NXP Semiconductors MPC870CZT66

Overview

MPC870CZT66 from Freescale Semiconductor is a 32-bit Power Architecture™ microprocessor with integrated communications processor module (CPM), dual 10/100 Mbps Fast Ethernet controllers (FEC), USB 2.0 full-/low-speed interface, and 8-Kbyte instruction/data caches - operating at 66 MHz core frequency in 1:1 bus mode, supporting embedded networking and controller applications requiring deterministic real-time communication.

For engineers reviewing the MPC870CZT66 datasheet, MPC870CZT66 pinout, MPC870CZT66 application, or MPC870CZT66 equivalent, key selection criteria include its 66 MHz core speed, 1.8-V core / 3.3-V I/O voltage operation, PBGA-256 package, lack of security engine, and dual FEC + USB host/function capability for industrial gateways and protocol-conversion devices.

Technical Context

The MPC870CZT66 integrates an MPC8xx core with MMU, two-way set-associative 8-Kbyte instruction and data caches, and a dedicated CPM RISC controller managing serial peripherals via 8-Kbyte dual-port RAM. Its SIU provides clock synthesis, PIT, watchdog, and IEEE 1149.1 JTAG debug support.

It supports 32-bit external bus interfacing with dynamic bus sizing (8/16/32-bit), up to eight memory banks with programmable wait states, and glueless connectivity to DRAM, SRAM, Flash, and EPROM. Unlike the MPC875, it omits the security engine and 10BaseT Ethernet, confirming its role as a cost-optimized dual-FEC communications processor.

Key Specifications

Pinout & Package

The MPC870CZT66 is housed in a 256-ball plastic ball grid array (PBGA) package with 1.27 mm pitch, designed for high-density PCB layouts and thermal dissipation via soldered thermal balls to internal ground planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPC875CZT66, MPC870CZT66 removes security engine and 10BaseT to reduce cost and power, making it ideal for non-encrypted dual-Ethernet bridges; versus MPC885CZQ66, it trades DDR/PCI capability for pin compatibility and lower system complexity in established PowerQUICC II designs.

Availability

MPC870CZT66 is available at Aetrix Electronics and suitable for industrial protocol gateways, network edge routers, telecom access nodes, and embedded diagnostic tools requiring stable component supply, long-lifecycle support, and verified second-source availability.

Supply support for MPC870CZT66 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, analog, and connectivity solutions for automotive, industrial, and networking markets.

The MPC870CZT66 belongs to the PowerQUICC™ II family - designed specifically for cost-effective, integrated communications processors targeting Ethernet-aware embedded controllers where deterministic serial and packet processing is required without cryptographic acceleration.

FAQ

What is the maximum operating junction temperature for the MPC870CZT66?

The MPC870CZT66 has a maximum junction temperature of 95 °C under standard operating conditions and 100 °C for extended temperature grade. This rating assumes proper thermal design using the specified RθJA (43 °C/W) or RθJB (20 °C/W) values, and adherence to voltage sequencing requirements to prevent ESD diode stress during power-up.

Does the MPC870CZT66 support USB host functionality?

Yes, the MPC870CZT66 supports USB 2.0 full-/low-speed host controller mode in addition to function endpoint mode. It provides four independent endpoints, CRC16/5 generation and checking, NRZI encoding/decoding with bit stuffing, and automatic retransmission on transmit error - enabling direct connection to USB peripherals like flash drives or displays without external host controllers.

How does the MPC870CZT66 differ from the MPC875CZT66?

The MPC870CZT66 omits the security engine (AESU/DEU/MDEU), lacks 10BaseT Ethernet support, and excludes the time-slot assigner (TSA) present in the MPC875CZT66. Both share identical 66 MHz core speed, 8-Kbyte caches, dual FEC, USB, and PBGA-256 packaging - making MPC870CZT66 a streamlined variant optimized for non-encrypted dual-FEC applications.

What power supply sequencing is required for reliable MPC870CZT66 operation?

VDDL (core) must not exceed VDDH (I/O) during power-up/down, and both must remain within absolute max ratings: VDDL ≤ 1.9 V, VDDH ≤ 3.465 V. A recommended sequencing circuit uses MUR420 Schottky diodes to limit VDDL–VDDH differential on power-up and 1N5820 diodes on power-down - ensuring ESD protection diodes remain reverse-biased and preventing latch-up or long-term reliability degradation.

Can the MPC870CZT66 operate in 2:1 bus mode at 66 MHz core frequency?

No - the MPC870CZT66 supports 66 MHz core frequency only in 1:1 bus mode, where the external bus runs at 66 MHz. The 2:1 mode is reserved for the 133 MHz core variant (e.g., MPC875CZT133). Attempting 2:1 mode at 66 MHz violates the device's timing specification and may result in undefined behavior or bus errors due to mismatched clock domain synchronization.