NXP Semiconductors MPC852TZT50A

Overview

MPC852TZT50A 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 operation with 5-V TTL compatibility, and integrated Fast Ethernet Controller (FEC), CPM, and memory controller - deployed in CPE equipment, Ethernet routers, VoIP clients, and WiFi access points.

For engineers reviewing the MPC852TZT50A datasheet, MPC852TZT50A pinout, MPC852TZT50A application, or MPC852TZT50A equivalent, this page delivers verified electrical specs (VDDL = 1.7–1.9 V, VDDH = 3.135–3.465 V), thermal resistance (RθJA = 49 °C/W on single-layer board), bus timing (66 MHz max), cache configuration (4-KB instruction/data, two-way set-associative), and mandatory reset register settings per HRCW/SIUMCR.

Technical Context

The MPC852TZT50A implements a single-issue 32-bit PowerPC core with MMU, 4-KB instruction and 4-KB data caches (two-way set-associative, 128 sets each), and physically addressed cache coherency maintained on 128-bit blocks. It integrates a System Integration Unit (SIU) with JTAG debug interface, periodic interrupt timer, watchdog, and clock synthesizer.

Its Communication Processor Module (CPM) includes an 8-KB dual-port RAM, eight serial DMA channels, two SCCs supporting IEEE 802.3 10-Mbps Ethernet, one SMC, SPI, PCMCIA-ATA interface, and two baud rate generators - all interconnected via three independent 32-bit internal buses (core, SIU, CPM).

Key Specifications

Pinout & Package

Package: 256-pin PBGA (Plastic Ball Grid Array), 27 mm × 27 mm, 1.27 mm pitch, RoHS-compliant. Thermal pad on underside requires soldered connection to PCB ground plane for RθJB = 24 °C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC852TZT50A, MPC860TZQ50B offers higher bandwidth and protocol flexibility at increased cost and layout complexity, while MPC823ZT50A sacrifices Ethernet capability for lower price and power - making MPC852TZT50A the optimal balance for cost-constrained 10-Mbps embedded networking.

Availability

MPC852TZT50A is available at Aetrix Electronics and suitable for CPE equipment, Ethernet routers, and VoIP client terminals requiring stable component supply across extended product lifecycles.

Supply support for MPC852TZT50A 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) designed high-performance PowerQUICC processors for embedded networking and communications infrastructure.

The MPC852TZT50A belongs to the PowerQUICC™ family - engineered specifically for cost-sensitive, low-power Ethernet edge devices where integration of CPU, FEC, CPM, and memory controller reduces system-level complexity.

FAQ

What is the maximum operating frequency of the MPC852TZT50A core and external bus?

The MPC852TZT50A core operates up to 50 MHz in 1:1 bus mode, with a maximum external bus speed of 66 MHz. This configuration ensures synchronous operation between CPU and memory subsystems while maintaining signal integrity on standard PCB layouts. The MPC852TZT50A datasheet specifies that 50/66 MHz operation supports both 1:1 and 2:1 modes, but only 2:1 mode is valid for higher frequencies - which do not apply to the MPC852TZT50A variant.

Does the MPC852TZT50A support 100-Mbps Fast Ethernet?

No, the MPC852TZT50A integrates a Fast Ethernet Controller (FEC) compliant with IEEE 802.3 for 10-Mbps operation only. Its SCC3 and SCC4 support Ethernet/IEEE 802.3 standard at full 10-Mbps speed, but lack the PHY interface logic or timing margins required for 100-Mbps base-T. For 100-Mbps capability, engineers must select higher-tier variants like MPC860TZQ50B.

What are the mandatory power supply sequencing requirements for the MPC852TZT50A?

VDDL (core) must never exceed VDDH (I/O) during power-on reset or power-down - a violation forward-biases internal ESD diodes and risks permanent damage. The MPC852TZT50A requires VDDL ≤ 1.9 V and VDDH ≤ 3.465 V, with VDDL ramping after VDDH. Freescale recommends using Schottky diodes (e.g., MUR420) in the voltage sequencing circuit shown in Figure 3 of the MPC852TEC specification to enforce this constraint.

Which pins on the MPC852TZT50A are 5-V tolerant, and what are the voltage limits?

The MPC852TZT50A has 5-V tolerant pins including 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 - a restriction applying during power-up, normal operation, and power-down. All other inputs are limited to 3.465 V maximum.

What reset configuration registers must be programmed after HRESET deassertion on the MPC852TZT50A?

After HRESET deassertion, the MPC852TZT50A requires mandatory programming of HRCW[DBGC] = X1 and SIUMCR[DBGC] = X1 in boot code. Additionally, MBMR[GPLB4DIS] = 0, PAPAR/PADIR, PBPAR/PBDIR, and PCPAR/PCDIR fields listed in Table 6 of the MPC852TEC spec must be set to their specified binary values - failure to configure these registers results in undefined peripheral behavior or boot failure.