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The W83195AR-25 is a Clock Synthesizer for Intel 815 Solano chipset. W83195AR-25 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 W83195AR-25 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.
The W83195AR-25 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.
W83195AR-25 Maximum Ratings
Symbol
PARAMETER
RATING
Vdd , VIN
Voltage on any pin with respect to GND
-0.5V to +7.0V
TSTG
Storage Temperature
-65° C to +150° C
TB
Ambient Temperature
-55° C to +125° C
TA
Operating Temperature
0°C to + 70°C
W83195AR-25 Features
· 2 CPU clocks (2.5V) · 3 3V-66 clocks (3.3V) · 12 SDRAM clocks for 3 DIMMs(3.3V) · 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 200MHz · I2C 2-Wire serial interface and I2C read back · 0.25% center and 0.5% center 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 56-pin SSOP