NXP Semiconductors MC860ENCZQ50D4R2

Overview

MC860ENCZQ50D4R2 from Freescale Semiconductor is a PowerQUICC™ integrated communications controller combining a 32-bit Power Architecture™ CPU core, Communications Processor Module (CPM), 4 KB instruction/4 KB data cache, 10/100 Mbps Ethernet MAC, four Serial Communications Controllers (SCCs), and UTOPIA ATM interface - designed for embedded networking gateways, DSLAMs, and industrial protocol converters operating at up to 50 MHz system clock.

For engineers reviewing the MC860ENCZQ50D4R2 datasheet, MC860ENCZQ50D4R2 pinout, MC860ENCZQ50D4R2 application, or MC860ENCZQ50D4R2 equivalent, this page delivers verified technical context, package mapping to PBGA-357 (ZQ), thermal resistance values (RθJA = 34°C/W), IEEE 802.3u compliance, and validated alternative parts for migration planning in legacy PowerQUICC-based designs.

Technical Context

The MC860ENCZQ50D4R2 implements a dual-bus architecture: a 32-bit CPU bus running at up to 50 MHz (1:1 mode) and a separate CPM bus supporting concurrent HDLC, UART, SPI, I²C, and FEC operations. Its CPM includes 8 KB dual-port RAM, 16 SDMA channels, and four BRGs enabling independent baud-rate generation for all serial peripherals.

It integrates a memory controller with eight programmable banks, dynamic DRAM/SRAM/Flash support, and boot-selectable 8/16/32-bit interface; the SIU provides real-time clock, watchdog, PIT, JTAG debug, and clock synthesizer - all operating from a single 3.3 V supply with 5 V-tolerant I/O (except EXTAL/EXTCLK).

Key Specifications

Pinout & Package

MC860ENCZQ50D4R2 is housed in a 357-pin plastic ball grid array (PBGA) package with ZQ designation (Case No. 5058, 25×25×1.2 mm, 1.27 mm pitch), requiring controlled-impedance routing, ground-plane coupling, and strict decoupling (≥4 × 0.1 µF caps near package edges).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC860ENCZQ50D4R2, MPC860PZP50D4 offers higher cache bandwidth for complex protocol stacks but demands mechanical redesign, while MPC855TZQ50D4 sacrifices ATM capability for enhanced Ethernet throughput - making MC860ENCZQ50D4R2 uniquely balanced for hybrid ATM/Ethernet edge infrastructure.

Availability

MC860ENCZQ50D4R2 is available at Aetrix Electronics and suitable for DSLAM line cards, industrial protocol gateways, telecom edge routers, and secure RTUs requiring stable component supply across extended product lifecycles.

Supply support for MC860ENCZQ50D4R2 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 since 2015) was a pioneer in embedded communications processors, delivering high-integration SoCs for networking, automotive, and industrial markets.

The MPC860 PowerQUICC family was engineered to unify CPU, CPM, and peripheral logic for carrier-grade and enterprise-edge equipment - targeting applications demanding concurrent protocol processing, real-time determinism, and long-term obsolescence resilience.

FAQ

What is the maximum supported bus frequency for MC860ENCZQ50D4R2?

The MC860ENCZQ50D4R2 supports a maximum bus frequency of 50 MHz in 1:1 mode (CPU = bus). When operated at 66 MHz CPU speed, it must use 2:1 mode (33 MHz bus). This constraint is enforced by internal clock dividers and affects memory controller timing margins - exceeding 50 MHz bus in 1:1 mode violates AC specifications in Table 7 of the hardware spec.

Does MC860ENCZQ50D4R2 include an integrated Ethernet PHY?

No, MC860ENCZQ50D4R2 integrates only the 10/100 Mbps Ethernet MAC layer (via SCCs). An external PHY (e.g., DP83848) is required for physical layer signaling. The device provides MII interface signals (TXD/RXD, TX_EN, CRS, COL) and supports both 7-wire and 4-wire MII configurations depending on PHY selection.

What package type and thermal characteristics apply to MC860ENCZQ50D4R2?

MC860ENCZQ50D4R2 uses the ZQ package: PBGA-357 (25×25 mm, 1.27 mm pitch, 1.2 mm height). Its thermal resistance is RθJA = 34°C/W (natural convection, single-layer board) and RθJB = 13°C/W. These values assume proper PCB layout with thermal vias to inner ground plane and ≥4 × 0.1 µF bypass capacitors placed within 5 mm of each VDD pin group.

Can MC860ENCZQ50D4R2 operate with a 5 V input signal on its I/O pins?

Yes, most I/O pins tolerate 5 V inputs (VIH up to 5.5 V), but with critical restriction: input voltage must not exceed VDDH + 2.5 V. Since MC860ENCZQ50D4R2 operates at 3.3 V, 5 V inputs are allowed only if VDDH ≥ 2.5 V - which holds during normal operation. However, during power-up/power-down sequences, VDDH may dip below 2.5 V, risking latch-up; thus, level-shifting is recommended for robustness.

Is JTAG debugging supported on MC860ENCZQ50D4R2, and what are the key requirements?

Yes, MC860ENCZQ50D4R2 fully supports IEEE 1149.1 JTAG boundary-scan and on-chip emulation. Required pins are TMS, TCK, TDI, TDO, TRST, and TDO. Key design requirements include 10 kΩ pull-up on TMS, 100 Ω series resistor on TCK, and routing TCK/TMS/TDI/TDO as controlled-impedance nets (50 Ω) away from noisy clocks or switching supplies to avoid false triggers during debug sessions.