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NXP Semiconductors MC68LC302CAF16CT
- Part No.:
- MC68LC302CAF16CT
- Manufacturer:
- NXP Semiconductors
- Category:
- Microprocessors
- Package:
- 100-LQFP
- Datasheet:
-
MC68LC302CAF16CT.pdf
- Description:
- IC MPU M683XX 16MHZ 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,146
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Product details
Overview
MC68LC302CAF16CT from Freescale is a low-cost integrated multiprotocol processor based on a static 68000 core, operating at 16.67 MHz with 5 V supply, housed in a 100-pin TQFP package. It integrates dual SCCs, three timers (including watchdog and PIT), 1152-byte dual-port RAM, four chip-select lines, and PLL support for 32 kHz or 4 MHz crystals-designed for embedded communications and portable control systems.
For engineers reviewing the MC68LC302CAF16CT datasheet, MC68LC302CAF16CT pinout, MC68LC302CAF16CT application, or MC68LC302CAF16CT equivalent, key selection criteria include dual-SCC protocol support (HDLC/UART/BISYNC), static-core low-power operation, glueless memory interface via WEH/WEL/OE, and absence of SCC3 and external bus arbitration pins compared to MC68302.
Technical Context
The MC68LC302CAF16CT implements a static M68000 CPU core enabling full 16-bit operation with optional 8-bit boot mode, paired with an on-chip SIB (System Integration Block) containing interrupt controller, PIO ports, and dual-port RAM. Its CP (Communication Processor) block delivers two independent full-duplex SCCs supporting HDLC, UART, BISYNC, and autobaud.
It features a programmable PLL accepting 32 kHz or 4 MHz crystal inputs, generating system clock; new low-power standby modes wakeable via PIT or two dedicated pins; and glueless interfacing using WEH/WEL/OE instead of UDS/LDS/RW-except in slave mode where IPL pins remap to bus control signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Static 68000 CPU core supporting 8-/16-bit data bus operation and 20-bit address bus (1 MB address space) |
| Operating Frequency | 16.67 MHz - fixed timing for deterministic real-time response in protocol processing and timer-driven I/O |
| Supply Voltage | 5 V ±5% - compatible with legacy TTL-level logic and standard 5 V power rails in industrial and telecom designs |
| On-Chip Memory | 1152-byte dual-port RAM - enables concurrent CPU and CP access for efficient buffer management in serial protocols |
| Serial Controllers | Two independent full-duplex SCCs - supports simultaneous HDLC framing, UART async comms, and BISYNC sync links |
| Timers | Three timers: watchdog, periodic interrupt timer (PIT), and general-purpose - enables system supervision, scheduled wake-up, and event timing |
| PLL Input Options | 32 kHz or 4 MHz crystal - reduces board-level oscillator count and total system power in battery-operated applications |
| Package | 100-pin TQFP (14 × 14 mm, 0.5 mm pitch) - enables compact PCB layout suitable for PCMCIA and height-constrained modules |
Pinout & Package
MC68LC302CAF16CT is supplied in a 100-pin Thin Quad Flat Pack (TQFP) with exposed thermal pad, lead-free and RoHS-compliant. Pin functions are validated per Freescale's MC68LC302 documentation and confirmed for this specific orderable variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET | Asynchronous reset input | Active-low signal initializing CPU, CP, timers, and SIB registers; required for reliable cold start and recovery |
| HALT | CPU halt control | Stops CPU execution while allowing CP and timers to remain active - enables low-overhead peripheral co-processing |
| DISCPU | CPU disable (slave mode) | Places CPU in high-impedance state, freeing bus for external master - retains SCC, timers, and chip selects as intelligent peripheral |
| WEH / WEL / OE | Memory write enable (high/low) and output enable | Replaces legacy UDS/LDS/RW; enables glueless interface to 8-/16-bit EPROM/SRAM/Flash without external logic |
| RXD1 / TXD1 / RCLK1 | SCC1 serial I/O and clock | Full-duplex HDLC/UART/BISYNC channel with programmable baud rate generation - primary protocol interface |
| RXD2 / TXD2 / RCLK2 | SCC2 serial I/O and clock | Independent second protocol channel - supports concurrent modem control, telemetry, or diagnostics link |
| PIT / WDOG / TIN1 / TOUT2 | Timer inputs/outputs | Supports periodic wake-up, system watchdog timeout, input capture, and pulse-width output for motor/sensor control |
| XFC / XTAL / EXTAL | PLL clock interface | Accepts 32 kHz or 4 MHz crystal; XFC configures PLL mode post-reset - eliminates need for external clock generator |
Key Features
| Feature | Design Value |
|---|---|
| Static 68000 Core | Enables zero-power retention in standby mode and deterministic instruction timing critical for real-time protocol stacks |
| Dual Full-Duplex SCCs | Allows concurrent implementation of two distinct serial protocols (e.g., HDLC for WAN + UART for local console) without software arbitration |
| On-Chip 1152-Byte Dual-Port RAM | Eliminates external SRAM for CP buffers, reducing BOM cost and PCB area while enabling lock-free CPU–CP data exchange |
| Programmable PLL with 32 kHz/4 MHz Input | Lowers system power by up to 40% versus higher-frequency crystals and removes need for external clock synthesizer IC |
| Low-Power Standby Modes | Reduces active current to microamp range; wake-up via PIT interval or two GPIO pins - ideal for battery-backed telemetry nodes |
| Glueless Memory Interface (WEH/WEL/OE) | Direct connection to common memory types without address latches or bus transceivers - simplifies design and improves signal integrity |
Applications
| Industrial Telemetry Node | PCMCIA Modem Card |
|---|---|
Use Scenario: Remote sensor aggregation unit transmitting data over leased line using HDLC framing and receiving configuration commands via UART. IC Role / Device Role / Timing Role: Primary protocol processor handling link-layer framing, CRC generation, and timer-synchronized polling. Use Value: Dual SCCs process both WAN and local comms simultaneously; static core ensures stable operation during brownouts common in field deployments. | Use Scenario: Credit card-sized modem implementing V.34 analog line interface and AT command interpreter in laptop expansion slot. IC Role / Device Role / Timing Role: Host-facing intelligent peripheral managing line signaling, data buffering, and flow control independent of host CPU. Use Value: 100-pin TQFP fits PCMCIA Type II height limit (5.0 mm); DISCPU mode allows host to directly control SCCs and timers as coprocessor. |
| Portable Diagnostic Tool | Legacy Protocol Gateway |
Use Scenario: Handheld device communicating with automotive ECUs via ISO 9141 (K-line) and reading CAN logs via UART-to-CAN bridge firmware. IC Role / Device Role / Timing Role: Real-time protocol translator with precise bit-timing control and low-latency interrupt response. Use Value: PIT enables 10 ms wakeup for periodic bus polling; 32 kHz PLL minimizes battery drain during idle intervals. | Use Scenario: Retrofit gateway converting RS-232 BISYNC mainframe traffic to TCP/IP Ethernet using external PHY and TCP stack offload. IC Role / Device Role / Timing Role: Deterministic serial protocol engine with hardware CRC and synchronous framing, decoupled from network stack timing. Use Value: On-chip dual-port RAM stores inbound/outbound frames; SCC2 handles BISYNC while SCC1 manages Ethernet MAC interface handshake. |
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, 20 MHz, includes SCC3 and full bus arbitration (BR/BG/BGACK), no PLL for 32 kHz | Required where third serial channel or external bus master control is mandatory; unsuitable for TQFP-limited layouts | Select when legacy MC68302 compatibility, full bus sharing, or triple-SCC concurrency is essential |
| MC68360VR33B | 33 MHz PowerQUICC, integrated QUICC engine, 32-bit MPC8xx core, no 68k ISA, different memory map and interrupt model | Targets higher-throughput packet processing (e.g., PPP, Frame Relay); requires complete firmware rewrite and PCB redesign | Choose only for new designs needing >20 MIPS throughput and integrated Ethernet/MII support |
Compared with MC68302RC20 and MC68360VR33B, the MC68LC302CAF16CT offers optimal balance of 68k software compatibility, dual-SCC protocol flexibility, and TQFP footprint - making it the preferred choice for cost-sensitive, space-constrained, or battery-powered upgrades from MC68302 where SCC3 is unused.
Availability
MC68LC302CAF16CT is available at Aetrix Electronics and suitable for industrial telemetry nodes, PCMCIA modem cards, portable diagnostic tools, and legacy protocol gateways requiring stable component supply and long-term obsolescence management.
Supply support for MC68LC302CAF16CT 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 MC68LC302CAF16CT belongs to Freescale's Integrated Multiprotocol Processor (IMP) family, engineered to reduce system cost and board area in communications equipment by integrating CPU, dual serial controllers, timers, and memory on a single chip.
FAQ
What is the maximum operating frequency of the MC68LC302CAF16CT?
The MC68LC302CAF16CT is rated for 16.67 MHz operation at 5 V and 0 °C to +70 °C ambient. This frequency is fixed for this orderable variant and corresponds to a 60 ns cycle time, ensuring deterministic timing for HDLC frame assembly, UART sampling, and timer interrupts. The MC68LC302CAF16CT does not support overclocking beyond its specified rating.
Does the MC68LC302CAF16CT support 3.3 V operation?
No, the MC68LC302CAF16CT is a 5 V-only device. It is part of the 5 V ordering group (PU16 suffix) and requires 5 V ±5% supply. Freescale offered separate 3.3 V variants (e.g., MC68LC302PU16V), but the MC68LC302CAF16CT specifically uses 5 V logic levels and is incompatible with 3.3 V I/O interfaces without level translation.
How many serial communication controllers does the MC68LC302CAF16CT include?
The MC68LC302CAF16CT includes two independent full-duplex Serial Communication Controllers (SCCs). Unlike the original MC68302, it omits SCC3 to reduce pin count and cost. Each SCC supports HDLC, UART, BISYNC, and transparent modes with autobaud detection - sufficient for most dual-link embedded communications applications.
Can the MC68LC302CAF16CT operate in low-power standby mode?
Yes, the MC68LC302CAF16CT supports dedicated low-power standby modes that disable the CPU core while keeping the CP, timers, and PIO active. Wake-up is possible via the Periodic Interrupt Timer (PIT) or two configurable pins (PB8 and PB9). This capability makes the MC68LC302CAF16CT well-suited for battery-powered telemetry and portable diagnostic devices.
What package type and pin count does the MC68LC302CAF16CT use?
The MC68LC302CAF16CT uses a 100-pin Thin Quad Flat Pack (TQFP) package with 0.5 mm lead pitch and 14 mm × 14 mm body size. This package replaces the 132-pin PGA used in earlier MC68302 versions, reducing board area and height - critical for PCMCIA, handheld, and space-constrained industrial modules.
MC68LC302CAF16CT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 100-LQFP
- Series:
- M683xx
- Packaging:
- Bulk
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-LQFP (14x14)
- Additional Interfaces:
- GCI, IDL, ISDN, NMSI, PCM, SCPI
MC68LC302CAF16CT FAQ
1.How can I place an order for MC68LC302CAF16CT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68LC302CAF16CT 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 MC68LC302CAF16CT reliable?
The price and inventory of MC68LC302CAF16CT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68LC302CAF16CT is usually 5 days.
3.What payment methods are accepted for MC68LC302CAF16CT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68LC302CAF16CT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68LC302CAF16CT?
MC68LC302CAF16CT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68LC302CAF16CT 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 MC68LC302CAF16CT?
For technical support, including MC68LC302CAF16CT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68LC302CAF16CT requirements.
6.How does Aetrix verify that MC68LC302CAF16CT is sourced from the original manufacturer or authorized distributors?
All MC68LC302CAF16CT 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 MC68LC302CAF16CT meets industry standards.
7.What is the process for return or replacement of MC68LC302CAF16CT?
All MC68LC302CAF16CT units undergo pre-shipment inspection (PSI). If there is an issue with MC68LC302CAF16CT, 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 MC68LC302CAF16CT part is unused and in its original packaging.
Return procedure for MC68LC302CAF16CT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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