NXP Semiconductors MPC755BPX350LE

Overview

MPC755BPX350LE from NXP Semiconductors (formerly Freescale) is a 350 MHz PowerPC™ RISC microprocessor implementing the 60x bus architecture, featuring integrated L2 cache controller, 32 KB instruction and data L1 caches, and dynamic power management (doze/nap/sleep modes). It targets embedded networking, industrial control, and low-power telecom infrastructure requiring deterministic real-time execution and thermal-aware operation.

For engineers reviewing the MPC755BPX350LE datasheet, MPC755BPX350LE pinout, MPC755BPX350LE application, or MPC755BPX350LE equivalent, key selection criteria include its 360-ball CBGA package, 2.0 V core supply with 2.5/3.3 V I/O support, 350 MHz maximum core frequency, and hardware-assisted thermal management via on-die sensor and TAU registers.

Technical Context

The MPC755BPX350LE implements a superscalar, out-of-order execution PowerPC core with dual fixed-point units, a fully pipelined floating-point unit supporting IEEE 754 single/double precision, and a 64-entry branch target instruction cache (BTIC) with 512-entry branch history table for dynamic prediction. Its memory subsystem includes dual 32 KB eight-way set-associative L1 caches (instruction/data), hardware-managed TLBs (128-entry each), and an external L2 cache interface supporting 256 KB–1 MB two-way set-associative configurations.

It integrates a 60x bus interface with 32-bit address/64-bit data capability, selectable bus-to-core multipliers (up to 7.5×), parity-checked address/data buses, and JTAG/COP debug support. The thermal management assist unit (TAU) provides junction temperature monitoring with ±12°C accuracy and programmable interrupt generation, enabling software-controlled thermal throttling without external sensors.

Key Specifications

Pinout & Package

Package: 360-ball Ceramic Ball Grid Array (CBGA), 27 mm × 27 mm, 1.27 mm ball pitch, RoHS-compliant. Designed for high-reliability industrial and telecom applications requiring long-term thermal stability and low CTE mismatch with PCB substrates.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RISC microprocessor applications.

Compared with MPC755BPX350LE, the MPC745BPX350LE removes L2 interface logic to reduce die area and cost, while the MPC750FXZU350LE trades ceramic thermal performance for PBGA manufacturability-both require PCB layout changes due to different mechanical footprints and thermal pad requirements.

Availability

MPC755BPX350LE is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom baseband processors, network security appliances, medical imaging subsystems, and embedded test equipment requiring stable component supply across extended product lifecycles.

Supply support for MPC755BPX350LE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in Power Architecture technology acquired from Freescale.

The MPC755BPX350LE belongs to the PowerPC 7xx family designed specifically for high-performance, thermally constrained embedded systems requiring real-time determinism, hardware-assisted virtualization, and long-term industrial qualification.

FAQ

What is the maximum operating temperature for the MPC755BPX350LE?

The MPC755BPX350LE has a specified die-junction temperature range of 0°C to 105°C under recommended operating conditions. Its ceramic BGA package achieves a junction-to-ambient thermal resistance of 24°C/W under natural convection, enabling reliable operation at full 350 MHz frequency in sealed enclosures without forced airflow. Thermal management must account for power dissipation up to 6.0 W in full-power mode.

Does the MPC755BPX350LE support little-endian mode?

Yes, the MPC755BPX350LE supports both big-endian and little-endian byte addressing through hardware configuration. This capability is implemented in the load/store unit and applies to all memory accesses, including instruction fetch, data loads/stores, and cache operations. Endianness is selected at boot via MSR[LE] bit and can be dynamically switched during runtime using the eciwx instruction.

How does the L2 cache interface of the MPC755BPX350LE differ from the MPC745BPX350LE?

The MPC755BPX350LE includes a dedicated L2 cache controller, L2 tags, and 64-bit L2 data bus supporting 256 KB–1 MB external SRAM-based caches, while the MPC745BPX350LE omits this entire subsystem. This difference means MPC755BPX350LE can sustain higher memory bandwidth for data-intensive workloads like packet buffering or image processing, whereas MPC745BPX350LE relies solely on its 32 KB L1 caches and main memory.

What debug interfaces are available on the MPC755BPX350LE?

The MPC755BPX350LE provides IEEE 1149.1 JTAG boundary scan for structural testing and COP (coprocessor) interface for real-time debugging. JTAG supports full-scan access to internal registers and memory, while COP enables non-intrusive instruction tracing, breakpoint setting, and memory inspection without halting the CPU core-critical for validating real-time behavior in safety-critical applications.

Can the MPC755BPX350LE operate with a 2.5 V I/O supply while maintaining 350 MHz core frequency?

Yes, the MPC755BPX350LE supports 2.5 V I/O supply (OVDD/L2OVDD) simultaneously with its 2.0 V core supply (VDD) at 350 MHz operation. The BVSEL and L2VSEL pins configure input thresholds accordingly, and DC specifications guarantee VIH ≥ 1.6 V and VOL ≤ 0.45 V under these conditions. This dual-voltage capability simplifies integration with 2.5 V peripheral logic without level-shifting circuitry.