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 •1)Features Clock signals of two different types can be generated 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 XTAL OSC 14.3181MHz CLK1 1/2 PLL1 33.8680MHz DATA1 CLK2 1/4 DATA2 PLL2 24.5795MHz VREF 1 Multimedia ICs BU2192F •Pin descriptions Pin No. Pin name 1 CLK2 Clock output 2 (f2 = 24.5795MHz) A 2 GND GND — 3 XTAL I Reference oscillation input B 4 N.C. 5 CLK1 Function Circuit — — Clock output 1 (f1 = 33.8680MHz) A 6 N.C. 7 DVDD Digital power supply — 8 AVDD Analog power supply — — — •Input / output circuits Type A Type B Pin Pin From inside To inside 1•5 3 •Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Input voltage Storage temperature Power dissipation Symbol Limits Unit VDD – 0.5 ~ + 7.0 V VIN – 0.5 ~ VDD + 0.5 V Tstg – 30 ~ + 125 °C Pd 450∗ mW 䊊 Do not represent guaranteed performance. ∗ Reduced by 4.5mW for each increase in Ta of 1°C over 25°C. 䊊 Not designed for radiation resistance. •Recommended operating conditions (Ta = 25°C) Parameter Symbol Power supply voltage VDD Input high level voltage VIH Input low level voltage VIL Operating temperature Topr Output load 2 CL Limits Unit – 4.5 ~ + 5.5 V 0.8 × VDD ~ VDD V 0.0 ~ 0.2 × VDD V – 5 ~ + 70 °C 15 (Max.) pF Multimedia ICs BU2192F otherwise noted, Ta = 0 to 70°C, V •Electrical characteristics (unless XTALI [f ] = 14.3181MHz) DD (AVDD) = 4.5V to 5.5V, CL ⬉ 15pF, REF Parameter Input Vth XTALI Symbol Min. Typ. Max. Unit Conditions Vth 0.8 — 2.2 V — Output low level voltage VOL — — 0.4 V lOL = 4.0mA Output high level voltage VOH VDD – 0.5 — — V lOL = – 4.0mA Operating circuit current IDD — 30 50 mA Output frequency 1 f1 – 100ppm 33.8680 + 100ppm MHz fREF × 123 / 26 / 2 Output frequency 2 f2 – 100ppm 24.5795 + 100ppm MHz fREF × 103 / 15 / 4 Rise time tR — — 5 nsec VDD × 0.2 to VDD × 0.8 Fall time tF — — 5 nsec VDD × 0.8 to VDD × 0.2 Jitter J1s — 80 250 psec 1sigma Jitter Jabs — 300 1 nsec MIN-MAX width tPT — — 10 msec ∗ Duty 45 50 55 % Power up time Duty fREF = 14.3181MHz, no load 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 0.1µF 2 GND DVDD 7 3 XTALI N.C. 6 4 N.C. CLK1 5 fREF = 14.3181MHz 33.8680MHz 3 Multimedia ICs BU2192F •External dimensions (Units: mm) 1 4 0.11 1.27 0.15 ± 0.1 4.4 ± 0.2 5 1.5 ± 0.1 6.2 ± 0.3 5.0 ± 0.2 8 0.4 ± 0.1 0.3Min. 0.15 SOP8 4