NXP Semiconductors MPC860SRZQ50D4

Overview

MPC860SRZQ50D4 from NXP (formerly Freescale) is a PowerQUICC™ integrated communications controller combining a 32-bit Power Architecture™ CPU core and a RISC-based Communications Processor Module (CPM). It features 4 KB instruction/4 KB data cache, 4 serial communications controllers (SCCs), 10/100 Mbps Ethernet support, ATM interface via UTOPIA, and operates at up to 50 MHz. It targets embedded networking gateways, industrial protocol converters, and telecom edge devices requiring deterministic real-time packet processing.

For engineers reviewing the MPC860SRZQ50D4 datasheet, MPC860SRZQ50D4 pinout, MPC860SRZQ50D4 application, or MPC860SRZQ50D4 equivalent, key selection considerations include its 357-pin PBGA package, dual-voltage 3.3 V core/I/O operation with 5 V-tolerant inputs, IEEE 802.3u-compliant Ethernet MAC, UTOPIA Level 1 ATM interface, and CPM-based offload for HDLC, UART, and synchronous serial protocols - all critical for legacy telecom infrastructure upgrades.

Technical Context

The MPC860SRZQ50D4 implements a split-architecture design: a 32-bit Power Architecture CPU core with MMU, instruction/data caches, and memory management unit handles general-purpose tasks and OS execution, while the dedicated CPM executes time-critical communication protocols-including HDLC, UART, and ATM cell processing-without CPU intervention. Its bus interface supports dynamic 8/16/32-bit data width and up to 66 MHz bus clock (with 50 MHz core frequency).

It integrates a system integration unit (SIU) with real-time clock, watchdog timer, JTAG debug interface, and clock synthesizer; memory controller supporting DRAM, SRAM, Flash, and PCMCIA; and peripheral interfaces including I²C, SPI, TSA, and four BRGs. The "SR" variant specifically enables up to four SCCs and UTOPIA-based ATM support, distinguishing it from Ethernet-only or ATM-disabled variants.

Key Specifications

Pinout & Package

Package: 357-ball Plastic Ball Grid Array (PBGA), ZQ designation (Case No. 5058, 1103D-02), 25 mm × 25 mm body, 1.2 mm height, 1.27 mm ball pitch. Thermal pad on underside requires solder connection to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated communications controller applications.

Compared with MPC860T, MPC860SRZQ50D4 offers identical functional capability and drop-in compatibility, whereas MPC855T lacks UTOPIA and three SCCs - making it unsuitable for ATM aggregation or multi-protocol serial gateways without architectural redesign.

Availability

MPC860SRZQ50D4 is available at Aetrix Electronics and suitable for DSLAM line cards, industrial protocol gateways, legacy telecom switch nodes, and secure RTUs requiring stable component supply across extended product lifecycles.

Supply support for MPC860SRZQ50D4 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with roots in Freescale's embedded processor heritage.

The MPC860 PowerQUICC family was designed specifically for communications infrastructure requiring hardware-accelerated protocol offload, deterministic real-time response, and long-term industrial qualification - targeting telecom access equipment and mission-critical control systems.

FAQ

What is the maximum operating frequency of the MPC860SRZQ50D4?

The MPC860SRZQ50D4 operates at a maximum core frequency of 50 MHz, as indicated by the "50" in its part number suffix. Its bus interface supports up to 66 MHz, but when running at 50 MHz core speed, the bus is typically configured in 1:1 mode. This frequency enables reliable execution of real-time communication stacks including HDLC, PPP, and ATM cell processing within the CPM without CPU intervention. The MPC860SRZQ50D4 must be powered at 3.135–3.465 V to sustain 50 MHz operation.

Does the MPC860SRZQ50D4 support IEEE 802.3u 100 Mbps Ethernet?

Yes, the MPC860SRZQ50D4 includes a fully compliant IEEE 802.3u 10/100 Mbps Ethernet MAC implemented in its communications processor module (CPM). It supports MII interface signaling and full-duplex operation. However, it does not integrate a physical layer transceiver - an external PHY (e.g., DP83848) must be connected via MII pins (MII_TXD[0:3], MII_RXD[0:3], MII_MDC, MII_MDIO). The MPC860SRZQ50D4's Ethernet capability is enabled on SCC1–SCC4 and requires proper initialization of the FEC registers.

What package type and pin count does the MPC860SRZQ50D4 use?

The MPC860SRZQ50D4 uses a 357-ball Plastic Ball Grid Array (PBGA) package with ZQ designation (Case No. 5058, 1103D-02), measuring 25 mm × 25 mm with 1.27 mm ball pitch and 1.2 mm height. This package includes an exposed thermal pad on the underside that must be soldered to a PCB ground plane for thermal compliance. Pin functions are defined in the MPC860 Hardware Specifications Rev. 10, and the ZQ package shares mechanical and thermal characteristics with other MPC860 variants like MPC860T and MPC860P.

Can the MPC860SRZQ50D4 operate with 5 V-tolerant I/Os?

Yes, most I/O pins on the MPC860SRZQ50D4 are 5 V-tolerant when powered at 3.3 V, including address, data, and control signals such as TS, TA, TEA, BI, and BB. However, inputs EXTAL and EXTCLK have stricter voltage limits: VIHC = 0.7 × VDDH to VDDH + 0.3 V. Also, no input may exceed VDDH + 2.5 V under any condition - this applies during power-up sequencing and normal operation. Unused inputs must be pulled to VDD or GND to prevent floating states.

What debugging interfaces are available on the MPC860SRZQ50D4?

The MPC860SRZQ50D4 provides IEEE 1149.1 (JTAG) boundary-scan test access port for silicon validation and board-level testing, plus an advanced on-chip emulation (OCE) debug mode with eight hardware watchpoint comparators - four for instruction address, two for data address, and two for data value matching. These allow non-intrusive breakpoints, memory access tracing, and real-time register inspection without halting the CPU or CPM, which is essential for validating time-critical communication stacks in the MPC860SRZQ50D4.