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NXP Semiconductors MC68306FC16B
- Part No.:
- MC68306FC16B
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
MC68306FC16B.pdf
- Description:
- IC MPU M683XX 16MHZ 132PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,451
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Product details
Overview
MC68306FC16B from Freescale Semiconductor (formerly Motorola) is a 16-bit integrated microcontroller unit (MCU) featuring an MC68EC000 CPU core, on-chip DRAM controller, dual-channel UART serial module, programmable parallel I/O ports, interrupt controller, and IEEE 1149.1 JTAG test interface. It operates at 16 MHz, supports 24-bit addressing (16 MB address space), and targets embedded industrial control systems requiring deterministic real-time response and board-level integration.
For engineers reviewing the MC68306FC16B datasheet, MC68306FC16B pinout, MC68306FC16B application, or MC68306FC16B equivalent, key selection considerations include its 16 MHz EC000 core performance, integrated DRAM timing control, dual asynchronous serial channels with FIFOs, 16-bit parallel port flexibility, and JTAG-based debug and boundary-scan capability in legacy industrial designs.
Technical Context
The MC68306FC16B implements a fully static, 16-bit MC68EC000 CPU core compatible with the M68000 instruction set, supporting supervisor/user modes, exception vectoring, and bus arbitration. Its integrated peripherals include a DRAM controller with RAS/CAS multiplexing, eight chip-select outputs configurable for memory or I/O mapping, and two independent serial communication channels with baud-rate generators and status-controlled transmit/receive FIFOs.
System-level features include a programmable bus timeout monitor, automatic DTACK generation for asynchronous peripheral interfacing, and a dedicated mode controller for boot configuration. The IEEE 1149.1 TAP controller enables boundary-scan testing and in-circuit debugging without halting CPU execution - critical for field-deployed industrial controllers where runtime visibility is essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | MC68EC000 16-bit CISC core, binary-compatible with M68000, no MMU, 24-bit address bus (16 MB space) |
| Maximum Clock Frequency | 16 MHz - defines real-time instruction throughput and peripheral timing margins for deterministic control loops |
| On-Chip Peripherals | DRAM controller (RAS0–RAS1, CAS0–CAS1), dual UARTs (RxDA/TxDA, RxDB/TxDB), 16-bit parallel I/O (PA0–PA7, PB0–PB7), 8-channel interrupt controller |
| Serial Module | Dual independent channels with 3-byte TX/RX FIFOs, programmable baud rates, RTS/CTS flow control, and local/remote loopback modes |
| JTAG Interface | IEEE 1149.1 compliant TAP controller (TCK, TMS, TDI, TDO, TRST) enabling boundary-scan test and non-intrusive debug |
| Package & Pin Count | 132-pin PQFP (Plastic Quad Flat Package), 20.0 × 20.0 mm body, 0.65 mm pitch - standard for high-I/O industrial MCU layouts |
| Supply Voltage | 5.0 V ± 5% - compatible with legacy TTL/CMOS logic families and industrial power rails |
Pinout & Package
MC68306FC16B is housed in a 132-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch, optimized for thermal dissipation and PCB routing density in industrial control modules. Pin functions are defined per Motorola MC68306UM/AD Rev. 1 (1993), Section 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A23–A1 | Address Bus Outputs | 23-bit multiplexed address bus (A23–A1); A0 derived internally - enables 16 MB linear addressing with external latch synchronization |
| D15–D0 | Data Bus Bidirectional | 16-bit bidirectional data bus; supports byte (UDS/LDS) and word transfers - interfaces directly to SRAM, flash, or peripheral registers |
| R/W | Read/Write Control | Active-high write enable; synchronizes data direction on D15–D0 during memory or I/O cycles |
| DTACK | Data Transfer Acknowledge Input | Asynchronous handshake signal indicating external device readiness - allows glueless interfacing to slow peripherals via automatic DTACK generation |
| RESET | Reset Input | Active-low synchronous reset; initializes CPU state, clears internal registers, and forces boot vector fetch from address $000000 |
| IRQ1–IRQ7 | Interrupt Request Inputs | Seven level-sensitive, prioritized interrupt inputs - supports daisy-chained or vectored interrupt handling for real-time event response |
| TCK, TMS, TDI, TDO, TRST | JTAG Test Access Port | Standard 5-signal IEEE 1149.1 interface - enables production test, in-system programming, and non-intrusive debug without CPU halt |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DRAM Controller | Generates RAS/CAS strobes and refresh timing for up to 4 banks of DRAM - eliminates external DRAM controller IC and reduces BOM count |
| Dual Asynchronous Serial Channels | Each channel supports full-duplex RS-232/422-level communication with hardware flow control (RTS/CTS), FIFO buffering, and loopback diagnostics |
| Programmable Parallel I/O Ports | Two 8-bit bidirectional ports (PA and PB) with individual pin direction control - enables direct sensor/actuator interfacing without external latches |
| Automatic DTACK Generation | Hardware-generated DTACK for zero-wait-state access to fast peripherals - simplifies timing design and removes need for external wait-state logic |
| Bus Timeout Monitor | Configurable watchdog timer that asserts BERR after programmable bus cycle timeout - prevents system lockup during peripheral failure or bus contention |
Applications
| Industrial PLC Base Unit | Legacy CNC Machine Controller |
|---|---|
|
Use Scenario: Central processing unit in modular programmable logic controllers handling ladder logic execution, I/O scanning, and serial HMI communication. IC Role / Device Role / Timing Role: Main MCU executing real-time control tasks, managing discrete I/O via PA/PB ports, and coordinating dual serial links to operator panels and drive modules. Use Value: Integrated DRAM controller and automatic DTACK reduce external logic, while JTAG support enables field firmware updates and diagnostic trace without disassembly. |
Use Scenario: Motion control processor in retrofit CNC systems interfacing stepper/servo drives, limit switches, and pendant terminals via RS-232. IC Role / Device Role / Timing Role: Deterministic real-time executor of G-code parsing and pulse train generation, using UARTs for host communication and parallel ports for encoder feedback capture. Use Value: 16 MHz EC000 core delivers sufficient MIPS for closed-loop motion profiles; dual FIFO-equipped UARTs prevent data loss during high-speed spindle telemetry bursts. |
| Telecom Line Card Management | Power Substation RTU |
|
Use Scenario: Supervisory controller on legacy telecom line cards monitoring voltage, temperature, and alarm status across multiple E1/T1 interfaces. IC Role / Device Role / Timing Role: System manager polling sensors and relays via parallel I/O, logging events over serial link, and triggering failover via IRQ-driven interrupt service routines. Use Value: Eight prioritized IRQ inputs allow immediate response to critical alarms; bus timeout monitor ensures recovery from hung peripheral buses in unattended deployments. |
Use Scenario: Remote terminal unit in electric utility substations collecting breaker status, current/voltage measurements, and SCADA command execution. IC Role / Device Role / Timing Role: Field-deployed embedded controller running cyclic data acquisition, time-stamped event reporting, and secure serial protocol stacks over RS-485. Use Value: IEEE 1149.1 JTAG enables remote boundary-scan validation after lightning-induced transients; 5 V tolerance ensures robustness in noisy substation EMI environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar embedded controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68332ACPV16 | 16 MHz 32-bit CPU (CPU32 core), no DRAM controller, includes QSM (Queue Serial Module) instead of dual UARTs, 112-pin PQFP | Better computational throughput but lacks integrated DRAM timing - requires external memory controller for DRAM-based designs | Select when migrating to 32-bit code base and external memory is already present; not drop-in due to pinout and peripheral mismatch |
| HD64F3687F20 | 20 MHz 16-bit H8/300H core, integrated CAN and USB interfaces, 128-pin LQFP, 3.3 V operation | Modern low-voltage I/O and automotive-grade serial protocols - incompatible voltage domain and missing JTAG boundary-scan | Choose for new designs requiring CAN bus connectivity and lower power; not suitable for legacy 5 V, JTAG-dependent maintenance workflows |
Compared with MC68306FC16B, the MC68332ACPV16 offers higher instruction throughput but sacrifices DRAM integration, while the HD64F3687F20 provides modern serial interfaces and lower voltage operation but abandons JTAG testability and 5 V compatibility - making MC68306FC16B uniquely suited for maintaining and extending long-lifecycle industrial controllers.
Availability
MC68306FC16B is available at Aetrix Electronics and suitable for industrial PLC base units, legacy CNC machine controllers, telecom line card management, and power substation RTUs requiring stable component supply and long-term obsolescence mitigation.
Supply support for MC68306FC16B 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, founded from Motorola's semiconductor division in 2004.
The MC68306FC16B belongs to the MC68300 family of integrated microcontrollers, designed specifically for cost-sensitive, high-reliability industrial automation systems requiring CPU + memory + I/O integration in a single package.
FAQ
What is the maximum operating frequency of the MC68306FC16B?
The MC68306FC16B is rated for a maximum clock frequency of 16 MHz, as specified in the Motorola MC68306UM/AD User's Manual (Section 8, Electrical Specifications). This frequency determines the instruction execution rate, peripheral timing budgets, and maximum achievable baud rates for its dual serial channels. Operation above 16 MHz is not guaranteed and may result in undefined behavior or data corruption. The MC68306FC16B must be operated within this limit for reliable function in industrial control applications.
Does the MC68306FC16B include an onboard memory controller?
Yes, the MC68306FC16B integrates a dedicated DRAM controller supporting up to four banks of dynamic RAM, with programmable RAS/CAS timing, refresh intervals, and bank configuration registers. It generates DRAMA0–DRAMA14, RAS0–RAS1, CAS0–CAS1, and DRAMW signals directly - eliminating the need for external DRAM control logic. This feature is documented in Section 1.2.2 and Section 5.2.7 of the MC68306UM/AD manual.
How many serial communication interfaces does the MC68306FC16B provide?
The MC68306FC16B provides two independent asynchronous serial communication channels (Channel A and Channel B), each with full-duplex capability, 3-byte transmit/receive FIFOs, programmable baud-rate generators, and hardware flow control (RTS/CTS). These are implemented in the on-chip Serial Module described in Section 6 of the MC68306UM/AD. Neither channel supports synchronous or ISO/IEC 7816 protocols - they are strictly UART-style interfaces.
Is JTAG debugging supported on the MC68306FC16B?
Yes, the MC68306FC16B includes a fully compliant IEEE 1149.1 Test Access Port (TAP) controller with TCK, TMS, TDI, TDO, and TRST pins. This enables boundary-scan testing, in-circuit emulation, and non-intrusive debug without halting CPU execution - a key capability for field maintenance of deployed industrial controllers. The TAP functionality is detailed in Section 7 of the MC68306UM/AD user's manual.
What package type is used for the MC68306FC16B?
The MC68306FC16B is packaged in a 132-pin Plastic Quad Flat Package (PQFP) with 20.0 × 20.0 mm body dimensions and 0.65 mm lead pitch. This package is specified in Section 9 (Ordering Information and Mechanical Data) of the MC68306UM/AD manual and is compatible with standard surface-mount assembly processes used in industrial electronics manufacturing.
MC68306FC16B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 132-BQFP Bumpered
- Series:
- M683xx
- Packaging:
- Tray
- Product Status:
- Obsolete
- Core Processor:
- EC000
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 16MHz
- Co-Processors/DSP:
- -
- RAM Controllers:
- DRAM
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- -
- SATA:
- -
- USB:
- -
- Voltage - I/O:
- 5.0V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 132-PQFP (24.13x24.13)
- Additional Interfaces:
- DUART
MC68306FC16B FAQ
1.How can I place an order for MC68306FC16B through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68306FC16B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68306FC16B reliable?
The price and inventory of MC68306FC16B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68306FC16B is usually 5 days.
3.What payment methods are accepted for MC68306FC16B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68306FC16B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68306FC16B?
MC68306FC16B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68306FC16B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68306FC16B?
For technical support, including MC68306FC16B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68306FC16B requirements.
6.How does Aetrix verify that MC68306FC16B is sourced from the original manufacturer or authorized distributors?
All MC68306FC16B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68306FC16B meets industry standards.
7.What is the process for return or replacement of MC68306FC16B?
All MC68306FC16B units undergo pre-shipment inspection (PSI). If there is an issue with MC68306FC16B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68306FC16B part is unused and in its original packaging.
Return procedure for MC68306FC16B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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