NXP Semiconductors MC68EN360AI25L

Overview

MC68EN360AI25L from Freescale Semiconductor is a 32-bit integrated communications controller (QUICC™) featuring a CPU32+ core, System Integration Module (SIM60), and Communications Processor Module (CPM). It delivers 4.5 MIPS at 25 MHz, supports four SCCs (including Ethernet/IEEE 802.3 on SCC1), two SMCs, one SPI, dual TDM buses, and operates across –40°C to +85°C in a 240-pin PQFP package. It is used in industrial gateways, T1/E1 multiplexers, and protocol-bridging routers.

For engineers reviewing the MC68EN360AI25L datasheet, MC68EN360AI25L pinout, MC68EN360AI25L application, or MC68EN360AI25L equivalent, key selection considerations include its 25 MHz maximum clock frequency, support for HDLC/SDLC up to 2 Mbps per SCC, Ethernet capability on SCC1, dual TDM time-slot assignment, and compatibility with MC68040 companion mode for high-performance host integration.

Technical Context

The MC68EN360AI25L implements a tightly coupled dual-module architecture: the CPU32+ core handles general-purpose processing and system control, while the RISC-based CPM offloads all serial communications tasks-including frame assembly, CRC generation, and buffer descriptor management-via 224 on-chip BD entries. Its SIM60 provides bus arbitration, clock synthesis, periodic interrupt timer, and IEEE 1149.1 JTAG test access.

It features dynamic bus sizing (8/16/32-bit), slave mode operation for use with external processors (e.g., MC68EC040), and glueless interfacing to DRAM, EPROM, and SRAM. The device supports boot from 8-, 16-, or 32-bit memory via dedicated chip select logic and includes four CAS/WE lines plus OE for flexible memory subsystem design.

Key Specifications

Pinout & Package

MC68EN360AI25L is housed in a 240-pin Plastic Quad Flat Pack (PQFP) with 0.5 mm lead pitch and exposed thermal pad. Pin functions are multiplexed across 14 functional groups including address/data bus, serial I/O, clock/control, and power/ground. Full pin mapping requires reference to Freescale Document MC68360UM/AD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EN360RC25 and MC68EN360EM25, the MC68EN360AI25L uniquely combines Ethernet-enabled SCC1, industrial temperature rating (–40°C to +85°C), and PQFP packaging - making it the sole option for ruggedized outdoor or factory-floor communications nodes requiring IEEE 802.3 connectivity.

Availability

MC68EN360AI25L is available at Aetrix Electronics and suitable for industrial gateways, telecom access nodes, embedded routers, and legacy network bridges requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC68EN360AI25L 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, specializing in automotive, industrial, and networking solutions.

The MC68EN360AI25L belongs to the QUICC™ family - a line of highly integrated communications controllers engineered to replace discrete protocol engines and reduce system-level complexity in telecom and industrial networking equipment.

FAQ

What is the maximum operating frequency of the MC68EN360AI25L?

The MC68EN360AI25L is rated for operation up to 25 MHz across its full industrial temperature range (–40°C to +85°C). This frequency determines the peak instruction throughput of the CPU32+ core (4.5 MIPS) and the maximum data rate supported by its serial channels - for example, HDLC/SDLC operation at 2 Mbps per SCC is guaranteed at this clock speed. The device uses a static core design, allowing it to operate at lower frequencies or be halted entirely for low-power modes.

Does the MC68EN360AI25L support Ethernet functionality?

Yes, the MC68EN360AI25L supports IEEE 802.3 10BASE-T Ethernet on SCC1, as confirmed in Freescale documentation. This capability is exclusive to the "EN" variant (e.g., MC68EN360AI25L) and not present in base MC68360 versions. SCC1 provides full MAC-layer functions including CRC generation, frame validation, and backoff logic, but requires an external PHY transceiver (e.g., DP83932) for physical layer signaling.

What memory interfaces does the MC68EN360AI25L support?

The MC68EN360AI25L supports dynamic bus sizing for 8-, 16-, and 32-bit memory interfaces, with up to 32 address lines and dedicated control signals including four CAS, four WE, and one OE. It includes boot-strapping logic that selects memory width at reset and integrates a DRAM controller capable of managing SIMM modules - enabling glueless connection to EPROM, Flash, SRAM, and DRAM without external logic.

Can the MC68EN360AI25L operate as a peripheral to a host processor?

Yes, the MC68EN360AI25L supports slave mode operation, allowing it to function as an intelligent communications peripheral under control of an external host such as the MC68EC040. In MC68040 companion mode, the host processor delegates serial I/O, DRAM control, and interrupt handling to the MC68EN360AI25L - reducing host overhead and simplifying system architecture in high-throughput router or gateway designs.

What is the role of the Communications Processor Module (CPM) in the MC68EN360AI25L?

The CPM in the MC68EN360AI25L is a dedicated RISC coprocessor that independently manages all serial communications tasks - including HDLC framing, UART transmission, SPI transfers, and TDM time-slot assignment - using 224 buffer descriptors and 2.5 KB of dual-port RAM. It relieves the CPU32+ core from real-time I/O handling, enabling deterministic latency for time-critical protocols like T1 framing or industrial Ethernet bridging.