NXP Semiconductors KMC7448VU1267ND

Overview

KMC7448VU1267ND from Freescale Semiconductor is a 1700 MHz PowerPC G4 RISC microprocessor with integrated 1-Mbyte unified L2 cache, 32-Kbyte L1 instruction and data caches, and AltiVec SIMD engine - designed for high-throughput networking and computing systems requiring deterministic real-time processing, floating-point acceleration, and hardware cache coherency.

For engineers reviewing the KMC7448VU1267ND datasheet, KMC7448VU1267ND pinout, KMC7448VU1267ND application, or KMC7448VU1267ND equivalent, this page delivers verified electrical specs (1.30 V core, 1.5/1.8/2.5 V I/O), thermal resistance (RθJA = 26°C/W), DFS support, and precise package mapping to 360-ball ceramic BGA (HCTE) - critical for thermal design, bus timing closure, and legacy Power Architecture migration.

Technical Context

The KMC7448VU1267ND implements the PowerPC v1.0 ISA on a 90 nm SOI process with a seven-stage superscalar pipeline, supporting up to three instructions plus one branch per cycle and 16 in-flight instructions. It integrates dual MMUs (128-entry 2-way TLBs), hardware MESI coherency, and separate 32-Kbyte L1 I/D caches with PLRU replacement and parity protection.

Its memory subsystem features an on-die 1-Mbyte eight-way set-associative L2 cache with ECC-capable data storage, programmable write-back/write-through policy, and 256-bit interface to L1; the MPX bus protocol supports up to 16 out-of-order transactions, while dynamic frequency switching enables divide-by-two or divide-by-four core clock scaling for thermal management.

Key Specifications

Pinout & Package

KMC7448VU1267ND 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 requiring thermal robustness and long-term solder joint integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC7447A and MPC8641D, KMC7448VU1267ND uniquely combines AltiVec acceleration, 1-Mbyte L2 ECC, and DFS within the MPX bus ecosystem - making it the sole option for upgrading existing G4-based infrastructure with enhanced reliability and thermal headroom.

Availability

KMC7448VU1267ND is available at Aetrix Electronics and suitable for wireless baseband processing, enterprise router control planes, and industrial automation controllers requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical deployments.

Supply support for KMC7448VU1267ND 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.

KMC7448VU1267ND belongs to the MPC74xx G4 PowerPC family, engineered specifically for high-performance, thermally constrained computing systems in telecom infrastructure and real-time control applications.

FAQ

What is the maximum operating junction temperature for KMC7448VU1267ND?

The KMC7448VU1267ND has a maximum die-junction temperature (Tj) of 105°C under recommended operating conditions. This limit applies across all speed grades and must be maintained during sustained full-power operation; thermal design must account for RθJA = 26°C/W (1s board) and system airflow to avoid derating or thermal shutdown.

Does KMC7448VU1267ND support pin-compatible replacement for earlier MPC7447A designs?

KMC7448VU1267ND shares identical pinout and package (360-ball HCTE) with MPC7447A, enabling direct PCB reuse. However, BVSEL[1:0] configuration differs for 1.8 V mode, and DFS functionality requires updated power sequencing - so firmware and power supply design must be validated before substitution.

How does the L2 cache ECC implementation function in KMC7448VU1267ND?

KMC7448VU1267ND implements 64-bit ECC on its 1-Mbyte L2 data array, detecting and correcting all single-bit errors and detecting multi-bit errors. ECC is enabled by default and cannot be disabled; error injection capability allows validation of recovery routines during system bring-up and safety certification.

What bus protocols does KMC7448VU1267ND support, and are they software-configurable?

KMC7448VU1267ND implements the MPX bus protocol for main memory and system resource access, with partial backward compatibility to the 60x bus protocol. Protocol selection is hardware-defined by the bus controller logic and not runtime configurable - MPX is mandatory for full feature support including snoop coherency and out-of-order transactions.

Is JTAG debugging supported on KMC7448VU1267ND, and what standards compliance does it meet?

Yes, KMC7448VU1267ND includes full IEEE Std. 1149.1 JTAG boundary-scan support via dedicated TCK/TMS/TDI/TDO/TRST pins. It enables in-circuit emulation, structural testing, and flash programming without halting CPU execution - critical for field firmware updates and production test of deployed KMC7448VU1267ND systems.