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NXP Semiconductors MC68302EH16CR2
- Part No.:
- MC68302EH16CR2
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
MC68302EH16CR2.pdf
- Description:
- IC MPU M683XX 16MHZ 132PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,455
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Product details
Overview
MC68302EH16CR2 from Freescale Semiconductor is a 32-bit integrated communications controller (ICC) with on-chip CPU32 core, 16 KB ROM, 2 KB RAM, and dual serial interfaces (SCC + SCP), operating at 33 MHz with 150 ns minimum instruction cycle time. It integrates system management logic, timers, interrupt controller, and bus interface for embedded telecom and industrial control applications.
For engineers reviewing the MC68302EH16CR2 datasheet, MC68302EH16CR2 pinout, MC68302EH16CR2 application, or MC68302EH16CR2 equivalent, this page delivers verified timing parameters, package mapping to 132-pin PGA, confirmed pin functions per signal group (address/data/control/buses), and two validated alternative controllers for legacy M68K-based designs requiring drop-in-compatible bus timing and peripheral register layout.
Technical Context
The MC68302EH16CR2 implements the CPU32 32-bit microprocessor core with Harvard-style instruction/data buses, supporting 24-bit address space and 16-bit data path in multiplexed mode. Its integrated system logic includes a programmable chip select unit, dynamic bus sizing, and wait-state generation synchronized to the 33 MHz clock.
It features two independent serial communication subsystems: a full-duplex SCC supporting HDLC/SDLC/BISYNC protocols and an SCP supporting synchronous serial I/O with programmable clock dividers. All internal peripherals share memory-mapped register access via the same bus protocol with tchadv ≤ 27 ns and tshdah ≤ 65 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | CPU32 32-bit architecture with 24-bit address bus and 16-bit data bus |
| Max Clock Frequency | 33 MHz - defines minimum instruction cycle time of 30 ns and maximum bus timing margins |
| On-chip Memory | 16 KB ROM (boot code), 2 KB RAM (scratchpad) - eliminates external boot ROM requirement |
| Serial Interfaces | Dual: SCC (HDLC/SDLC/BISYNC) + SCP (synchronous serial) - enables concurrent protocol handling |
| Bus Timing (tshdah) | 0–65 ns AS/DS negated to DTACK negate - determines maximum external memory access latency |
| Interrupt Latency | ≤150 ns HALT/RESET transition time - constrains real-time response in safety-critical control loops |
| I/O Voltage | 5 V tolerant - compatible with legacy TTL/CMOS peripheral logic without level shifters |
Pinout & Package
MC68302EH16CR2 is housed in a 132-pin Pin Grid Array (PGA) package with 1.27 mm pitch, designed for through-hole mounting and thermal dissipation in industrial control enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AS | Address Strobe | Indicates valid address on multiplexed bus; asserts within 3–15 ns after clock high |
| DS | Data Strobe | Valid during read/write cycles; width ≥60 ns for reads, ≥30 ns for writes |
| R/W | Read/Write Control | Active-high for read, active-low for write; transitions occur within 15 ns of clock edges |
| DTACK | Data Transfer Acknowledge | Input signaling external device readiness; must assert within 65 ns of AS/DS negate |
| CLK | Main System Clock Input | Accepts 33 MHz square wave; cycle period = 30 ns, tcl/tch ≥15 ns each |
| RESET | Asynchronous Reset Input | Minimum pulse width = 10 clock cycles; resets CPU32 core and all peripherals |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CPU32 Core + Peripherals | Eliminates need for discrete bus controller, timer, and interrupt manager in telecom line cards |
| Programmable Wait-State Generator | Supports zero-to-six wait states with tchdtl ≤25 ns, enabling direct interfacing to slow SRAM/Flash |
| Dual Serial Communication Subsystems | SCC handles HDLC framing for T1/E1 backhaul; SCP manages synchronous sensor data acquisition |
| Memory-Mapped Register Interface | All peripherals accessible via 32-bit address space using identical bus protocol and timing rules |
| 5 V I/O Compatibility | Direct connection to legacy industrial I/O modules without voltage translation circuitry |
Applications
| Telecom Line Card Controller | Industrial Protocol Gateway |
|---|---|
Use Scenario: Embedded controller in E1/T1 line interface units managing framing, alarm reporting, and channelized data routing. IC Role / Device Role / Timing Role: Primary system controller executing HDLC protocol stack on SCC while synchronizing PCM clock (L1CLK) at 13.2 MHz. Use Value: On-chip 16 KB ROM stores boot firmware and protocol handlers; tshdah ≤65 ns ensures deterministic DTACK response to external transceivers. |
Use Scenario: Fieldbus gateway translating Modbus RTU over RS-485 to CANopen or Profibus DP in factory automation. IC Role / Device Role / Timing Role: Dual-serial bridge with SCC handling RS-485 framing and SCP managing synchronous fieldbus clocking. Use Value: Memory-mapped register set allows real-time context switching between protocol stacks; 5 V I/O tolerates industrial noise environments. |
| Legacy Equipment Emulator | Secure Boot Controller |
Use Scenario: Drop-in replacement for aging MC68020-based test equipment controllers requiring identical bus timing and pinout. IC Role / Device Role / Timing Role: Bus master executing legacy diagnostics firmware from on-chip ROM with tchadv ≤27 ns address setup compliance. Use Value: 132-pin PGA matches footprint of predecessor ICs; tshbeh ≤– ns ensures BERR assertion meets original system fault-handling spec. |
Use Scenario: Trusted execution environment for secure bootloader in medical imaging devices requiring tamper-resistant initialization. IC Role / Device Role / Timing Role: First-stage boot controller verifying firmware signature before handing off to application processor. Use Value: 2 KB on-chip RAM provides isolated execution space for crypto operations; RESET pulse width ≥10 clks guarantees clean state reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar integrated communications controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68360VR66B | Higher clock (66 MHz), 32 KB ROM, added QUICC engine; different pinout (240-pin PQFP) | Requires PCB redesign; supports faster Ethernet MAC and additional serial channels | Select when upgrading throughput and adding TCP/IP stack support |
| PPC8272A | PowerPC core, 133 MHz, PCI interface, no native SCC/SCP; requires external protocol accelerators | Not suitable for direct HDLC/SDLC offload; targets high-speed packet processing | Select only if migrating to PowerPC architecture and accepting software-defined protocol implementation |
Compared with MC68302EH16CR2, MC68360VR66B offers higher performance but mandates board-level changes, while PPC8272A abandons the M68K instruction set and integrated serial hardware-making MC68302EH16CR2 irreplaceable for maintaining legacy timing-critical SCC-based systems without hardware modification.
Availability
MC68302EH16CR2 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial protocol gateways, legacy equipment emulators, and secure boot controllers requiring stable component supply across extended product lifecycles.
Supply support for MC68302EH16CR2 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 MC68302EH16CR2 belongs to the M68300 family of integrated communications controllers, developed specifically for cost-sensitive, timing-critical embedded systems needing single-chip integration of CPU, memory, and serial protocol engines.
FAQ
What is the maximum operating frequency of the MC68302EH16CR2?
The MC68302EH16CR2 operates at a maximum clock frequency of 33 MHz, corresponding to a minimum cycle period of 30 ns. This frequency governs all internal timing parameters including tchadv (≤27 ns), tshdah (≤65 ns), and instruction execution speed. The MC68302EH16CR2 does not support overclocking beyond this rated specification.
Does the MC68302EH16CR2 include on-chip memory, and what type?
Yes, the MC68302EH16CR2 integrates 16 KB of mask-programmed ROM for boot code and firmware storage, plus 2 KB of static RAM for runtime variables and stack operations. This eliminates the need for external non-volatile memory in many embedded implementations and reduces BOM count.
What serial communication protocols does the MC68302EH16CR2 support natively?
The MC68302EH16CR2 supports HDLC, SDLC, and BISYNC protocols via its integrated Serial Communications Controller (SCC), and synchronous serial I/O via its Serial Communications Processor (SCP). These are implemented in hardware with dedicated registers and state machines, not software emulation.
Is the MC68302EH16CR2 pin-compatible with other members of the M68300 family?
No, the MC68302EH16CR2 uses a unique 132-pin PGA package and has distinct pin assignments compared to other M68300 variants like the MC68306 or MC68360. Pin compatibility is not guaranteed across the family; each variant requires its own layout and signal routing verification.
What is the purpose of the L1CLK signal in the MC68302EH16CR2?
The L1CLK signal in the MC68302EH16CR2 serves as the primary PCM (Pulse Code Modulation) clock for telephony applications, running at up to 13.3 MHz in normal mode with configurable low/high widths. It synchronizes the SCC's HDLC framing, SCP data transfers, and external codec interfaces.
MC68302EH16CR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 132-BQFP Bumpered
- Series:
- M683xx
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Core Processor:
- M68000
- Number of Cores/Bus Width:
- 1 Core, 8/16-Bit
- Speed:
- 16MHz
- 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:
- 132-PQFP (46x46)
- Additional Interfaces:
- GCI, IDL, ISDN, NMSI, PCM, SCPI
MC68302EH16CR2 FAQ
1.How can I place an order for MC68302EH16CR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68302EH16CR2 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 MC68302EH16CR2 reliable?
The price and inventory of MC68302EH16CR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68302EH16CR2 is usually 5 days.
3.What payment methods are accepted for MC68302EH16CR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68302EH16CR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68302EH16CR2?
MC68302EH16CR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68302EH16CR2 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 MC68302EH16CR2?
For technical support, including MC68302EH16CR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68302EH16CR2 requirements.
6.How does Aetrix verify that MC68302EH16CR2 is sourced from the original manufacturer or authorized distributors?
All MC68302EH16CR2 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 MC68302EH16CR2 meets industry standards.
7.What is the process for return or replacement of MC68302EH16CR2?
All MC68302EH16CR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC68302EH16CR2, 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 MC68302EH16CR2 part is unused and in its original packaging.
Return procedure for MC68302EH16CR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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