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CDC924 Fiches technique(PDF) 2 Page - Texas Instruments |
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CDC924 Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 21 page CDC924 133MHz CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS WITH 3STATE OUTPUTS SCAS607B − NOVEMBER 1998 − REVISED JULY 2005 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) Since the CDC924 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, PCI_F 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 CPU_STOP PWR_DWN PCI_STOP CPU CPU_DIV2 APIC 3V66 PCI PCI_F REF, 48MHz Crystal VCOs X L X L L L L L L L Off Off L HL L On On L L On On On On L HH L On On L On On On On On H HL On On On On L On On On On H H H On 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, PCI_F, 3V66 3.135 − 3.465 12 − 55 TYPE 5 |
Numéro de pièce similaire - CDC924 |
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Description similaire - CDC924 |
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