NXP Semiconductors MPC857TCVR66B

Overview

MPC857TCVR66B 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) in a single 357-pin PBGA package. It operates at up to 66 MHz, features 4-Kbyte instruction and 4-Kbyte data caches, one Fast Ethernet Controller (FEC) with MII support, one Serial Communication Controller (SCC1) for Ethernet, one Serial Management Channel (SMC1) for UART, and supports UTOPIA Level 2 for ATM applications in DSL infrastructure.

For engineers reviewing the MPC857TCVR66B datasheet, MPC857TCVR66B pinout, MPC857TCVR66B application, or MPC857TCVR66B equivalent, this page delivers verified technical context including cache configuration, FEC timing, UTOPIA interface capability, thermal resistance (RθJB = 13°C/W), and voltage compliance (3.135–3.465 V).

Technical Context

The MPC857TCVR66B implements a single-issue 32-bit PowerPC architecture core with 32 general-purpose registers, two-way set-associative caches (4-Kbyte instruction, 4-Kbyte data), and a 32-entry fully associative TLB supporting 4/16/512 Kbyte and 8 Mbyte page sizes. Its CPM includes a RISC controller, 8-Kbyte dual-port RAM, and 10 serial DMA channels.

It integrates a Fast Ethernet Controller compliant with IEEE 802.3, supporting simultaneous MII and UTOPIA operation on a multiplexed bus, and provides enhanced SAR (ESAR) mode with OAM performance monitoring, multi-PHY support, and AAL2/VBR functionality stored in ROM. The SIU delivers clock synthesis, JTAG debug, periodic interrupt timer, and low-power stop/sleep/deep-sleep modes.

Key Specifications

Pinout & Package

357-pin PBGA package with 25 × 25 mm body size, 1.27 mm ball pitch, and exposed thermal pad. Pinout validated per Freescale MPC862/857T/857DSL Hardware Specifications Rev. 3 (Fig. 2, Table 5, and pin listing on pp. 11–12).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC857DSL and MPC862T, the MPC857TCVR66B delivers optimized silicon area and power efficiency for single-port ATM/DSL applications, trading peripheral count for lower BOM cost and thermal footprint-making it ideal for space-constrained line cards where ESAR functionality is primary.

Availability

MPC857TCVR66B is available at Aetrix Electronics and suitable for DSLAM line cards, ATM edge routers, industrial protocol gateways, and legacy telecom bridges requiring stable component supply and long-term lifecycle support.

Supply support for MPC857TCVR66B 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 MPC857TCVR66B belongs to the PowerQUICC™ family, designed specifically for cost-effective, low-power ATM and DSL infrastructure applications requiring integrated communications processing, ESAR acceleration, and flexible serial I/O.

FAQ

What is the maximum operating frequency of the MPC857TCVR66B?

The MPC857TCVR66B operates at a maximum CPU frequency of 66 MHz in 1:1 mode (CPU = bus speed). When configured in 2:1 mode, the CPU runs at twice the bus frequency-so a 66 MHz bus yields 132 MHz CPU operation-but the MPC857TCVR66B's rated maximum is 66 MHz. Higher frequencies like 80 MHz or 100 MHz require halving the bus speed (e.g., 40 MHz bus for 80 MHz CPU), per Freescale Hardware Specifications Rev. 3, Section 9.

Does the MPC857TCVR66B support UTOPIA Level 2 and full-duplex operation?

Yes, the MPC857TCVR66B supports UTOPIA Level 2 with added FIFO buffering to reduce cell transmission time, and it supports full-duplex UTOPIA operation in both master (ATM side) and slave (PHY side) configurations using a "split" bus architecture. This capability is explicitly documented in Section 2 ("Features") of the MPC862/857T/857DSL Hardware Specifications Rev. 3.

How many serial communication controllers (SCCs) does the MPC857TCVR66B include?

The MPC857TCVR66B includes exactly one Serial Communication Controller: SCC1. As confirmed in Table 1 and Figure 2 of the Freescale specification, SCC1 is dedicated to Ethernet-only operation on the MPC857T variant, and no additional SCCs are present-unlike the MPC862P/T which feature up to four SCCs.

What power supply voltages are required for the MPC857TCVR66B?

The MPC857TCVR66B requires four distinct 3.3 V supply domains: VDDH (high-speed logic), VDDL (low-speed logic), KAPWR (power-down retention), and VDDSYN (PLL core), all specified at 3.135–3.465 V. Inputs are 5-V tolerant except EXTAL and EXTCLK, which follow VIHC = 0.7×VCC to VCC+0.3 V. These values are defined in Table 5 (DC Electrical Specifications) of the official Freescale documentation.

Is the MPC857TCVR66B pin-compatible with other members of the MPC862/857T/857DSL family?

Yes, the MPC857TCVR66B shares the identical 357-pin PBGA package and pinout with MPC862P, MPC862T, and MPC857DSL per Freescale's mechanical data (Section 14) and block diagrams (Fig. 1 and Fig. 2). However, functional pin assignments differ-for example, pins designated for SCC2/SCC3 on MPC862T are NC or repurposed on MPC857TCVR66B-so PCB layout must match the specific variant's signal mapping.