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CDC960DL Datasheet(PDF) 5 Page - Texas Instruments

Part # CDC960DL
Description  200-MHz CLOCK SYNTHESIZER/DRIVER WITH SPREAD SPECTURM CAPABILITY AND DEVICE CONTROL INTERFACE
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CDC960DL Datasheet(HTML) 5 Page - Texas Instruments

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CDC960
200MHz CLOCK SYNTHESIZER/DRIVER
WITH SPREAD SPECTRUM CAPABILITY AND DEVICE CONTROL INTERFACE
SCAS675 – APRIL 2002
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
CPU[0:1],CPU[0:1]
41, 37
40, 36
O
3.3-V, differential CPU clock outputs
CPU Clock Outputs 0 and 1: CPU push-pull true clock outputs of the differential pair
CPU Clock Outputs 0 and 1: CPU push-pull complementary clock outputs of the differential pair
FS[0:2] & REF[0:2]
1, 48, 45
I/O
3.3 V, 14.318-MHz clock outputs
Frequency Select inputs: Power–on strapping to set device operating frequency as described in
the Device Frequency Select Functions table. These inputs have 150-k
Ω internal pullup resistors.
Low = 0, High = 1. 3.3-V reference clock outputs: Fixed clock output at 14.318 MHz
GND
5, 10, 15,
20, 27, 30,
34, 39, 47
G
Power Connection: Connected to VSS. Used to ground digital portions of the chip
GNDA
42
G
Analog GND: Connected to VSS through filter. Used to ground the main CPU-PLL on the chip
GNDF
33
G
Analog GND for 48-MHz PLL: Connected to VSS through filter. Used to ground the 48-MHz PLL on
the chip
LDT_Stop
12
I
Control for 66-MHz PCI clocks: Active LOW control input to halt all 66-MHz PCI clocks except the
free-running clock. This input has a 150-k
Ω internal pullup resistor. Once this input has been
asserted, PCI/LDT outputs if operating at 66-MHz must stop in the low state within 1
µs.
Low = stop, High = running
PCI[0:5]
13, 14, 17,
18, 21, 22
O
3.3-V PCI clock outputs divided down from CPU-PLL
3.3-V PCI clock outputs: PCI clocks operate at 33 MHz.
PCI_F
23
O
3.3-V, 33-MHz clocks divided down from CPU-PLL
3.3-V Free-Running PCI clock output: The free-running PCI clock pin operates at 33 MHz. The
free-running PCI clock is not turned off when PCI_Stop# is activated LOW.
PCI/LDT[0:2]
7, 8, 11
O
3.3-V PCI 33-MHz or LDT 66-MHz outputs: This group of outputs is selectable between 33 MHz
and 66 MHz based upon the state of PCI/LDT_SEL. When running at 66 MHz these outputs are for
use as reference clocks to LDT devices.
PCI/LDT_SEL
6
I
PCI 33-MHz/LDT 66-MHz Select: This input selects the output frequency of PCI/LDT outputs to
either 33 MHz or 66 MHz. This is a dedicated input pin to avoid corruption of the input state due to
PCI add-in cards that may have termination resistors on the input clocks. This input has a 150-k
internal pullup resistor. Low = 66-MHz outputs, High = 33-MHz outputs
PCI_Stop
24
I
3.3-V LVTTL-compatible input for PCI_Stop active low
Control for 33-MHz PCI clocks: Active LOW control input to halt all 33-MHz PCI clocks except the
free-running clock. This input has a 150-k
Ω internal pullup resistor. Once this input has been
asserted, the PCI outputs and PCI/LDT outputs operating at 33 MHz must stop in the low state
within 1
µs.
Low = stop, High = running
SCLK
25
I
SMBus compatible SCLK.
Clock pin for SMBus circuitry (SMBus revision 1.1). This input has an internal pull-up resistor of
150 k
Ω. SCLK is a 3.6-V tolerant signal input. High impedance at power down is not supported.
SDATA
26
I/O
SMBus compatible SDATA
Data pin for SMBus circuitry (SMBus revision 1.1). This output is open drain and has an internal
pullup resistor of 150 k
Ω. SDATA is a 3.6V tolerant signal IO. High impedance at power down is not
supported.
SPREAD
44
I
Spread Spectrum Clocking Enable: Power-on strapping to set spread spectrum clocking as
enabled or disabled. This input allows the default spread spectrum clocking mode to be enabled or
disabled upon power up. This input has a 150-k
Ω internal pullup resistor.
Low = disable, High = enable. Note that all Athlon and Hammer systems are recommended to use
SSC; therefore, the default of this pin is enabled and should only be turned off for debug and test
purposes.
USB
31
O
3.3-V, fixed 48-MHz non-SSC clock output
3.3-V USB clock output: Fixed clock output at 48 MHz
VDD
2, 9, 16,
19, 29, 35,
38, 46
P
Power Connection: Connected to 3.3-V power supply. Used to supply digital portions of the chip


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