cdc9841 pc motherboard clock synthesizer/driver with 3-state outputs
The CDC9841 is a high-performance clock synthesizer/driver designed to generate all required clock signals necessary for a high-performance PC motherboard. It provides four programmable central processing unit (CPU) clock outputs and six peripheral-component-interconnect (PCI) clock outputs, along with fixed-frequency outputs for 24-MHz and 12-MHz applications.
The device generates all output frequencies from a single 14.31818-MHz crystal input using two internal phase-lock loops (PLLs). It features on-chip loop filters that eliminate the need for external components, operates at 3.3 V, and is packaged in a plastic small-outline package with distributed Vcc and ground pins to reduce switching noise.
| Supply Voltage (VCC) | 3.135 V to 3.6 V |
|---|---|
| Operating Temperature Range | 0°C to 70°C |
| CPU Clock Frequencies | 50 MHz, 60 MHz, or 66 MHz |
| Reference Input Frequency | 14.31818-MHz Crystal |
| Package Type | DW Package (Plastic Small-Outline) |
The stabilization time required following power up is 5 ms.
The CDC9841 is a high-performance clock synthesizer/driver that generates all required clock signals necessary for a high-performance PC motherboard.
The device has four central processing unit (CPU) clock outputs which are programmable to one of three frequencies via control inputs.
A stabilization time of 5 ms is required following power up and application of a fixed-frequency, fixed-phase signal at the X1 input.