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NXP Semiconductors MC68HC908JK8CDW
- Part No.:
- MC68HC908JK8CDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908JK8CDW.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,807
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Product details
Overview
MC68HC908JK8CDW from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 8 KB on-chip Flash memory, 512 B RAM, and integrated peripherals including SCI, TIM, ADC (8-channel, 8-bit), and KBI. It operates at up to 8 MHz bus frequency, supports 5 V operation, and targets embedded control in industrial sensors and appliance motor interfaces.
For engineers reviewing the MC68HC908JK8CDW datasheet, MC68HC908JK8CDW pinout, MC68HC908JK8CDW application, or MC68HC908JK8CDW equivalent, key selection criteria include its 28-pin SOIC-W package, internal oscillator option, COP watchdog, and ROM-based monitor for in-system programming - all critical for cost-sensitive, low-power MCU deployments.
Technical Context
The MC68HC908JK8CDW implements the HCS08 CPU core with a 16-bit address bus, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) provides clock generation, reset control, interrupt management, and low-power modes (Wait/Stop) with wake-up via IRQ, KBI, or SCI.
Peripheral integration includes a 16-bit Timer Interface Module (TIM) with input capture, output compare, and PWM; an 8-channel 8-bit Analog-to-Digital Converter (ADC) with software-triggered conversion; and a full-duplex Serial Communications Interface (SCI) with programmable baud rate and framing error detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 32+ instructions - enables compact firmware and deterministic real-time response. |
| Flash Memory | 8 KB on-chip Flash with block protection - supports field firmware updates and secure code storage without external memory. |
| RAM Size | 512 bytes of on-chip RAM - sufficient for stack, variables, and small buffers in sensor or actuator control tasks. |
| Max Bus Frequency | 8 MHz - delivers 200 ns instruction cycle time for timing-critical I/O handling and PWM generation. |
| ADC Resolution | 8-bit, 8-channel SAR ADC - provides adequate dynamic range for temperature, voltage, and potentiometer sensing in appliances. |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic systems and industrial power rails. |
| Operating Temperature | –40 °C to +85 °C - qualified for industrial environments including HVAC controls and motor drives. |
Pinout & Package
MC68HC908JK8CDW is housed in a 28-pin SOIC-W (Wide) package (7.62 mm body width), RoHS-compliant, with 24 general-purpose I/O pins, 2 dedicated oscillator pins, 1 reset, and 1 IRQ input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power Supply / Ground | Primary 5 V supply and return - must be decoupled with 0.1 µF ceramic capacitor near pins for stable core and peripheral operation. |
| OSC1, OSC2 | Crystal Oscillator Input/Output | Supports external 32.768 kHz to 8 MHz crystal or ceramic resonator - determines system clock accuracy and startup time. |
| RESET | Active-Low Reset Input | Asynchronous reset pin with internal pull-up - initiates cold start or recovers from fault conditions including COP timeout. |
| IRQ | External Interrupt Request | Level-sensitive, edge-triggerable input - used for emergency stop signals or high-priority event capture in real-time systems. |
| PTA0–PTA7 | Port A I/O Pins | 8-bit bidirectional port with configurable pull-ups - commonly assigned to keypad scan lines or status LEDs in HMI designs. |
| PTD0–PTD7 | Port D I/O Pins | 8-bit port with alternate functions including T1CH0/T1CH1 (TIM channels) and ADC inputs - enables mixed-signal control loop implementation. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip Monitor ROM | Enables in-system programming via SCI without external programmer - reduces production test complexity and field upgrade cost. |
| Computer Operating Properly (COP) | Configurable watchdog timer with independent RC oscillator - prevents runaway code in unattended systems like vending machines or pumps. |
| Keyboard Interrupt Module (KBI) | 8-input debounced scan interface with wake-from-Stop capability - ideal for low-power remote controls and panel keypads. |
| Low-Voltage Inhibit (LVI) | Hardware brown-out detection at 4.0 V ±0.2 V - forces reset before Flash write corruption or register instability occurs. |
| Flash Block Protection | Programmable lock bits per 1-KB block - secures bootloader or calibration data against accidental overwrite during field updates. |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
|
Use Scenario: Standalone temperature/humidity sensor node with serial output and LED status indication. IC Role / Device Role / Timing Role: Central controller managing ADC sampling, SCI transmission, and low-power sleep cycles. Use Value: Integrated 8-bit ADC and SCI eliminate external signal conditioning and UART ICs, reducing BOM count and PCB area. |
Use Scenario: Washing machine main control board regulating motor speed, water level, and user interface. IC Role / Device Role / Timing Role: Real-time coordinator of TRIAC firing, solenoid sequencing, and front-panel button scanning. Use Value: KBI module handles 8-key matrix with hardware de-bounce and wake-from-Stop, extending battery life in standby mode. |
| Motor Drive Interface | Smart Power Outlet |
|
Use Scenario: Brushless DC fan controller with tachometer feedback and thermal shutdown. IC Role / Device Role / Timing Role: PWM generator and ADC supervisor for closed-loop speed regulation and overtemperature cut-off. Use Value: TIM's buffered PWM outputs drive gate drivers with precise duty-cycle control, while LVI prevents erratic behavior during line sags. |
Use Scenario: Energy-monitoring outlet with current sensing, relay control, and RS-232 communication. IC Role / Device Role / Timing Role: Isolated measurement processor interfacing shunt resistor, opto-isolated relay driver, and SCI-to-RS232 bridge. Use Value: 512 B RAM accommodates calibration coefficients and rolling energy counters; Flash endurance supports 10k+ program/erase cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908JL8CDW | Same 28-pin SOIC-W package and HCS08 core, but with 16 KB Flash and identical peripheral set - higher code capacity without layout change. | Preferred where firmware growth exceeds 8 KB or future feature expansion is anticipated. | Select when long-term code scalability is required and cost premium for extra Flash is acceptable. |
| MC9RS08KA8CDW | Renesas RS08 core, 8 KB Flash, 1 KB RAM, 20 MHz max bus speed - newer architecture with lower active current (180 µA/MHz) but no KBI module. | Better suited for ultra-low-power sensor nodes; lacks hardware keyboard scan support. | Choose for battery-powered designs needing longer runtime, but rework I/O mapping if replacing KBI functionality. |
Compared with MC68HC908JL8CDW, the MC68HC908JK8CDW trades Flash capacity for lower unit cost in fixed-function applications; versus MC9RS08KA8CDW, it retains legacy KBI compatibility at the expense of higher active power and older toolchain support.
Availability
MC68HC908JK8CDW is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, and motor interface modules requiring stable component supply across multi-year production cycles.
Supply support for MC68HC908JK8CDW 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) pioneered 8-bit MCU architectures for automotive and industrial markets, emphasizing robustness, toolchain maturity, and long-term product availability.
The MC68HC908JK8CDW belongs to the HCS08 family, designed specifically for cost-sensitive, low-pin-count embedded control applications where reliability, integrated peripherals, and in-system programmability are essential.
FAQ
What is the maximum operating frequency of the MC68HC908JK8CDW?
The MC68HC908JK8CDW supports a maximum bus frequency of 8 MHz, derived from its internal oscillator or external crystal source. This yields a 200 ns instruction cycle time, enabling responsive real-time control in applications such as motor commutation and sensor polling. The actual achievable frequency depends on supply voltage stability and ambient temperature within the –40 °C to +85 °C range.
Does the MC68HC908JK8CDW include a hardware watchdog timer?
Yes, the MC68HC908JK8CDW integrates a Computer Operating Properly (COP) watchdog timer with an independent RC oscillator. It can be enabled or disabled via CONFIG register settings and offers timeout periods from 1.8 ms to 2.3 s. This feature ensures system recovery from software hangs in unattended applications like industrial timers or pump controllers.
Can the MC68HC908JK8CDW perform in-system programming without external hardware?
Yes, the MC68HC908JK8CDW contains a 1 KB Monitor ROM that supports in-system programming via its SCI interface. Using the built-in command set (e.g., PRGRNGE, ERARNGE), firmware updates can be performed directly over UART without a dedicated programmer - a key advantage for field-deployed devices such as smart meters or HVAC controllers.
What analog input capabilities does the MC68HC908JK8CDW provide?
The MC68HC908JK8CDW features an 8-channel, 8-bit successive-approximation ADC with software or timer-triggered conversion. Input channels map to Port D pins (PTD0–PTD7), supporting single-ended measurements referenced to VDD and VSS. Conversion time is 25 µs per sample at 8 MHz bus speed, making it suitable for slow-varying signals like thermistor readings or power supply monitoring.
Is the MC68HC908JK8CDW pin-compatible with other members of the HC908 family?
The MC68HC908JK8CDW shares the same 28-pin SOIC-W footprint and core peripheral mapping with MC68HC908JL8CDW and MC68HC908KL8CDW. However, differences in Flash size, RAM allocation, and mask options mean firmware and configuration registers require validation before substitution - especially for COP setup, interrupt vectors, and memory layout.
MC68HC908JK8CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 15
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 12x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908JK8CDW FAQ
1.How can I place an order for MC68HC908JK8CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908JK8CDW 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 MC68HC908JK8CDW reliable?
The price and inventory of MC68HC908JK8CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908JK8CDW is usually 5 days.
3.What payment methods are accepted for MC68HC908JK8CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908JK8CDW transactions.
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4.How is shipping managed for MC68HC908JK8CDW?
MC68HC908JK8CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908JK8CDW 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 MC68HC908JK8CDW?
For technical support, including MC68HC908JK8CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908JK8CDW requirements.
6.How does Aetrix verify that MC68HC908JK8CDW is sourced from the original manufacturer or authorized distributors?
All MC68HC908JK8CDW 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 MC68HC908JK8CDW meets industry standards.
7.What is the process for return or replacement of MC68HC908JK8CDW?
All MC68HC908JK8CDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908JK8CDW, 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 MC68HC908JK8CDW part is unused and in its original packaging.
Return procedure for MC68HC908JK8CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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