NXP Semiconductors MC7457VG1267LC

Overview

MC7457VG1267LC from Freescale Semiconductor is a 32-bit PowerPC G4 RISC microprocessor with 512-Kbyte on-chip L2 cache, 1.3 V core supply, and dedicated L3 cache interface supporting up to 4 Mbytes of external SRAM. It integrates a superscalar core with double-precision FPU, AltiVec SIMD unit, and MPX/60x bus protocol support for high-performance computing and networking systems.

For engineers reviewing the MC7457VG1267LC datasheet, MC7457VG1267LC pinout, MC7457VG1267LC application, or MC7457VG1267LC equivalent, key selection criteria include L3 interface voltage configuration (1.5 V / 1.8 V / 2.5 V), thermal resistance (RθJA = 20°C/W), 483-ball CBGA package, 7-stage pipeline, and footprint compatibility with MPC7455 in 1.3 V core applications.

Technical Context

The MC7457VG1267LC implements a fully static, 0.13 μm CMOS design with eleven independent execution units-including three integer units, one FPU, four vector units, and a branch processing unit with 128-entry BTIC and 2048-entry BHT. Its Harvard L1 cache architecture features separate 32-Kbyte 8-way instruction and data caches with PLRU replacement and hardware MESI coherency.

It supports dual MMUs with 128-entry 2-way TLBs, 52-bit virtual addressing, and configurable L3 interface operating at 64-bit width with programmable write-back/write-through policy. The processor delivers three-instruction-per-cycle dispatch via FIQ/VIQ/GIQ queues and guarantees precise exception handling through a 16-entry in-order completion queue.

Key Specifications

Pinout & Package

MC7457VG1267LC uses a surface-mount 483-ball ceramic ball grid array (CBGA) package with 1.27 mm pitch, designed for high-density routing and thermal dissipation in embedded computing modules. Pin assignments follow the MPC7457 Rev. 8 specification with dedicated banks for core power (VDD/AVDD), I/O supplies (OVDD/GVDD), system clock (SYSCLK), JTAG/COP debug interface, MPX bus signals, and L3 SRAM interface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC7455EC and MPC7447EC, MC7457VG1267LC provides unique L3 interface capability and larger L2 cache-enabling scalable memory hierarchies in networking and compute platforms where external SRAM integration is essential for performance isolation and capacity expansion.

Availability

MC7457VG1267LC is available at Aetrix Electronics and suitable for network infrastructure, industrial computing, and telecom baseband applications requiring stable component supply, long-lifecycle support, and verified thermal performance in convection-cooled environments.

Supply support for MC7457VG1267LC 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, connectivity, and analog solutions for automotive, industrial, and networking markets.

The MPC7457VG1267LC belongs to the PowerPC G4 microprocessor family, designed specifically for high-throughput, low-latency embedded computing in communications infrastructure and real-time control systems.

FAQ

What is the core supply voltage requirement for MC7457VG1267LC?

The MC7457VG1267LC requires a nominal 1.3 V ±50 mV DC core supply (VDD/AVDD). This tight tolerance ensures stable operation of the 0.13 μm CMOS logic and prevents timing violations or thermal runaway. Deviations beyond ±50 mV may cause functional failure or accelerated aging, and the device must not operate outside the absolute maximum range of –0.3 V to 1.60 V.

Does MC7457VG1267LC support pin-compatible replacement for MPC7455EC?

Yes, MC7457VG1267LC is a footprint-compatible, drop-in replacement for MPC7455EC in applications using a 1.3 V core supply. Both use the same 483-ball CBGA package and MPX bus interface. However, MC7457VG1267LC adds L3 interface pins and supports larger L2 cache, so PCB layout must accommodate additional power and signal routing if L3 functionality is enabled.

What L3 SRAM configurations does MC7457VG1267LC support?

MC7457VG1267LC supports 1 MB, 2 MB, or 4 MB total external SRAM space via its L3 interface. Up to 2 MB can be configured as cache; the remainder must be used as private memory. Supported SRAM types include MSUG2 DDR, PB2 pipelined, and late-write synchronous burst devices, all operating on a 64-bit data bus with byte-level parity.

How does the thermal management system function in MC7457VG1267LC?

The MC7457VG1267LC implements thermal management through three supervisor-level registers and a dedicated thermal management exception. Software can throttle instruction fetching or trigger Nap/Sleep/Deep Sleep modes based on die-junction temperature (Tj ≤ 105°C). The 20°C/W junction-to-ambient thermal resistance assumes natural convection on a standard PCB, guiding heatsink selection.

What debugging interfaces are available on MC7457VG1267LC?

MC7457VG1267LC provides IEEE 1149.1 JTAG boundary-scan for in-system test and COP (Controller On Processor) interface for real-time debug and trace. These interfaces support full visibility into register state, cache contents, and pipeline activity without halting execution, enabling robust validation of complex multiprocessing and real-time applications.