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CDC9841DWR 데이터시트(PDF) 1 Page - Texas Instruments

부품명 CDC9841DWR
상세설명  PC MOTHERBOARD CLOCK SYNTHESIZER/DRIVER WITH 3-STATE OUTPUTS
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CDC9841DWR 데이터시트(HTML) 1 Page - Texas Instruments

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CDC9841
PC MOTHERBOARD CLOCK SYNTHESIZER/DRIVER
WITH 3-STATE OUTPUTS
SCAS458D – DECEMBER 1994 – REVISED APRIL 1996
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Four CPU Clock Outputs With
Programmable Frequency
(50 MHz, 60 MHz, and 66 MHz)
D Six Clock Outputs at Half-CPU Frequency
for PCI
D One 24-MHz Clock Output
D One 12-MHz Clock Output
D Two 14.318-MHz Reference Outputs
D All Output Clock Frequencies Derived From
a Single 14.31818-MHz Crystal Input
D LVTTL-Compatible Inputs and Outputs
D Internal Loop Filters for Phase-Lock Loops
Eliminate the Need for External
Components
D Operates at 3.3 VCC
D Distributed VCC and Ground Pins Reduce
Switching Noise
D Packaged in Plastic Small-Outline Package
description
The CDC9841 is a high-performance clock synthesizer/driver that generates all required clock signals
necessary for a high-performance PC motherboard. The four central processing unit (CPU) clock outputs
(PCLKn) are programmable to one of three frequencies (50 MHz, 60 MHz, or 66 MHz) via the SEL0 and SEL1
control inputs. The six peripheral-component-interconnect (PCI) clock outputs (BCLKn) are half the frequency
of PCLKn and are delayed 1 ns to 4 ns from the rising edge of the CPU clock. In addition, the four fixed-frequency
outputs provide a 24-MHz clock (CLK24), a 12-MHz clock (CLK12), and two buffered copies of the 14.318-MHz
input reference (REF0, REF1).
The CDC9841 generates all output frequencies from a 14.31818-MHz crystal input. A reference clock can be
provided at X1 instead of a crystal input.
Two phase-lock loops (PLLs) generate the CPU clock frequency and the 24-MHz clock frequency. On-chip loop
filters and internal feedback eliminate the need for external components. The PCI and 12-MHz clock
frequencies are derived from the base CPU and 24-MHz clock frequencies, respectively. The PLL circuit can
be bypassed in the TEST mode (i.e., SEL0 = SEL1 = H) to distribute a test clock provided at the X1 input.
Because the CDC9841 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 and application of a fixed-frequency, fixed-phase signal
at the X1 input, as well as following any changes to the SELn inputs.
PCLKn and BCLKn provide low-skew/low-jitter clock signals for reliable clock operation. All outputs are 3 state
and are enabled via OE.
Copyright
© 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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VCC
X1
X2
GND
OE
PCLK0
PCLK1
VCC
PCLK2
PCLK3
GND
SEL1
SEL0
VCC
REF0
REF1
VCC
CLK12
CLK24
GND
BCLK2
BCLK3
VCC
BCLK4
BCLK5
GND
BCLK1
BCLK0
DW PACKAGE
(TOP VIEW)


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