MPC905

* Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.

The MPC905 is a six output clock generation device targeted to provide the clocks required in a 3.3V or 5.0V PCI environment. The device operates from a 3.3V supply and can interface to either a TTL input or an external crystal. The inputs to the device can be driven with 5.0V when the V_CC is at 3.3V. The outputs of the MPC905 meet all of the specifications of the PCI standard.

• Six Low Skew Outputs
• Synchronous Output Enables for Power Management
• Low Voltage Operation
• XTAL Oscillator Interface
• 16-Lead SOIC Package
• 5.0V Tolerant Enable Inputs The MPC905 device is targeted for PCI bus or processor bus environments with up to 12 clock loads. Each of the six outputs on the MPC905 can drive two series terminated 50W transmission lines. This capability effectively makes the MPC905 a 1:12 fanout buffer.

The MPC905 offers two synchronous enable inputs to allow users flexibility in developing power management features for their designs.

MPC905 enable signals are active HIGH inputs. A logic '0' on the Enable1 will pull outputs 0 to 4 into the logic '0' state. A logic '1' on the Enable1 input will result in outputs 0 to 4 to be toggling. A logic '0' on Enable2 will cause output BLK5 to a logic '0' state, whereas a logic '1' on Enable2 will cause output BLK5 to toggle. The oscillator remains on.

The Enable2 input can be used to disable any high power device for system power savings during periods of inactivity. Both enable inputs are synchronized internal to the chip so that the output disabling will happen only when the outputs are already LOW. MPC905 feature guarantees no runt pulses will be generated during enabling and disabling.