MPC860PCZQ50D4
MPC860PCZQ50D4 - PowerQUICC MPC860 50MHz MPU | 357-PBGA | NXP
The NXP MPC860PCZQ50D4 is a PowerQUICC MPC8xx microprocessor in a 357-ball PBGA (25x25 mm) package, integrating a 32-bit 50 MHz PowerPC core with a CPM (Communications Processor Module), peripheral controllers, and memory management on a single die. The PC suffix indicates an industrial temperature grade, the ZQ suffix denotes the PBGA-357 package without lead-free requirement, the 50 indicates the 50 MHz core frequency, and D4 is the silicon revision. Marked End of Life by NXP, the part remains widely used in long-lifecycle networking equipment, telecom control boards, and legacy embedded designs.
What is a PowerQUICC processor? The PowerQUICC architecture is a family of integrated communications microprocessors that combine a PowerPC CPU core with a separate RISC-based Communications Processor Module (CPM) on one chip. The CPM offloads DMA, serial protocols, and time-division multiplexing from the CPU, making PowerQUICC devices suited to routers, DSLAMs, frame-relay controllers, and SCADA terminals. The MPC860 was one of Freescale's (now NXP) most widely deployed PowerQUICC I variants.
Key features of the MPC860PCZQ50D4 include a 32-bit PowerPC 603 core without FPU, 4 Kbyte instruction and data caches, on-chip MMU supporting 32-bit virtual addressing, dual 10/100 Mbps Ethernet MACs with MII interfaces, and a CPM that handles HDLC, UART, SCC, SPI, I2C, and parallel interfaces. The integrated system interface includes DRAM controller, PCMCIA controller, and JTAG boundary-scan test. Operating power is 3.3 V for I/O and 1.8 V or 2.2 V internal core supply, typically at approximately 4 W active dissipation.
Architecture depth: The MPC860 integrates the PowerPC core, CPM, and an SIU (System Interface Unit) on a 0.32 micron CMOS process. The CPM RISC engine runs independently from the core, executing microcode-driven protocol handling. This dual-engine partition enables sustained serial throughput even while the CPU executes RTOS or protocol-stack tasks, which is why PowerQUICC parts were historically chosen for WAN access concentrators and ISDN PRI gateway designs.
Typical applications include branch-office routers, integrated access devices, LAN-to-WAN bridges, telecom control-plane boards, industrial protocol gateways, and legacy 3G basestation controllers. Designers also use it in serial-backhaul modems, ATM edge switches, and avionics communication buses. Where to buy MPC860PCZQ50D4 today: authorized stock remains at Avnet, Rochester Electronics (franchised for EOL NXP parts), and select legacy distributors, with pricing reflecting remaining inventory rather than volume production.
Design considerations include a 357-ball fine-pitch BGA that requires 4-6 layer controlled-impedance PCB design, careful thermal dissipation through center balls and inner copper pours, supply sequencing of 3.3 V and core voltage rails, and provision for JTAG boundary-scan debugging. Replacement part option from the same family (pin-compatible) is the MPC860TCVR50D4 and MPC860ENCVR50D4 noted in our alternatives, depending on cache and peripheral mix.
This page synthesizes current distributor pricing, drop-in same-family PowerQUICC alternatives, and practical design notes for legacy system maintenance, content not duplicated on DigiKey or Mouser product pages.
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