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参数资料
| 型号： | MK1492-04RTRLF |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 75 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| 封装： | 0.150 INCH, SSOP-28 |
| 文件页数： | 1/8页 |
| 文件大小： | 102K |
| 代理商： | MK1492-04RTRLF |
MK1492-04
OPTi Firestar+ Clock Source
MDS1492-04C
1
Revision 4308
Printed 4/30/98
MicroClock Division of ICS1271 Parkmoor Ave.San JoseCA95126(408)295-9800tel(408)295-9818fax
PRELIMINARY INFORMATION
ICRO
CLOCK
Block Diagram
Description
Features
The MK1492-04 is a low cost, low jitter, high
performance clock synthesizer for OPTi
Firestar+ chipsets for Pentium and Pentium II
Processor based computer applications. Using
patented analog Phase-Locked Loop (PLL)
techniques, the device accepts a 14.318 MHz
crystal input to produce multiple output clocks
up to 75 MHz. It provides selectable Host and
Host/2 PCI local bus clocks and a selectable
24/48 MHz clock for Super I/O or Universal
Serial Bus (USB). The device has up to eight
Host output clocks, and includes a serial port for
controlling the output clocks.
The chip has three different power down modes
to reduce power consumption.
I2C Serial Port supports Output Disable, CPU
Frequency select, and Low EMI control
Packaged in 28 pin, 150 mil wide SSOP
Provides all critical timing for OPTi Firestar+
Separate VDDs on HOST1:4 and automatic current
adjust for Host 1,2 provide strong clock drive as
required by Tillamook 2.5V processors
48MHz USB and 24MHz SIO support
Single pin CPU(Host) slowdown to 33.3MHz option
Multiple power down modes
Low EMI Enable pin reduces EMI radiation on
HOST and PCI clocks (patented)
Selectable PCIF on up to 3 outputs
Crystal
Oscillator
VDD
GND
HOST/PCI
Clocks
CPU Frequency Select
PCISTP#
14.31818 MHz
crystal
Output
Buffers
Output
Buffer
48 MHz
Clock
Output
Buffers
XI
XO
CPUS#
14.3M/48M Select
Host/2
14.318 MHz or
24.000 MHz or
PCI
HOST 5:8
PCI 1:4
Low EMI Enable
OE (all outputs)
Output
Buffer
14.318 MHz
14.318 MHz or
48 MHz
Output
Buffer
CPU Slow/Stop Select
PCI Free Run Enable
2
4
EHOST1
SDATA
SDCLK
14.3M/24M/PCI Select
MUX
Output
Buffers
VDDHOST1, 2
HOST3, 4
Output
Buffers
2
VDDHOST3, 4
DS
I2C
Control
HOST2
24 MHz
Clock
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相关代理商/技术参数 |
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| MK1493-01 | 制造商:ICS 制造商全称:ICS 功能描述:PCI Clock Generator |
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