NXP Semiconductors MPC850DSLVR50BU

Overview

MPC850DSLVR50BU from Freescale Semiconductor is a PowerQUICC™ integrated communications processor featuring a 32-bit MPC8xx core, dual-port RAM (8 KB), two serial communications controllers (SCCs) with Ethernet/IEEE 802.3 support, USB 1.1 host/slave controller, and a dedicated RISC communications processor (CP). It targets cost-sensitive remote-access and telecommunications equipment requiring deterministic serial protocol handling and embedded control.

For engineers reviewing the MPC850DSLVR50BU datasheet, MPC850DSLVR50BU pinout, MPC850DSLVR50BU application, or MPC850DSLVR50BU equivalent, key selection criteria include its 50 MHz core frequency, BGA-352 package, dual SCCs with ATM support, USB 1.1 capability, and PCMCIA-ATA interface - all critical for legacy telecom gateway and DSL access multiplexer designs.

Technical Context

The MPC850DSLVR50BU implements a Harvard-architecture embedded MPC8xx core with 2-Kbyte instruction cache and 1-Kbyte data cache, MMU with 8-entry TLBs, and full IEEE 1149.1 JTAG debug support. Its CPM integrates a separate 32-bit RISC communications processor managing up to seven serial channels including two SCCs, one USB, two SMCs, one I²C, and one SPI - offloading protocol processing from the main core.

It supports dynamic bus sizing (8/16/32-bit), big- and little-endian memory systems, and low-power modes (Doze, Sleep, Deep Sleep). The memory controller supports DRAM, SDRAM, SRAM, EPROM, and flash across eight banks, with boot chip-select configurable for 8-, 16-, or 32-bit interfaces and variable block sizes from 32 Kbytes to 256 Mbytes.

Key Specifications

Pinout & Package

Package: 352-ball plastic ball grid array (PBGA), 27 mm × 27 mm, 1.27 mm pitch, RoHS-compliant. Thermal resistance θ_JA = 24°C/W with multilayer board and thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC850SRVR50BU, MPC850DSLVR50BU omits UTOPIA but retains dual SCCs and ATM protocol acceleration - making it optimal for DSLAM line cards. Against MPC852TVR50BU, it delivers higher serial channel density and protocol flexibility at modest cost premium, justifying use in multi-service access nodes.

Availability

MPC850DSLVR50BU is available at Aetrix Electronics and suitable for DSL access multiplexers, remote access servers, telecom gateways, and industrial protocol converters requiring stable component supply across long-lifecycle deployments.

Supply support for MPC850DSLVR50BU 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 processors, analog, and connectivity solutions for automotive, industrial, and networking markets.

The MPC850 family was designed as cost-optimized PowerQUICC™ communications processors targeting remote-access, DSL, and enterprise edge networking equipment - emphasizing integration of protocol engines, memory controllers, and I/O interfaces on a single die.

FAQ

What is the maximum operating frequency of the MPC850DSLVR50BU?

The MPC850DSLVR50BU operates at a maximum core frequency of 50 MHz, as indicated by the "R50" suffix in the part number. This frequency is validated across the extended temperature range (−40°C to +95°C) and requires supply voltage between 3.135 V and 3.465 V. Bus operation must be configured in half-speed mode when using higher-frequency clock sources - for example, a 66-MHz system clock yields a 33-MHz bus interface.

Does the MPC850DSLVR50BU support USB 2.0?

No, the MPC850DSLVR50BU integrates a USB 1.1 controller supporting only full-speed (12 Mbps) and low-speed (1.5 Mbps) modes. It does not implement USB 2.0 high-speed (480 Mbps) functionality or the associated PHY layer enhancements. USB 1.1 capability is sufficient for host-side diagnostics, firmware updates via USB storage devices, and basic peripheral attachment in legacy telecom platforms.

How many serial communications controllers (SCCs) does the MPC850DSLVR50BU include?

The MPC850DSLVR50BU includes two serial communications controllers (SCCs), as confirmed by the MPC850 family functionality matrix and hardware specifications. Both SCCs support Ethernet/IEEE 802.3, HDLC/SDLC, ATM, and transparent bit-stream modes - enabling concurrent DSL framing and Ethernet backhaul in access equipment.

What package type is used for the MPC850DSLVR50BU?

The MPC850DSLVR50BU uses a 352-ball plastic ball grid array (PBGA) package measuring 27 mm × 27 mm with 1.27 mm ball pitch. This package is thermally optimized with a θ_JA of 24°C/W when implemented on a multilayer PCB with thermal vias, and requires strict adherence to Freescale's layout guidelines - including four 0.1 µF bypass capacitors near VDDH/VDDL pins and controlled-impedance routing for USB and Ethernet signals.

Is the MPC850DSLVR50BU pin-compatible with other MPC850 family members?

The MPC850DSLVR50BU shares the same BGA-352 footprint and core signal mapping with other MPC850 variants (e.g., MPC850SRVR50BU, MPC850DEVR50BU), but pin functions differ for peripheral-specific signals such as UTOPIA (present on SR variant) or additional PCMCIA controls. While mechanical mounting is identical, PCB redesign is required when substituting across variants due to functional pin reassignments - especially for SCC, USB, and memory controller strobe signals.