MC68SEC000FU16 - 16MHz 32-bit M680x0 MPU | Freescale/NXP
MPN: MC68SEC000FU16 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.25 | $162.50 |
| 100 | $13.9 | $1,390.00 |
| 500 | $11.75 | $5,875.00 |
| 1,000 | $9.85 | $9,850.00 |
MC68SEC000FU16 Overview
A microprocessor (MPU) is a programmable digital logic device that fetches, decodes, and executes instructions from external memory; it sits at the top of the embedded control hierarchy (microprocessor -> CPU -> processing unit -> semiconductor IC) and provides general-purpose compute resources for systems that need more headroom than a microcontroller offers. The MC68SEC000 family specifically brings full 32-bit internal datapath and 32-bit registers to low-cost designs, while the SEC variant uses static HCMOS design rules to enable clock-stopping for power-critical applications.
Key features of the MC68SEC000FU16 include a 16-bit external data bus with a 24-bit address bus (16 Mbyte linear address space), sixteen 32-bit data and address registers, seven user-visible addressing modes, and direct memory access (DMA) support. The processor supports 56 instruction types, includes a hardware multiply and divide unit, and is binary compatible with the original MC68000 instruction set. The static design lets designers stop the clock indefinitely without losing internal state, simplifying low-power sleep modes and step-debug operation.
From an architectural perspective, the SEC000 variant removes the dynamic bus arbitration features of the original MC68000 in favor of a simplified static interface, which reduces silicon area and power while preserving software compatibility. The 3.3V/5V tolerant I/O ring allows legacy 5V peripherals to coexist with modern 3.3V logic without external level shifters, easing migration of existing MC68000 designs.
Typical applications include industrial controllers, point-of-sale terminals, automotive body and chassis modules, communications peripherals, low-power handheld instruments, and legacy MC68000 socket upgrades where direct replacement is required. Because the SEC000 is pin-for-pin compatible with the EC000, designers can drop it into existing boards as an upgrade path for static or low-power operation.
When designing with this device, ensure that the system clock can be gated cleanly when entering sleep mode to maximize the power benefit of the static core. Validate that the 3.3V/5V I/O configuration matches your peripheral logic levels to avoid contention on shared buses.
This page synthesizes distributor inventory snapshots, drop-in pin-compatible alternatives, and design notes that complement (but do not replace) the NXP/Freescale MC68SEC000 product brief and the M68000 family reference manual.
Drop-in alternatives for MC68SEC000FU16 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC68SEC000FU16 (same form factor and footprint) — differing in Address Bus Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68EC000FU16
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →MC68SEC000FU10
✅ Drop-In📋 Reference alternative (not in catalog)
MC68SEC000CFU16
✅ Drop-In📋 Reference alternative (not in catalog)
MC68SEC000CFU20
✅ Drop-In📋 Reference alternative (not in catalog)
MC68SEC000FU16 Maximum Ratings & Electrical Characteristics
| Core Processor | EC000 (M680x0 family) |
| Number of Cores / Bus Width | 1 Core, 32-bit internal |
| Maximum Clock Speed | 16 MHz |
| External Data Bus Width | 16-bit |
| Address Bus Width | 24-bit (16 Mbyte linear address space) |
| I/O Voltage | 3.3 V / 5.0 V |
| Architecture | Static HCMOS |
| Package / Case | 64-QFP (14x14 mm), designation FU16 |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| Lead Free Status | Contains Lead |
| RoHS Status | RoHS Non-Compliant |
| Instruction Set | M68000 binary compatible, 56 instruction types |
| Addressing Modes | 7 user-visible |
| General Purpose Registers | Sixteen 32-bit data and address registers |
| DMA Support | Yes |
| Co-Processor / DSP | None |
| Graphics Acceleration | No |
| Ethernet / SATA / USB | None (external peripherals required) |
MC68SEC000FU16 64-qfp (14x14 mm), designation fu16 Pin Configuration Guide
Pin configuration for MC68SEC000FU16 (64-qfp (14x14 mm), designation fu16 package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC68SEC000FU16.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68SEC000FU16 is suitable for 6 applications: Industrial Automation Controllers, Point-of-Sale Terminals, Automotive Body and Chassis Modules, Legacy MC68000 Socket Upgrades, Communications Peripherals, Low-Power Handheld Instruments.
Industrial Automation Controllers
The MC68SEC000FU16's 16 MHz 32-bit core delivers the deterministic compute needed for PLC scan loops, motor control sequencing, and HMI data processing. Its 16 Mbyte address space accommodates large ladder-logic tables and recipe storage without external memory management. The 3.3V/5V tolerant I/O simplifies interfacing to legacy industrial peripherals such as 5V opto-isolated I/O modules and 5V analog front ends, eliminating level shifters. Static HCMOS operation enables clock-stopping between scan cycles, reducing average power in panel-mount controllers. The M68000 instruction set remains in widespread use in legacy industrial firmware, easing migration from MC68000 designs.
Recommended
Point-of-Sale Terminals
POS terminals demand 32-bit processing for transaction handling, encryption, and printer control while running on tight power and thermal budgets. The MC68SEC000FU16's 16 MHz clock and 32-bit internal datapath support cipher routines and ISO 7816 smart-card protocols efficiently. The 16-bit external data bus minimizes pin count versus a 32-bit external design, keeping the 64-QFP package small enough for compact terminal enclosures. Static operation lets the terminal enter low-power states between customer interactions, extending battery life in mobile POS units. Lead-free equivalent selection is recommended for new retail designs that must meet RoHS.
Recommended
Automotive Body and Chassis Modules
Automotive body controllers for lighting, door modules, and HVAC need deterministic real-time response without the cost of a 32-bit microcontroller. The MC68SEC000FU16's 16 MHz 32-bit core handles CAN message processing, PWM control loops, and diagnostic UDS services with predictable latency. The 24-bit address bus supports large calibration tables for vehicle variants. The 64-QFP package is well suited to automotive PCB form factors and is compatible with existing automotive assembly lines. Designers targeting automotive should qualify the part to the appropriate AEC temperature grade or use the CFU16/CFU20 industrial variant.
Recommended
Legacy MC68000 Socket Upgrades
Many legacy systems use the original MC68000 or MC68EC000 in 64-pin DIP or PLCC packages; the MC68SEC000FU16 offers a direct replacement path for designs migrating to surface mount. Pin-for-pin compatibility with the EC000, as documented in the NXP product brief, lets engineers swap parts on the same PCB without layout rework. The static HCMOS core provides clock-stop capability not present in the original dynamic MC68000, enabling new low-power operating modes in legacy systems. Software written for the original M68000 instruction set runs unmodified, preserving firmware investments.
Recommended
Communications Peripherals
Communications peripherals such as protocol bridges, RS-232/485 gateways, and basic networking equipment benefit from the MC68SEC000FU16's 32-bit processing headroom for protocol stacks. The 16 MHz clock is sufficient for V.24bis error correction, HDLC framing, and small TCP/IP offload tasks. The 64-QFP package is compact enough for embedded peripheral modules that plug into larger backplane systems. Static operation enables power-down during link-idle periods, meeting energy-efficiency targets for always-on communications gear. Lead-free successor parts should be evaluated for new telecom designs.
Recommended
Low-Power Handheld Instruments
Handheld test instruments, data loggers, and portable diagnostic tools benefit from the MC68SEC000FU16's static HCMOS design. Stopping the clock between measurement acquisitions drops average power dramatically, extending battery life in field-deployed instruments. The 32-bit internal datapath enables fast DSP-like math for signal averaging and FFT preprocessing in scope and DMM designs. The 16-bit external data bus keeps the 64-QFP small enough for handheld enclosures while still providing 16 Mbyte address reach for data buffering. Industrial temperature variants (CFU16) suit outdoor and laboratory environments.
Recommended
Recommended Products Summary
Engineering reference data for MC68SEC000FU16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68EC000FU16 | MC68SEC000FU10 | MC68SEC000CFU16 | MC68SEC000CFU20 |
|---|---|---|---|---|---|
| Brand | Freescale Semiconductor | Freescale Semiconductor | Freescale Semiconductor | Freescale Semiconductor | Freescale Semiconductor |
| Package | 64-QFP (FU16, 14x14 mm) | 64-QFP (FU16, 14x14 mm) - same | 64-QFP (FU10 family, 14x14 mm) - same footprint | 64-QFP (CFU16, 14x14 mm) - same | 64-QFP (CFU20, 14x14 mm) - same |
| Maximum Clock Speed | 16 MHz | 16 MHz | 10 MHz (-37.5%) | 16 MHz | 20 MHz (+25%) |
| Static Clock-Stopping | Yes (static HCMOS) | No | Yes | Yes | Yes |
| I/O Voltage | 3.3 V / 5.0 V | 3.3 V / 5.0 V | 3.3 V / 5.0 V | 3.3 V / 5.0 V | 3.3 V / 5.0 V |
| External Data Bus | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Address Bus Width | 24-bit (16 Mbyte) | 24-bit (16 Mbyte) | 24-bit (16 Mbyte) | 24-bit (16 Mbyte) | 24-bit (16 Mbyte) |
| Instruction Set | M68000 (56 instructions) | M68000 (56 instructions) | M68000 (56 instructions) | M68000 (56 instructions) | M68000 (56 instructions) |
| RoHS Status | Non-Compliant (contains lead) | Non-Compliant (contains lead) | Non-Compliant (contains lead) | Non-Compliant (contains lead) | Non-Compliant (contains lead) |
Key Differentiators
- Static HCMOS clock-stopping (vs MC68EC000FU16)
- 16 MHz maximum clock speed in standard FU16 grade (vs MC68SEC000FU10)
- Standard commercial temperature grade in FU16 designation (vs MC68SEC000CFU16)
Design Notes
The MC68SEC000FU16's static HCMOS design allows the system clock to be stopped indefinitely while preserving internal register state, which is essential for low-power sleep modes. To maximize power savings, gate the clock at the source (the oscillator or clock driver) rather than relying on internal clock-divide modes. When waking from sleep, allow at least four clock cycles for the internal pipeline to refill before resuming code execution. Designers using the SEC variant in battery-powered designs can typically see 80-95% quiescent current reduction during clock-stopped sleep.
The 64-QFP (14x14 mm) package has 0.8 mm pitch leads that require careful PCB layout: use a fine-pitch solder paste stencil (0.15 mm thickness recommended) and reflow profile compatible with lead-based QFP packages (peak 220-235 C). Place 0.1 uF decoupling capacitors as close as possible to each VDD/VSS pair. Maintain a continuous ground plane beneath the package to provide a low-impedance return path for the 16-bit external data bus switching at 16 MHz. Differential pair routing is not required for the M68000 bus at this clock rate.
Do not assume the MC68SEC000FU16 is RoHS compliant; per Digchip specifications it contains lead. For new designs targeting RoHS, evaluate ColdFire MCF5208 or other lead-free successors. Also note that the FU16 suffix designates tray packaging - if reel packaging is required for SMT assembly, verify the alternate suffix (typically R or RL) with the supplier. The part is listed as Obsolete by NXP/Freescale, so always confirm lifecycle status and last-time-buy windows before committing to long-life programs.
Compliance Information
Contains lead per Digchip specifications; RoHS non-compliant. REACH, halogen, and conflict minerals status not published by NXP/Freescale for this legacy part.
