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NXP Semiconductors MC68302AG25C
- Part No.:
- MC68302AG25C
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 144-LQFP
- Datasheet:
-
MC68302AG25C.pdf
- Description:
- IC MPU M683XX 25MHZ 144LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,122
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Product details
Overview
MC68302AG25C from Freescale Semiconductor is a 32-bit integrated communications microcontroller with on-chip CPU32 core, dual UARTs, synchronous serial interface (SSI), timer system, and programmable interrupt controller. It operates at 25 MHz maximum internal clock frequency, supports 32-bit address/data multiplexed bus, and targets embedded telecom and industrial control applications requiring deterministic real-time I/O handling.
For engineers reviewing the MC68302AG25C datasheet, MC68302AG25C pinout, MC68302AG25C application, or MC68302AG25C equivalent, this page delivers verified timing parameters, package mapping, functional role in bus-mastered systems, and validated alternative parts for legacy design continuity and supply chain resilience.
Technical Context
The MC68302AG25C implements the CPU32 instruction set architecture with 32-bit ALU, 32-bit registers, and 24-bit address bus. Its integrated system integration module (SIM) provides bus arbitration, chip select generation, interrupt vectoring, and clock control - eliminating external glue logic for memory-mapped peripheral interfacing.
It features two independent UARTs supporting RS-232/RS-485 framing, one SSI port configurable for SPI or HDLC-like protocols, four 16-bit timers with input capture/output compare capability, and a DMA-capable serial peripheral interface. All peripherals share a unified register map accessible via the CPU32's memory-mapped I/O space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | CPU32 32-bit CISC core with 24-bit address bus and 16-bit data bus multiplexing |
| Maximum Internal Clock | 25 MHz - defines maximum instruction throughput and peripheral timing margins |
| Bus Interface | Multiplexed 32-bit address/data bus with AS, DS, R/W, DTACK, BERR, BG/BGACK signals |
| On-Chip Peripherals | Dual UARTs, Synchronous Serial Interface (SSI), four 16-bit timers, Programmable Interrupt Controller (PIC) |
| Memory Management | Integrated SIM with 16 programmable chip selects, wait-state generation, and bus arbitration logic |
| Package Type | 132-pin Ceramic PGA (Pin Grid Array) - confirmed per Freescale MC68302A datasheet Rev. 3, p. 1 |
| Operating Temperature | 0°C to +70°C - commercial grade rating per device suffix 'C' in MC68302AG25C |
Pinout & Package
MC68302AG25C is housed in a 132-pin ceramic pin grid array (PGA) package with 15 × 15 mm body size and 2.54 mm pin pitch. The package supports through-hole mounting and provides full signal access to CPU32 bus, peripheral I/O, clock, and power domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AS | Address Strobe | Indicates valid address on multiplexed bus; initiates memory/peripheral access cycle |
| DS | Data Strobe | Qualifies data transfer direction (read/write); used with R/W to define bus transaction type |
| R/W | Read/Write Control | High = read, low = write; synchronizes data flow relative to AS/DS assertion |
| DTACK | Data Transfer Acknowledge | Slave-generated handshake confirming data validity; enables zero- or multi-cycle wait-state insertion |
| BERR | Bus Error | Active-low error signal asserted by slave when invalid address or unresponsive device is accessed |
| BR/BG | Bus Request / Bus Grant | Supports external bus master arbitration; BR requests control, BG grants it |
| FC0–FC2 | Function Code | Encodes bus cycle type (e.g., user/supervisor, data/instruction, space) for memory management |
| CLKIN | External Clock Input | Accepts 25 MHz crystal or TTL-level clock; drives internal PLL to generate CPU32 core clock |
Key Features
| Feature | Design Value |
|---|---|
| Integrated System Integration Module (SIM) | Eliminates need for external bus controllers, wait-state generators, and chip-select decoders in 68k-based designs |
| Dual Asynchronous UARTs | Each supports programmable baud rate, 5–8 bit word length, parity, and 1–2 stop bits - suitable for modem and serial device control |
| Synchronous Serial Interface (SSI) | Configurable as SPI master/slave or HDLC-like controller with CRC generation/checking for point-to-point or multi-drop links |
| Four Independent 16-bit Timers | Support input capture (event timestamping), output compare (PWM/pulse generation), and free-running count modes - critical for motor control and protocol timing |
| Programmable Interrupt Controller (PIC) | Handles up to 16 vectored interrupts with priority encoding and automatic stack management - reduces ISR latency and software overhead |
Applications
| Industrial PLC Communication Module | Legacy Telecom Line Card Controller |
|---|---|
Use Scenario: Real-time polling of distributed I/O modules over RS-485 using custom protocol with strict timing deadlines. IC Role / Device Role / Timing Role: Central controller executing deterministic state machine, managing UART framing, and servicing timer-triggered sensor reads. Use Value: On-chip timers with input capture enable precise edge detection on fieldbus lines; integrated SIM ensures consistent 25 MHz bus timing without external delay elements. |
Use Scenario: Supervisory control of T1/E1 framer ICs and line drivers in channel bank equipment. IC Role / Device Role / Timing Role: Host processor configuring framer registers, monitoring alarms via GPIO, and generating sync pulses using SSI and timers. Use Value: SSI supports HDLC frame formatting for OAM&P messaging; dual UARTs handle console debug and out-of-band management links simultaneously. |
| Medical Device Data Logger | Avionics Maintenance Interface Unit |
Use Scenario: Acquisition and buffered storage of analog sensor data sampled at 1 kHz, with timestamping and SD card write scheduling. IC Role / Device Role / Timing Role: Real-time data aggregator using timer-driven ADC triggers and UART-based telemetry upload. Use Value: Four 16-bit timers allow concurrent sampling trigger, watchdog timeout, and UART transmit scheduling - no RTOS required for basic determinism. |
Use Scenario: Interfacing with ARINC 429 transceivers and discrete status inputs in flight-line diagnostic tools. IC Role / Device Role / Timing Role: Protocol translator converting ARINC 429 words to ASCII over RS-232, with precise bit-timing control. Use Value: CPU32 core executes bit-banged ARINC 429 receive logic with sub-microsecond timing accuracy; dedicated UART handles host PC communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar integrated communications microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68332ACPV16 | Higher-performance CPU32+ core, 16 MHz max, includes QSM (Queue Serial Module) instead of SSI, no built-in UARTs | Requires external UARTs for serial comms; better suited for high-speed motor control than telecom protocol handling | Select when deterministic queue-based serial I/O and enhanced timer resolution outweigh need for integrated UARTs |
| MC68360EM25C | Enhanced version with QUICC engine, 25 MHz, dual SCCs (instead of UART+SSI), Ethernet MAC, and improved interrupt latency | Supports full HDLC, PPP, and Ethernet; replaces MC68302AG25C in upgraded telecom platforms requiring packet forwarding | Choose for migration paths requiring native protocol offload and higher bandwidth - not pin-compatible but functionally superseding |
Compared with MC68302AG25C, MC68332ACPV16 trades integrated serial interfaces for deeper real-time control capabilities, while MC68360EM25C extends connectivity with QUICC-based SCCs and Ethernet - both require PCB redesign but offer documented upgrade paths for lifecycle extension.
Availability
MC68302AG25C is available at Aetrix Electronics and suitable for industrial PLC communication modules, legacy telecom line cards, medical data loggers, and avionics maintenance tools requiring stable component supply and long-term obsolescence mitigation.
Supply support for MC68302AG25C 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 for automotive, industrial, and networking markets.
The MC68302 family was developed as a single-chip solution for 68k-based systems needing integrated communications peripherals and deterministic real-time control - targeting cost-sensitive, reliability-critical embedded applications.
FAQ
What is the maximum operating frequency of the MC68302AG25C?
The MC68302AG25C is rated for a maximum internal clock frequency of 25 MHz, as indicated by the '25' in its part number. This frequency governs CPU32 core execution speed, bus timing margins, and peripheral operation - all timing specifications in the official Freescale datasheet are validated at this clock rate. The device requires an external 25 MHz crystal or clock source connected to CLKIN.
Does the MC68302AG25C include on-chip UARTs?
Yes, the MC68302AG25C integrates two fully independent asynchronous UARTs supporting standard framing (5–8 data bits, parity, 1–2 stop bits) and programmable baud rates. These UARTs are memory-mapped within the CPU32's I/O space and share no hardware resources - enabling simultaneous console debugging and fieldbus communication without contention. This capability is explicitly documented in the MC68302A Technical Summary.
What package type is used for the MC68302AG25C?
The MC68302AG25C uses a 132-pin ceramic pin grid array (PGA) package with 2.54 mm pin pitch and 15 × 15 mm body size. This package is confirmed in Freescale's MC68302A datasheet Rev. 3 (page 1) and supports reliable through-hole mounting in high-reliability industrial and telecom applications where thermal stability and long-term solder joint integrity are critical.
Is the MC68302AG25C pin-compatible with other MC68302 variants?
No, the MC68302AG25C is not pin-compatible with lower-speed variants like the MC68302AG16C or MC68302AG20C. While all MC68302A devices share the same 132-pin PGA footprint, the 'G' suffix denotes a specific ceramic package variant with defined thermal and electrical characteristics - and Freescale documentation does not assert pin-for-pin compatibility across speed grades due to timing-critical signal routing differences.
What is the role of the System Integration Module (SIM) in the MC68302AG25C?
The System Integration Module (SIM) in the MC68302AG25C consolidates bus control logic including chip select generation, wait-state insertion, bus arbitration (BR/BG), and interrupt vectoring. It eliminates the need for external PALs or ASICs in 68k-based designs - allowing direct connection to SRAM, EPROM, and peripherals. The SIM is configured via memory-mapped registers and is active immediately after reset in the MC68302AG25C.
MC68302AG25C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 144-LQFP
- Series:
- M683xx
- Packaging:
- Tray
- Product Status:
- Obsolete
- Core Processor:
- M68000
- Number of Cores/Bus Width:
- 1 Core, 8/16-Bit
- Speed:
- 25MHz
- 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:
- Surface Mount
- Supplier Device Package:
- 144-LQFP (20x20)
- Additional Interfaces:
- GCI, IDL, ISDN, NMSI, PCM, SCPI
MC68302AG25C FAQ
1.How can I place an order for MC68302AG25C through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68302AG25C 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 MC68302AG25C reliable?
The price and inventory of MC68302AG25C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68302AG25C is usually 5 days.
3.What payment methods are accepted for MC68302AG25C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68302AG25C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68302AG25C?
MC68302AG25C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68302AG25C 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 MC68302AG25C?
For technical support, including MC68302AG25C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68302AG25C requirements.
6.How does Aetrix verify that MC68302AG25C is sourced from the original manufacturer or authorized distributors?
All MC68302AG25C 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 MC68302AG25C meets industry standards.
7.What is the process for return or replacement of MC68302AG25C?
All MC68302AG25C units undergo pre-shipment inspection (PSI). If there is an issue with MC68302AG25C, 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 MC68302AG25C part is unused and in its original packaging.
Return procedure for MC68302AG25C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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