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NXP Semiconductors MC68HC908JL3ECDW
- Part No.:
- MC68HC908JL3ECDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908JL3ECDW.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,514
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Product details
Overview
MC68HC908JL3ECDW 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 oscillator option, and supports low-power Wait/Stop modes for battery-operated sensor interfaces and industrial control panels.
For engineers reviewing the MC68HC908JL3ECDW datasheet, MC68HC908JL3ECDW pinout, MC68HC908JL3ECDW application, or MC68HC908JL3ECDW equivalent, key selection criteria include its 5 V operation, 8 MHz bus speed, KBI keyboard interrupt support, TIM module with PWM and input capture, and MON ROM-based in-circuit programming capability.
Technical Context
The MC68HC908JL3ECDW implements the HCS08 CPU core with 16-bit address space, 8-bit data path, and Harvard architecture memory organization. Its System Integration Module (SIM) provides clock generation, reset control, and interrupt management with three priority levels and vectorized IRQ/KBI/BREAK handling.
It integrates a 2-channel Timer Interface Module (TIM) supporting unbuffered/buffered output compare, input capture, and PWM generation with programmable prescaler and modulo counting. The ADC subsystem uses successive approximation with software-triggered conversion and configurable sample time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit CISC core with 16-bit addressing and 20 ns minimum instruction cycle at 8 MHz bus clock |
| FLASH Memory | 4 KB on-chip FLASH with block erase, mass erase, and in-system programmability via MON ROM |
| RAM | 192 bytes of on-chip RAM with no wait states across full operating voltage range |
| ADC | 8-channel 8-bit successive-approximation ADC with 12 µs typical conversion time and software trigger only |
| Timers | 2-channel TIM with 16-bit counter, input capture, output compare, and PWM generation with double-buffered registers |
| Oscillator | Supports external crystal (1–8 MHz) or internal RC oscillator (1–4 MHz); SIMOSCEN enables/disables oscillator dynamically |
| Supply Voltage | Operates from 2.7 V to 5.5 V; LVI circuit monitors VDD and asserts reset below 2.5 V (typical) |
Pinout & Package
MC68HC908JL3ECDW is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package with 0.300-inch body width and standard 0.050-inch lead pitch. Pin assignments conform to JEDEC MS-013AC, with thermal pad omitted and moisture sensitivity level (MSL) rated at Level 3 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply rail; decoupling capacitor required within 10 mm of pin |
| VSS | Ground | Digital ground reference; must be connected to system ground plane with low-inductance path |
| OSC1 | Clock input | Crystal amplifier input; accepts external crystal or ceramic resonator (1–8 MHz) or CMOS clock source |
| OSC2/PTA6/RCCLK | Clock output / I/O / RC clock | Crystal amplifier output; also functions as Port A bit 6 or internal RC oscillator clock output |
| IRQ1 | External interrupt | Edge-sensitive active-low interrupt input with internal pull-up; triggers highest-priority hardware interrupt |
| KBI0–KBI3 | Keyboard interrupt inputs | Four dedicated pins supporting matrix keypad scanning with automatic wake-from-Stop on transition |
| PTA0–PTA5 | Port A general-purpose I/O | 6-bit bidirectional port with individually configurable direction and internal pull-up enable |
| PTB0–PTB7 | Port B general-purpose I/O | 8-bit bidirectional port with latchable outputs and Schmitt-trigger inputs for noise immunity |
| PTD0–PTD5 | Port D analog/digital I/O | 6-bit port with ADC channel mapping (AD0–AD5); supports analog input or digital I/O mode |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Enables in-system programming and debugging via UART without external programmer; supports baud rates up to 19.2 kbps |
| Computer Operating Properly (COP) | Watchdog timer with selectable timeout (0.5 ms to 1.6 s) and disable-on-break functionality for safe debug sessions |
| Low-Voltage Inhibit (LVI) | Hardware reset generator that holds MCU in reset when VDD drops below 2.5 V (±0.1 V), preventing erratic code execution |
| Keyboard Interrupt Module (KBI) | Four dedicated inputs with edge detection and wake-from-Stop capability; eliminates need for external interrupt logic in keypad systems |
| Timer Interface Module (TIM) | Two independent 16-bit channels supporting input capture with timestamping, output compare with toggle/force modes, and center-aligned PWM |
Applications
| Industrial Sensor Node | Appliance Control Panel |
|---|---|
Use Scenario: Standalone temperature/humidity sensor node with local LED indicators and UART telemetry output. IC Role / Device Role / Timing Role: Primary controller executing sensor polling, ADC sampling, and serial protocol framing. Use Value: On-chip 8-bit ADC eliminates external converter; MON ROM enables field firmware updates over UART; KBI simplifies button interface. |
Use Scenario: Front-panel controller for microwave oven with membrane keypad, display driver, and safety interlock monitoring. IC Role / Device Role / Timing Role: Real-time state machine managing user input, display refresh, and relay timing sequences. Use Value: IRQ1 handles door switch interrupts with sub-10 µs latency; COP ensures fail-safe shutdown on software hang; 4 KB FLASH accommodates multi-language UI. |
| Smart Meter Interface | Legacy Equipment Retrofit |
Use Scenario: Pulse-counting interface between electromechanical utility meter and RS-485 communication module. IC Role / Device Role / Timing Role: Edge-triggered pulse accumulator using TIM input capture with timestamped event logging. Use Value: Input capture channel records exact time of each kWh pulse; Stop mode reduces quiescent current to 1 µA for battery backup operation. |
Use Scenario: Drop-in replacement for obsolete 68HC11-based controllers in HVAC control boards with minimal PCB changes. IC Role / Device Role / Timing Role: Pin-compatible upgrade providing enhanced FLASH endurance (>10k cycles) and improved ADC linearity (±1 LSB). Use Value: Same 20-pin SOIC footprint and identical VDD/VSS/OSC/IRQ pin locations; MON ROM replaces EPROM burner dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908JK3ECDW | 2 KB FLASH, 128 B RAM, no ADC, same 20-pin SOIC package and HCS08 core | Suitable for simpler I/O-only control tasks without analog sensing | Select when cost-sensitive designs omit ADC requirements and require identical footprint |
| MC9RS08KA2CSC | RSA08 core, 2 KB FLASH, 128 B RAM, 10-bit ADC, 16-pin SOIC package | Higher-resolution ADC and smaller footprint but incompatible pinout and register map | Choose for new designs prioritizing ADC precision and board space; not drop-in compatible |
Compared with MC68HC908JL3ECDW, the JK3 variant reduces memory and removes ADC for lower-cost discrete control, while the RS08KA2 offers higher ADC resolution in a smaller package but requires PCB redesign and firmware porting.
Availability
MC68HC908JL3ECDW is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance control panels, and smart meter interfaces requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC908JL3ECDW 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Freescale's microcontroller heritage.
The MC68HC908JL3ECDW belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control in industrial and consumer equipment where reliability and toolchain maturity are critical.
FAQ
What is the maximum bus frequency supported by the MC68HC908JL3ECDW?
The MC68HC908JL3ECDW supports a maximum bus frequency of 8 MHz, achieved using an external crystal up to 8 MHz or internal RC oscillator calibrated to 4 MHz with optional doubling. This frequency determines instruction execution speed, peripheral timing, and ADC sampling rate limits.
Does the MC68HC908JL3ECDW include a hardware watchdog timer?
Yes, the MC68HC908JL3ECDW includes a Computer Operating Properly (COP) module functioning as a programmable watchdog timer with timeout intervals ranging from 0.5 ms to 1.6 s. It resets the MCU if not serviced within the selected window, ensuring recovery from software lockups.
Can the MC68HC908JL3ECDW operate from a 3.3 V supply?
Yes, the MC68HC908JL3ECDW operates across a 2.7 V to 5.5 V supply range, making it compatible with both 5 V and 3.3 V systems. At 3.3 V, it delivers full functionality including ADC, TIM, and MON ROM, with reduced current consumption versus 5 V operation.
How is in-system programming performed on the MC68HC908JL3ECDW?
In-system programming on the MC68HC908JL3ECDW is performed via its built-in Monitor ROM (MON), accessed through the UART interface using a standard terminal program. No external programmer is needed - users send ASCII commands to erase, program, and verify FLASH memory directly in the target system.
What packaging options are available for the MC68HC908JL3ECDW?
The MC68HC908JL3ECDW is offered exclusively in a 20-pin Small Outline Integrated Circuit (SOIC) package (suffix "DW"), measuring 7.5 mm × 12.8 mm with 0.300-inch body width and 0.050-inch lead pitch. No PDIP or QFP variants exist for this specific part number.
MC68HC908JL3ECDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 28-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:
- -
- 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:
MC68HC908JL3ECDW FAQ
1.How can I place an order for MC68HC908JL3ECDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908JL3ECDW 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 MC68HC908JL3ECDW reliable?
The price and inventory of MC68HC908JL3ECDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908JL3ECDW is usually 5 days.
3.What payment methods are accepted for MC68HC908JL3ECDW?
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4.How is shipping managed for MC68HC908JL3ECDW?
MC68HC908JL3ECDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908JL3ECDW 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 MC68HC908JL3ECDW?
For technical support, including MC68HC908JL3ECDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908JL3ECDW requirements.
6.How does Aetrix verify that MC68HC908JL3ECDW is sourced from the original manufacturer or authorized distributors?
All MC68HC908JL3ECDW 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 MC68HC908JL3ECDW meets industry standards.
7.What is the process for return or replacement of MC68HC908JL3ECDW?
All MC68HC908JL3ECDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908JL3ECDW, 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 MC68HC908JL3ECDW part is unused and in its original packaging.
Return procedure for MC68HC908JL3ECDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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