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PDF W83195BR-S Data sheet ( Hoja de datos )

Número de pieza W83195BR-S
Descripción STEPLESS 200MHZ 3-DIMM CLOCK FOR SOLANO CHIPSET
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W83195BR-S
STEPLESS 200MHZ 3-DIMM CLOCK FOR SOLANO CHIPSET
1.0 GENERAL DESCRIPTION
The W83195BR-S is a Clock Synthesizer for Intel 815 Solano chipset. W83195BR-S provides all
clocks required for high-speed RISC or CISC microprocessor and also provides 64 different
frequencies of CPU, SDRAM, PCI, 3V66, IOAPIC clocks frequency setting. All clocks are externally
selectable with smooth transitions.
The W83195BR-S provides I2C serial bus interface to program the registers to enable or disable each
clock outputs and provides 0.25% and 0.5% center type spread spectrum to reduce EMI. A watch
dog timer is quipped and when time out, the RESET# pin will output 4ms pulse signal.
The W83195BR-S provides stepless frequency programming by controlling the VCO freq. and the
clock output divisor ratio. Also the skew of CPU, SDRAM and 3V66 clock outputs are programmable.
The W83195BR-S 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.
2.0 PRODUCT FEATURES
2 CPU clocks
3 3V66 for chipset and AGP clocks
12 SDRAM clocks for 3 DIMMs
8 PCI synchronous clocks.
Optional single or mixed supply:
(VddR = VddP=VddS = Vdd48 = Vdd3 = 3.3V, VddLAPIC=VddLCPU=2.5V)
Skew form CPU to PCI clock -1 to 4 ns, center 2.6 ns
Smooth frequency switch with selections from 66.8 to 200 MHz
I2C 2-Wire serial interface and I2C read back
0.25% and 0.5% center type spread spectrum
Programmable registers to enable/stop each output and select modes
(mode as Tri-state or Normal )
Two 48 MHz pins for USB
24 MHz for super I/O
56-pin SSOP package
Publication Release Date: June 2000
- 1 - Revision 0.42

1 page




W83195BR-S pdf
W83195BR-S
011100
011101
011110
011111
SSEL5 SSEL4 SSEL3 SSEL2 SSEL1 SSEL0
100000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
110110
110111
111000
111001
111010
111011
111100
111101
111110
111111
66.60
100.00
133.30
133.30
CPU
(MHz)
136.00
138.00
139.00
141.00
142.00
142.00
143.00
143.00
144.00
144.00
146.00
146.00
147.00
147.00
148.00
148.00
149.00
152.00
153.00
156.00
157.00
158.00
159.00
160.00
162.00
164.00
170.00
175.00
180.00
185.00
190.00
200.40
100.00
100.00
133.30
100.00
SDRAM
(MHz)
102.00
138.00
104.25
105.75
142.00
106.50
143.00
107.25
144.00
108.00
146.00
109.50
147.00
110.25
148.00
111.00
111.75
152.00
114.75
156.00
117.75
158.00
119.25
160.00
121.50
123.00
127.50
116.67
120.00
185.00
126.67
133.60
66.67
66.67
66.65
66.67
3V66
(MHz)
68.00
69.00
69.50
70.50
71.00
71.00
71.50
71.50
72.00
72.00
73.00
73.00
73.50
73.50
74.00
74.00
74.50
76.00
76.50
78.00
78.50
79.00
79.50
80.00
81.00
82.00
85.00
77.78
80.00
61.67
63.33
66.80
PRELIMINARY
33.33
33.33
33.33
33.33
16.67
16.67
16.66
16.67
PCI(MHz)
IOAPIC
(MHz)
34.00
34.50
34.75
35.25
35.50
35.50
35.75
35.75
36.00
36.00
36.50
36.50
36.75
36.75
37.00
37.00
37.25
38.00
38.25
39.00
39.25
39.50
39.75
40.00
40.50
41.00
42.50
38.89
40.00
30.83
31.67
33.40
17.00
17.25
17.38
17.63
17.75
17.75
17.88
17.88
18.00
18.00
18.25
18.25
18.38
18.38
18.50
18.50
18.63
19.00
19.13
19.50
19.63
19.75
19.88
20.00
20.25
20.50
21.25
19.44
20.00
15.42
15.83
16.70
Publication Release Date: June 2000
- 5 - Revision 0.42

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