My Inquiry
My Account
NXP Semiconductors MC68HC908JL8CDW
- Part No.:
- MC68HC908JL8CDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908JL8CDW.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,980
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MC68HC908JL8CDW from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 8 KB on-chip Flash, 512 B RAM, and integrated peripherals including SCI, TIM, ADC, KBI, and COP watchdog. It operates at up to 8 MHz bus frequency, supports 3.3 V or 5 V supply, and targets low-cost embedded control in industrial sensors and appliance subsystems.
For engineers reviewing the MC68HC908JL8CDW datasheet, MC68HC908JL8CDW pinout, MC68HC908JL8CDW application, or MC68HC908JL8CDW equivalent, key selection criteria include its 20-pin SOIC-W package, 8-channel 8-bit ADC with 12 µs conversion time, SCI serial interface with programmable baud rate, and hardware keyboard interrupt module for matrix keypad scanning.
Technical Context
The MC68HC908JL8CDW implements the HCS08 CPU core with 16-bit address space, indexed addressing mode, and 42-instruction set optimized for compact code. Its System Integration Module (SIM) provides clock generation via internal RC oscillator or external crystal, configurable wait/stop low-power modes, and reset supervision including COP timeout and LVI brownout detection.
Peripheral integration includes a 16-bit TIM module with input capture, output compare, and PWM generation; an 8-channel single-ended ADC with software-triggered conversions; and a Keyboard Interrupt Module (KBI) supporting up to 8-key matrix scan with debouncing and wake-on-key functionality - all mapped to dedicated I/O pins in the 20-pin SOIC-W footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 42-instruction set for deterministic real-time control |
| Flash Memory | 8 KB on-chip Flash with block protection, enabling field firmware updates without external programmer |
| RAM Size | 512 bytes of on-chip RAM for stack, variables, and temporary data storage in interrupt-driven systems |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels and 12 µs typical conversion time per sample |
| Bus Frequency | Up to 8 MHz (at 5 V) or 4 MHz (at 3.3 V), defining maximum instruction throughput and peripheral timing margins |
| Supply Voltage | 2.7–5.5 V operation, supporting direct connection to common industrial logic rails without level-shifting |
| Package Type | 20-pin SOIC-W (7.5 mm width), compatible with standard surface-mount reflow processes and manual prototyping |
Pinout & Package
MC68HC908JL8CDW is housed in a 20-pin Small Outline Integrated Circuit – Wide (SOIC-W) package with 0.600-inch body width and 0.050-inch lead pitch. Pin assignments follow JEDEC MS-013AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main positive supply rail (2.7–5.5 V); decoupling capacitor required adjacent to pin for noise immunity |
| VSS | Ground Reference | Digital ground return path; must be connected to system ground plane with low-inductance trace |
| OSC1/XTAL | Clock Input | Crystal amplifier input for external 1–8 MHz quartz resonator; also accepts CMOS clock source |
| OSC2/RCCLK | Clock Output | Crystal amplifier output or internal RC oscillator clock; drives external crystal or feeds system clock tree |
| PTA0/KBI0 | GPIO / KBI Input | Programmable I/O pin with keyboard interrupt capability; enables wake-from-stop on key press |
| PTA1/KBI1 | GPIO / KBI Input | Second KBI-capable pin for row/column scanning in 3×3 or 4×2 keypad interfaces |
| PTD0/AD0 | GPIO / ADC Input | Analog input channel 0; supports single-ended voltage measurement with 0–VDD range |
| PTD1/AD1 | GPIO / ADC Input | Analog input channel 1; shares same ADC hardware and reference as AD0–AD7 |
| PTD2/AD2 | GPIO / ADC Input | Analog input channel 2; usable for temperature sensor, potentiometer, or current-sense feedback |
| PTD3/AD3 | GPIO / ADC Input | Analog input channel 3; supports software-triggered sampling synchronized to system events |
| PTD4/T1CH0 | GPIO / TIM Input Capture | Timer channel 0 input for edge-triggered event capture (e.g., pulse width or period measurement) |
| PTD5/T1CH1 | GPIO / TIM Output Compare | Timer channel 1 output for generating precise digital waveforms or PWM signals |
| PTE0/T2CH0 | GPIO / TIM Input Capture | Timer channel 2 input for secondary timing event capture independent of T1CH0/T1CH1 |
| PTE1/T2CH1 | GPIO / TIM Output Compare | Timer channel 2 output for dual PWM generation or complementary signal pairs |
| RxD/PTA2 | SCI Receive Input | Asynchronous serial data input for full-duplex UART communication at configurable baud rates |
| TxD/PTA3 | SCI Transmit Output | Asynchronous serial data output; open-drain capable when configured for wired-AND bus topologies |
| IRQ/PTA4 | External Interrupt Input | Edge-sensitive interrupt request input; supports wake-from-wait/stop on external asynchronous events |
| RESET | Active-Low Reset | Hardware reset input; asserted low for ≥2 µs initiates cold start with register initialization and vector fetch |
| TEST/PTA5 | Test Mode Entry | Used during programming to enter monitor ROM mode; pulled high during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip Monitor ROM | Enables in-system programming and debugging via SCI without external programmer; supports flash erase/write commands |
| Computer Operating Properly (COP) | Configurable watchdog timer with 2–1024 ms timeout window prevents runaway code execution in safety-critical loops |
| Low-Voltage Inhibit (LVI) | Hardware brownout detector disables CPU when VDD drops below 2.5 V (±0.1 V), preventing erratic behavior during power sag |
| Keyboard Interrupt Module (KBI) | Hardware-accelerated 8-key matrix scan with auto-debounce and interrupt-on-keypress, reducing CPU polling overhead |
| Stop Mode Current | Typical 1.5 µA at 3.3 V and 25°C, enabling battery-powered applications with multi-year standby life |
Applications
| Industrial Sensor Node | Home Appliance Control Panel |
|---|---|
Use Scenario: Standalone temperature/humidity sensor with local display and wireless reporting. IC Role / Device Role / Timing Role: Main controller executing sensor readout, linearization, and UART-based data transmission. Use Value: Integrated 8-bit ADC eliminates external converter; SCI enables direct connection to ESP32 or nRF52 host MCU. | Use Scenario: Keypad-driven user interface for microwave oven or washing machine. IC Role / Device Role / Timing Role: Dedicated front-panel manager handling button scan, LED backlight control, and buzzer feedback. Use Value: Hardware KBI reduces firmware complexity and ensures responsive key detection even during deep sleep. |
| Smart Power Outlet | Legacy Equipment Retrofit Module |
Use Scenario: AC mains monitoring and relay control with energy metering and overcurrent protection. IC Role / Device Role / Timing Role: Real-time supervisor managing zero-cross detection, current sampling, and fail-safe shutdown. Use Value: TIM input capture measures AC line period; COP watchdog guarantees recovery from transient faults. | Use Scenario: Adding digital I/O and serial telemetry to analog-only legacy HVAC controllers. IC Role / Device Role / Timing Role: Protocol translator bridging 4–20 mA inputs to Modbus RTU over RS-485. Use Value: SCI with hardware parity and framing error detection ensures robust communication in electrically noisy environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CDT | RS08 core, 8 KB Flash, 1 KB RAM, no KBI, lower max bus frequency (20 MHz vs. 8 MHz effective HCS08 IPC) | Lacks hardware keyboard interrupt; requires software polling for keypad interfaces | Select when higher code density and lower active power are prioritized over KBI acceleration |
| MC9S08QG8CDT | HCS08 core, 8 KB Flash, 512 B RAM, identical peripheral set but in 16-pin SOIC package | Fewer I/O pins (14 vs. 18 GPIO) and no ADC channel 4–7; limited analog sensing capability | Select when board space is constrained and full 8-channel ADC is not required |
Compared with MC9RS08KA8CDT and MC9S08QG8CDT, the MC68HC908JL8CDW offers unique hardware KBI support and full 8-channel ADC in a 20-pin SOIC-W package - making it optimal for cost-sensitive, keypad- and sensor-rich embedded designs where peripheral offload is critical.
Availability
MC68HC908JL8CDW is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, smart power outlets, and legacy equipment retrofit modules requiring stable component supply and long-term manufacturability.
Supply support for MC68HC908JL8CDW 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MC68HC908JL8CDW belongs to the legacy HCS08 microcontroller family, designed for cost-effective, low-power embedded control in resource-constrained systems with mixed-signal requirements.
FAQ
What is the maximum operating frequency of the MC68HC908JL8CDW?
The MC68HC908JL8CDW supports a maximum bus frequency of 8 MHz at 5 V supply and 4 MHz at 3.3 V. This frequency determines instruction execution speed and peripheral timing - for example, the 8-bit ADC completes conversions in 12 µs at 8 MHz, enabling up to 83 kSPS sampling rate in burst mode. The actual core clock derives from internal prescalers and oscillator configuration, and must remain within datasheet limits to ensure reliable operation of TIM, SCI, and COP modules.
Does the MC68HC908JL8CDW support in-system programming?
Yes, the MC68HC908JL8CDW includes a factory-programmed Monitor ROM that enables in-system programming (ISP) via its SCI interface. Using standard UART commands, users can erase and reprogram the 8 KB Flash memory without removing the device from the PCB. The MC68HC908JL8CDW monitor supports PRGRNGE, ERARNGE, and LDRNGE routines for page-level write, mass erase, and data loading - essential for field firmware updates and production programming.
How many analog input channels does the MC68HC908JL8CDW ADC support?
The MC68HC908JL8CDW integrates an 8-bit successive-approximation ADC with eight single-ended analog input channels (AD0–AD7), all multiplexed onto PTD0–PTD3 and PTE2–PTE5 pins. Each channel supports software-triggered conversions with 12 µs typical acquisition time. The ADC uses the VDD supply as reference and operates across the full 0–VDD input range, making it suitable for direct interfacing with resistive sensors, potentiometers, and conditioned analog signals.
What low-power modes are available on the MC68HC908JL8CDW?
The MC68HC908JL8CDW supports two hardware low-power modes: Wait Mode (CPU halted, peripherals active, ~100 µA typical at 3.3 V) and Stop Mode (all clocks disabled except LVI and IRQ, ~1.5 µA typical). Both modes retain RAM contents and allow wake-up via IRQ, KBI, or SCI activity. Stop Mode is especially valuable in battery-powered applications like remote sensors, where extended standby duration is required between periodic measurements or transmissions.
Is the MC68HC908JL8CDW pin-compatible with other HCS08 family members?
No, the MC68HC908JL8CDW is not pin-compatible with other HCS08 variants such as MC9S08QG8 or MC9S08AW60. It uses a unique 20-pin SOIC-W package with specific peripheral pin mappings - for example, PTD4/T1CH0 and PTE0/T2CH0 are assigned to Timer 1 and Timer 2 channels respectively, differing from pinouts in larger or smaller HCS08 derivatives. Migration requires PCB layout revision and firmware adaptation to match new I/O assignments and register offsets.
MC68HC908JL8CDW 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:
- SCI
- Peripherals:
- LED, LVD, POR, PWM
- Number of I/O:
- 23
- 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 13x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908JL8CDW FAQ
1.How can I place an order for MC68HC908JL8CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908JL8CDW 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 MC68HC908JL8CDW reliable?
The price and inventory of MC68HC908JL8CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908JL8CDW is usually 5 days.
3.What payment methods are accepted for MC68HC908JL8CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908JL8CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908JL8CDW?
MC68HC908JL8CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908JL8CDW 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 MC68HC908JL8CDW?
For technical support, including MC68HC908JL8CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908JL8CDW requirements.
6.How does Aetrix verify that MC68HC908JL8CDW is sourced from the original manufacturer or authorized distributors?
All MC68HC908JL8CDW 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 MC68HC908JL8CDW meets industry standards.
7.What is the process for return or replacement of MC68HC908JL8CDW?
All MC68HC908JL8CDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908JL8CDW, 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 MC68HC908JL8CDW part is unused and in its original packaging.
Return procedure for MC68HC908JL8CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MC68HC908JL8CDW Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
