NXP Semiconductors MC68302FC16C

Overview

MC68302FC16C from Freescale Semiconductor is a 32-bit integrated communications microcontroller with on-chip CPU32 core, dual UARTs, timer system, and programmable interrupt controller, operating at 16 MHz with 132-pin PQFP package and supporting Motorola 68k bus protocol timing. It integrates serial communication peripherals (SCC/SCP), DMA, and system control logic for embedded telecom and industrial control applications.

For engineers reviewing the MC68302FC16C datasheet, MC68302FC16C pinout, MC68302FC16C application, or MC68302FC16C equivalent, key selection considerations include its 16 MHz clock rating, 132-pin PQFP mechanical compatibility, CPU32 instruction set compliance, and integrated SCC/SCP channel timing specifications per Table 1 of the March 1997 MC68302 document.

Technical Context

The MC68302FC16C implements the CPU32 core with 32-bit internal data path and 24-bit address bus, executing instructions in a three-stage pipeline. Its bus interface supports synchronous and asynchronous memory access with programmable wait-state generation and DTACK-driven handshaking.

It integrates two independent serial communication controllers (SCC) supporting HDLC, SDLC, and async protocols, plus a serial communications processor (SCP) for bit-oriented framing. Timing parameters-including tchdtl ≤25 ns (Clock high to DTACK low), tcldth ≤22 ns (Clock low to DTACK high), and tchdov ≤15 ns (Clock high to data out valid)-are specified for 16 MHz operation.

Key Specifications

Pinout & Package

MC68302FC16C uses a 132-pin PQFP package (JEDEC MS-026AC) with 20.0 × 20.0 mm body size, 1.4 mm height, and 0.65 mm lead pitch. Pin functions are defined per Freescale's MC68302 documentation, including dedicated address/data multiplexed bus lines, control signals (AS, DS, R/W, DTACK), and peripheral I/O (TIN, TOUT, RXD/TXD, SCC/SCP pins).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68302FC16C, MC68360RC25C delivers higher clock rate and hardware packet acceleration but requires PCB redesign due to larger package; MC68332CFN16 retains CPU32 compatibility and 16 MHz speed but removes SCC/SCP, shifting serial tasks to external components or software emulation.

Availability

MC68302FC16C is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol gateways, point-of-sale terminals, and legacy equipment replacement programs requiring stable component supply and long-term obsolescence support.

Supply support for MC68302FC16C 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 silicon.

The MC68302 belongs to Freescale's 68k-family integrated communications microcontroller line, designed specifically for cost-sensitive, real-time embedded systems requiring protocol-aware serial connectivity without external co-processors.

FAQ

What is the maximum operating frequency of the MC68302FC16C?

The MC68302FC16C is rated for a maximum clock frequency of 16 MHz, as confirmed by Freescale's March 1997 MC68302 documentation. This frequency governs CPU32 core execution speed, bus timing margins, and peripheral interface rates. All timing parameters-including tchdtl ≤25 ns and tcldth ≤22 ns-are specified under this 16 MHz condition. Exceeding this limit may violate setup/hold timing and cause undefined behavior.

Does the MC68302FC16C support pin-compatible upgrades to higher-speed variants?

No documented pin-compatible upgrade path exists for the MC68302FC16C. While MC68360RC25C shares the CPU32 core and functional blockset, it uses a 208-pin PQFP package versus the MC68302FC16C's 132-pin PQFP-requiring PCB layout changes. Freescale's documentation does not list any drop-in replacements with identical pinout and 16 MHz timing compliance.

How many serial communication channels does the MC68302FC16C integrate?

The MC68302FC16C integrates two fully independent Serial Communication Controllers (SCC) and one Serial Communications Processor (SCP). Each SCC supports HDLC, SDLC, and async modes with dedicated registers and interrupt vectors. The SCP provides bit-oriented framing and synchronization for custom serial protocols. These are distinct hardware blocks-not software-configurable UART instances-and are explicitly detailed in the MC68302 functional description.

What package type and dimensions does the MC68302FC16C use?

The MC68302FC16C uses a 132-pin Plastic Quad Flat Package (PQFP) conforming to JEDEC standard MS-026AC. Its body measures 20.0 mm × 20.0 mm with 1.4 mm maximum height and 0.65 mm lead pitch. This package is verified in Freescale's MC68302 packaging documentation and matches the "FC" suffix designation in the part number, which denotes PQFP construction.

Is the MC68302FC16C still supported by NXP for new designs?

NXP Semiconductors lists MC68302FC16C as obsolete with no active design-in support, consistent with its 1997 documentation date and discontinuation timeline. However, Aetrix Electronics maintains traceable inventory and offers lifecycle availability coordination-including last-time buy planning and cross-reference guidance-for legacy systems dependent on MC68302FC16C in production or maintenance phases.