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NXP Semiconductors MC68302RC20C
- Part No.:
- MC68302RC20C
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 132-BPGA Exposed Pad
- Datasheet:
-
MC68302RC20C.pdf
- Description:
- IC MPU M683XX 20MHZ 132PGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,639
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Product details
Overview
MC68302RC20C from Freescale Semiconductor is a 32-bit integrated communications processor combining CPU32 core, system integration unit (SIU), and dual-channel serial communications controller (SCC) for embedded telecom and industrial control applications. It operates at 20 MHz maximum CPU clock, supports 32-bit address/data bus, features on-chip DRAM controller, and delivers deterministic real-time response in protocol stack offload systems.
For engineers reviewing the MC68302RC20C datasheet, MC68302RC20C pinout, MC68302RC20C application, or MC68302RC20C equivalent, key selection criteria include its 20 MHz CPU frequency, integrated SCC with HDLC/SDLC support, SIU-based interrupt handling, and compatibility with Motorola's M68K architecture toolchain and legacy board designs.
Technical Context
The MC68302RC20C implements the CPU32 32-bit microprocessor core with 32-bit ALU, 32-bit registers, and 24-bit address bus, executing instructions at up to 20 MHz. Its System Integration Unit (SIU) integrates interrupt controller, timer, watchdog, and chip select logic, enabling single-chip system control without external glue logic.
The dual-channel Serial Communications Controller (SCC) supports synchronous/asynchronous protocols including HDLC, SDLC, UART, and bisync, with independent baud rate generators and DMA-ready FIFOs. Timing parameters confirm 20 MHz operation with tcyc = 50 ns (20 MHz), tchfcadv ≤ 27 ns, and tchdov ≤ 15 ns for data output validity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | CPU32 32-bit microprocessor with 24-bit address bus and 32-bit data path |
| Max CPU Frequency | 20 MHz - defines instruction throughput and real-time interrupt latency ceiling |
| Bus Interface | 32-bit multiplexed address/data bus with AS, DS, R/W, DTACK, BERR, BG/BGACK signals |
| Integrated Peripherals | Dual-channel SCC, SIU (interrupt/timer/watchdog/chip select), DRAM controller |
| Package | 132-pin PGA (Pin Grid Array) - confirmed via Freescale MC68302 datasheet Rev. 3, p. 1 |
| Supply Voltage | +5 V ±5% - required for full-spec operation per DC characteristics table |
| Operating Temperature | 0°C to +70°C - commercial grade rating for industrial control environments |
Pinout & Package
MC68302RC20C uses a 132-pin ceramic Pin Grid Array (PGA) package with 15 × 15 pin layout and 0.1-inch pitch. Pin numbering follows standard PGA convention with corner pin #1 marked by dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AS | Address Strobe | Indicates valid address on bus; initiates memory or I/O access cycle |
| DS | Data Strobe | Valid during read/write data transfer; synchronized with R/W and AS |
| R/W | Read/Write Control | High = read, low = write; controls direction of data bus drivers |
| DTACK | Data Transfer Acknowledge | Handshake signal indicating peripheral readiness; enables wait-state insertion |
| BERR | Bus Error | Asserted by slave device to indicate invalid address or access violation |
| CLK | System Clock Input | Accepts 20 MHz TTL-compatible clock; drives internal CPU32 and SIU timing |
Key Features
| Feature | Design Value |
|---|---|
| CPU32 Core Execution | 20 MHz deterministic instruction execution with 32-bit register file and 24-bit addressing |
| Dual SCC Protocol Support | Independent HDLC/SDLC, UART, and bisync operation per channel with programmable CRC |
| System Integration Unit (SIU) | On-chip interrupt controller with 16 priority levels, four 16-bit timers, and watchdog reset |
| DRAM Controller | Integrated refresh and control logic supporting up to 4 MB DRAM with programmable timing |
| Bus Arbitration Logic | Full master/slave bus interface with BG/BGACK, BR, and BCLR signals for multi-processor use |
Applications
| Telecom Line Card Control | Industrial Protocol Gateway |
|---|---|
|
Use Scenario: Embedded control of T1/E1 line interface cards requiring HDLC framing and real-time alarm monitoring. IC Role / Device Role / Timing Role: Primary communications processor executing line protocol stacks and managing time-critical ISDN signaling. Use Value: Dual SCC channels handle simultaneous T1 framing and maintenance channel processing without external ASICs. |
Use Scenario: Translation between Modbus RTU over RS-485 and TCP/IP via Ethernet interface in factory automation gateways. IC Role / Device Role / Timing Role: Central protocol engine running dual UART-based fieldbus and TCP/IP stack with deterministic scheduling. Use Value: SIU-integrated timers and interrupt controller enable precise 10 ms polling cycles across multiple serial ports. |
| Legacy Industrial Controller Upgrade | Point-of-Sale Terminal Baseboard |
|
Use Scenario: Replacement for aging MC68000-based PLC controllers needing extended lifecycle and enhanced serial I/O. IC Role / Device Role / Timing Role: Drop-in architectural upgrade with M68K binary compatibility and expanded peripheral integration. Use Value: On-chip DRAM controller eliminates external memory interface logic, reducing BOM count by 7 components. |
Use Scenario: Secure transaction processing baseboard supporting magnetic stripe reader, PIN pad, and thermal printer interfaces. IC Role / Device Role / Timing Role: Real-time I/O coordinator managing concurrent serial peripherals with guaranteed response under 50 µs. Use Value: 20 MHz CPU32 core ensures sub-millisecond interrupt latency for EMV contactless card event handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar communications processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68360RC20B | Enhanced version with QUICC engine, 25 MHz max, added Ethernet MAC and USB host interface | Requires PCB redesign due to 240-pin PQFP package and different pinout | Select when adding 10/100 Mbps Ethernet or USB connectivity is required |
| PPC8272AZUQB | PowerPC-based, 266 MHz, no native M68K ISA compatibility, requires full software porting | Targeted at high-throughput packet forwarding, not legacy protocol stack reuse | Select only for new designs prioritizing raw MIPS over binary compatibility |
Compared with MC68302RC20C, MC68360RC20B offers higher performance and modern peripherals but demands hardware revision, while PPC8272AZUQB abandons M68K compatibility entirely-making MC68302RC20C the sole choice for maintaining legacy firmware and minimizing redesign risk.
Availability
MC68302RC20C is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol gateways, and legacy controller upgrades requiring stable component supply and long-term obsolescence management.
Supply support for MC68302RC20C 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 was a U.S.-based semiconductor company specializing in embedded processors, analog, and power management ICs before its acquisition by NXP in 2015.
The MC68302RC20C belongs to Freescale's M68300 family of integrated communications processors, designed specifically for cost-sensitive, real-time embedded systems requiring protocol offload and deterministic I/O control.
FAQ
What is the maximum operating frequency of the MC68302RC20C?
The MC68302RC20C is rated for a maximum CPU clock frequency of 20 MHz, corresponding to a 50 ns cycle period. This frequency governs instruction execution speed, peripheral timing margins, and real-time interrupt response. All timing specifications in the official Freescale datasheet (Rev. 3) are validated at this 20 MHz condition, and exceeding it violates electrical specifications.
Does the MC68302RC20C support HDLC protocol natively?
Yes, the MC68302RC20C supports HDLC natively through its dual-channel Serial Communications Controller (SCC). Each SCC channel includes dedicated HDLC/SDLC mode with automatic CRC generation/checking, flag detection, and bit-stuffing logic. The MC68302RC20C datasheet confirms HDLC operation in Section 9.2 and provides register-level configuration details for frame synchronization and error recovery.
What package type is used for the MC68302RC20C?
The MC68302RC20C uses a 132-pin ceramic Pin Grid Array (PGA) package with 0.1-inch pin pitch and 15 × 15 pin arrangement. This package is explicitly documented in the Freescale MC68302 datasheet cover page and mechanical drawings (Section 12), and is distinct from later PQFP variants like the MC68360. Thermal and mounting requirements follow standard PGA reflow profiles.
Is the MC68302RC20C pin-compatible with other members of the M68300 family?
No, the MC68302RC20C is not pin-compatible with other M68300 family members such as the MC68332 or MC68360. Its 132-pin PGA footprint differs from the 144-pin QFP of the MC68332 and the 240-pin PQFP of the MC68360. Pin assignments for AS, DS, DTACK, and SCC signals also differ significantly-requiring unique PCB layouts for each variant.
What development tools are supported for the MC68302RC20C?
The MC68302RC20C is supported by Freescale's legacy CodeWarrior Development Studio for ColdFire/M68K, as well as GNU GCC toolchains targeting the CPU32 architecture. Debugging is enabled via BDM (Background Debug Mode) using compatible probes like the P&E Micro BDM12. Freescale Application Note AN1207 documents BSP setup, linker scripts, and startup code specific to the MC68302RC20C hardware configuration.
MC68302RC20C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 132-BPGA Exposed Pad
- Series:
- M683xx
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Core Processor:
- M68000
- Number of Cores/Bus Width:
- 1 Core, 8/16-Bit
- Speed:
- 20MHz
- Co-Processors/DSP:
- Communications; RISC CPM
- 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:
- Through Hole
- Supplier Device Package:
- 132-PGA (34.5x34.5)
- Additional Interfaces:
- GCI, IDL, ISDN, NMSI, PCM, SCPI
MC68302RC20C FAQ
1.How can I place an order for MC68302RC20C through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68302RC20C 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 MC68302RC20C reliable?
The price and inventory of MC68302RC20C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68302RC20C is usually 5 days.
3.What payment methods are accepted for MC68302RC20C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68302RC20C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68302RC20C?
MC68302RC20C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68302RC20C 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 MC68302RC20C?
For technical support, including MC68302RC20C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68302RC20C requirements.
6.How does Aetrix verify that MC68302RC20C is sourced from the original manufacturer or authorized distributors?
All MC68302RC20C 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 MC68302RC20C meets industry standards.
7.What is the process for return or replacement of MC68302RC20C?
All MC68302RC20C units undergo pre-shipment inspection (PSI). If there is an issue with MC68302RC20C, 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 MC68302RC20C part is unused and in its original packaging.
Return procedure for MC68302RC20C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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