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| Multimedia ICs Clock generator for HDD BU2191F The BU2191F is a clock generator IC for hard disk drives, and uses a single crystal resonator to generate the three clock signals needed for hard disk drives. *Applications Hard disk drives *Features of three different frequencies can be 1) Clock signals generated with a single attached crystal resonator. 2) Internal loop filter, eliminating the need for an attached loop. 3) Single 5.0V power supply. 4) SOP 8-pin package. *Block diagram XTAL 1 XTAL OSC XTAL 0 15.0000MHz PLL 1 DATA 1 1/2 32.0000MHz BCLK 15.0000MHz CLK 1 CLK 2 PLL 2 DATA 2 1/2 40.0000MHz Vref 1 Multimedia ICs BU2191F *Pin descriptions Pin No. 1 2 3 4 5 6 7 8 Pin name CLK2 GND XTALI XTALO BCLK CLK1 VDD AVDD Clock output 2 (f2 = 40MHz) Ground Reference oscillation input Reference oscillation output Reference oscillation buffer output (fBCLK = 15MHz) Clock output 1 (f1 = 32MHz) VDD Analog power supply Function Circuit A -- B B A A -- -- *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 Does 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 0.8VDD ~ VDD 0.0 ~ 0.2VDD - 5 ~ + 70 15 (Max.) Unit V V V C pF 2 Multimedia ICs BU2191F *Input / output circuits Type A Type B Pin Pin From inside Pin To inside *Electrical characteristics (unless otherwise noted, Ta = 25C, AVDD = 5.0V, DVDD = 5.0V) Parameter Output low level voltage Output high level voltage Operating supply current Reference frequency (1) Output frequency Output frequency Output frequency Rise time Fall time Jitter Jitter 3s Power up time Duty (1) (2) (3) Symbol VOL VOH IDD fREF fBCK f1 f2 fR fF Jcy J3s tPT Duty Min. -- VDD - 0.5 -- -- 14.997 31.994 39.992 -- -- - 250 -- -- 45 Typ. -- -- 30 15.0000 15.0000 32.0000 40.0000 -- -- -- -- -- 50 Max. 0.4 -- 50 -- 15.003 32.006 40.008 5 5 250 1 10 55 Unit V V mA MHz MHz MHz MHz nsec nsec psec nsec msec % Measure at 1.4V (Vth) fREF x 128 / 15 / 4 fREF x 16 / 3 / 2 VDD x 0.2 to VDD x 0.8 VDD x 0.8 to VDD x 0.2 IOL = 4.0mA IOL = - 4.0mA fXTAL = 15.0000MHz, no load Conditions 3 Multimedia ICs BU2191F *Application example 40.0000MHz CLK2 GND AVDD VDD 32.0000MHz XTAL1 CLK1 0.1F XTAL0 BCLK 15.0000MHz fref = 15.0000MHz This IC should be used mounted on a PC board. If mounted in a socket, characteristics of the IC may be adversely affected. components *Attached resonator (1) Crystal A crystal resonator with an oscillation frequency of 15,000MHz is usually sufficient. However, if f0 precision is necessary, adjust by attaching a capacitor to each end of the crystal resonator. (2) Power supply VDD bypass capacitor. *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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