NXP Semiconductors MPC755BVT300LE

Overview

MPC755BVT300LE from NXP Semiconductors (formerly Freescale) is a 300 MHz PowerPC™ RISC microprocessor implementing the 60x bus architecture, featuring integrated L2 cache controller, 32 KB instruction and data L1 caches, and hardware-supported power management modes (doze, nap, sleep). It targets embedded control and networking applications requiring deterministic real-time performance with thermal-aware operation.

For engineers reviewing the MPC755BVT300LE datasheet, MPC755BVT300LE pinout, MPC755BVT300LE application, or MPC755BVT300LE equivalent, key selection criteria include its 360-ball CBGA package, 2.0 V core supply with ±100 mV tolerance, 25–100 MHz SYSCLK input range, L2 interface supporting up to 1 MB two-way set-associative cache, and on-die thermal sensor with ±12°C accuracy.

Technical Context

The MPC755BVT300LE implements a superscalar, out-of-order execution PowerPC core with dual fixed-point units, a pipelined floating-point unit compliant with IEEE 754, and dual 32 KB eight-way set-associative L1 caches. Its 60x bus interface supports 32-bit addressing and 64-bit data transfers at configurable bus-to-core ratios (2x–10x).

It integrates an L2 cache controller with dedicated 17-bit address and 64-bit data buses, supporting synchronous BurstRAMs in flow-through or pipelined modes. The on-die Thermal Assist Unit (TAU) includes a calibrated junction temperature sensor, comparator, and dedicated SPRs for software-regulated thermal management.

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 with enhanced thermal and mechanical stability over plastic alternatives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC755BVT300LE, MPC745BVT300LE removes L2 interface capability but retains identical pinout and power envelope, while MPC7447A increases peak throughput fivefold at the cost of doubled power draw and incompatible cache architecture - making MPC755BVT300LE optimal for thermally constrained, cache-sensitive embedded control where deterministic latency outweighs raw speed.

Availability

MPC755BVT300LE is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for MPC755BVT300LE 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.

The MPC755BVT300LE belongs to NXP's PowerPC 7xx family, designed specifically for high-reliability embedded control systems demanding low-power operation, hardware-assisted thermal management, and deterministic real-time performance in harsh environments.

FAQ

What is the maximum supported L2 cache size for MPC755BVT300LE?

The MPC755BVT300LE supports external L2 cache sizes of 256 KB, 512 KB, or 1 MB in two-way set-associative configuration. Its L2 interface uses a 17-bit address bus and 64-bit data bus, with configurable line sizes (64-byte for 256/512 KB, 128-byte for 1 MB) and support for synchronous BurstRAM timing modes including 3-1-1-1 and strobeless 4-1-1-1. This capability is absent in the MPC745 variant.

Does MPC755BVT300LE require external voltage regulators for all power domains?

Yes, MPC755BVT300LE requires three independent regulated supplies: VDD (2.0 V ±100 mV) for the core, OVDD (2.5 V or 3.3 V) for the 60x bus I/O, and L2OVDD (2.5 V or 3.3 V) for the L2 bus I/O. Each domain has separate pins and decoupling requirements specified in Section 4.1 of the hardware specifications. The PLL and L2 DLL also require dedicated AVDD and L2AVDD supplies at 1.8–2.1 V.

How does the Thermal Assist Unit (TAU) in MPC755BVT300LE function in practice?

The MPC755BVT300LE TAU integrates an on-die thermal sensor with ±12°C accuracy and 4°C resolution, feeding raw data to dedicated SPRs (THRM0–THRM3). Software reads these registers and applies calibration coefficients from AN1800/D to derive absolute junction temperature. When thresholds are exceeded, THRM_INT asserts to trigger OS-level throttling - such as reducing bus frequency or entering nap mode - without external sensors or analog circuitry.

Is MPC755BVT300LE pin-compatible with other members of the MPC7xx family?

MPC755BVT300LE shares the same 360-ball CBGA footprint and pin assignments with MPC755 variants (e.g., MPC755BVT350LE, MPC755BVT400LE) but is not pin-compatible with MPC745 (which uses 255-ball PBGA) or MPC7447A (which uses 516-ball PBGA). Signal-level compatibility exists with MPC750-series processors on the 60x bus, but voltage thresholds and timing parameters differ per speed grade and revision.

What boot configuration options are available for MPC755BVT300LE at power-on reset?

At power-on, MPC755BVT300LE samples BVSEL and L2VSEL pins to configure I/O voltage thresholds (2.5 V or 3.3 V), and PLL_CFG[0:3] pins to set bus-to-core frequency multiplication (e.g., 3x for 300 MHz core from 100 MHz SYSCLK). These pins must remain stable after HRESET assertion; changing them during operation violates specification and may cause bus timing violations or PLL unlock.