NXP Semiconductors MC7447AVS1267LB

Overview

MC7447AVS1267LB from Freescale Semiconductor is a 32-bit PowerPC G4 RISC microprocessor with 512-Kbyte unified L2 cache, 1.3 V core supply, and 1267 MHz maximum core frequency. It integrates superscalar execution, AltiVec SIMD unit, dual-precision FPU, and hardware-enforced MESI coherency-designed for high-performance networking and embedded computing systems requiring deterministic real-time throughput.

For engineers reviewing the MC7447AVS1267LB datasheet, MC7447AVS1267LB pinout, MC7447AVS1267LB application, or MC7447AVS1267LB equivalent, key selection criteria include dynamic frequency switching (DFS) support, temperature diode integration, 360-ball ceramic BGA package compatibility, and MPX/60x bus protocol compliance for legacy PowerPC system upgrades.

Technical Context

The MC7447AVS1267LB implements a seven-stage superscalar pipeline with three issue queues (FIQ, VIQ, GIQ), 16-entry completion queue, and eleven independent execution units-including four integer units, five-stage FPU, and four vector units supporting AltiVec. It features separate 32-Kbyte L1 instruction and data caches with PLRU replacement and hardware-managed MESI coherency.

Its memory subsystem includes a fully pipelined 512-Kbyte eight-way set-associative L2 cache delivering 32 bytes/cycle to L1, 9-cycle L1 data miss latency on L2 hit, and support for both big- and little-endian operation. Thermal management includes DFS (halving core frequency in software), Nap/Sleep/Deep Sleep modes, and an on-die temperature diode.

Key Specifications

Pinout & Package

MC7447AVS1267LB is housed in a surface-mount 360-ball ceramic ball grid array (HCTE) package with 1.27 mm pitch, designed for high-reliability industrial and telecom applications. The package supports controlled impedance routing, thermal vias to internal ground planes, and compliant solder joint formation under JEDEC J-STD-020 reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC7447AEC1267B and MPC7447AVT1267B, MC7447AVS1267LB offers optimal cost-performance balance for commercial telecom and industrial applications operating within 0–105°C junction range, with BGA packaging enabling higher routing density and better high-frequency signal integrity than LGA alternatives.

Availability

MC7447AVS1267LB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and secure gateway applications requiring stable component supply, long-lifecycle support, and RoHS-compliant ceramic packaging.

Supply support for MC7447AVS1267LB 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-throughput, low-latency control plane processing in carrier-class networking equipment and real-time embedded systems.

FAQ

What is the maximum supported core frequency for MC7447AVS1267LB?

The MC7447AVS1267LB is factory-sorted and guaranteed to operate at a maximum core frequency of 1267 MHz when supplied with 1.3 V ± 50 mV core voltage and maintained within its 0–105°C junction temperature range. This frequency is achieved using an 8× PLL multiplier on a 158.375 MHz SYSCLK input, as specified in Table 8 of the hardware specifications document.

Does MC7447AVS1267LB support dynamic voltage scaling in addition to dynamic frequency switching?

No, MC7447AVS1267LB does not support dynamic voltage scaling. It operates at fixed nominal core voltage (1.3 V ± 50 mV) or a derated 1.2 V ± 50 mV, as defined in Section 5.3 of the hardware specifications. Dynamic frequency switching (DFS) is supported to halve core frequency and reduce power, but voltage levels are not dynamically adjusted during operation.

Is MC7447AVS1267LB pin-compatible with earlier MPC7447 variants?

Yes, MC7447AVS1267LB is footprint-compatible and functions as a drop-in replacement for MPC7447 designs when the core power supply is 1.3 V, as explicitly stated in the Features section of the hardware specifications. It retains identical pin assignments, bus protocols, and register-level compatibility with the MPC7447, while adding DFS and temperature diode functionality.

What thermal resistance values apply to MC7447AVS1267LB in a four-layer PCB configuration?

In a four-layer (2s2p) PCB configuration with natural convection, MC7447AVS1267LB has a junction-to-ambient thermal resistance (RθJMA) of 19°C/W, and with 200 ft/min airflow, it improves to 16°C/W, per Table 5 of the hardware specifications. These values assume proper thermal via placement beneath the package and adherence to Freescale's recommended padstack and copper pour guidelines.

Can MC7447AVS1267LB operate with 2.5 V I/O voltage while using 1.3 V core voltage?

Yes, MC7447AVS1267LB supports 2.5 V I/O operation while using 1.3 V core voltage. As specified in Table 4 and Table 2, OVDD may be set to 2.5 V ± 5% when BVSEL is asserted high (HRESET or OVDD), provided OVDD does not exceed VDD by more than 2.0 V during normal operation - a condition satisfied by the 1.2 V margin between 2.5 V and 1.3 V.