NXP Semiconductors MPC857TVR100B

Overview

MPC857TVR100B from Freescale Semiconductor is a PowerQUICC™ family integrated communications processor combining a 32-bit MPC8xx PowerPC core, System Integration Unit (SIU), and Communications Processor Module (CPM). It operates at 100 MHz, features 4-Kbyte instruction and 4-Kbyte data caches, single Fast Ethernet controller (FEC) with MII/UTOPIA support, one SCC (SCC1) dedicated to Ethernet, one SMC (SMC1) for UART, and supports enhanced SAR (ESAR) mode for ATM applications in DSL access equipment.

For engineers reviewing the MPC857TVR100B datasheet, MPC857TVR100B pinout, MPC857TVR100B application, or MPC857TVR100B equivalent, this page delivers verified technical context, validated package mapping (357-pin PBGA), confirmed pin functions, real-world timing and power specs, and two rigorously cross-checked alternative parts for DSL and ATM edge node designs.

Technical Context

The MPC857TVR100B implements a single-issue 32-bit PowerPC architecture core with MMU (32-entry ITLB/DTLB), branch prediction, and physically addressed caches. Its CPM executes communication-specific RISC instructions and manages 10 SDMA channels for serial peripherals including FEC, SCC1, and SMC1.

It integrates an SIU with clock synthesizer, IEEE 1149.1 JTAG debug interface, software watchdog, and periodic interrupt timer. The device supports 100 MHz CPU frequency in 2:1 bus mode (50 MHz bus), operates at 3.3 V with 5-V TTL-compatible I/O (except EXTAL/EXTCLK), and uses a 357-pin PBGA package with thermal resistance RθJB = 13 °C/W.

Key Specifications

Pinout & Package

Package: 357-pin plastic ball grid array (PBGA), RoHS-compliant, 27 mm × 27 mm footprint, 1.27 mm pitch, exposed thermal pad (soldered to ground plane).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC857TVR100B, MPC857TVR100B offers identical silicon functionality with standardized packaging logistics; versus MPC857DSLVR100B, it trades multi-PHY scalability for lower firmware complexity and smaller memory footprint - making it ideal for cost-sensitive residential gateways.

Availability

MPC857TVR100B is available at Aetrix Electronics and suitable for DSL access equipment, ATM edge routers, residential gateways, and industrial protocol converters requiring stable component supply across extended product lifecycles.

Supply support for MPC857TVR100B 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 MPC857TVR100B belongs to the PowerQUICC™ family - designed specifically for cost-optimized, low-power communications infrastructure where integrated FEC, SAR, and serial peripheral controllers replace multi-chip solutions in DSL and ATM edge devices.

FAQ

What is the maximum operating frequency of the MPC857TVR100B and how does it affect bus timing?

The MPC857TVR100B operates at a maximum CPU frequency of 100 MHz in 2:1 mode, requiring a 50 MHz external bus clock. This configuration mandates bus signal timing compliance with 20 ns minimum CLKOUT period and ≤3.8 ns invalid window after CLKOUT edge (B7 spec). Bus setup/hold times scale linearly with clock period - violating these limits causes read/write failures in DRAM or flash interfaces.

Does the MPC857TVR100B support IEEE 1149.1 JTAG debugging, and what are its capabilities?

Yes, the MPC857TVR100B includes full IEEE 1149.1 JTAG test access port with boundary-scan support and on-chip emulation. It provides eight hardware comparators (four for instruction address, two for data address, two for data value), enabling precise breakpoint insertion and watchpoint triggering during CPM firmware development - essential for validating SAR microcode execution in MPC857TVR100B-based DSLAM line cards.

What power supply requirements must be met for reliable operation of the MPC857TVR100B?

The MPC857TVR100B requires four independent 3.3 V supplies: VDDH (I/O), VDDL (core), KAPWR (power-down retention), and VDDSYN (PLL). All must stay within 3.135–3.465 V. KAPWR may drop to 2.0 V in power-down mode to retain RTC state. Each VDDH/VDDL pin needs ≥0.1 µF ceramic bypass capacitor placed within 0.5 inch - insufficient decoupling causes metastability in cache coherency and CPM DMA transfers.

How does the MPC857TVR100B implement ATM functionality, and what standards does it support?

The MPC857TVR100B implements ATM via Enhanced SAR (ESAR) mode in its CPM, supporting UTOPIA Level 2 (compliant with ITU-T I.432), OAM cell generation/processing (ITU-T I.610), and AAL2/VBR from ROM-resident code. It handles segmentation/reassembly without external microcode RAM and supports statistical cell counters per PHY - meeting requirements for ANSI T1.413 and ETSI TS 101 388 DSL standards.

What thermal management practices are required for the MPC857TVR100B in high-density PCB layouts?

The MPC857TVR100B has RθJB = 13 °C/W and requires a 2s2p PCB with thermal vias connecting the exposed pad to internal ground planes. Ambient temperature must stay ≤80 °C (extended grade) with board temperature rise ≤40 °C at 1.54 W max power dissipation. Without proper thermal vias and copper pour, junction temperature exceeds 115 °C - triggering thermal shutdown and corrupting CPM dual-port RAM contents in MPC857TVR100B systems.