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ICS9159C-02CW28 Datasheet

  • ICS9159C-02CW28

  • Frequency Generator and Integrated Buffer for PENTIUMTM

  • 7頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9159C-02
Frequency Generator and Integrated Buffer for PENTIUM
TM
General Description
The
ICS9159C-02
generates all clocks required for high
speed RISC or CISC microprocessor systems such as 486,
Pentium, PowerPC,聶 etc. Four different reference frequency
multiplying factors are externally selectable with smooth
frequency transitions. These multiplying factors can be
customized for specific applications. A test mode is provided
to drive all clocks directly.
High drive BCLK outputs provide typically greater than
1V/ns slew rate into 30pF loads. PCLK outputs provide
typically better than 1V/ns slew rate into 20pF loads while
maintaining
+/鈭?%
duty cycle.
Features
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Generates up to four processor and six bus clocks, plus
disk, keyboard and reference clocks
Synchronous clocks skew matched to 250ps window on
PCLKs and 500ps window on BCLKs
Test clock mode eases system design
Custom configurations available:
Output frequency ranges to 100 MHz on options
Selectable multiplying and processor/bus ratios
Stop clock control stops clock glitch-free; available as
mask option
3.0V - 5.5V supply range
28-pin SOIC package
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Applications
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Ideal for high-speed RISC or CISC systems such as
486, Pentium, PowerPC, etc.
Block Diagram
PLL
CLOCK
GEN
DISK
KEYBD
X2
X1
XTAL OSC
REF(0:1)
OEN
FS0
FS1
PLL
CLOCK
GEN
SYNC
REG
PCLK(0:3)
BCLK(0:5)
Pentium is a trademark of Intel Corporation
PowerPC is a trademark of Motorola Corporation
9159-02 Rev D 062397
ICS reserves the right to make changes in the device data identified in this publication
without further notice. ICS advises its customers to obtain the latest version of all
device data to verify that any information being relied upon by the customer is current
and accurate.

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