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NXP Semiconductors MC68HC908JL3ECFA
- Part No.:
- MC68HC908JL3ECFA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
MC68HC908JL3ECFA.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,388
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Product details
Overview
MC68HC908JL3ECFA from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It features a 20-pin SOIC package, internal clock oscillator, COP watchdog, LVI reset, and KBI for keypad scanning - deployed in cost-sensitive industrial control panels and appliance user interfaces.
For engineers reviewing the MC68HC908JL3ECFA datasheet, MC68HC908JL3ECFA pinout, MC68HC908JL3ECFA application, or MC68HC908JL3ECFA equivalent, this page delivers verified electrical specs, validated I/O mapping, real-world use cases, and two confirmed alternative parts for design continuity and sourcing flexibility.
Technical Context
The MC68HC908JL3ECFA implements the HCS08 CPU core with 8-bit ALU, 16-bit address bus, and Harvard architecture memory organization. It integrates a System Integration Module (SIM) for clock generation, reset management, and interrupt control - supporting both crystal (XTALCLK) and RC-based oscillator modes with configurable startup timing.
Its peripheral set includes a Timer Interface Module (TIM) with input capture, output compare, and PWM generation; a Keyboard Interrupt Module (KBI) with edge-triggered scan capability; and a Monitor ROM enabling in-system programming via UART without external debugger hardware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit addressing and 59-instruction set - enables deterministic real-time control in resource-constrained systems. |
| Memory (FLASH / RAM) | 4 KB on-chip FLASH (erase/program via MON ROM), 192 B RAM - sufficient for firmware with sensor polling, UI logic, and basic communication stacks. |
| ADC | 8-channel 8-bit successive-approximation ADC with 10 µs conversion time - supports analog front-end sampling for temperature, voltage, or potentiometer inputs. |
| Timers | 16-bit TIM with 2-channel output compare, input capture, and buffered/unbuffered PWM - suitable for motor speed control or LED dimming at up to 1 MHz base frequency. |
| Oscillator | Internal RC oscillator (±2% accuracy) or external crystal (1–8 MHz) - eliminates need for external clock source in low-cost applications. |
| Supply Voltage | 2.7–5.5 V operation - compatible with single-cell Li-ion, 3.3 V logic rails, and legacy 5 V industrial buses. |
| Package | 20-pin SOIC (300 mil) - surface-mount compatible with standard reflow profiles and automated assembly lines. |
Pinout & Package
MC68HC908JL3ECFA is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width, JEDEC MS-013AC compliant footprint, and lead-free RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main 2.7–5.5 V supply rail; decoupling capacitor required at pin for stable core and peripheral operation. |
| VSS | Ground Reference | Digital ground return path; must be connected to system GND plane with low-impedance trace. |
| OSC1 / XTALIN | Clock Input | Crystal amplifier input for external 1–8 MHz quartz resonator; high-impedance CMOS input requiring proper load capacitance. |
| OSC2 / PTA6 / RCCLK | Clock Output / GPIO / RC Clock | Crystal amplifier output or general-purpose I/O; also carries internal RC oscillator signal when enabled. |
| PTA0–PTA7 | Port A I/O | 8-bit bidirectional port with individual pull-up enable (PTAPUE); PTA0–PTA3 support KBI interrupt triggering. |
| PTB0–PTB3 | Port B I/O | 4-bit bidirectional port; PTB0 serves as IRQ1 external interrupt input with configurable edge sensitivity. |
| PTD0–PTD3 | Port D I/O | 4-bit bidirectional port with alternate functions including TIM channel outputs and ADC inputs (PTD0–PTD3 = ADC0–ADC3). |
| RESET | Active-Low Reset | Asynchronous reset input; internal POR and LVI generate reset pulses; external pull-up required. |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Enables in-system programming and debugging over UART without external programmer - reduces production test complexity and field firmware updates. |
| Computer Operating Properly (COP) | Configurable watchdog timer with 16 selectable timeout intervals (0.5 ms to 1.0 s) - prevents runaway code in safety-critical embedded functions. |
| Low-Voltage Inhibit (LVI) | Hardware reset generator triggered at 2.5 V ±0.1 V - ensures reliable operation during brown-out conditions without software intervention. |
| Keyboard Interrupt Module (KBI) | Edge-sensitive interrupt on PTA0–PTA3 with automatic wake-from-wait mode - ideal for low-power keypad scanning in battery-operated devices. |
| Flexible Oscillator Options | Supports both external crystal and internal RC oscillator - allows design reuse across cost-optimized (RC) and precision-timing (XTAL) variants. |
Applications
| Industrial Control Panel | Home Appliance UI |
|---|---|
|
Use Scenario: Front-panel interface for HVAC controllers with rotary encoder, LED indicators, and temperature sensor feedback. IC Role / Device Role / Timing Role: Central MCU executing UI state machine, reading analog thermistor, driving 7-segment displays via multiplexing, and managing serial communication to main controller. Use Value: Integrated KBI reduces external debounce circuitry; 8-bit ADC eliminates need for external converter; MON ROM simplifies factory calibration. |
Use Scenario: Keypad and display subsystem in microwave ovens, handling button press detection, timer countdown, and buzzer control. IC Role / Device Role / Timing Role: Dedicated UI processor responding to keypress interrupts, updating LCD segments, generating audible tones via PWM, and monitoring door switch status. Use Value: Low-power wait mode extends standby battery life; COP watchdog ensures safe shutdown on fault; 20-pin SOIC fits compact PCB layouts. |
| Smart Power Outlet | LED Lighting Controller |
|
Use Scenario: Energy-monitoring outlet with current sensing, relay control, and Bluetooth LE interface to smartphone app. IC Role / Device Role / Timing Role: Sensor acquisition MCU digitizing shunt voltage, calculating RMS current, controlling triac/relay, and buffering data for wireless transmission. Use Value: 4 KB FLASH accommodates energy algorithm + BLE stack; ADC supports 12-bit effective resolution via oversampling; LVI prevents erratic behavior during line dips. |
Use Scenario: Dimmable LED driver module for commercial lighting, accepting 0–10 V analog dimming input and generating PWM to MOSFET gate. IC Role / Device Role / Timing Role: Analog-input responsive controller converting 0–10 V signal to precise 1–100% PWM duty cycle with thermal foldback protection. Use Value: TIM's buffered PWM ensures glitch-free output during firmware updates; internal RC oscillator meets ±5% dimming linearity requirement; 192 B RAM holds calibration coefficients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CSC | RS08 core, 2 KB FLASH, 128 B RAM, no KBI, 6-channel ADC - smaller memory and fewer peripherals. | Limited to simpler UIs without keypad matrix; lacks dedicated keyboard scan hardware. | Select when cost and footprint are primary constraints and KBI functionality is unnecessary. |
| MC9S08QG4CDTE | S08 core, 4 KB FLASH, 256 B RAM, 10-channel 10-bit ADC, SPI/I²C - enhanced analog and communication capability. | Supports richer sensor fusion and multi-protocol connectivity but requires larger PCB area (32-pin TSSOP). | Choose when higher-resolution ADC or serial interfaces are required and board space permits. |
Compared with MC68HC908JL3ECFA, MC9RS08KA2CSC offers lower BOM cost but reduced feature depth, while MC9S08QG4CDTE provides expanded peripheral integration at the expense of package size and power consumption - making MC68HC908JL3ECFA optimal for balanced cost-performance in compact 20-pin designs.
Availability
MC68HC908JL3ECFA is available at Aetrix Electronics and suitable for industrial control panels, home appliance user interfaces, and smart power outlets requiring stable component supply and long-term manufacturing continuity.
Supply support for MC68HC908JL3ECFA 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
NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MC68HC908JL3ECFA belongs to the legacy HCS08 microcontroller family, designed for cost-effective, low-power embedded control in appliances, industrial HMIs, and consumer electronics with minimal external components.
FAQ
What is the maximum operating frequency of the MC68HC908JL3ECFA?
The MC68HC908JL3ECFA supports a maximum bus frequency of 8 MHz when using an external crystal oscillator. With the internal RC oscillator, typical operation is at 4 MHz (±2% accuracy). The CPU executes instructions at bus frequency, enabling sub-microsecond interrupt response and consistent real-time performance in control loops. This frequency range balances speed, power efficiency, and EMI compliance for Class B industrial environments.
Does the MC68HC908JL3ECFA support in-system programming?
Yes, the MC68HC908JL3ECFA includes a built-in Monitor ROM (MON) that enables in-system programming via UART using standard ASCII commands. This feature allows firmware updates and calibration data loading without removing the device from the PCB or using external debug hardware. The MON ROM occupies fixed memory space and is accessible after reset when the appropriate entry sequence is applied on the serial interface.
What are the power supply requirements for the MC68HC908JL3ECFA?
The MC68HC908JL3ECFA operates from a single supply rail of 2.7 V to 5.5 V DC, making it compatible with both 3.3 V and 5 V system designs. It includes an internal Low-Voltage Inhibit (LVI) circuit that asserts reset below 2.5 V ±0.1 V, ensuring predictable behavior during brown-out events. Decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) are recommended at VDD/VSS pins per Freescale's layout guidelines.
How many I/O pins does the MC68HC908JL3ECFA provide?
The MC68HC908JL3ECFA provides 16 programmable I/O pins across three ports: Port A (8 pins), Port B (4 pins), and Port D (4 pins). All pins are individually configurable as input or output with optional internal pull-ups (Port A only). Several pins support secondary functions including ADC inputs (PTD0–PTD3), TIM outputs (PTA4–PTA5), and KBI interrupts (PTA0–PTA3), enabling flexible peripheral mapping without external logic.
Is there a drop-in replacement for the MC68HC908JL3ECFA?
No pin-compatible or drop-in replacement exists for the MC68HC908JL3ECFA within the NXP portfolio. While MC9S08QG4CDTE shares functional overlap (same FLASH size, S08 core), it uses a 32-pin TSSOP package and different pinout. Migration requires PCB redesign and firmware adaptation. For continuity, Aetrix recommends securing long-term inventory of MC68HC908JL3ECFA and evaluating MC9S08QG4CDTE only for new designs where enhanced peripherals justify layout changes.
MC68HC908JL3ECFA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 23
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 3.3V
- Data Converters:
- A/D 12x8b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908JL3ECFA FAQ
1.How can I place an order for MC68HC908JL3ECFA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908JL3ECFA 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 MC68HC908JL3ECFA reliable?
The price and inventory of MC68HC908JL3ECFA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908JL3ECFA is usually 5 days.
3.What payment methods are accepted for MC68HC908JL3ECFA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908JL3ECFA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908JL3ECFA?
MC68HC908JL3ECFA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908JL3ECFA 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 MC68HC908JL3ECFA?
For technical support, including MC68HC908JL3ECFA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908JL3ECFA requirements.
6.How does Aetrix verify that MC68HC908JL3ECFA is sourced from the original manufacturer or authorized distributors?
All MC68HC908JL3ECFA 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 MC68HC908JL3ECFA meets industry standards.
7.What is the process for return or replacement of MC68HC908JL3ECFA?
All MC68HC908JL3ECFA units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908JL3ECFA, 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 MC68HC908JL3ECFA part is unused and in its original packaging.
Return procedure for MC68HC908JL3ECFA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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