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W83194BR-640 Datasheet Preview

W83194BR-640 Datasheet

166MHZ CLOCK

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W83194BR-640
166MHZ CLOCK FOR SIS CHIPSET
W83194BR-640
Data Sheet Revision History
Pages
1 n.a.
2 n.a.
3
4
5
6
7
8
9
10
Dates Version
02/Apr
1.0
Version
On Web
n.a.
1.0
Main Contents
All of the versions before 0.50 are for internal use.
Change version and version on web site to 1.0
Please note that all data and specifications are subject to change without notice. All the trademarks of
products and companies mentioned in this data sheet belong to their respective owners.
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where
malfunction of these products can reasonably be expected to result in personal injury. Winbond
customers using or selling these products for use in such applications do so at their own risk and
agree to fully indemnify Winbond for any damages resulting from such improper use or sales.
Publication Release Date: April. 2001
- 1 - Revision 1.0



Winbond
Winbond

W83194BR-640 Datasheet Preview

W83194BR-640 Datasheet

166MHZ CLOCK

No Preview Available !

W83194BR-640 pdf
W83194BR-640
1. GENERAL DESCRIPTION
The W83194BR-640 is a Clock Synthesizer for SiS 640 chipset. W83194BR-640 provides all clocks
required for high-speed RISC or CISC microprocessor such as Intel Pentium II, Pentium III and
Celeron, and also provides 16 different frequencies of CPU clocks frequency setting. All clocks are
externally selectable with smooth transitions. The W83194BR-640 makes SDRAM in synchronous or
asynchronous frequency with CPU clocks.
The W83194BR-640 provides step-less frequency programming by controlling the VCO freq. and the
programmable AGP, PCI clock output divisor ratio. A watch dog timer is quipped and when time out,
the RESET# pin will output 4ms pulse signal. Spread spectrum built in at ±0.5% or ±0.25% to reduce
EMI. Programmable stopping individual clock outputs and frequency selection through I2C interface
The W83194BR-640 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
High drive PCI 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 Intel Slot 1 and Socket 370 CPUs with I2C.
2 CPU clocks
2 AGP clocks
1 SDRAM output clock for chipset
1 IOAPIC clock
6 PCI synchronous clocks.
Optional single or mixed supply:
(Others Vdd = 3.3V, VddLCPU=2.5V)
Skew --- CPU to CPU < 175ps, CPU to SDRAM < 250ps, PCI to PCI < 500ps, AGP to AGP < 175ps
Smooth frequency switch with selections from 66 to 200mhz
I2C 2-Wire serial interface and I2C read back
0.5%, 0.25%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: April. 2001
- 2 - Revision 1.0


Part Number W83194BR-640
Description 166MHZ CLOCK
Maker Winbond
Total Page 16 Pages
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