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Número de pieza | W83194AR-73 | |
Descripción | 150MHZ CLOCK FOR WHITNEY CHIPSET | |
Fabricantes | Winbond | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de W83194AR-73 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
No Preview Available ! W83194AR-73
150MHZ CLOCK FOR WHITNEY CHIPSET
1.0 GENERAL DESCRIPTION
The W83194AR-73 is a Clock Synthesizer for Intel Whitney chipset. W83194AR-73 provides all
clocks required for high-speed RISC or CISC microprocessor and also provides 32 different
frequencies of CPU, SDRAM, PCI, 3V66, IOAPIC clocks frequency setting. All clocks are externally
selectable with smooth transitions.
The W83194AR-73 provides I2C serial bus interface to program the registers to enable or disable
each clock outputs and provides 0.25% center and 0-0.5% down type spread spectrum to reduce EMI.
The W83194AR-73 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¡Ó 5% duty cycle. The fixed frequency outputs as REF, 24MHz, and 48 MHz provide
better than 0.5V /ns slew rate.
1.0 PRODUCT FEATURES
• 2 CPU clocks
• 9 SDRAM clocks for 2 DIMMs
• 8 PCI synchronous clocks.
• Optional single or mixed supply:
(VDDR = VDDP=VDDS = VDD48 = VDD3 = 3.3V, VDDA=VDDC=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 150MHz
• I2C 2-Wire serial interface and I2C read back
• 0.25% center and 0-0.5% down type spread spectrum
• 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: May 1999
- 1 - Revision 0.40
1 page W83194AR-73
5.4 Register 3: PCI Clock Register (1 = Active, 0 = Inactive)
Bit @PowerUp Pin
Description
7 1 20 PCICLK7 (Active / Inactive)
6 1 19 PCICLK6 (Active / Inactive)
5 1 17 PCICLK5 (Active / Inactive)
4 1 16 PCICLK4 (Active / Inactive)
3 1 15 PCICLK3 (Active / Inactive)
2 1 13 PCICLK2 (Active / Inactive)
1 1 12 PCICLK1 (Active / Inactive)
0 1 11 PCICLK0 (Active / Inactive)
5.5 Register 4: Additional Register (1 = Active, 0 = Inactive)
Bit @PowerUp Pin
Description
7 X - SEL_3V66#
6 1 8 3V66_1(Active / Inactive)
5 1 7 3V66_0(Active / Inactive)
4 0 - Reserve
3 1 47 IOAPIC (Active / Inactive)
2 X - FS1#
1 1 44 CPUCLK1(Active / Inactive)
0 1 45 CPUCLK0(Active / Inactive)
5.6 Register 5: Reserve Register
Bit @PowerUp Pin
7 0 - Reserve
6 0 - Reserve
5 0 - Reserve
4 0 - Reserve
3 0 - Reserve
2 0 - Reserve
1 0 - Reserve
0 0 - Reserve
Description
PRELIMINARY
Publication Release Date: May 1999
- 5 - Revision 0.30
5 Page |
Páginas | Total 10 Páginas | |
PDF Descargar | [ Datasheet W83194AR-73.PDF ] |
Número de pieza | Descripción | Fabricantes |
W83194AR-73 | 150MHZ CLOCK FOR WHITNEY CHIPSET | Winbond |
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