 40A77 8 lead TSSOP 2500 tape & reel 0°C to 70°C ICS840AG-77LF TBD 8 lead "Lead-Free" TSSOP tube 0°C to 70°C ICS840AG-77LFT TBD 8 lead "Lead-Free" TSSOP 2500 tape & reel 0°C to 70°C ICS840AM-77 TBD 8 lead SOIC tube 0°C to 70°C ICS840AM-77T TBD 8 lead SOIC 2500 tape & reel 0°C to 70°C ICS840AM-77LF TBD 8 lead "Lead-Free" SOIC tube 0°C to 70°C ICS840AM-77LFT TBD 8 lead "Lead-Free" SOIC 2500 tape & reel 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. 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