MPC745CPX350LE

Overview

The MPC745CPX350LE is a PowerPC RISC microprocessor operating at a maximum core frequency of 350 MHz. It implements the PowerPC instruction set architecture and features a fully-static logic design fabricated on a 0.22 µm CMOS process with six-layer metal technology. The device integrates two fixed-point units, a floating-point unit, and separate 32 Kbyte instruction and data L1 caches. Unlike the MPC755, this model lacks an internal L2 cache controller but supports external L2 SRAMs via a dedicated interface.

Feature Summary

• Implements the PowerPC instruction set architecture with out-of-order execution capabilities
• Integrates dual fixed-point units and a hardware-supported floating-point unit for IEEE 754 compliance
• Features non-blocking 32 Kbyte instruction and data L1 caches with configurable coherency modes
• Includes a dedicated interface for external Level 2 cache controllers and memory

Applications

• Low-cost embedded systems requiring reduced power consumption
• Network infrastructure equipment utilizing the 60x bus interface
• Industrial control applications benefiting from integrated thermal management assist units

Procurement Notes

Verify that the specific part number corresponds to the MPC745 variant which excludes the internal L2 cache controller found in the MPC755. Confirm the package type matches the required surface mount configuration, as the MPC745 is offered exclusively in a plastic ball grid array (PBGA) format. Ensure compatibility with the intended system voltage levels for both the processor bus and I/O interfaces before integration.

Selection Notes

Select this component when a PowerPC-based solution is required without the overhead of an integrated L2 cache controller. The MPC745 allows designers to implement custom external memory solutions using synchronous BurstRAMs. Consider the available static power saving modes, including doze, nap, and sleep, if energy efficiency is a primary design constraint for the target application environment.

Part Context

This microprocessor belongs to the MPC750 family, sharing architectural similarities with the MPC755. The defining distinction is the absence of the internal L2 tag and cache interface in the MPC745. This variation targets cost-sensitive designs where external memory management is preferred or necessary. The device maintains full compatibility with the 60x processor interface standard.

Replacement Considerations

The MPC755CPX350LE serves as a functional substitute that includes an additional internal L2 cache controller. Designers must account for the different pin counts and package types, as the MPC755 utilizes a ceramic ball grid array (CBGA) or PBGA while the MPC745 uses only PBGA.