Differential Clock Synthesizer/Driver For PC Motherboards

The CDC950 is a differential Clock Synthesizer driver that generates HCLK/HCLK, CLK33, 3V48, and REFCLK system Clock signals to support a computer system with next generation processors and double data rate (DDR) memory subsystems.
All output frequencies are generated from a 14.318-MHz crystal input. A reference Clock input CAN be provided at the XIN input instead of a crystal. Two phase-locked loops (PLLs) are used to generate the host frequencies and the 48-MHz Clock frequencies. On-chip loop Filters and internal feedback eliminate the need for external components.
The HCLK, CLK33 Clock and 48-MHz Clock outputs provide low-skew/low-jitter Clock signals for reliable Clock operation. All outputs have 3-state capability, which CAN be selected through control inputs SEL100/133, 3V48/SelA, and 3V48/SelB.
The outputs are either differential host Clock or 3.3-V single-ended CMOS Buffers With a Logic high-level on the PWRDWN terminal, the device operates normally. When a logical low-level input is applied, the device powers down completely with the HOST Clock at 2 IREF, HOSTB is undriven, CLK33, 3V48, and REFCLK outputs are in a low-level output state and 3V48B is in a high-level output state.
The host bus CAN operate at 100 MHz or 133 MHz. Output frequency selection is done with the corresponding setting for SEL100/133 control input. The CLK33 (PCI) frequency is fixed to 33 MHz.
Since the CDC950 is based on PLL circuitry, it requires a stabilization time to achieve phase-lock of the PLL This stabilization time is required following power up, as well as following changes to the SEL inputs. With the use of an external reference Clock this signal must be fixed-frequency and fixed-phase prior to stabilization time starts. The CDC950 is characterized for operation from 0C to 85C.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
CDC950DGGG4 Texas Instruments Differential Clock Synthesizer/Driver for PC Motherboards 48-TSSOP 0 to 85
CDC950DGG Texas Instruments Differential Clock Synthesizer/Driver for PC Motherboards 48-TSSOP 0 to 85
CDC950DGGRG4 Texas Instruments Differential Clock Synthesizer/Driver for PC Motherboards 48-TSSOP 0 to 85
CDC950DGGR Texas Instruments Differential Clock Synthesizer/Driver for PC Motherboards 48-TSSOP 0 to 85
CDC950 's PackagesCDC950 's pdf datasheet
CDC950DGG TSSOP
CDC950DGGG4 TSSOP
CDC950DGGR TSSOP
CDC950DGGRG4 TSSOP




CDC950 Pinout, Pinouts
CDC950 pinout,Pin out
This is one package pinout of CDC950,If you need more pinouts please download CDC950's pdf datasheet.

CDC950 Application circuits
CDC950 circuits
This is one application circuit of CDC950,If you need more circuits,please download CDC950's pdf datasheet.


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