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NXP Semiconductors MC68EN302PV25BT
- Part No.:
- MC68EN302PV25BT
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 144-LQFP
- Datasheet:
-
MC68EN302PV25BT.pdf
- Description:
- IC MPU M683XX 25MHZ 144LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,242
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Product details
Overview
MC68EN302PV25BT from Freescale is a 25 MHz, 5 V integrated multiprotocol processor with IEEE 802.3-compliant Ethernet controller, DRAM controller, and three SCC serial channels - all on a single 144-pin TQFP die. It extends the MC68302 architecture with full-duplex 10 Mbps Ethernet, dual 128-byte FIFOs, and JTAG-compliant IEEE 1149.1 test support for embedded bridge/router designs.
For engineers reviewing the MC68EN302PV25BT datasheet, MC68EN302PV25BT pinout, MC68EN302PV25BT application, or MC68EN302PV25BT equivalent, key selection criteria include its 25 MHz operation, 144-pin TQFP package, 16-bit Ethernet interface, DRAM bank control, and compatibility with the MC68302 programming model in low-end networking systems.
Technical Context
The MC68EN302PV25BT integrates a 68000-compatible microcoded core with four independent serial interfaces: three legacy SCCs plus a dedicated Ethernet channel implementing full IEEE 802.3 MAC layer functions. Its Ethernet controller uses two dedicated DMA channels, 128 internal buffer descriptors, and a 64-entry CAM with hash option for address filtering.
The DRAM controller supports two banks (RAS0/RAS1, CAS0/CAS1), programmable wait states (0 at 25 MHz with 80 ns DRAM), and hidden refresh - while the module bus controller handles interrupt routing for Ethernet and DRAM blocks and coordinates bus mastership between internal and external sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clock Frequency | 25 MHz maximum operation - enables deterministic timing for Ethernet frame handling and DRAM access at zero wait states with 80 ns DRAM. |
| Ethernet Data Rate | 10 Mbps baseband (20 Mbps full-duplex) - meets IEEE 802.3 compliance for twisted-pair/AUI physical layers via 68160 EEST interface. |
| FIFO Depth | 128 bytes transmit + 128 bytes receive - decouples CPU bus latency from packet transmission/reception, enabling collision-free back-to-back frame handling. |
| DRAM Support | Two independent banks, 128 KB–8 MB per bank - allows flexible memory partitioning for code, packet buffers, and descriptor tables without external glue logic. |
| JTAG Compliance | Fully IEEE 1149.1 compliant - enables boundary-scan testing, debug access, and in-circuit emulation without requiring additional test circuitry. |
| Serial Interfaces | Three SCCs + one Ethernet channel - provides four independent serial data paths for ISDN-to-Ethernet bridging, remote dial-in gateways, or WAN/LAN aggregation. |
Pinout & Package
MC68EN302PV25BT is housed in a 144-lead thin quad flat pack (TQFP) with 0.5 mm lead pitch, designed for surface-mount assembly and thermal performance up to 70°C ambient. The package supports standard PCB reflow profiles and includes dedicated pins for Ethernet (RX/TX/RENA/CLSN/TENA/TCLK), DRAM control (RAS0/RAS1/CAS0/CAS1/DRAMRW), and system bus arbitration (BR/BG/BGACK).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RX / TX | Ethernet physical layer interface | Differential receive/transmit signals for 10BASE-T or AUI media; require external transceiver (e.g., 68160 EEST). |
| RENA / TENA | Ethernet enable control | Active-high enables receiver/transmitter; synchronized with internal state machine to prevent partial frame corruption. |
| CLSN / TCLK / RCLK | Ethernet collision & clock control | Collision detection output; transmit/receive clock inputs derived from external crystal or system clock domain. |
| RAS0 / RAS1 / CAS0 / CAS1 | DRAM bank addressing | Independent row/column address strobes for dual-bank DRAM - allow interleaved access and hidden refresh during active cycles. |
| DTACK / AS / LDS / UDS | 68000 bus handshake | Standard Motorola 68000 asynchronous bus timing signals - ensure glueless interfacing with legacy peripherals and memory controllers. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip descriptor RAM | 1152-byte dual-port RAM stores 128 Ethernet buffer descriptors - eliminates external SRAM and reduces DMA setup overhead. |
| Automatic collision handling | Internal retransmission and FIFO flush during collisions - removes CPU intervention and preserves bus bandwidth for other peripherals. |
| Dynamic bus sizing | Supports 8-bit peripheral devices on 16-bit bus via chip select logic - enables mixed-width system design without address decoding complexity. |
| Glueless DRAM interface | No external bus master required - DRAM controller generates RAS/CAS, refresh, and address muxing internally for direct connection to standard DRAM arrays. |
| Full-duplex Ethernet mode | 20 Mbps aggregate throughput - allows simultaneous transmit/receive without carrier sense contention, ideal for switched LAN edge nodes. |
Applications
| ISDN-to-Ethernet Router | Remote Dial-In Access Server |
|---|---|
Use Scenario: Converting ISDN B-channel traffic into Ethernet frames for integration into corporate LANs. IC Role / Device Role / Timing Role: Primary protocol translation engine using SCCs for ISDN framing and Ethernet controller for 802.3 encapsulation. Use Value: Eliminates need for separate ISDN and Ethernet controllers - reduces BOM cost and board space while maintaining deterministic 10 Mbps forwarding latency. | Use Scenario: Enabling analog modem connections to Ethernet LANs for remote worker access. IC Role / Device Role / Timing Role: Serial-to-Ethernet gateway with SCC-based modem control and Ethernet MAC/PHY interface. Use Value: Supports simultaneous dial-up sessions and LAN packet forwarding using shared DRAM buffers and dual DMA channels. |
| Low-End Network Bridge | Industrial Communication Controller |
Use Scenario: Transparently forwarding frames between two Ethernet segments or between Ethernet and serial fieldbus networks. IC Role / Device Role / Timing Role: Layer-2 bridging processor with hardware-accelerated address learning (64-entry CAM) and store-and-forward buffering. Use Value: Achieves sub-100 µs inter-segment latency with no CPU polling - critical for deterministic industrial network segmentation. | Use Scenario: Managing distributed I/O over RS-485/RS-232 while reporting status to central SCADA via Ethernet. IC Role / Device Role / Timing Role: Real-time communication hub coordinating three SCCs for fieldbus protocols and Ethernet for upstream telemetry. Use Value: Integrates time-critical serial control and best-effort Ethernet reporting in one device - avoids dual-processor synchronization issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar integrated multiprotocol processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68302FC16B | Lacks integrated Ethernet controller and DRAM controller; operates at 16 MHz; uses 132-pin PQFP package. | Suitable only for serial-only applications requiring no LAN connectivity or external DRAM management. | Select when Ethernet functionality is unnecessary and cost-sensitive designs prioritize mature, widely supported silicon. |
| MC68360VR33B | Includes QUICC engine with enhanced Ethernet (10/100 Mbps), but no DRAM controller; 33 MHz operation; 240-pin PBGA package. | Targets higher-throughput routers and requires external SDRAM controller; lacks native DRAM bank control and parity support. | Choose for scalable 100 Mbps upgrades where external memory management is acceptable and board area permits larger package. |
Compared with MC68302FC16B and MC68360VR33B, the MC68EN302PV25BT uniquely combines Ethernet + DRAM control in a compact 144-pin TQFP at 25 MHz - making it optimal for cost-constrained, space-limited embedded bridges where both LAN connectivity and local memory management must be integrated.
Availability
MC68EN302PV25BT is available at Aetrix Electronics and suitable for low-end bridges, remote LAN access points, and industrial communication controllers requiring stable component supply and long-term obsolescence planning.
Supply support for MC68EN302PV25BT 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 MC68EN302PV25BT belongs to Freescale's 68K-family integrated communications processors, designed specifically to extend the MC68302 platform with Ethernet and DRAM capabilities for cost-sensitive networking edge devices.
FAQ
What is the maximum operating frequency of the MC68EN302PV25BT?
The MC68EN302PV25BT is rated for 25 MHz operation under 5 V supply and 0°C to 70°C ambient conditions. This speed enables zero-wait-state DRAM access with 80 ns parts and deterministic Ethernet frame processing at 10 Mbps. The "25" in the part number explicitly denotes this frequency grade, and timing margins are validated per Freescale's MC68EN302 Addendum documentation.
Does the MC68EN302PV25BT include an integrated Ethernet PHY?
No, the MC68EN302PV25BT contains only the Ethernet MAC layer and controller logic - not a physical layer transceiver. It requires an external PHY or EEST device such as the MC68160 for twisted-pair or AUI media interface. The RX/TX pins are digital MAC outputs that must be conditioned and level-shifted before connecting to physical media.
How many DRAM banks does the MC68EN302PV25BT support, and what are the size limits?
The MC68EN302PV25BT supports two independent DRAM banks via RAS0/RAS1 and CAS0/CAS1 signals. Each bank is programmable from 128 KB to 8 MB in discrete steps, allowing asymmetric memory allocation - for example, 2 MB for packet buffers and 4 MB for application code. Bank sizes are configured through dedicated mode registers accessible via the 68000 bus.
Is the MC68EN302PV25BT pin-compatible with the standard MC68302?
No, the MC68EN302PV25BT is not pin-compatible with the MC68302 due to added Ethernet, DRAM, and JTAG signals - expanding from 132-pin PQFP (MC68302) to 144-pin TQFP. Pin assignments differ significantly: e.g., RAS0/CAS0 appear on new pins (PA7/PB0), and Ethernet-specific signals (RX/TX/RENA) occupy previously unused locations. Board redesign is required for migration.
What debugging interfaces does the MC68EN302PV25BT provide?
The MC68EN302PV25BT provides full IEEE 1149.1 JTAG boundary-scan support via TMS, TCK, TDI, TDO, TRST, and TDO pins - enabling structural testing, flash programming, and real-time debug access without halting CPU execution. It does not include BDM (Background Debug Mode) like later ColdFire derivatives; JTAG is the sole standardized debug interface defined for this device.
MC68EN302PV25BT 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:
- 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:
- 144-LQFP (20x20)
- Additional Interfaces:
- GCI, IDL, ISDN, NMSI, PCM, SCPI
MC68EN302PV25BT FAQ
1.How can I place an order for MC68EN302PV25BT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68EN302PV25BT 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 MC68EN302PV25BT reliable?
The price and inventory of MC68EN302PV25BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68EN302PV25BT is usually 5 days.
3.What payment methods are accepted for MC68EN302PV25BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68EN302PV25BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68EN302PV25BT?
MC68EN302PV25BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68EN302PV25BT 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 MC68EN302PV25BT?
For technical support, including MC68EN302PV25BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68EN302PV25BT requirements.
6.How does Aetrix verify that MC68EN302PV25BT is sourced from the original manufacturer or authorized distributors?
All MC68EN302PV25BT 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 MC68EN302PV25BT meets industry standards.
7.What is the process for return or replacement of MC68EN302PV25BT?
All MC68EN302PV25BT units undergo pre-shipment inspection (PSI). If there is an issue with MC68EN302PV25BT, 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 MC68EN302PV25BT part is unused and in its original packaging.
Return procedure for MC68EN302PV25BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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