NXP Semiconductors XPC850DECVR50BU

Overview

XPC850DECVR50BU 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 CPM-based offload architecture - deployed in remote-access gateways, DSL/CPE equipment, and cost-sensitive telecom edge devices.

For engineers reviewing the XPC850DECVR50BU datasheet, XPC850DECVR50BU pinout, XPC850DECVR50BU application, or XPC850DECVR50BU equivalent, key selection criteria include its 50 MHz core clock rating, BGA-352 package, IEEE 802.3-compliant SCCs, USB 1.1 transceiver integration, and dual-voltage operation (3.3 V core/I/O with 5-V-tolerant GPIO).

Technical Context

The XPC850DECVR50BU implements a Harvard-architecture embedded MPC8xx core with 2-Kbyte instruction cache and 1-Kbyte data cache, MMU with 8-entry TLBs, and branch prediction without conditional execution. Its Communications Processor Module (CPM) contains a dedicated 32-bit RISC CP, 8-Kbyte dual-port RAM, and 20 SDMA channels for serial peripherals.

It supports up to seven serial interfaces: two SCCs (Ethernet/HDLC/PPP/UART), one USB channel, two SMCs, one I²C port, and one SPI - all managed independently by the CPM to relieve the main core. The time slot assigner enables TDM multiplexing across SCCs and SMCs for ISDN, PCM, and CEPT applications.

Key Specifications

Pinout & Package

Package: 352-ball plastic ball grid array (PBGA), 27 mm × 27 mm, 1.27 mm pitch, RoHS-compliant. Thermal pad on underside requires solder paste stencil aperture and ground-plane connection per Freescale layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC850SR and MPC850DSL, XPC850DECVR50BU delivers optimal cost-performance balance for Ethernet/HDLC/USB gateway applications without ATM or >50 MHz requirements - avoiding over-specification while maintaining full software compatibility within the MPC850 family.

Availability

XPC850DECVR50BU is available at Aetrix Electronics and suitable for DSL customer premises equipment, remote access servers, and industrial protocol gateways requiring stable component supply across extended product lifecycles.

Supply support for XPC850DECVR50BU 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) pioneered PowerQUICC™ communications processors for embedded networking, emphasizing hardware-accelerated protocol offload and real-time determinism.

The MPC850 family - including XPC850DECVR50BU - was designed specifically for cost-sensitive, low-power telecom edge devices requiring integrated Ethernet, HDLC, and USB connectivity without external co-processors.

FAQ

What is the maximum operating frequency of the XPC850DECVR50BU core?

The XPC850DECVR50BU is rated for a maximum core clock frequency of 50 MHz. This specification is validated under 3.135–3.465 V supply conditions at junction temperatures up to 95°C. Operation beyond 50 MHz violates the device's AC timing guarantees and may cause bus protocol violations or CPM microcode execution errors. The XPC850DECVR50BU does not support overclocking or factory binning above this rating.

Does the XPC850DECVR50BU support USB host mode?

Yes, the XPC850DECVR50BU integrates a full-speed USB 1.1 controller supporting both host and peripheral modes at 12 Mbps, plus low-speed mode at 1.5 Mbps. Its USB transceiver uses dedicated differential pins (USBTXP/USBTXN/USBRXP/USBRXN) and requires external 1.5-kΩ pull-up resistors on D+ or D− to signal speed negotiation. The CPM handles USB protocol stack offload, reducing host CPU overhead.

What package type and pin count does the XPC850DECVR50BU use?

The XPC850DECVR50BU uses a 352-ball plastic ball grid array (PBGA) package measuring 27 mm × 27 mm with 1.27 mm pitch. It is RoHS-compliant and features an exposed thermal pad on the underside requiring solder connection to a PCB ground plane. Pin compatibility is maintained across the MPC850 family, including MPC850DE, MPC850SR, and MPC850DSL variants.

How does the Communications Processor Module (CPM) reduce CPU load in the XPC850DECVR50BU?

The CPM in the XPC850DECVR50BU contains a dedicated 32-bit RISC processor that autonomously handles serial protocol framing, CRC generation, HDLC flag detection, USB endpoint management, and DMA transfers - all without main core intervention. This offloads >60% of packet-processing tasks in concurrent multi-protocol scenarios, allowing the MPC8xx core to focus on application-layer functions like routing tables or VoIP signaling.

Is the XPC850DECVR50BU pin-compatible with other MPC850 family members?

Yes, the XPC850DECVR50BU shares identical BGA-352 pinout and electrical characteristics with MPC850DE, MPC850SR, and MPC850DSL. All variants use the same ball map, voltage domains, and timing specifications - enabling drop-in replacement where functional requirements (e.g., UTOPIA, ATM, or 66 MHz clock) align. Software is binary-compatible across the family via standard MPC850 initialization code.