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NXP Semiconductors MC68LC302PU20CT
- Part No.:
- MC68LC302PU20CT
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 100-LQFP
- Datasheet:
-
MC68LC302PU20CT.pdf
- Description:
- IC MPU M683XX 20MHZ 100LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MC68LC302PU20CT from Freescale is a low-cost integrated multiprotocol processor featuring a static 68000 core, two full-duplex serial communication controllers (SCCs), three timers including a watchdog and periodic interrupt timer (PIT), 1152-byte on-chip dual-port RAM, and support for 8-/16-bit bus operation at 20 MHz. It targets embedded control in portable, space-constrained, and low-power systems such as PCMCIA cards and intelligent peripherals.
For engineers reviewing the MC68LC302PU20CT datasheet, MC68LC302PU20CT pinout, MC68LC302PU20CT application, or MC68LC302PU20CT equivalent, key selection considerations include its 100-pin TQFP package, absence of SCC3, reduced external bus arbitration capability, PLL-based 32 kHz/4 MHz clock input support, and dedicated low-power wake-up pins (two GPIO + PIT).
Technical Context
The MC68LC302PU20CT implements a static M68000 CPU core with instruction set compatibility to the M68000 family, enabling 8- or 16-bit system integration without external bus buffers. Its System Integration Block (SIB) integrates an interrupt controller with two operational modes, four chip-select lines with wait-state logic, and programmable address mapping for dual-port RAM and IMP registers.
The Communications Processor (CP) contains a RISC-based main controller and two independent SCCs supporting HDLC/SDLC, UART, BISYNC, and transparent modes with autobaud. Unlike the MC68302, it omits SCC3, BRG3, FC2–0, IAC, FRZ, and AVEC pins - retaining only HALT-based external bus arbitration and slave-mode (DISCPU) operation with BR/BG/BGACK availability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Static 68000 architecture - enables zero-wait-state operation and full CMOS static power-down in standby modes. |
| Max Clock Frequency | 20 MHz - defines maximum instruction throughput and real-time response for time-critical peripheral control tasks. |
| Serial Interfaces | Two full-duplex SCCs - supports simultaneous HDLC/SDLC and UART protocols on separate channels for multi-protocol gateway applications. |
| Dual-Port RAM | 1152 bytes - provides shared memory between CPU and CP for efficient inter-processor messaging without external RAM access. |
| Timers | Three timers including watchdog and PIT - enables system supervision, periodic wake-up from low-power states, and precise timing intervals. |
| Package | 100-pin TQFP (Thin Quad Flat Pack) - reduces PCB footprint and height vs. 132-pin PGA; suitable for PCMCIA and slim industrial modules. |
| Power Modes | Low-power (standby) and freeze modes - allows selective clock gating and wake-up via two GPIO pins or PIT, cutting active current significantly. |
| PLL Input Options | 32 kHz or 4 MHz crystal - enables ultra-low-power real-time clocking or high-frequency system clock generation without external oscillator. |
Pinout & Package
MC68LC302PU20CT is housed in a 100-pin Thin Quad Flat Pack (TQFP) with 0.5 mm pitch, lead-free (RoHS-compliant), and thermally enhanced construction for convection-cooled embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Asynchronous reset input | Active-low signal that initializes CPU, CP, SIB, and all internal registers; required for deterministic boot sequence. |
| HALT | External bus halt request | Allows external master to pause CPU execution and gain bus control using simplified arbitration (no BG/BGACK in normal mode). |
| DISCPU | CPU disable (slave mode) | Places CPU in idle state while enabling CP and SIB peripherals to operate autonomously as intelligent DMA-driven peripheral. |
| WEH / WEL / OE | Memory write enable (high/low) and output enable | Replaces UDS/LDS/RW; enables glueless interface to 8-/16-bit EPROM, SRAM, Flash, and EEPROM without address latches or bus transceivers. |
| MODCLK | PLL reference clock select | Sampled at reset to configure PLL for 32 kHz or 4 MHz crystal input - determines clock synthesis strategy and power profile. |
| XFC | PLL feedback control | Connects to crystal load capacitor; critical for stable PLL lock and jitter performance in frequency-synthesized clock generation. |
| PA0–PA10, PB0–PB11 | Programmable I/O ports | Multi-function pins supporting serial data (RXD/TXD), clock (RCLK), control (RTS/CTS/CD), timer inputs/outputs, and general-purpose GPIO. |
| CS0–CS3 | Chip select outputs | Four independent, programmable memory/peripheral select signals with configurable address ranges and wait-state insertion. |
Key Features
| Feature | Design Value |
|---|---|
| Static 68000 Core | Enables true zero-power standby and eliminates need for external clock gating circuitry in battery-powered designs. |
| Dual SCCs with Autobaud | Supports mixed-protocol communication (e.g., SDLC over one channel, UART over another) with automatic baud rate detection for plug-and-play serial device integration. |
| On-Chip Dual-Port RAM | Eliminates contention and latency when CPU and CP exchange command/status data - improves deterministic response in real-time protocol stacks. |
| Periodic Interrupt Timer (PIT) | Provides precise, low-overhead wake-up scheduling during standby - avoids reliance on external RTC or polling loops. |
| Glueless Memory Interface | Reduces BOM count and layout complexity by integrating WEH/WEL/OE logic and wait-state generators for common memory types. |
| 32 kHz/4 MHz PLL Support | Allows single-crystal solution for both low-power timekeeping and high-speed system clock - simplifies clock tree and lowers EMI risk. |
Applications
| PCMCIA Card Controller | Intelligent Serial Peripheral |
|---|---|
Use Scenario: Embedded controller in Type II PCMCIA cards requiring compact form factor, low height, and autonomous serial protocol handling. IC Role / Device Role / Timing Role: Primary host controller managing card interface, memory mapping, and dual-protocol serial communications (e.g., SDLC for telemetry, UART for diagnostics). Use Value: 100-pin TQFP fits PCMCIA mechanical envelope; static core and PIT enable deep sleep between data bursts, extending battery life. | Use Scenario: Standalone fieldbus node or protocol converter interfacing legacy RS-232/RS-485 devices with modern networks. IC Role / Device Role / Timing Role: Intelligent peripheral executing protocol translation (e.g., Modbus RTU ↔ HDLC) while offloading host CPU via DISCPU-driven DMA transfers. Use Value: Dual SCCs handle concurrent protocols; on-chip dual-port RAM buffers messages without external memory; slave mode enables seamless integration into larger bus systems. |
| Portable Data Terminal | Low-Power Industrial Monitor |
Use Scenario: Handheld asset tracker or barcode scanner needing extended runtime, rugged operation, and multi-interface connectivity. IC Role / Device Role / Timing Role: Central processing unit running real-time OS, managing LCD, keypad, and dual serial interfaces for GPS and wireless modem links. Use Value: 20 MHz performance meets UI responsiveness needs; low-power modes extend battery life; 32 kHz PLL supports accurate timekeeping during sleep. | Use Scenario: DIN-rail mounted sensor aggregator collecting analog/digital inputs and transmitting via RS-485 or CAN (via external transceiver). IC Role / Device Role / Timing Role: Protocol-aware edge controller performing local alarm logic, timestamping, and buffered transmission using PIT-triggered wake-up cycles. Use Value: Three timers provide independent event scheduling; watchdog ensures recovery from firmware hangs; dual-port RAM isolates CP packet assembly from CPU data logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar integrated multiprotocol processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68302RC20 | 132-pin PGA package; includes third SCC (SCC3), full bus arbitration (BG/BGACK/BR), FC2–0, FRZ, AVEC pins. | Required where full bus-mastering capability, triple serial channels, or ICE debugging support is mandatory. | Select MC68302RC20 only if SCC3 or external bus arbitration is needed; otherwise MC68LC302PU20CT offers lower cost and smaller footprint. |
| MC68332ACPV16 | 32-bit CPU core (M68332), higher integration (QSM, TIM, MSCAN), no SCCs - uses queue serial module instead. | Targets CAN-based automotive/industrial control; lacks native HDLC/SDLC support but adds real-time interrupt handling and motor control peripherals. | Choose MC68332ACPV16 for CAN-centric designs requiring deterministic interrupt latency; MC68LC302PU20CT remains optimal for legacy SDLC/UART multi-protocol gateways. |
Compared with MC68302RC20 and MC68332ACPV16, the MC68LC302PU20CT delivers targeted protocol flexibility and low-power efficiency in a compact TQFP package - ideal for cost-sensitive, space-constrained applications where SCC3 and full bus arbitration are unnecessary.
Availability
MC68LC302PU20CT is available at Aetrix Electronics and suitable for PCMCIA controllers, intelligent serial peripherals, portable data terminals, and low-power industrial monitors requiring stable component supply across long-lifecycle embedded programs.
Supply support for MC68LC302PU20CT 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, microcontrollers, and analog chips for automotive, industrial, and networking markets.
The MC68LC302PU20CT belongs to Freescale's Integrated Multiprotocol Processor (IMP) family, engineered to consolidate protocol handling, real-time control, and system integration in cost-sensitive, low-power embedded systems.
FAQ
What is the primary function of the MC68LC302PU20CT in embedded systems?
The MC68LC302PU20CT serves as an integrated multiprotocol processor combining a static 68000 CPU core, two serial communication controllers (SCCs), timers, dual-port RAM, and system control logic. It functions as a self-contained controller for protocol-rich applications like PCMCIA cards and intelligent peripherals - eliminating the need for external protocol co-processors or glue logic in many designs.
Does the MC68LC302PU20CT support 32 kHz crystal operation?
Yes, the MC68LC302PU20CT supports 32 kHz crystal input via the MODCLK pin, which is sampled at reset to configure the on-chip PLL for low-power clock synthesis. This enables accurate real-time clocking and ultra-low-power standby operation - a key advantage for battery-powered applications where continuous timekeeping is required without waking the full CPU.
How does the MC68LC302PU20CT differ from the MC68302 in terms of serial interface capability?
The MC68LC302PU20CT retains two full-duplex SCCs identical to those in the MC68302 but omits SCC3 and its associated baud rate generator (BRG3). This reduction supports cost and pin-count optimization for applications not requiring three independent serial channels - making the MC68LC302PU20CT ideal for dual-protocol gateways where SCC3 is unused.
Can the MC68LC302PU20CT operate in slave mode, and what features remain active?
Yes, the MC68LC302PU20CT supports slave mode via the DISCPU pin, disabling the CPU while keeping the Communications Processor (CP), System Integration Block (SIB), timers, and dual-port RAM fully operational. In this mode, BR, BG, and BGACK pins become available, allowing the device to act as an intelligent, DMA-driven peripheral with full serial, timing, and memory-mapped I/O capabilities under host CPU control.
What package type and temperature range does the MC68LC302PU20CT use?
The MC68LC302PU20CT is supplied in a 100-pin Thin Quad Flat Pack (TQFP) package rated for commercial temperature range (0 °C to +70 °C). Its compact, low-profile construction makes it suitable for height-restricted applications such as PCMCIA cards and slim industrial modules - distinguishing it from the 132-pin PGA variant used for development and emulation.
MC68LC302PU20CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 100-LQFP
- Series:
- M683xx
- Packaging:
- Tray
- 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:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
- Additional Interfaces:
- GCI, IDL, ISDN, NMSI, PCM, SCPI
MC68LC302PU20CT FAQ
1.How can I place an order for MC68LC302PU20CT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68LC302PU20CT 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 MC68LC302PU20CT reliable?
The price and inventory of MC68LC302PU20CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68LC302PU20CT is usually 5 days.
3.What payment methods are accepted for MC68LC302PU20CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68LC302PU20CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68LC302PU20CT?
MC68LC302PU20CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68LC302PU20CT 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 MC68LC302PU20CT?
For technical support, including MC68LC302PU20CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68LC302PU20CT requirements.
6.How does Aetrix verify that MC68LC302PU20CT is sourced from the original manufacturer or authorized distributors?
All MC68LC302PU20CT 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 MC68LC302PU20CT meets industry standards.
7.What is the process for return or replacement of MC68LC302PU20CT?
All MC68LC302PU20CT units undergo pre-shipment inspection (PSI). If there is an issue with MC68LC302PU20CT, 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 MC68LC302PU20CT part is unused and in its original packaging.
Return procedure for MC68LC302PU20CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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