NXP Semiconductors XPC850DSLZT50BU

Overview

XPC850DSLZT50BU from Freescale Semiconductor is a PowerQUICC™ integrated communications processor featuring a 32-bit MPC8xx core, dual serial communications controllers (SCCs), ATM and Ethernet support, USB 1.1 host/slave interface, and 8-Kbyte dual-port RAM - designed for cost-sensitive DSL access multiplexers and remote telecom gateways operating at up to 50 MHz.

For engineers reviewing the XPC850DSLZT50BU datasheet, XPC850DSLZT50BU pinout, XPC850DSLZT50BU application, or XPC850DSLZT50BU equivalent, key selection criteria include its dual-SCC Ethernet/ATM capability, 3.3-V I/O with 5-V tolerance, BGA-352 package, CPM-based offload architecture, and support for PCMCIA-ATA and TDM time-slot assignment in embedded networking systems.

Technical Context

The XPC850DSLZT50BU implements a Harvard-architecture RISC communications processor (CP) alongside the main MPC8xx core, enabling concurrent protocol processing - including HDLC, PPP, transparent serial, and ATM over two SCCs. Its CPM includes 20 SDMA channels and 8-Kbyte dual-port RAM for autonomous frame handling without CPU intervention.

It supports dynamic bus sizing (8/16/32-bit), multiple memory types (SDRAM, SRAM, Flash), and IEEE 1149.1 JTAG debug. The device operates at 3.3 V with 5-V-tolerant I/O pins, uses a 26-bit external address bus, and features four independent baud-rate generators shared across SCCs, SMCs, and USB.

Key Specifications

Pinout & Package

Package: 352-ball plastic ball grid array (PBGA), 19 mm × 19 mm, 1.27-mm ball pitch, bottom-side thermal pad. Pinout validated per Freescale MPC850 Hardware Specifications Rev. 2 (Document No. MPC850EC), Table 6 and Figure 1 block diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC850SRZT50B and MPC850DEZT50B, the XPC850DSLZT50BU uniquely balances ATM-enabled DSL aggregation, USB host capability, and PCMCIA-ATA integration - making it the optimal choice for cost-constrained, multi-service access platforms requiring both Ethernet and ATM protocol acceleration.

Availability

XPC850DSLZT50BU is available at Aetrix Electronics and suitable for DSL access multiplexers, remote telecom gateways, industrial protocol converters, and legacy network bridges requiring stable component supply and long-term industrial-grade availability.

Supply support for XPC850DSLZT50BU 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 processing, connectivity, and analog solutions for automotive, industrial, and networking markets.

The MPC850 family was designed as cost-optimized PowerQUICC™ communications processors targeting remote-access, DSL, and telecommunications infrastructure - emphasizing CPM offload, multi-protocol serial support, and glueless memory interfacing.

FAQ

What is the maximum operating frequency of the XPC850DSLZT50BU?

The XPC850DSLZT50BU operates at a maximum core frequency of 50 MHz. Its bus interface supports up to 50 MHz in full-speed mode; higher frequencies require half-speed bus configuration (e.g., 66-MHz core clock with 33-MHz bus). This limitation is defined in Freescale's MPC850 Hardware Specifications Rev. 2, Section 6.

Does the XPC850DSLZT50BU support ATM protocol processing?

Yes, the XPC850DSLZT50BU explicitly supports ATM protocol processing via its dual SCCs, as confirmed in Table 1 of the MPC850 Hardware Specifications (Rev. 2). It implements ATM cell segmentation and reassembly in hardware using CPM microcode, distinguishing it from non-DSL variants like MPC850DE.

What package type and pin count does the XPC850DSLZT50BU use?

The XPC850DSLZT50BU uses a 352-ball plastic ball grid array (PBGA) package with 1.27-mm pitch and 19 mm × 19 mm footprint. Pinout and mechanical data are specified in Section 9 ("Mechanical Data and Ordering Information") of the MPC850EC document, Revision 2.

Is the XPC850DSLZT50BU pin-compatible with other MPC850 family members?

Yes, the XPC850DSLZT50BU shares identical pinout and package with MPC850SRZT50B, MPC850DEZT50B, and MPC850ZT50B per Freescale's MPC850 Functionality Matrix and mechanical drawings. This enables hardware reuse across DSL, ATM-switch, and Ethernet-only variants within the same PCB design.

What power supply requirements does the XPC850DSLZT50BU have?

The XPC850DSLZT50BU requires four 3.3-V supplies: VDDH (core), VDDL (I/O), KAPWR (CPM), and VDDSYN (clock synthesis), each regulated to 3.3 V ±10%. All general-purpose I/O pins tolerate 5 V, and the device supports dynamic voltage scaling to 2.2 V for low-frequency operation.