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CDC950DGGR Datasheet(PDF) 4 Page - Texas Instruments |
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CDC950DGGR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 16 page CDC950 133MHz DIFFERENTIAL CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS/SERVERS SCAS646B − FEBRUARY 2001 − REVISED OCTOBER 2003 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Function Tables Table 1. Select Functions INPUTS OUTPUTS FUNCTION SEL100/133 SelA SelB HCLK, HCLK CLK33 3V48, 3V48 REFCLK FUNCTION 0 0 0 100 MHz 33 MHz 48 MHz 14.318 MHz Active 100 MHz 0 0 1 100 MHz 33 MHz L, H 14.318 MHz 100 MHz mode; PLL48 powerdown 0 1 0 105 MHz 35 MHz 48 MHz 14.318 MHz 100 MHz mode 5% overclocking 0 1 1 Hi-Z Hi-Z Hi-Z Hi-Z All 3-state outputs 1 0 0 133 MHz 33 MHz 48 MHz 14.318 MHz Active 133 MHz 1 0 1 127 MHz 31.7 MHz 48 MHz 14.318 MHz 133 MHz mode −5% underclocking 1 1 0 133 MHz 33 MHz 48 MHz 14.318 MHz Test mode 1 1 1 TCLK/2 TCLK/8 TCLK/2 TCLK Test mode (PLL bypass) Table 2. Enable Functions INPUT OUTPUTS PWRDWN HCLK HCLK CLK33 3V48 3V48 REFCLK 0 2 × IREF Hi-Z L L H L 1 On On On On On On Table 3. Output Buffer Specifications BUFFER NAME VDD RANGE (V) IMPEDANCE ( Ω) BUFFER TYPE 3V48, REFCLK 3.135 − 3.465 20−60 TYPE 3 CLK33 3.135 − 3.465 12−55 TYPE 5 HCLK/HCLK 3.135 − 3.465 TYPE X1 Table 4. Spread Spectrum Functions INPUT OUTPUTS SPREAD OUTPUTS 0 Spread spectrum clocking active, −0.6% at HCLK/HCLK, CLK33 1 Spread spectrum clocking inactive |
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