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參數(shù)資料
| 型號(hào)： | ICS9159M-20 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 66.6 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| 封裝： | 0.300 INCH, SOIC-28 |
| 文件頁(yè)數(shù)： | 1/5頁(yè) |
| 文件大小： | 150K |
| 代理商： | ICS9159M-20 |
Integrated
Circuit
Systems, Inc.
General Description
Features
ICS9159-20
Frequency Generator for SIS551X and SIS6205 Chip Set Systems
ICS9159-20RevB040597P
Block Diagram
The ICS9159-20 is a low-cost frequency generator designed
specifically for SIS551X chip set and SIS6205 VGA control-
ler. The integrated buffer minimizes skew. A 14.31818 MHz
XTAL oscillator provides the reference clock to generate
standard Pentium frequencies. The CPU clock makes grad-
ual frequency transitions without violating the PLL timing
of internal microprocessor clock multipliers.
Both synchronous and asynchronous bus designs are sup-
ported. For chip sets that require an early CPU clock, the
buffers are driven by the CPU clock. In this configuration, the
CPU clock becomes the early clock and the output of the
uncommitted buffers become the bus synchronized bus clocks.
One selectable CPU clocks operate up to 66.66 MHz
5 uncommitted buffers
Maximum CPU jitter of ±200ps
7 BUS clocks support sync or async bus operation
500ps skew window for all synchronous clock edges
Integrated buffer outputs drive up to 30pF loads
3.1V - 3.5V supply range
28-pin 300-mil SOIC package
Supports chip sets requiring early CPU clocking
Pentium is a trademark of Intel Corporation.
Functionality
All frequencies in MHz, assuming 14.318 MHz input.
Applications
Ideal for green Pentium and P6 PCI systems based on the
SIS5596 chip set
Pin Configuration
28-Pin SOIC
3.3V±10%, 0-70°C
Crystal (X1, X2) = 14.318181 MHz
FS1
FS0
REF
(MHz)
CPU
(MHz)
BCLK (MHz)
BSEL=1 BSEL=0
0
Tistate
Tristate
0
1
14.318
50
25
33.33
1
0
14.318
60
30
33.33
1
14.318
66.66
33.33
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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| ICS9161A | 制造商:ICS 制造商全稱:ICS 功能描述:Dual Programmable Graphics Frequency Generator |
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