W83194R

更新时间： 2024-11-29 22:14:35

品牌	Logo	应用领域
华邦 - WINBOND		时钟
页数	文件大小	规格书
11页	159K
描述
166MHZ CLOCK FOR SIS CHIPSET

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数据手册

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W83194R 数据手册

W83194R-630A

166MHZ CLOCK FOR SIS CHIPSET

1. GENERAL DESCRIPTION

The W83194R-630A is a Clock Synthesizer for SiS 540/630 chipset. W83194R-630A provides all

clocks required for high-speed RISC or CISC microprocessor such as AMD,Cyrix,Intel Pentium,

Pentium II and also provides 16 different frequencies of CPU clocks frequency setting. All clocks are

externally selectable with smooth transitions. The W83194R-630A makes SDRAM in synchronous or

asynchronous frequency with CPU clocks.

The W83194R-630A provides I²C serial bus interface to program the registers to enable or disable

each clock outputs and W83194R-630A provides the 0.5%, 0.75% center type and 0~0.5% down type

spread spectrum to reduce EMI.

The W83194R-630A accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.

High drive PCI and SDRAM CLOCK outputs typically provide greater than 1 V /ns slew rate into 30

pF loads. CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF loads as

maintaining 50± 5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz provide

better than 0.5V /ns slew rate.

2. PRODUCT FEATURES

Supports PentiumÔ , PentiumÔ II, AMD and Cyrix CPUs with I²C.

3 CPU clocks

14 SDRAM clocks for 3 DIMMs

7 PCI synchronous clocks.

Optional single or mixed supply:

(All Vdd = 3.3V) or (Other s Vdd = 3.3V, VddLCPU=2.5V)

Skew form CPU to PCI clock 1 to 4 ns, center 2.6 ns

SDRAM frequency synchronous or asynchronous to CPU clocks

Smooth frequency switch with selections from 66 to 166mhz

I²C 2-Wire serial interface and I²C read back

0.5%, 0.75%center type, 0~0.5% down type spread spectrum to reduce EMI

Programmable registers to enable/stop each output and select modes

(mode as Tri-state or Normal )

48 MHz for USB

24 MHz for super I/O

Packaged in 48-pin SSOP

Publication Release Date: Nov. 1999

Revision 0.65

- 1 -

12 3 4 5 6 7...11

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