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CDC950 데이터시트(PDF) 3 Page - Texas Instruments

부품명 CDC950
상세설명  133-MHz DIFFERENTIAL CLOCK SYNTHESIZER/DRIVER FOR PC MOTHERBOARDS/SERVERS
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CDC950 데이터시트(HTML) 3 Page - Texas Instruments

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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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