NXP Semiconductors MC7447AHX1000LB

Overview

MC7447AHX1000LB from Freescale Semiconductor is a 32-bit PowerPC G4 RISC microprocessor with 512-Kbyte unified L2 cache, 1.3 V core supply, and 1000 MHz maximum core frequency. It integrates superscalar execution, AltiVec SIMD unit, dual-precision FPU, and hardware-enforced MESI coherency-designed for high-throughput networking and embedded computing systems requiring deterministic real-time processing.

For engineers reviewing the MC7447AHX1000LB datasheet, MC7447AHX1000LB pinout, MC7447AHX1000LB application, or MC7447AHX1000LB equivalent, key selection considerations include its 360-ball ceramic BGA (HCTE) package, dynamic frequency switching (DFS), temperature diode, 9-cycle L1 miss/L2 hit latency, and support for both 1.8 V and 2.5 V I/O bus operation via BVSEL configuration.

Technical Context

The MC7447AHX1000LB implements a seven-stage superscalar pipeline with up to 16 in-flight instructions, three independent issue queues (FIQ/VIQ/GIQ), and eleven execution units-including four integer units, five-stage IEEE 754-compliant FPU, and four AltiVec vector units. Its memory subsystem features separate 32-Kbyte 8-way L1 instruction and data caches with PLRU replacement, plus an on-die 512-Kbyte 8-way unified L2 cache operating at 256-bit width.

It supports MPX and subset 60x bus protocols, hardware TLB reload (128-entry, 2-way set-associative for both I/D), 52-bit virtual addressing, and full JTAG boundary-scan testability. Dynamic power management includes Nap/Sleep/Deep Sleep modes and DFS-enabled core frequency halving-enabling thermal control without software intervention.

Key Specifications

Pinout & Package

MC7447AHX1000LB uses a 360-ball ceramic ball grid array (HCTE) package with 1.27 mm ball pitch, designed for high-reliability industrial and networking applications. The package supports controlled impedance routing, thermal vias under the die pad, and compliant solder reflow profiles per IPC-J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC7447AEC1267B and MPC7445EC1000B, MC7447AHX1000LB uniquely balances 1000 MHz performance, full thermal management capability, and 512-Kbyte L2 capacity-making it optimal for thermally constrained, mid-tier networking and industrial applications where reliability trumps peak clock speed.

Availability

MC7447AHX1000LB is available at Aetrix Electronics and suitable for telecom line cards, industrial control gateways, avionics data concentrators, and medical imaging processors requiring stable component supply across extended product lifecycles.

Supply support for MC7447AHX1000LB 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 MPC7447A family was developed as the fifth-generation G4 PowerPC implementation targeting high-performance, thermally aware embedded computing-emphasizing deterministic latency, hardware coherency, and scalable I/O voltage support for long-lifecycle infrastructure equipment.

FAQ

What is the maximum supported core frequency of the MC7447AHX1000LB?

The MC7447AHX1000LB is rated for a maximum core frequency of 1000 MHz under nominal 1.3 V core supply and 65°C junction temperature. This rating is verified per Freescale's AC timing specifications in Table 8 of the Hardware Specifications document (Rev. 5). Operation above this frequency is not guaranteed and may result in functional failure or timing violations.

Does the MC7447AHX1000LB support dynamic voltage scaling in addition to dynamic frequency switching?

The MC7447AHX1000LB supports core voltage derating to 1.2 V ± 50 mV DC, enabling reduced power consumption when paired with corresponding frequency constraints per Section 5.3 of the datasheet. However, it does not implement closed-loop adaptive voltage scaling-the 1.2 V setting is static and must be configured externally before operation; MC7447AHX1000LB does not adjust VDD autonomously during DFS transitions.

Can the MC7447AHX1000LB operate with 2.5 V I/O while maintaining 1.3 V core supply?

Yes. The MC7447AHX1000LB supports simultaneous 2.5 V I/O (via OVDD) and 1.3 V core (VDD/AVDD) operation when BVSEL is asserted high or tied to HRESET. Per Table 4 and Table 2, OVDD may range from 2.5 V ± 5%, and VDD must remain within 1.3 V ± 50 mV-with strict adherence to the 2.0 V differential limit between OVDD and VDD during normal operation.

What thermal resistance values apply to the MC7447AHX1000LB in a four-layer PCB environment?

In a four-layer (2s2p) PCB with natural convection, the MC7447AHX1000LB exhibits RθJMA = 19°C/W (junction-to-ambient) and RθJB = 10°C/W (junction-to-board), per Table 5 of the Hardware Specifications. With 200 ft/min airflow, RθJMA improves to 16°C/W-critical for validating thermal margin in enclosed networking chassis where ambient exceeds 70°C.

Is the MC7447AHX1000LB pin-compatible with earlier MPC7447 variants?

Yes. The MC7447AHX1000LB is a footprint-compatible, drop-in replacement for the MPC7447 in applications using 1.3 V core supply, as explicitly stated in the "Features" section (Note 2) of the Freescale documentation. Key enhancements-DFS and temperature diode-are functionally additive and do not alter pin assignment, electrical behavior, or timing of existing signals.