NXP Semiconductors MPC850DSLCZQ50BU

Overview

MPC850DSLCZQ50BU from NXP Semiconductors (formerly Freescale) is a PowerQUICC™ integrated communications processor combining a 32-bit MPC8xx core with a dedicated RISC communications processor (CP), dual-port RAM, memory controller, and CPM supporting two SCCs, USB, two SMCs, I²C, SPI, and TDM time-slot assigner. It operates at 50 MHz, supports 10-Mbps Ethernet, HDLC/SDLC, and ATM (DSL variant), and targets DSL access multiplexers and remote telecom gateways.

For engineers reviewing the MPC850DSLCZQ50BU datasheet, MPC850DSLCZQ50BU pinout, MPC850DSLCZQ50BU application, or MPC850DSLCZQ50BU equivalent, key selection criteria include its dual-SCC Ethernet/ATM capability, 8-Kbyte dual-port RAM allocation for CPM offload, 3.3-V operation with 5-V-tolerant I/O, BGA-352 package thermal resistance (θ_JA = 31°C/W), and support for PCMCIA-ATA host interface in cost-sensitive DSL infrastructure.

Technical Context

The MPC850DSLCZQ50BU implements a Harvard-architecture MPC8xx core (2-Kbyte I-cache, 1-Kbyte D-cache, MMU with 8-entry TLB) alongside a separate 32-bit RISC communications processor (CP) executing protocol-specific microcode for serial channel management. Its CPM integrates 20 SDMA channels, four baud-rate generators, and a time-slot assigner enabling T1/CEPT/ISDN multiplexing.

It features a glueless memory controller supporting DRAM, SDRAM, SRAM, and flash across eight banks; IEEE 1149.1 JTAG debug interface with eight comparators; and low-power modes including Doze, Sleep, and Deep Sleep-retaining RTC and periodic timer functionality while disabling core units to reduce dynamic power.

Key Specifications

Pinout & Package

Package: 352-ball plastic ball grid array (PBGA), 27 mm × 27 mm, 1.27 mm pitch, RoHS-compliant. Ball map follows Freescale MPC850 Family Mechanical Data (Document Number: MPC850EC, Rev. 2, p. 63).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC850SRZQ50B and MPC860PZQ50B, the MPC850DSLCZQ50BU delivers optimal balance of DSL-specific peripheral integration, 8-Kbyte dual-port RAM for CPM offload, and PCMCIA-ATA host capability-making it the most cost-effective and layout-efficient choice for single-board DSL access concentrators.

Availability

MPC850DSLCZQ50BU is available at Aetrix Electronics and suitable for DSL access multiplexers, remote terminal units, telecom gateway controllers, and embedded network management modules requiring stable component supply across extended product lifecycles.

Supply support for MPC850DSLCZQ50BU 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 (formerly Freescale Semiconductor) is a global leader in secure connectivity solutions for automotive, industrial, and communication infrastructure markets.

The MPC850 family was designed specifically for cost-sensitive, remote-access telecommunications equipment-integrating communications acceleration, memory control, and system management into a single chip to replace multi-chip controller designs in DSLAMs and access gateways.

FAQ

What is the maximum operating frequency of the MPC850DSLCZQ50BU?

The MPC850DSLCZQ50BU is rated for 50 MHz core operation. Its bus interface supports up to 50 MHz in full-speed mode; higher-frequency variants (e.g., 66 MHz) require half-speed bus configuration (33 MHz). The device's DC electrical specifications mandate 3.135–3.465 V supply voltage at this frequency to ensure timing compliance and signal integrity across all I/O domains.

Does the MPC850DSLCZQ50BU support both Ethernet and ATM protocols simultaneously?

Yes, the MPC850DSLCZQ50BU supports concurrent Ethernet (IEEE 802.3, 10 Mbps) and ATM (via SCC2 in UTOPIA-compatible mode) through its two serial communications controllers. The CPM's protocol-specific microcode enables independent frame handling-allowing the first SCC to manage DSL management traffic over Ethernet while the second processes ATM cells for broadband data transport without CPU intervention.

What package type and thermal characteristics apply to the MPC850DSLCZQ50BU?

The MPC850DSLCZQ50BU uses a 352-ball PBGA package (27 mm × 27 mm, 1.27 mm pitch). Its thermal resistance is θ_JA = 31°C/W under natural convection on a multilayer board with thermal vias and 1 W dissipation. This value assumes a 20°C board-to-ambient rise and dictates heatsink requirements for continuous operation in sealed DSLAM enclosures.

How much dual-port RAM does the MPC850DSLCZQ50BU integrate, and how is it allocated?

The MPC850DSLCZQ50BU integrates 8 Kbytes of on-chip dual-port RAM, exclusively allocated to the Communications Processor Module (CPM). This RAM is accessible concurrently by the MPC8xx core and the RISC CP for descriptor tables, receive/transmit buffers, and protocol state variables-enabling zero-copy data movement and eliminating CPU polling overhead in high-throughput DSL line cards.

Is the MPC850DSLCZQ50BU pin-compatible with other MPC850 family members like the MPC850DE or MPC850SR?

No, the MPC850DSLCZQ50BU is not pin-compatible with MPC850DE or MPC850SR. While all share the same BGA-352 footprint, ball assignments differ significantly-for example, MPC850DSLCZQ50BU dedicates PB[25]/PB[24] to SMTXD1/SMRXD1 for G.Lite modem interfacing, whereas MPC850SR assigns those balls to UTOPIA signals. PCB layout must be specific to MPC850DSLCZQ50BU's mechanical data sheet.