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NXP Semiconductors MC68LC060RC66
- Part No.:
- MC68LC060RC66
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 206-BPGA
- Datasheet:
-
MC68LC060RC66.pdf
- Description:
- IC MPU M680X0 66MHZ 206PGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
MC68LC060RC66 from Motorola is a 32-bit superscalar microprocessor without integrated FPU or MMU, operating at 66 MHz with on-chip 8 KB instruction and 8 KB data caches, supporting full M68000 family instruction set compatibility for embedded control and industrial computing applications.
For engineers reviewing the MC68LC060RC66 datasheet, MC68LC060RC66 pinout, MC68LC060RC66 application, or MC68LC060RC66 equivalent, key selection criteria include cache coherency support, bus timing compliance (TS/TIP/TA), thermal sensing pins (THERM1/THERM0), and absence of FPU/MMU for cost-optimized deterministic real-time systems.
Technical Context
The MC68LC060RC66 implements dual integer execution pipelines (pOEP/sOEP) with dynamic branch prediction and a 5-stage instruction fetch pipeline (IFP), enabling up to two instructions per cycle under ideal conditions. It supports burst-mode transfers, cacheable/non-cacheable memory access modes, and IEEE 1149.1 JTAG boundary-scan debugging via TCK/TMS/TDI/TDO signals.
Address translation uses two-level hierarchical page tables managed by the ATC (address translation cache), with transparent translation registers (ITTR/DTTx) for fast context switching. Bus arbitration employs BR/BG/BGR signals with programmable bus tenure control, and thermal monitoring is implemented through dedicated THERM0/THERM1 analog output pins calibrated per device.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clock Frequency | 66 MHz - fixed maximum operating frequency requiring external 3.3 V ±5% supply and compatible clock source |
| Instruction Cache | 8 KB unified, 4-way set associative - reduces average instruction fetch latency to ≤2 cycles in cache-hit scenarios |
| Data Cache | 8 KB unified, 4-way set associative - supports writethrough and copyback modes for memory coherency management |
| Address Space | 32-bit linear addressing - supports up to 4 GB physical memory with software-managed virtual-to-physical translation |
| Bus Interface | 32-bit multiplexed address/data bus with TS/TIP/TA handshake protocol - ensures synchronous timing alignment with external memory controllers |
| Thermal Sensing | Dual analog outputs (THERM0/THERM1) - provides calibrated voltage proportional to die temperature for system-level thermal throttling |
| JTAG Support | IEEE 1149.1 compliant TAP controller - enables boundary-scan testing and debug pipe access without halting CPU operation |
Pinout & Package
MC68LC060RC66 is housed in a 241-pin ceramic quad flat pack (CQFP) package with 0.65 mm lead pitch, designed for high-reliability industrial and avionics applications requiring hermetic sealing and extended temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A31–A0 | Address Bus | 32-bit multiplexed address lines latched on rising edge of TS; used for memory and I/O address generation |
| D31–D0 | Data Bus | 32-bit bidirectional data path shared with address bus; requires external transceivers for bus driving |
| TS | Transfer Start | Output strobe indicating start of bus cycle; synchronizes external memory controller timing sequence |
| TIP | Transfer in Progress | Active-high output signaling ongoing bus transfer; used for wait-state insertion and DMA coordination |
| TA | Transfer Acknowledge | Input acknowledging valid data/address setup; determines cycle completion timing and burst continuation |
| THERM0, THERM1 | Thermal Sensor Outputs | Analog voltage outputs (0.5–2.5 V range) calibrated to junction temperature; require external ADC for monitoring |
| JTAG TCK/TMS/TDI/TDO | Test Access Port | IEEE 1149.1 boundary-scan interface; enables non-intrusive structural testing and debug visibility |
Key Features
| Feature | Design Value |
|---|---|
| Superscalar Dual Pipeline | Executes up to two integer instructions per cycle using pOEP/sOEP pipelines, improving throughput in loop-intensive control code |
| Integrated Caches | Separate 8 KB instruction and 8 KB data caches reduce external memory bandwidth demand by >70% in typical embedded workloads |
| No FPU or MMU | Eliminates floating-point and virtual memory overhead, enabling deterministic interrupt latency and simplified RTOS integration |
| Burst Transfer Mode | Supports up to 16-beat burst reads/writes over the 32-bit bus, cutting bus arbitration overhead by 80% for sequential memory access |
| Thermal Monitoring | Dual analog thermal sensor outputs allow real-time die temperature tracking without external sensors or firmware polling |
Applications
| Industrial PLC Controller | Military Avionics Display |
|---|---|
Use Scenario: Real-time motion control logic executing ladder logic and PID loops at 1 kHz update rate in factory automation cabinets. IC Role / Device Role / Timing Role: Primary CPU executing deterministic control tasks with guaranteed worst-case interrupt response < 2.5 µs. Use Value: Absence of FPU/MMU eliminates variable-latency exceptions, ensuring cycle-accurate timing for synchronized I/O updates. | Use Scenario: Raster-based cockpit display processor rendering flight symbology and sensor overlays in MIL-STD-1553B-integrated aircraft systems. IC Role / Device Role / Timing Role: Graphics command processor managing frame buffer DMA and overlay composition with strict jitter constraints. Use Value: Burst-mode bus transfers and 8 KB data cache reduce memory latency for pixel data streaming, sustaining 40 MB/s sustained bandwidth. |
| Railway Signaling System | Medical Imaging Subsystem |
Use Scenario: Fail-safe interlocking logic unit validating track occupancy and switch positions in EN 5012x-certified rail infrastructure. IC Role / Device Role / Timing Role: Safety-critical controller running certified SIL-3 software with hardware-assisted cache locking for critical code sections. Use Value: Cache control register (CACR) allows write-protecting instruction cache lines to prevent corruption during EMI events. | Use Scenario: DICOM image preprocessing engine performing histogram equalization and noise filtering on ultrasound scan data before GPU upload. IC Role / Device Role / Timing Role: Offload processor handling fixed-point signal processing kernels with predictable memory access patterns. Use Value: 32-bit linear addressing and 8 KB instruction cache enable efficient execution of hand-optimized assembly routines without paging overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 32-bit embedded microprocessor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68EC060RC66 | Omits both FPU and MMU like MC68LC060RC66 but adds 256-byte on-chip RAM and removes cache coherency logic | Suitable for ultra-low-cost systems where cache coherency is unnecessary and small local RAM suffices for boot code | Select MC68EC060RC66 only when cache coherency is not required and internal RAM reduces external memory count |
| MC68060RC66 | Includes full FPU and MMU, 16 KB instruction + 16 KB data caches, and higher power consumption (3.3 W vs. 2.1 W) | Required for applications needing IEEE 754 floating-point math or virtual memory management in multitasking OS environments | Choose MC68060RC66 only when FPU/MMU functionality is mandatory; otherwise MC68LC060RC66 offers better power/performance ratio |
Compared with MC68EC060RC66, MC68LC060RC66 provides cache coherency and larger caches for higher throughput in memory-bound control tasks; compared with MC68060RC66, it delivers identical integer performance at lower power and cost by omitting FPU/MMU silicon area.
Availability
MC68LC060RC66 is available at Aetrix Electronics and suitable for industrial PLC controllers, military avionics displays, and railway signaling systems requiring stable component supply across extended product lifecycles.
Supply support for MC68LC060RC66 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
Motorola Semiconductor (now NXP Semiconductors) was a pioneer in 68k architecture microprocessors, delivering high-reliability embedded solutions for aerospace, industrial, and communications markets from the 1970s through early 2000s.
The MC68LC060RC66 belongs to the M68060 family designed for deterministic real-time embedded applications where predictable interrupt latency, cache-controlled memory access, and long-term obsolescence management are critical design requirements.
FAQ
What is the maximum operating frequency of the MC68LC060RC66?
The MC68LC060RC66 is rated for a maximum clock frequency of 66 MHz. This speed is guaranteed under specified voltage (3.3 V ±5%) and temperature (–40°C to +85°C) conditions. Operation above this frequency violates the device's AC timing specifications and may result in undefined behavior or data corruption. The MC68LC060RC66 does not support frequency scaling or dynamic clock adjustment.
Does the MC68LC060RC66 include a floating-point unit (FPU)?
No, the MC68LC060RC66 explicitly omits the floating-point unit present in the full MC68060 variant. This is a defining characteristic of the "LC" (Low-Cost) designation. Floating-point operations must be performed in software using the integer unit, or offloaded to an external coprocessor. The MC68LC060RC66 retains full M68000 instruction set compatibility except for FPU-specific instructions.
How does the MC68LC060RC66 handle memory management without an MMU?
The MC68LC060RC66 lacks a hardware MMU but supports software-managed virtual memory through its address translation cache (ATC) and transparent translation registers (ITTR/DTTx). Memory protection and mapping are implemented in firmware using page table structures defined in the M68060 User's Manual. The MC68LC060RC66 relies on external logic or software for privilege-level enforcement and page fault handling.
What thermal monitoring capability does the MC68LC060RC66 provide?
The MC68LC060RC66 integrates two dedicated analog thermal sensor outputs, THERM0 and THERM1, which deliver calibrated voltage outputs proportional to die temperature. These pins require connection to an external ADC for digitization and do not provide digital temperature readings internally. The MC68LC060RC66 uses these outputs for system-level thermal throttling and safety shutdown, not for on-chip thermal regulation.
Is the MC68LC060RC66 pin-compatible with other M68060 family members?
Yes, the MC68LC060RC66 shares identical pinout and package (241-pin CQFP) with the MC68060RC66 and MC68EC060RC66, enabling direct PCB substitution in many designs. However, functional differences-such as absence of FPU/MMU in MC68LC060RC66 versus their presence in MC68060RC66-require corresponding firmware and system-level validation. The MC68LC060RC66 pinout remains unchanged across all speed grades within the RCxx suffix series.
MC68LC060RC66 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 206-BPGA
- Series:
- M680x0
- Packaging:
- Tray
- Product Status:
- Obsolete
- Core Processor:
- 68060
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 66MHz
- Co-Processors/DSP:
- -
- RAM Controllers:
- -
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- -
- SATA:
- -
- USB:
- -
- Voltage - I/O:
- 3.3V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 206-PGA (47.25x47.25)
- Additional Interfaces:
- SCI, SPI
MC68LC060RC66 FAQ
1.How can I place an order for MC68LC060RC66 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68LC060RC66 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 MC68LC060RC66 reliable?
The price and inventory of MC68LC060RC66 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68LC060RC66 is usually 5 days.
3.What payment methods are accepted for MC68LC060RC66?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68LC060RC66 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68LC060RC66?
MC68LC060RC66 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68LC060RC66 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 MC68LC060RC66?
For technical support, including MC68LC060RC66 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68LC060RC66 requirements.
6.How does Aetrix verify that MC68LC060RC66 is sourced from the original manufacturer or authorized distributors?
All MC68LC060RC66 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 MC68LC060RC66 meets industry standards.
7.What is the process for return or replacement of MC68LC060RC66?
All MC68LC060RC66 units undergo pre-shipment inspection (PSI). If there is an issue with MC68LC060RC66, 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 MC68LC060RC66 part is unused and in its original packaging.
Return procedure for MC68LC060RC66:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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