NXP Semiconductors MPC852TZT66A

Overview

MPC852TZT66A from Freescale Semiconductor is a PowerPC architecture-based integrated communications controller featuring an MPC8xx core operating up to 100 MHz with 66-MHz external bus support, 1.8-V core / 3.3-V I/O voltage operation, and integrated Fast Ethernet Controller (FEC), CPM, and memory controller - deployed in Ethernet routers, VoIP clients, WiFi access points, and CPE equipment.

For engineers reviewing the MPC852TZT66A datasheet, MPC852TZT66A pinout, MPC852TZT66A application, or MPC852TZT66A equivalent, this page delivers verified technical context, validated package mapping, confirmed timing parameters (66-MHz bus, 100-MHz core), thermal resistance values (RθJA = 32°C/W on 4-layer board), and real-world substitution guidance for legacy PowerQUICC™ system design continuity.

Technical Context

The MPC852TZT66A implements a single-issue 32-bit MPC8xx core with 4-Kbyte instruction and data caches (two-way set-associative, 128 sets), MMU with 32-entry fully associative TLBs supporting 4/16/512 KB and 8 MB page sizes, and integrated System Integration Unit (SIU) with JTAG debug interface, periodic interrupt timer, and software watchdog.

Its Communication Processor Module (CPM) includes an 8-Kbyte dual-port RAM, eight serial DMA channels, two SCCs supporting IEEE 802.3 10-Mbps Ethernet, one SMC, SPI interface, PCMCIA-ATA master interface, and two baud rate generators - all interconnected via a unified 32-bit internal bus architecture.

Key Specifications

Pinout & Package

Package: 256-pin Plastic Ball Grid Array (PBGA), 27 mm × 27 mm, 1.27 mm pitch - thermally optimized for board-level heat conduction via exposed pad (RθJB = 24°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC866PZQ66D and MPC823EZT66A, the MPC852TZT66A uniquely balances 10-Mbps FEC integration, 1.8-V power efficiency, and legacy PowerQUICC™ software compatibility - making it the sole viable option for maintaining production continuity in established CPE and VoIP designs without redesigning power or layout.

Availability

MPC852TZT66A is available at Aetrix Electronics and suitable for Ethernet routers, VoIP terminal adapters, and WiFi access point baseband systems requiring stable component supply amid long-life industrial product cycles.

Supply support for MPC852TZT66A 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 Power Architecture™ processors for networking, automotive, and industrial control applications before its 2015 acquisition.

The MPC852TZT66A belongs to the PowerQUICC™ family - engineered specifically for cost-optimized, low-power embedded communications controllers targeting CPE, VoIP, and industrial Ethernet edge devices.

FAQ

What is the maximum supported external bus frequency for the MPC852TZT66A?

The MPC852TZT66A supports a maximum external bus frequency of 66 MHz in both 1:1 and 2:1 bus-to-core ratio modes. At 66 MHz bus speed, the core may operate at 66 MHz (1:1) or 132 MHz (2:1), though the MPC852TZT66A's rated core maximum is 100 MHz - limiting 2:1 mode to ≤50 MHz bus. This constraint is documented in Section 2 Features and Table 8 of the MPC852TEC Rev. 4 specification.

Does the MPC852TZT66A include an integrated Ethernet MAC?

Yes, the MPC852TZT66A integrates a Fast Ethernet Controller (FEC) compliant with IEEE 802.3 for 10-Mbps operation, with MII interface support for external PHY connection. It does not include a physical layer transceiver - the FEC handles MAC-layer functions only, requiring an external PHY such as the DP83848 or KS8721. This is confirmed in the Overview (page 2) and Features (page 3) sections of the MPC852TEC document.

What are the mandatory power supply sequencing requirements for the MPC852TZT66A?

VDDL (core) must not exceed VDDH (I/O) during power-on reset or power-down; VDDL must remain ≤1.9 V and VDDH ≤3.465 V at all times. Violation risks forward-biasing internal ESD diodes and permanent damage. Figure 3 in Section 9 provides a recommended Schottky diode-based sequencing circuit. These constraints are specified in Section 9 "Power Supply and Power Sequencing" and Table 1 "Maximum Tolerated Ratings".

Which pins on the MPC852TZT66A are 5-V tolerant, and what are their voltage limits?

The MPC852TZT66A 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 absolute maximum, but must never exceed VDDH + 2.5 V - e.g., if VDDH = 3.3 V, max input = 5.8 V, though 5.5 V is the hard limit. This is defined in Table 5 and Section 9 of the MPC852TEC spec.

Is the MPC852TZT66A pin-compatible with other PowerQUICC™ devices like the MPC860 or MPC823?

No, the MPC852TZT66A is not pin-compatible with the MPC860 or MPC823. While sharing architectural lineage, it uses a unique 256-pin PBGA package with distinct pin assignments, power pin distribution (separate VDDL/VDDH/VDDSYN), and I/O multiplexing. Pinout differences are evident in mechanical drawings (Section 16) and register-level configuration requirements (e.g., mandatory PAPAR/PADIR settings in Table 6), confirming non-interchangeability without PCB redesign.