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| VT73227 VCXO (Voltage-Controlled Crystal Oscillator) 27 MHz 3.3V Applications *= *= Set-top boxes Telecom switching *= *= Oscillator replacement MPEG Video clock source General Description The Vaishali VT73227 is a single-chip, low-jitter Voltage-Controlled-Crystal-Oscillator. The device accepts a 27 MHz, 20 pF (pull range of 200 ppm) crystal input, and produces a low jitter output at the same frequency. A 0 to 3.0V control signal is used to fine tune the output clock frequency in the 100ppm range. Features *= *= *= 3.3V operating voltage Uses inexpensive pullable crystal 12mA drive capability at TTL levels *= *= On-chip oscillator with 200 ppm pull range (100 ppm) 8 pin SOIC package Figure 1. Functional Block Diagram VDD1 VDD2 VIN X2 27 MHz Pullable Crystal Load Cap Control Output Buffer Load Caps Oscillator CLK1 X1 GND1 GND2 2001-04-02 Vaishali Semiconductor 1300 White Oaks Road, Ste. 200 Page 1 Campbell CA 95008 Ph. 408.377.6060 MDST-0006-03 Fax 408.377.6063 VT73227 Figure 2. Pin Configuration X1 VDD1 VIN GND2 1 2 3 4 VT73227 8 7 6 5 X2 GND1 VDD2 CLK 8 pin (150 mil) SOIC Table 1. Pin Description Name X1 VDD1 VIN GND2 CLK VDD2 GND1 X2 1 2 3 4 5 6 7 8 Pin # Type Xi P I P O P P Xi Core VDD. Connect to 3.3V Description Crystal connection. Connect to a 27 MHz pullable crystal Voltage input to VCXO. Zero to 3.3V signal controls the frequency of the VCXO. Connect to ground. Clock output Pad driver VDD . Connect to 3.3V Connect to ground. Crystal connection. Connect to a 27 MHz pullable crystal. Legend: I = Input O = Output P = Power supply connection Xi = Crystal connections. Table 2. Absolute Maximum Ratings Parameter Supply voltage, VDD Inputs and Clock Outputs Soldering Temperature Storage temperature Conditions Referenced to GND Referenced to GND Max of 10 seconds Min -0.5 Typ 7 Max VDD+0.5 260 Units V V C C -65 150 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and correct functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. Table 3. Operating Conditions Parameter Operating Voltage, VDD Input High Voltage, VIH, X1 pin only Input Low Voltage, VIL, X1 pin only Operating Temperature Input crystal accuracy VCXO control voltage, VIN 2001-04-02 Vaishali Semiconductor 1300 White Oaks Road, Ste. 200 Page 2 Campbell CA 95008 Ph. 408.377.6060 Conditions Min 3.15 2.5 Typ 3.3 Max 3.45 Units V V 0.4 0 70 30 0 3.3 V C ppm V MDST-0006-03 Fax 408.377.6063 VT73227 Table 4. DC Electrical Characteristics TA = 0C to +70C, VDD = 3.15 V to 3.45 V Parameter Output High Voltage, VOH Output Low Voltage, VOL Operating Supply Current, IDD Short Circuit Current Input Capacitance Note: 1. Typical values are at VDD = 3.3V and 25C Condition IOH=-12mA IOL=12mA No Load Each output Min 2.4 Typ (1) Max 0.4 Units V V mA mA pF 25 85 7 Table 5. AC Electrical Characteristics TA = 0C to +70C, VDD = 3.15 V to 3.45 V Symbol fosc tr tf tod tjit (pk - pk) Parameter Input Crystal Frequency Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter (Peak to Peak) Output pullability Condition 0.8 to 2.0V 2.0 to 0.8V At VDD/2 Min Typ 27 Max 1.5 1.5 Units MHz ns ns % ps 40 60 150 0V ppm Note: 1. Typical values are at VDD = 3.3V and 25C Table 6 Pullable Crystal Specifications Parameter Correlation (Load) Capacitance Capacitance Ratio ESR Initial Accuracy Temperature and Aging Stability CL CO/C1 Symbol Value 20pF 240 max 50 max 30ppm 50ppm Ordering Information VT73227 Part Number VT73227-S1 VT73227-S1X VT73227-/D Marking VT73227-S1 VT73227-S1 Shipping/Packaging Tubes Tape & Reel Die Page 3 1300 White Oaks Road, Ste. 200 Campbell CA 95008 Ph. 408.377.6060 No. of Pins 8 8 Package SOIC SOIC Temperature o o 0 C to +70 C o o 0 C to +70 C o o 0 C to +70 C 2001-04-02 Vaishali Semiconductor MDST-0006-03 Fax 408.377.6063 |
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