NXP Semiconductors MPC857DSLVR50B

Overview

MPC857DSLVR50B from Freescale Semiconductor is a PowerQUICC™ family integrated communications microprocessor featuring a 32-bit MPC8xx PowerPC core, 4-Kbyte instruction and 4-Kbyte data cache, single Fast Ethernet controller (FEC) with MII/UTOPIA support, one SCC (SCC1) dedicated to Ethernet, and one SMC (SMC1) configured for UART operation. It operates at 50 MHz in 1:1 CPU-to-bus mode and targets DSL access concentrators and ATM edge equipment.

For engineers reviewing the MPC857DSLVR50B datasheet, MPC857DSLVR50B pinout, MPC857DSLVR50B application, or MPC857DSLVR50B equivalent, this page delivers verified functional identity, confirmed package mapping (357-pin PBGA), validated cache and peripheral configuration, thermal and DC electrical specs per Rev. 3 hardware specification, and real-world selection guidance for legacy telecom infrastructure design.

Technical Context

The MPC857DSLVR50B implements a dual-module architecture: an MPC8xx core handling general-purpose processing and a Communications Processor Module (CPM) executing offloaded serial protocols. Its CPM includes 10 SDMA channels, 8-Kbyte dual-port RAM, and RISC-based command execution for HDLC, UART, and ATM SAR functions.

It supports enhanced SAR (ESAR) mode with OAM/PM monitoring, ATM port-to-port switching without microcode, UTOPIA Level 2 compliance with FIFO buffering, and simultaneous MII (10/100Base-T) and half-duplex UTOPIA operation - all confirmed for the MPC857DSL variant per Table 1 and Figure 2 of MPC862EC Rev. 3.

Key Specifications

Pinout & Package

357-pin plastic ball grid array (PBGA) package with 32-bit data bus, 32 address lines, and dedicated power/ground ball assignments per mechanical drawing in Section 14 of MPC862EC Rev. 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC857T, MPC857DSLVR50B offers identical functionality and pinout but with explicit industrial temperature qualification and tape-and-reel packaging; versus MPC862T, it trades peripheral richness for lower cost, reduced power, and smaller PCB area - making it optimal for single-line DSL access nodes.

Availability

MPC857DSLVR50B is available at Aetrix Electronics and suitable for DSL access concentrators, ATM edge multiplexers, residential gateways, and legacy telecom node replacements requiring stable component supply across extended product lifecycles.

Supply support for MPC857DSLVR50B 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 was a leading designer of embedded processors and analog devices, later acquired by NXP Semiconductors in 2015. It pioneered the PowerQUICC™ family for communications infrastructure.

The MPC857DSLVR50B belongs to the MPC862/857T/857DSL PowerQUICC™ family, engineered specifically for cost-sensitive, low-power ATM and DSL edge applications requiring integrated Ethernet, UTOPIA, and ESAR functionality.

FAQ

What is the maximum operating frequency of the MPC857DSLVR50B?

The MPC857DSLVR50B is rated for operation up to 100 MHz in 2:1 CPU-to-bus mode (e.g., 100 MHz core with 50 MHz bus). In 1:1 mode, its maximum supported frequency is 66 MHz. The MPC857DSLVR50B part number specifically denotes the 50 MHz version, confirmed in Table 4 of MPC862EC Rev. 3 under "Die Revision A.1, B.0 (1:1 Mode) 50 MHz".

Does the MPC857DSLVR50B support UTOPIA Level 2?

Yes, the MPC857DSLVR50B supports UTOPIA Level 2 with added FIFO buffering to reduce total cell transmission time, as explicitly stated in Section 2 of MPC862EC Rev. 3. It also maintains backward compatibility with UTOPIA Level 1, enabling interoperability with legacy ATM PHY devices.

How many serial communication controllers (SCCs) does the MPC857DSLVR50B include?

The MPC857DSLVR50B includes exactly one serial communication controller (SCC1), which is dedicated to Ethernet functionality. This is confirmed in Table 1 and Figure 2 of MPC862EC Rev. 3, which state "On the MPC857DSL, the SCC (SCC1) is for ethernet only" and omit SCC2–SCC4 entirely.

Is the Time Slot Assigner (TSA) available on the MPC857DSLVR50B?

No, the MPC857DSLVR50B does not include a Time Slot Assigner (TSA). Section 2 and Figure 2 of MPC862EC Rev. 3 explicitly state "The MPC857DSL does not support the Time Slot Assigner (TSA)" and show TSA logic absent from the MPC857DSL block diagram.

What package type is used for the MPC857DSLVR50B?

The MPC857DSLVR50B uses a 357-pin plastic ball grid array (PBGA) package, as specified in Section 6 ("Features") and Section 14 ("Mechanical Data and Ordering Information") of MPC862EC Rev. 3. This package supports standard surface-mount assembly and meets JEDEC MO-205 standards.