NXP Semiconductors MC7447AHX1000NB

Overview

MC7447AHX1000NB from Freescale Semiconductor is a 1000 MHz PowerPC G4 RISC microprocessor with 32-Kbyte L1 instruction and data caches, 512-Kbyte unified on-die L2 cache, and integrated AltiVec SIMD engine. It implements the full 32-bit PowerPC architecture and targets high-performance networking and embedded computing systems requiring deterministic real-time processing and IEEE 754-compliant floating-point computation.

For engineers reviewing the MC7447AHX1000NB datasheet, MC7447AHX1000NB pinout, MC7447AHX1000NB application, or MC7447AHX1000NB equivalent, key selection considerations include its 1.3 V core supply, 360-ball ceramic BGA (HCTE) package, dynamic frequency switching (DFS), on-die temperature diode, and support for both 1.8 V and 2.5 V I/O bus operation.

Technical Context

The MC7447AHX1000NB features a seven-stage superscalar pipeline with up to 16 in-flight instructions, eleven independent execution units (including four integer, five vector, and one FPU), and hardware-enforced MESI cache coherency for multiprocessor systems. Its memory subsystem supports MPX and subset 60x bus protocols, with 9-cycle L1 miss latency on L2 hit and 256-bit L2-to-L1 interface bandwidth.

It integrates dual MMUs (128-entry 2-way TLBs), JTAG/COP debug interface, performance monitor unit, and three power-saving modes (Nap, Sleep, Deep Sleep). Dynamic Frequency Switching enables software-controlled halving of core frequency to reduce power, while the on-die temperature diode provides thermal monitoring without external sensors.

Key Specifications

Pinout & Package

MC7447AHX1000NB uses a surface-mount 360-ball ceramic ball grid array (HCTE) package compliant with RoHS. The package supports thermal dissipation via soldered bottom-side thermal pad and is designed for high-speed signal integrity in multi-layer PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC7447AHX1000NB, the 1267 MHz and 1333 MHz alternatives offer linear performance scaling within identical thermal and electrical envelopes, but require revalidation of bus timing margins, power delivery stability, and junction temperature under worst-case workload conditions.

Availability

MC7447AHX1000NB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, avionics display, and medical imaging systems requiring stable component supply and long-term lifecycle support.

Supply support for MC7447AHX1000NB 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, analog, and connectivity solutions for automotive, industrial, and networking markets.

The MPC7447A product line was designed as a high-performance, thermally efficient PowerPC G4 upgrade for legacy MPC74xx-based systems, emphasizing backward compatibility, AltiVec acceleration, and robust power management for fanless embedded deployments.

FAQ

What is the core voltage requirement for stable operation of the MC7447AHX1000NB?

The MC7447AHX1000NB requires a nominal core supply of 1.3 V ±50 mV DC. Operation outside this range-especially exceeding 1.35 V or dropping below 1.25 V-may cause timing violations or functional failure. Derated operation at 1.2 V is supported only with corresponding frequency reduction per Section 5.3 of the hardware specifications.

Does the MC7447AHX1000NB support pin-compatible replacement of earlier MPC7447 variants?

Yes, the MC7447AHX1000NB is a footprint-compatible, drop-in replacement for the MPC7447 in applications using a 1.3 V core supply. It adds Dynamic Frequency Switching and an on-die temperature diode but maintains identical pinout, electrical signaling, and register-level compatibility with the MPC7447 per Freescale documentation Rev. 5.

How does the Dynamic Frequency Switching (DFS) feature function in the MC7447AHX1000NB?

The MC7447AHX1000NB implements DFS via two dedicated control pins (DFS[0:1]) that allow software to halve the core frequency-from 1000 MHz to 500 MHz-without resetting the processor. This reduces dynamic power by ~75% and junction temperature, enabling thermal throttling in enclosed or passive-cooled systems while maintaining full register state and cache coherency.

What thermal management features are integrated into the MC7447AHX1000NB?

The MC7447AHX1000NB includes an on-die temperature diode (THERM pin), Dynamic Frequency Switching, and three hardware power states (Nap, Sleep, Deep Sleep). These enable closed-loop thermal control: the diode provides real-time junction temperature feedback, DFS lowers frequency under thermal stress, and Deep Sleep disables the PLL to minimize leakage current when idle.

Can the MC7447AHX1000NB operate with both 1.8 V and 2.5 V I/O buses?

Yes, the MC7447AHX1000NB supports dual I/O voltage modes. The BVSEL pin selects between 1.8 V and 2.5 V operation at HRESET negation. When BVSEL = 0, OVDD must be 1.8 V ±5%; when BVSEL = 1 or tied to HRESET, OVDD must be 2.5 V ±5%. Input thresholds and output drive strength scale accordingly per Table 3 in the hardware specifications.