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CDC922 Datasheet(PDF) 2 Page - Texas Instruments |
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CDC922 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 18 page CDC922 133-MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS WITH 3-STATE OUTPUTS SCAS634 –JULY 28, 1999 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The CPU bus can operate at 100 MHz or 133 MHz. Output frequency selection is done with corresponding setting for SEL133/100 control input. The PCI bus frequency is fixed to 33 MHz. Since the CDC922 is based on PLL circuitry, it requires a stabilization time to achieve phase lock of the PLL. This stabilization time is required after power up or after changes to the SEL inputs are made. With use of an external reference clock, this signal must be fixed-frequency and fixed-phase before the stabilization time starts. Function Tables SELECT FUNCTIONS INPUTS OUTPUTS SEL133/ 100 SEL1 SEL0 CPU CPU_DIV2 3V66 PCI 48MHz REF APIC FUNCTION L L L Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z 3-state L L H N/A N/A N/A N/A N/A N/A N/A Reserved L H L 100 MHz 50 MHz 66 MHz 33 MHz Hi-Z 14.318 MHz 16.67 MHz 48-MHz PLL off L H H 100 MHz 50 MHz 66 MHz 33 MHz 48 MHz 14.318 MHz 16.67 MHz 48-MHz PLL on H L L TCLK/2 TCLK/4 TCLK/4 TCLK/8 TCLK/2 TCLK TCLK/16 Test H L H N/A N/A N/A N/A N/A N/A N/A Reserved H H L 133 MHz 66 MHz 66 MHz 33 MHz Hi-Z 14.318 MHz 16.67 MHz 48-MHz PLL off H H H 133 MHz 66 MHz 66 MHz 33 MHz 48 MHz 14.318 MHz 16.67 MHz 48-MHz PLL on ENABLE FUNCTIONS INPUTS OUTPUTS INTERNAL PWR_DWN CPU CPU_DIV2 APIC 3V66 PCI REF, 48MHz CRYSTAL VCOs L L L L L L L Off Off H On On On On On On On On OUTPUT BUFFER SPECIFICATIONS BUFFER NAME VDD RANGE (V) IMPEDANCE ( Ω) BUFFER TYPE CPU, CPU_DIV2, APIC 2.375 – 2.625 13.5 – 45 TYPE 1 48MHz, REF 3.135 – 3.465 20 – 60 TYPE 3 PCI, 3V66 3.135 – 3.465 12 – 55 TYPE 5 |
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