NXP Semiconductors MPC755CPX400LER2

Overview

MPC755CPX400LER2 from NXP Semiconductors (formerly Freescale) is a 400 MHz PowerPC™ RISC microprocessor implementing the 60x bus architecture, featuring a 32 KB instruction cache, 32 KB data cache, integrated L2 cache controller, and support for 2.5 V/3.3 V I/O interfaces. It targets low-power embedded control in networking infrastructure and industrial computing systems.

For engineers reviewing the MPC755CPX400LER2 datasheet, MPC755CPX400LER2 pinout, MPC755CPX400LER2 application, or MPC755CPX400LER2 equivalent, key selection criteria include core frequency (400 MHz), L2 cache interface capability, thermal management assist unit (TAU), 360-ball CBGA or PBGA package options, and compatibility with MPC750-family software toolchains.

Technical Context

The MPC755CPX400LER2 implements a dual-integer-unit, out-of-order execution pipeline with branch prediction (512-entry BHT), 64-entry BTIC, and hardware dependency detection across six execution units. Its memory subsystem includes dual 32 KB eight-way set-associative L1 caches and an external L2 cache interface supporting 256 KB–1 MB two-way set-associative configurations.

It integrates a thermal sensor with ±12°C accuracy, programmable TAU registers, and four power states (doze, nap, sleep, dynamic management). The 60x bus interface supports 32-bit addressing, 64-bit data transfers, and configurable bus-to-core multipliers (2x–10x), with separate 2.0 V core and 2.5/3.3 V I/O supplies.

Key Specifications

Pinout & Package

Package: 360-ball Ceramic Ball Grid Array (CBGA) or Plastic Ball Grid Array (PBGA), 27 mm × 27 mm, 1.27 mm pitch. Thermal resistance R_θJA = 24°C/W (CBGA, natural convection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC745CPX400LER2, the MPC755CPX400LER2 adds L2 cache control for predictable memory latency in real-time systems; compared with MPC7400VR400BE, it offers lower power and smaller footprint but lacks vector processing-making it optimal for deterministic control over compute-intensive tasks.

Availability

MPC755CPX400LER2 is available at Aetrix Electronics and suitable for industrial PLCs, telecom infrastructure equipment, avionics data concentrators, and network router control planes requiring stable component supply across extended product lifecycles.

Supply support for MPC755CPX400LER2 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 markets, with deep heritage in Power Architecture technology.

The MPC755CPX400LER2 belongs to the MPC750 family of RISC microprocessors designed specifically for cost-sensitive, thermally constrained embedded control applications demanding high determinism and long-term supply stability.

FAQ

What is the maximum guaranteed operating frequency of the MPC755CPX400LER2?

The MPC755CPX400LER2 is rated for a maximum guaranteed core frequency of 400 MHz under recommended operating conditions (VDD = 1.9–2.1 V, Tj ≤ 105°C, SYSCLK = 100 MHz with valid PLL_CFG settings). This rating is verified per Freescale's AC electrical specifications in Table 8 of the MPC755EC Rev. 8 datasheet and applies to both CBGA and PBGA package variants of the MPC755CPX400LER2.

Does the MPC755CPX400LER2 support external L2 cache, and what configurations are validated?

Yes, the MPC755CPX400LER2 includes a dedicated L2 cache interface supporting 256 KB, 512 KB, and 1 MB two-way set-associative external SRAM-based caches. Validated configurations include synchronous BurstRAMs with 3-1-1-1 or strobeless 4-1-1-1 timing, 64-byte lines (256/512 KB) or 128-byte lines (1 MB), and core-to-L2 frequency divisors of ÷1, ÷1.5, ÷2, ÷2.5, and ÷3 - all explicitly documented for the MPC755CPX400LER2 in Section 2.4 of the MPC755EC Rev. 8 specification.

How does the thermal management assist unit (TAU) function in the MPC755CPX400LER2?

The MPC755CPX400LER2 integrates an on-die thermal sensor with 4°C resolution and ±12°C accuracy, feeding digital output to THRM0–THRM3 special-purpose registers. Software reads these registers to derive junction temperature and trigger actions like clock throttling or entering nap/sleep mode. The TAU's comparator and control logic generate thermal interrupts, enabling closed-loop regulation - a feature confirmed for the MPC755CPX400LER2 in Table 5 and Section 4.1.3 of the MPC755EC Rev. 8 datasheet.

What are the supported I/O voltage levels for the MPC755CPX400LER2 processor and L2 buses?

The MPC755CPX400LER2 supports 2.5 V or 3.3 V I/O operation on both the processor bus (OVDD) and L2 bus (L2OVDD), selected independently via BVSEL and L2VSEL configuration pins sampled at reset. Input thresholds follow JEDEC standards: VIH = 1.6 V (2.5 V mode) or 2.0 V (3.3 V mode); VOL ≤ 0.45 V (2.5 V) or ≤ 0.4 V (3.3 V) - values specified in Tables 2 and 6 of the MPC755EC Rev. 8 document for the MPC755CPX400LER2.

Is the MPC755CPX400LER2 pin-compatible with other members of the MPC750 family?

The MPC755CPX400LER2 shares the same 360-ball CBGA/PBGA footprint and pinout as other MPC755 speed grades (e.g., MPC755CPX350LER2), but is not pin-compatible with the MPC745 (255-ball PBGA only) or MPC7400 (352-ball TBGA). Pin assignments for HRESET, SYSCLK, BVSEL, L2VSEL, and PLL_CFG[0:3] are identical across all MPC755 variants, as confirmed in Section 5 ("Pin Assignments") of the MPC755EC Rev. 8 datasheet for the MPC755CPX400LER2.