W83194R-KX PDF даташит
Спецификация W83194R-KX изготовлена «Winbond» и имеет функцию, называемую «133MHZ 3-DIMM K7 CLOCK». |
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Детали детали
Номер произв | W83194R-KX |
Описание | 133MHZ 3-DIMM K7 CLOCK |
Производители | Winbond |
логотип |
13 Pages
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W83194R-KX
133MHZ 3-DIMM K7 CLOCK
1.0 GENERAL DESCRIPTION
The W83194R-KX is a clock generator which provides all clocks required for AMD K7 system.
W83194R-KX provides one differential pair CPU clock open drain outputs up to 143MHz which are
externally selectable with smooth transitions. W83194R-KX also provides 6 PCI clocks and 13
SDRAM clocks controlled by the none-delay buffer_in pin.
The W83194R-KX accepts a 14.318 MHz reference crystal as its input and runs on a 3.3V supply.
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 device meets the Pentium power-up
stabilization, which requires CPU and PCI clocks be stable within 2 ms after power-up.
High drive six PCI and thirteen 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± 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 AMD K7 CPU with I2C.
• One pair of differential CPU clocks
• One chipset clock
• 13 SDRAM clocks for 3 DIMMs
• 6 PCI synchronous clocks
• Optional single or mixed supply:
(Vddq3=Vddq2 =3.3V) or (Vddq3 = 3.3V, Vddq2 = 2.5V)
• < 250ps skew among CPU clocks
• < 250ps skew among PCI clocks
• < 5ns propagation delay SDRAM from buffer input
• Skew from CPU(earlier) to PCI clock 1.5 to 4ns, center 2.6ns.
• Smooth frequency switch with selections from 66.8 MHz to 143 MHz CPU
• I2C 2-Wire serial interface and I2C read back
• ± 0.25% or ± 0.5% spread spectrum function to reduce EMI
• Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
• One 48 MHz for USB & one 24 MHz for super I/O
• 48-pin SSOP package
Publication Release Date: Nov. 1999
- 1 - Revision 0.35
No Preview Available ! |
W83194R-KX
PRELIMINARY
3.0 BLOCK DIAGRAM
Xin
Xout
PD#
FS(0:3)* 4
MODE*
SDATA*
SDCLK*
BUFFER IN
PLL2
~~
XTAL
OSC
1/2
PLL1
Spread
Spectrum
LATCH
~
POR
4
Config.
Reg.
STOP
PCI
Clock
Divider
48MHz
24_48MHz
REF0/CPU_STOP#
REF1
CPUT_CS
CPUT0
CPUC0
PCICLK(0:5)
6
SDRAM(0:12)
13
4.0 PIN CONFIGURATION
Publication Release Date: Nov. 1999
- 2 - Revision 0.35
No Preview Available ! |
Vddq3
CPU_STOP#/REF0
Vss
Xin
Xout
Vddq3
PCICLK0/MODE*
PCICLK1/FS1*
Vss
PCICLK2
PCICLK3
PCICLK4
PCICLK5
Vddq3
BUFFER IN
Vss
SDRAM11
SDRAM10
Vddq3
SDRAM 9
SDRAM 8
Vss
SDATA*
SDCLK*
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
W83194R-KX
PRELIMINARY
48 REF1/FS0*
47 Vss
46 CPUT_CS
45 Vss
44 CPUC0
43 CPUT0
42 VddQ2
41 PD#
40 SDRAM12
39 Vss
38 SDRAM 0
37 SDRAM 1
36 Vddq3
35 SDRAM 2
34 SDRAM 3
33 Vss
32 SDRAM 4
31 SDRAM 5
30 Vddq3
29 SDRAM 6
28 SDRAM 7
27 Vddq3
26 48MHz/FS2*
25 24_48MHz/FS3*
5.0 PIN DESCRIPTION
IN - Input
OUT - Output
I/O - Bi-directional Pin
# - Active Low
* - Internal 250kΩ pull-up
5.1 Crystal I/O
SYMBOL
Xin
Xout
PIN I/O
FUNCTION
4 IN Crystal input with internal loading capacitors and
feedback resistors.
5 OUT Crystal output at 14.318MHz nominally.
5.2 CPU, SDRAM, PCI, IOAPIC Clock Outputs
SYMBOL
CPUT_CS
CPU_C0
CPU_T0
PIN I/O
FUNCTION
46 OD CPU_C0 and CPU_T0 are the differential open drain
44 CPU clocks for K7. CPUT_CS is the open drain pin
43 for the chipset. It has the same phase relationship as
CPU_T0.
Publication Release Date: Nov. 1999
- 3 - Revision 0.35
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Номер в каталоге | Описание | Производители |
W83194R-KX | 133MHZ 3-DIMM K7 CLOCK | Winbond |
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