參數(shù)資料
型號(hào)： W83195R-08
廠商： WINBOND ELECTRONICS CORP
元件分類： XO, clock
英文描述： 150MHZ 4-DIMM Clock(頻率為150MHZ、3-DIMM 時(shí)鐘)
中文描述： 150 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝： SSOP-56
文件頁(yè)數(shù)： 1/18頁(yè)
文件大?。?/td> 230K
代理商： W83195R-08
W83195R-08
150MHZ 4-DIMM CLOCK
Publication Release Date: Mar. 1999
Revision 0.30
- 1 -
1.0 GENERAL DESCRIPTION
The W83195R-08 is a Clock Synthesizer which provides all clocks required for high-speed RISC or
CISC microprocessor such as Intel Pentium II. W83195R-08 provides sixteen CPU/PCI frequencies
which are externally selectable with smooth transitions. W83195R-08 also provides 17 SDRAM clocks
controlled by the none-delay buffer_in pin.
The W83195R-08 accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
Spread spectrum built in at
ó
0.5% or
ó
0.25% to reduce EMI. Programmable stopping individual
clock outputs and frequency selection through I
2
C interface. The device meets the Pentium power-up
stabilization, which requires CPU and PCI clocks be stable within 2 ms after power-up. Using dual
function pin for the slots(ISA, PCI, CPU, DIMM) is not recommend. The add on cards may have a
pull up or pull down.
High drive seven PCI and SDRAM CLOCK outputs typically provide greater than 1 V /ns slew rate
into 30 pF loads. Two CPU CLOCK outputs typically provide better than 1 V /ns slew rate into 20 pF
loads, when maintaining 50
ó
5% duty cycle. The fixed frequency outputs, such as REF, 24MHz and
48 MHz provide better than 0.5V /ns slew rate.
2.0 PRODUCT FEATURES
Supports Pentium
II CPU with I
2
C.
3 CPU clocks (one free-running CPU clock)
17 SDRAM clocks for 4 DIMs
7 PCI synchronous clocks
Two IOAPIC clocks for multiprocessor support
Optional single or mixed supply:
(Vddq1=Vddq2 = Vddq3 = Vddq4 = VddL1 =VddL2= 3.3V) or (Vddq1= Vddq2 = Vddq3=Vddq4 =
3.3V, VddL1 = VdqL2 = 2.5V)
< 250ps skew among CPU and SDRAM clocks
< 250ps skew among PCI clocks
< 5ns propagation delay SDRAM from buffer input
Skew from CPU(earlier) to PCI clock -1 to 4ns, center 2.6ns.
Smooth frequency switch with selections from 50 MHz to 133 MHz CPU
I
2
C 2-Wire serial interface and I
2
C read back
ó
0.25% or
ó
0.5% center type spread spectrum function to reduce EMI
Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
MODE pin for power Management
One 48 MHz for USB & one 24 MHz for super I/O
56-pin SSOP package
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