W83194R-67A中文資料華邦電子數(shù)據(jù)手冊(cè)PDF規(guī)格書(shū)

GENERAL DESCRIPTION

The W83194R-67A is a Clock Synthesizer which provides all clocks required for high-speed RISC or CISC microprocessor such as Intel Pentium , AMD and Cyrix. W83194R-67A provides sixteen CPU/PCI frequencies which are externally selectable with smooth transitions. W83194R-67AA also provides 13 SDRAM clocks controlled by the none-delay buffer_in pin.

PRODUCT FEATURES

? Supports Pentium? , AMD, Cyrix CPU with I2C.

? 4 CPU clocks (one free-running CPU clock)

? 13 SDRAM clocks for 3 DIMs

? 6 PCI synchronous clocks

? 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

? < 4ns 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 60 MHz to 124 MHz CPU

? I2C 2-Wire serial interface and I2C read back

? ?ó0.25 or ?ó0.5 spread spectrum function to reduce EMI

? Programmable registers to enable/stop each output and select modes (mode as Tri-state or Normal )

? 2ms power up clock stable time

? MODE pin for power Management

? One 48 MHz for USB & one 24 MHz for super I/O

? 48-pin SSOP package