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PDF W83195R-08 Data sheet ( Hoja de datos )
| Número de pieza | W83195R-08 | |
| Descripción | 150MHZ 4-DIMM CLOCK | |
| Fabricantes | Winbond | |
| Logotipo |  |
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W83195R-08
150MHZ 4-DIMM CLOCK
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 ¡Ó0.5% or ¡Ó0.25% 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. 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 I2C.
• 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
• I2C 2-Wire serial interface and I2C read back
• ¡Ó0.25% or ¡Ó0.5% 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
Publication Release Date: Mar. 1999
- 1 - Revision 0.30
1 page  
W83195R-08
6.0 FREQUENCY SELECTION
FS3=0
CPU,SDRAM (MHz)
FS2 FS1
00
00
01
01
10
10
11
11
FS3=1
FS2 FS1
00
00
01
01
10
10
11
11
FS0
0
1
0
1
0
1
0
1
FS0
0
1
0
1
0
1
0
1
124
75
83.3
66.8
103
112
133
100.3
CPU,SDRAM (MHz)
120
115
110
105
140
150
124
133
PCI (MHz)
41.33(CPU/3)
37.5(CPU/2)
41.65(CPU/2)
33.4(CPU/2)
34.3(CPU/3)
37.33(CPU/3)
44.33(CPU/3)
33.3(CPU/3)
PCI (MHz)
40.00(CPU/3)
38.33(CPU/3)
36.67(CPU/3)
35.00(CPU/3)
35.00(CPU/4)
37.50(CPU/4)
31.00(CPU/4)
33.25(CPU/4)
PRELIMINARY
REF,IOAPIC
(MHz)
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
REF,IOAPIC
(MHz)
14.318
14.318
14.318
14.318
14.318
14.318
14.318
14.318
7.0 MODE PIN -POWER MANAGEMENT INPUT CONTROL
MODE, Pin8 (Latched Input)
0
1
PIN 3
PCI_STOP# (Input)
REF0 (Output)
Publication Release Date: Mar. 1999
- 5 - Revision 0.30
5 Page 
W83195R-08
9.3 DC CHARACTERISTICS
PRELIMINARY
Vddq4 = Vddq3 = Vddq2 = Vddq1=3.3V ± 5 %, VddL1=VddL2 = 2.375V~2.9V , TA = 0°C to +70°C
Parameter
Symbol Min Typ Max Units
Test Conditions
Input Low Voltage
VIL
0.8 Vdc
Input High Voltage
VIH 2.0
Vdc
Input Low Current
IIL
-66 µA
Input High Current
IIH
5 µA
Output Low Voltage
IOL = 4 mA
VOL
0.4 Vdc All outputs
Output High Voltage
IOH = 4mA
VOH 2.4
Vdc All outputs using 3.3V power
Tri-State leakage Current
Ioz
10 µA
Dynamic Supply Current
for Vdd + Vddq3
Idd3
mA CPU = 66.6 MHz
PCI = 33.3 Mhz with load
Dynamic Supply Current
for Vddq2 + Vddq2b
Idd2
mA Same as above
CPU Stop Current
for Vdd + Vddq3
ICPUS3
mA Same as above
CPU Stop Current
for Vddq2 + Vddq2b
ICPUS2
mA Same as above
PCI Stop Current
for Vdd + Vddq3
IPD3
mA
- 11 -
Publication Release Date: Mar. 1999
Revision 0.30
11 Page | ||
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| PDF Descargar | [ Datasheet W83195R-08.PDF ] | |
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