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| Multimedia ICs Clock generator for personal computers BU2192F The BU2192F is a clock generator IC for personal computers, and uses a single crystal resonator to generate the three clock signals needed for personal computers. *Applications Personal computers *Features of two different types can be generat1) Clock signals ed with a single attached crystal generator. 2) Internal PLL loop filter, eliminating the need for an attached component. 3) Single 5V power supply. 4) SOP 8-pin package. *Block diagram XTAL1 14.3181MHz XTAL OSC CLK1 1/2 PLL1 DATA1 33.8680MHz CLK2 1/4 DATA2 PLL2 24.5795MHz VREF 1 Multimedia ICs BU2192F *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Pin name CLK2 GND XTAL I N.C. CLK1 N.C. DVDD AVDD Digital power supply Analog power supply Clock output 1 (f1 = 33.8680MHz) -- Clock output 2 (f2 = 24.5795MHz) GND Reference oscillation input -- Function Circuit A -- B -- A -- -- -- *Input / output circuits Type A Type B Pin From inside Pin To inside 1*5 3 *Absolute maximum ratings (Ta = 25C) Parameter Applied voltage Input voltage Storage temperature Power dissipation Symbol VDD VIN Tstg Pd Limits - 0.5 ~ + 7.0 - 0.5 ~ VDD + 0.5 - 30 ~ + 125 450 Unit V V C mW Do not represent guaranteed performance. Reduced by 4.5mW for each increase in Ta of 1C over 25C. Not designed for radiation resistance. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Input high level voltage Input low level voltage Operating temperature Output load Symbol VDD VIH VIL Topr CL Limits - 4.5 ~ + 5.5 0.8 x VDD ~ VDD 0.0 ~ 0.2 x VDD - 5 ~ + 70 15 (Max.) Unit V V V C pF 2 Multimedia ICs otherwise noted, Ta *Electrical characteristics (unless[fREF] = 14.3181MHz)= 0 to 70C, VDD (AVDD) = 4.5V to 5.5V, CL XTALI Parameter Input Vth XTALI Output low level voltage Output high level voltage Operating circuit current Output frequency 1 Output frequency 2 Rise time Fall time Jitter Jitter Power up time Duty Symbol Vth VOL VOH IDD f1 f2 tR tF J1s Jabs tPT Duty Min. 0.8 -- VDD - 0.5 -- Typ. -- -- -- 30 Max. 2.2 0.4 -- 50 Unit V V V mA MHz MHz nsec nsec psec nsec msec % lOL = 4.0mA lOL = - 4.0mA fREF = 14.3181MHz, no load fREF x 123 / 26 / 2 fREF x 103 / 15 / 4 VDD x 0.2 to VDD x 0.8 VDD x 0.8 to VDD x 0.2 1sigma MIN-MAX width BU2192F 15pF, Conditions -- - 100ppm 33.8680 + 100ppm - 100ppm 24.5795 + 100ppm -- -- -- -- -- 45 -- -- 80 300 -- 50 5 5 250 1 10 55 Measure with Vth = 1 / 2VDD The time for the output to stabilize after the power supply reaches 90% after being turned on. However, if the power supply rise (to rise condition) takes the entire time, this requirement is satisfied. *Application example 24.5795MHz 1 CLK2 AVDD 8 0.1F 2 GND DVDD 7 3 fREF = 14.3181MHz XTALI N.C. 6 4 N.C. CLK1 5 33.8680MHz 3 Multimedia ICs BU2192F *External dimensions (Units: mm) 5.0 0.2 8 6.2 0.3 4.4 0.2 5 1.5 0.1 1 4 0.11 1.27 0.4 0.1 0.3Min. 0.15 SOP8 4 0.15 0.1 |
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