NXP Semiconductors MC7447AHX1333LB

Overview

MC7447AHX1333LB from Freescale Semiconductor is a 1333 MHz PowerPC G4 RISC microprocessor implementing the full 32-bit PowerPC architecture, featuring a superscalar core with double-precision FPU and AltiVec SIMD unit, 32-Kbyte L1 instruction/data caches, and an integrated 512-Kbyte unified L2 cache - deployed in high-performance networking and embedded computing systems.

For engineers reviewing the MC7447AHX1333LB datasheet, MC7447AHX1333LB pinout, MC7447AHX1333LB application, or MC7447AHX1333LB equivalent, key selection criteria include confirmed 1333 MHz core frequency at 1.3 V ±50 mV, 360-ball ceramic BGA (HCTE) package, DFS-enabled dynamic power management, temperature diode integration, and MPX/60x bus protocol support for system memory interfacing.

Technical Context

The MC7447AHX1333LB implements a seven-stage pipeline with up to three-issue dispatch (FIQ/VIQ/GIQ), 16-entry completion queue, and hardware-enforced MESI coherency for multiprocessor systems. Its memory subsystem supports both big- and little-endian modes, 4-Kbyte page translation via 128-entry dual TLBs, and programmable write-back/write-through caching per page or block.

It integrates dedicated execution units: four integer units (three identical SFX + one multifunction IU2), five-stage IEEE 754-compliant FPU, four vector units (VIU1/VIU2/VFPU/VPU), and a branch processing unit with 128-entry BTIC and 2048-entry BHT - enabling up to 16 instructions in flight and single-cycle throughput for most scalar operations.

Key Specifications

Pinout & Package

MC7447AHX1333LB is housed in a surface-mount 360-ball ceramic ball grid array (HCTE) package compliant with RoHS. The package supports 1.3 V core and 1.8 V / 2.5 V I/O supplies, with thermal resistance R_θJA = 26°C/W (natural convection, 1s board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC7447EC, MC7447AHX1333LB adds DFS and thermal diode for adaptive power/thermal management; compared with MPC7447AEC, it specifies the exact 1333 MHz speed grade - making it optimal for designs requiring guaranteed frequency headroom and runtime thermal awareness.

Availability

MC7447AHX1333LB is available at Aetrix Electronics and suitable for network infrastructure, industrial automation, and aerospace computing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing of legacy PowerPC solutions.

Supply support for MC7447AHX1333LB 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) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and networking markets.

The MPC7447A product line was engineered for high-performance embedded computing - delivering G4 PowerPC architecture with enhanced L2 cache, DFS, and thermal sensing to extend viability in demanding networking and control applications.

FAQ

What is the maximum guaranteed operating frequency of the MC7447AHX1333LB?

The MC7447AHX1333LB is speed-binned and guaranteed to operate at 1333 MHz under nominal conditions (1.3 V ±50 mV core supply, junction temperature ≤105°C). This rating is validated per Freescale's Rev. 5 hardware specifications and reflects tested AC timing compliance at this frequency - not a typical or average value.

Does the MC7447AHX1333LB support dynamic voltage scaling in addition to Dynamic Frequency Switching?

The MC7447AHX1333LB supports voltage derating per Section 5.3 of its hardware specification: core voltage may be reduced to 1.2 V ±50 mV to lower power, but only if corresponding frequency constraints are observed. However, MC7447AHX1333LB does not implement closed-loop dynamic voltage scaling - voltage changes require system-level reconfiguration, not autonomous on-die regulation.

Is the MC7447AHX1333LB pin-compatible with the MPC7447 series?

Yes - the MC7447AHX1333LB uses the same 360-ball HCTE package and pinout as the MPC7447, MPC7447AEC, and MPC7447EC. Freescale explicitly states it is a "footprint-compatible, drop-in replacement" in MPC7447 applications when supplied with 1.3 V core voltage, confirming mechanical and electrical pin equivalence.

What thermal management features are integrated into the MC7447AHX1333LB?

The MC7447AHX1333LB integrates two key thermal features: a calibrated on-die temperature diode for real-time junction temperature monitoring, and Dynamic Frequency Switching (DFS) to halve core frequency under thermal stress. These work in tandem - software reads the diode output and triggers DFS to maintain safe Tj ≤105°C without external thermal sensors or hardware throttling circuits.

Can the MC7447AHX1333LB execute little-endian code, and how is endianness configured?

Yes - the MC7447AHX1333LB supports both big- and little-endian operation, including misaligned little-endian accesses. Endianness is controlled dynamically via the MSR[LE] bit in the Machine State Register, allowing runtime switching between modes without reset. The processor boots in big-endian mode by default, but firmware or OS can enable little-endian execution transparently.