NXP Semiconductors MPC852TVR50A

Overview

MPC852TVR50A from Freescale Semiconductor is a PowerPC architecture-based integrated communications controller featuring an MPC8xx 32-bit core operating up to 50 MHz, 66-MHz external bus, 1.8-V core/3.3-V I/O with 5-V TTL compatibility, and integrated Fast Ethernet Controller (FEC), CPM, and memory controller - deployed in Ethernet routers, VoIP clients, and WiFi access points.

For engineers reviewing the MPC852TVR50A datasheet, MPC852TVR50A pinout, MPC852TVR50A application, or MPC852TVR50A equivalent, key selection criteria include core/bus frequency ratio (1:1 mode only at 50 MHz), 5-V tolerant I/O pin mapping, thermal resistance (RθJA = 49°C/W on single-layer board), FEC MII interface support, and mandatory reset configuration of SIUMCR[DBGC] and HRCW[DBGC].

Technical Context

The MPC852TVR50A implements a single-issue 32-bit MPC8xx core with 4-Kbyte instruction and data caches (two-way set-associative, 128 sets each), MMU with 32-entry TLB supporting 4/16/512 KB and 8 MB page sizes, and integrated System Integration Unit (SIU) with JTAG, PIT, watchdog, and clock synthesizer. It uses a unified internal bus architecture linking CPU, CPM, and SIU modules.

Its communication subsystem includes one Fast Ethernet Controller (FEC) with MII interface, two SCCs supporting HDLC/UART/Ethernet (SCC3/SCC4), one SMC, SPI master/slave, PCMCIA socket interface (Release 2.1), and dual-port RAM (8 Kbytes). The CPM operates as a RISC co-processor managing serial DMA channels and protocol-specific commands independent of the main CPU.

Key Specifications

Pinout & Package

Package: 272-pin Plastic Ball Grid Array (PBGA), 27 mm × 27 mm, 1.27 mm pitch, RoHS-compliant. Thermal pad exposed on underside for board-level heat conduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC860TVR50A, MPC852TVR50A reduces cost and power by omitting USB and extra CPM resources while retaining full FEC functionality; versus MPC855TVR50A, it avoids external MAC/PHY components and PCI layout constraints, making it superior for compact, standards-compliant Ethernet control applications.

Availability

MPC852TVR50A is available at Aetrix Electronics and suitable for Ethernet routers, VoIP terminals, and WiFi access points requiring stable component supply across industrial temperature ranges and long-lifecycle embedded programs.

Supply support for MPC852TVR50A 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) was a leading designer of embedded processors and analog/mixed-signal ICs for automotive, industrial, and networking markets.

The MPC852TVR50A belongs to the PowerQUICC™ family of integrated communications controllers, designed specifically for cost-effective, low-power Ethernet edge devices requiring real-time protocol processing and minimal external components.

FAQ

What is the maximum operating frequency of the MPC852TVR50A core and bus?

The MPC852TVR50A core operates at a maximum of 50 MHz in 1:1 bus-to-core mode, with corresponding external bus speed up to 66 MHz. Unlike higher-speed variants (e.g., MPC852T-100), the 'VR50A' suffix denotes factory-configured 50-MHz core operation; overclocking is not supported and violates electrical specifications.

Does the MPC852TVR50A support 5-V tolerant I/O, and which pins are rated for 5 V?

Yes, the MPC852TVR50A supports 5-V tolerant inputs on specific pins: PA[0:3], PA[8:11], PB15, PB[24:25], PB[28:31], PC[4:7], PC[12:13], PC15, PD[3:15], TDI, TDO, TCK, TRST, TMS, MII_TXEN, and MII_MDIO. These pins tolerate up to 5.5 V but must not exceed VDDH + 2.5 V at any time, including power-up and power-down sequences.

What thermal design considerations apply to the MPC852TVR50A in a single-layer PCB layout?

For single-layer board use, the MPC852TVR50A has a junction-to-ambient thermal resistance (RθJA) of 49°C/W. At 110 mW typical power dissipation (50 MHz, 1:1 mode), this yields a ~5.4°C temperature rise above ambient - well within the 95°C max junction limit. However, Freescale mandates a four-layer board with dedicated VDD/GND planes for production designs to ensure signal integrity and long-term reliability.

How does the MPC852TVR50A handle reset configuration, and what registers require mandatory initialization?

The MPC852TVR50A requires mandatory post-reset programming of SIUMCR[DBGC] and HRCW[DBGC] to binary X1 (where X = 0 or 1) to enable debug features. Additionally, MBMR[GPLB4DIS] must be set to 0, and port direction registers (PADIR, PBDIR, PCDIR) must configure specific pins as outputs per Table 6 in the hardware specification document MPC852TEC Rev. 4.

Can the MPC852TVR50A operate without external memory, and what boot options are supported?

Yes, the MPC852TVR50A supports boot from internal ROM or external memory. At reset, it samples boot configuration pins to select boot source: 8-, 16-, or 32-bit memory interface on chip-select CS0. The memory controller supports glueless connection to DRAM, SRAM, Flash, and EPROM, enabling standalone operation with on-board flash for bootloader and application code - no external memory is strictly required for minimal configurations.