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CDC950 데이터시트(PDF) 3 Page - Texas Instruments |
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CDC950 데이터시트(HTML) 3 Page - Texas Instruments |
3 / 16 page CDC950 133MHz DIFFERENTIAL CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS/SERVERS SCAS646B − FEBRUARY 2001 − REVISED OCTOBER 2003 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION 3V48/SelA, 3V48/SelB 3, 4 I/O 48-MHz 180 ° shifted pair clocks for USB use Logic select pins. Selects the mode of operation, see Table 1 for details. AGND 27, 45 P Analog ground AVDD3.3V 25, 46 P Power. Analog power supply CLK33 1 O 33-MHz reference clock for PCI use, host clock divided by 3 or by 4 GND 5, 9, 15, 21, 28, 34, 40, 47 P Ground HCLK 7, 10, 13, 16, 33, 36, 39, 42 O CPU and host clock outputs [7:0]. These eight differential CPU clock pairs run at 100/133 MHz. The VOH swing amplitude is configured by MultSel0, MultSel1 pins. See Table 5 and Intel’s CK00 document for details. HCLK 8, 11, 14, 17, 32, 35, 38, 41 O CPU and host clock outputs [7:0]. These eight differential CPU clock pairs run at 100/133 MHz. The VOH swing amplitude is configured by MultSel0, MultSel1 pins. See Table 5 and Intel’s CK00 document for details. I_REF 26 I Current reference. This pin establishes the reference current for host clock parts. See Table 5 and Intel’s CK00 document for details. MultSel0 30 I See Table 5 and Intel’s CK00 document for details. MultSel1 29 I See Table 5 and Intel’s CK00 document for details. PWRDWN 44 I Power-down input. 3.3-V LVTTL compatible, asynchronous input that requests the device to enter the power-down mode. See Table 2 for details. REFCLK 19 O 14.138-MHz reference clock output: 3.3 V copy of the 14.318-MHz reference clock. SEL100/133 48 I Active low LVTTL level logic select. SEL100/133 is used for enabling 100/133 MHz. Low = 100 MHz, high = 133 MHz SPREAD 20 U Spread spectrum enable. 3.3-V LVTTL compatible, input that enables the spread spectrum mode when held low. See Table 4 for details. VDD3.3V 2, 6, 12, 18, 24, 31, 37, 43 P Power. Power supply XIN 22 I Crystal connection or an external reference frequency input. Connect to either a 14.138-MHz crystal or an external reference signal. XOUT 23 O Crystal connection. An output connection for an external 14.318-MHz crystal. If using an external reference, this pin must be left unconnected. |
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