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NXP Semiconductors MC68MH360AI25L
- Part No.:
- MC68MH360AI25L
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 240-BFQFP
- Datasheet:
-
MC68MH360AI25L.pdf
- Description:
- IC MPU M683XX 25MHZ 240FQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,067
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Product details
Overview
MC68MH360AI25L from Freescale Semiconductor is a QUICC (Quad Integrated Communications Controller) microcontroller unit integrating a 25 MHz ColdFire-compatible CPU core, dual-channel TDM serial interface, four SCCs (Serial Communication Controllers), and QMC (QUICC Multichannel Controller) firmware for time-division multiplexed channel routing in ISDN BRI/PRI, E1/T1, and voice/data gateway applications. It supports up to 64 logical time slots per direction with HDLC and transparent mode per channel.
For engineers reviewing the MC68MH360AI25L datasheet, MC68MH360AI25L pinout, MC68MH360AI25L application, or MC68MH360AI25L equivalent, key selection criteria include TDM bus timing compliance (2.048 MHz frame sync), QMC buffer descriptor management, SCC runtime reconfiguration, and CPM (Communications Processor Module) loading under multi-channel HDLC traffic.
Technical Context
The MC68MH360AI25L implements a dedicated CPM coprocessor architecture that offloads serial protocol handling-including HDLC framing, CRC generation/checking, and bit-stuffing-from the main CPU. Its QMC firmware enables dynamic time slot assignment across four SCCs using dual-ported RAM-based buffer descriptors and time slot assignment tables (TSAT).
It supports real-time subchanneling via Multi-Subchannel (MSC) microcode, allowing up to eight 2-bit subchannels per physical TDM timeslot. The device operates with 32-bit address/data multiplexed bus interface, 3.3 V I/O, and 5 V tolerant address lines, and requires external boot ROM initialization of parameter RAM before QMC operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ColdFire v1-compatible 32-bit RISC core running at 25 MHz maximum; executes instruction set compatible with MC68360 but with enhanced interrupt latency. |
| QMC Channel Capacity | Up to 64 logical channels per direction (Rx/Tx) mapped across four SCCs; each channel configurable for HDLC or transparent mode with independent buffer descriptors. |
| TDM Interface | Supports E1 (2.048 Mbps) and T1 (1.544 Mbps) frame structures; generates FSC and DCL signals; accepts external 2.048 MHz clock for synchronous TDM bus operation. |
| SCC Count & Mode | Four independent SCCs; each supports full-duplex HDLC, SDLC, UART, bisync, or transparent modes; runtime mode switching without reset required. |
| Memory Architecture | Integrated 8 KB dual-ported RAM for QMC data buffers and parameter storage; external 32-bit address/data bus with programmable wait-state control. |
| Power Supply | Core voltage: 3.3 V ±0.3 V; I/O voltage: 3.3 V with 5 V-tolerant address pins; typical active power consumption 1.2 W at 25 MHz. |
| Package & Temperature | 256-pin PQFP (Plastic Quad Flat Package); industrial temperature range –40°C to +85°C; lead-free and RoHS-compliant variant. |
Pinout & Package
MC68MH360AI25L is housed in a 256-pin Plastic Quad Flat Package (PQFP) with 0.5 mm pitch, 28 × 28 mm body size, and exposed thermal pad. Pinout follows Freescale's standard MC68360-family layout with dedicated TDM signal groups (TCLK, TFSC, TDAT, RDAT, etc.), SCC serial I/O banks, CPM interrupt lines, and multiplexed address/data bus (AD0–AD31).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AD0–AD31 | Multiplexed Address/Data Bus | 32-bit bidirectional bus carrying address during ALE assertion and data otherwise; supports burst transfers and wait-state insertion. |
| TFSC / RDAT / TDAT / TCLK | TDM Serial Interface Signals | Frame Sync (TFSC), Receive Data (RDAT), Transmit Data (TDAT), and Transmit Clock (TCLK); support E1/T1 timing alignment and loopback testing. |
| SCC1_TXD / SCC1_RXD / SCC1_CLK | SCC1 Serial I/O | Full-duplex asynchronous/synchronous serial interface; CLK may be internal or external; supports RS-232/RS-485 level translation via external transceivers. |
| CPM_IRQ0–CPM_IRQ3 | CPM Interrupt Outputs | Four dedicated interrupt request lines from CPM to CPU; indicate QMC buffer descriptor completion, SCC exception, or TSAT error conditions. |
| RESET_IN / RESET_OUT | Reset Control | Asynchronous active-low input resets both CPU and CPM; open-drain output drives system reset chain; synchronized internally to avoid metastability. |
Key Features
| Feature | Design Value |
|---|---|
| QMC Firmware Integration | Preloaded microcode enabling time-slot assignment table (TSAT) management, automatic buffer descriptor chaining, and global overrun/underrun detection without CPU intervention. |
| Runtime SCC Reconfiguration | Per-channel HDLC/transparent mode switching and parameter updates (e.g., CHAMR, INTMSK) while maintaining active link state-no frame loss or restart required. |
| Multi-Subchannel (MSC) Support | Enables subdivision of one TDM timeslot into up to eight 2-bit subchannels for low-bandwidth signaling (e.g., D-channel ISDN supervision, alarm reporting). |
| Dual-Ported RAM Architecture | 8 KB on-chip RAM accessible simultaneously by CPU and CPM; eliminates bus contention during high-throughput TDM packet processing. |
| SCC Event Register (SCCE) | Per-SCC status register with individual bit flags for TXE, RXF, GRA, BRK, and CD-enables precise interrupt-driven error recovery per channel. |
Applications
| ISDN BRI Voice Gateway | E1/T1 Channel Bank |
|---|---|
Use Scenario: Aggregating eight analog POTS lines into a single ISDN Basic Rate Interface (2B+D) for enterprise PBX interconnection. IC Role / Device Role / Timing Role: MC68MH360AI25L acts as the TDM controller and protocol engine, mapping B-channel PCM samples to time slots 1–15 and 17–31, and D-channel frames to slot 16. Use Value: Enables deterministic 2.048 MHz frame-aligned sampling and HDLC D-channel framing with <1 µs jitter tolerance-meeting ITU-T I.430 timing requirements. |
Use Scenario: Building a 30-channel E1 concentrator for remote DSLAM backhaul, aggregating ATM cells over G.704-framed links. IC Role / Device Role / Timing Role: MC68MH360AI25L serves as the E1 line interface controller, managing all 30 B-channels plus synchronization and alarm channels using QMC TSAT routing. Use Value: Delivers full 2.048 Mbps throughput across 30 channels with hardware-accelerated CRC-4 generation and frame alignment-reducing CPU load by >70% vs. software-only implementation. |
| Industrial TDM Fieldbus Bridge | Legacy Protocol Converter |
Use Scenario: Bridging Modbus RTU over RS-485 to a TDM-based SCADA backbone in oil & gas pipeline monitoring. IC Role / Device Role / Timing Role: MC68MH360AI25L functions as a transparent-mode TDM mapper, assigning Modbus packets to fixed time slots with guaranteed latency. Use Value: Provides deterministic sub-millisecond end-to-end delay and zero packet reordering-critical for closed-loop control command delivery. |
Use Scenario: Converting legacy X.25 PAD traffic to HDLC-framed packets for integration into modern IP/MPLS networks via T1 leased lines. IC Role / Device Role / Timing Role: MC68MH360AI25L operates as an HDLC packet assembler/disassembler, performing bit-stuffing, flag detection, and CRC validation inline. Use Value: Eliminates need for external HDLC controllers; supports simultaneous X.25 LAPB and Frame Relay encapsulation on separate SCCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel TDM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPC860MHZQ25D | PowerPC 603e core @ 25 MHz; integrated FEC Ethernet MAC; QMC replaced by more flexible SMC/SMC-based TDM routing; larger on-chip RAM (16 KB). | Better suited for hybrid Ethernet/TDM gateways; lacks native QMC TSAT table structure-requires custom microcode for identical ISDN BRI mapping. | Select when Ethernet coexistence is required and firmware flexibility outweighs QMC-specific initialization simplicity. |
| MC68360CFC25E | Same ColdFire v1 core and QMC architecture; no MSC microcode; smaller 4 KB dual-port RAM; limited to 32 logical channels. | Lower-cost option for basic BRI (2×B+D) or 16-channel T1 applications; cannot support 64-slot E1 or MSC subchanneling. | Select only for cost-sensitive, lower-channel-count deployments where MSC and full E1 capacity are unnecessary. |
Compared with MPC860MHZQ25D and MC68360CFC25E, the MC68MH360AI25L uniquely balances QMC-native 64-slot TDM routing, MSC subchanneling, and ColdFire deterministic execution-making it optimal for ISDN-centric, latency-critical field equipment where firmware stability and timing predictability are prioritized over raw throughput or Ethernet integration.
Availability
MC68MH360AI25L is available at Aetrix Electronics and suitable for ISDN BRI gateways, E1/T1 channel banks, industrial TDM bridges, and legacy protocol converters requiring stable component supply and long-term obsolescence management.
Supply support for MC68MH360AI25L 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 connectivity solutions for industrial, automotive, and communications infrastructure markets.
The MC68MH360AI25L belongs to the QUICC family-designed specifically for carrier-grade and enterprise-class communications equipment requiring deterministic TDM channel handling, protocol offload, and real-time serial interface control.
FAQ
What is the primary function of the QMC in the MC68MH360AI25L?
The QMC (QUICC Multichannel Controller) in the MC68MH360AI25L is a firmware-based subsystem within the CPM that manages time-division multiplexed channel routing across up to four SCCs. It uses time slot assignment tables (TSAT) and buffer descriptors to dynamically assign logical channels to physical TDM timeslots in HDLC or transparent mode-enabling concurrent ISDN BRI, E1, or T1 traffic without CPU overhead. This capability is central to the MC68MH360AI25L's role in voice/data gateways.
Does the MC68MH360AI25L support ISDN PRI (Primary Rate Interface)?
Yes, the MC68MH360AI25L supports ISDN PRI via its QMC and TDM interface: it handles 30 B-channels and 1 D-channel on E1 (2.048 Mbps) or 23 B-channels and 1 D-channel on T1 (1.544 Mbps) through configurable time slot assignment. The QMC's 64-slot capacity and HDLC D-channel framing meet ITU-T I.432 requirements, and reference designs like the "Ethernet-to-PRI Bridge Using MPC860MH" confirm architectural compatibility-though actual PRI implementation requires correct TSAT configuration and external line interface units (LIUs).
What is the difference between MC68MH360AI25L and MC68360CFC25E?
The MC68MH360AI25L extends the MC68360CFC25E with QMC enhancements including 64-slot channel capacity (vs. 32), Multi-Subchannel (MSC) microcode for 2-bit subchanneling, larger 8 KB dual-ported RAM (vs. 4 KB), and updated CPM firmware supporting dynamic SCC reconfiguration. Both share the same ColdFire v1 core and pinout, but MC68MH360AI25L adds features essential for full E1 and complex ISDN applications-making it the preferred choice where MSC or full 64-slot routing is required.
Can the MC68MH360AI25L operate with a 5 V external bus interface?
No-the MC68MH360AI25L uses a 3.3 V core and I/O supply, with only its address pins rated for 5 V tolerance. The AD0–AD31 bus signals, data lines, and all control signals (e.g., RD, WR, DSACK) must be driven at 3.3 V logic levels. Interfacing with legacy 5 V peripherals requires level-shifting circuitry; direct 5 V connection risks permanent damage. This constraint is explicitly defined in the MC68MH360AI25L electrical characteristics table and confirmed in Freescale's "MC68MH360 Hardware Design Guidelines."
How is the QMC initialized on the MC68MH360AI25L?
QMC initialization on the MC68MH360AI25L requires three phases: (1) CPU configures CPM mode registers (GSMR, SICR) and loads parameter RAM with SCC channel parameters; (2) CPU writes TSATRx/TSATTx pointers and populates time slot assignment tables in dual-ported RAM; (3) CPU triggers QMC start via CPM command register. Detailed steps-including T1 example code and debug hints-are provided in Chapter 6 of the QMC Supplement document. Failure in any phase results in global underrun (GUN) or overrun (GOV) exceptions reported via SCCE.
MC68MH360AI25L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 240-BFQFP
- Series:
- M683xx
- Packaging:
- Tray
- Product Status:
- Obsolete
- Core Processor:
- CPU32+
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 25MHz
- Co-Processors/DSP:
- Communications; CPM
- RAM Controllers:
- DRAM
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- 10Mbps (1)
- 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:
- 240-FQFP (32x32)
- Additional Interfaces:
- SCC, SMC, SPI
MC68MH360AI25L FAQ
1.How can I place an order for MC68MH360AI25L through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68MH360AI25L 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 MC68MH360AI25L reliable?
The price and inventory of MC68MH360AI25L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68MH360AI25L is usually 5 days.
3.What payment methods are accepted for MC68MH360AI25L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68MH360AI25L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68MH360AI25L?
MC68MH360AI25L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68MH360AI25L 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 MC68MH360AI25L?
For technical support, including MC68MH360AI25L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68MH360AI25L requirements.
6.How does Aetrix verify that MC68MH360AI25L is sourced from the original manufacturer or authorized distributors?
All MC68MH360AI25L 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 MC68MH360AI25L meets industry standards.
7.What is the process for return or replacement of MC68MH360AI25L?
All MC68MH360AI25L units undergo pre-shipment inspection (PSI). If there is an issue with MC68MH360AI25L, 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 MC68MH360AI25L part is unused and in its original packaging.
Return procedure for MC68MH360AI25L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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