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NXP Semiconductors MC908JB8JDWER
- Part No.:
- MC908JB8JDWER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC908JB8JDWER.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,729
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Product details
Overview
MC908JB8JDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB on-chip Flash memory, 512 B RAM, and integrated USB 1.1 low-speed device interface. It operates at up to 8 MHz bus frequency, supports 5 V operation, and features a 16-bit TIM module with input capture, output compare, and PWM. It is used in embedded USB peripheral controllers such as HID devices, firmware-upgradable sensors, and industrial configuration interfaces.
For engineers reviewing the MC908JB8JDWER datasheet, MC908JB8JDWER pinout, MC908JB8JDWER application, or MC908JB8JDWER equivalent, key selection criteria include its native USB transceiver (no external PHY required), ROM-resident monitor for in-system programming, 20-pin SOIC package, and support for COP watchdog and LVI brown-out protection - all critical for cost-sensitive, field-programmable USB endpoints.
Technical Context
The MC908JB8JDWER implements the HCS08 CPU core with enhanced addressing modes and a 16-level hardware stack. Its USB module complies with USB Specification Rev 1.1 for low-speed (1.5 Mbps) device-only operation, using internal voltage regulation and differential D+/D− signaling via PTE3/D+ and PTE4/D− pins.
It integrates a System Integration Module (SIM) for clock generation, reset management, and interrupt control; a Timer Interface Module (TIM) with two 16-bit channels; and five I/O ports (A–E) with configurable pull-ups and keyboard interrupt capability. The MCU boots from internal Flash and supports background monitor ROM-based debugging and programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-level hardware stack and indexed addressing - enables compact firmware and deterministic interrupt latency. |
| Flash Memory | 8 KB on-chip Flash with block erase and program capability - supports field firmware updates without external programmer. |
| RAM | 512 bytes of on-chip RAM - sufficient for USB descriptor handling, HID report buffers, and real-time control variables. |
| USB Interface | Integrated USB 1.1 low-speed device controller (1.5 Mbps), no external PHY required - reduces BOM count and PCB area. |
| Operating Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic systems and legacy industrial power rails. |
| Max Bus Frequency | 8 MHz - delivers sufficient throughput for USB token processing, sensor polling, and local control loops. |
| Package | 20-pin SOIC (case 751BD-03) - industry-standard footprint enabling drop-in replacement and automated assembly. |
Pinout & Package
MC908JB8JDWER is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package per case outline 751BD-03, with 0.3 inch body width and 0.050 inch lead pitch. Thermal and mechanical data confirm JEDEC MS-013AC compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply (5 V) | Main digital supply rail; requires local 0.1 µF decoupling near pin. |
| VSS | Ground reference | Digital ground return path; must be low-impedance connection to system GND plane. |
| OSC1 / OSC2 | Crystal oscillator inputs | Supports 1–8 MHz crystal or ceramic resonator; internal feedback amplifier enables self-contained clock source. |
| RST | Active-low reset input | Asynchronous reset pin; internal pull-up ensures valid state on power-up; accepts external push-button or supervisor IC signal. |
| PTE3/D+ | USB differential data positive | Direct connection to USB D+ line; internal 1.5 kΩ pull-up enabled automatically during USB enumeration. |
| PTE4/D− | USB differential data negative | Direct connection to USB D− line; forms full-duplex low-speed USB physical layer with PTE3/D+. |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit general-purpose port with individual direction control; supports keyboard interrupt (KBI) scanning on all pins. |
| PTB0–PTB7 | Port B bidirectional I/O | 8-bit port with weak pull-ups; usable for GPIO, LED drive (sink only), or analog input when configured as ADC channel. |
Key Features
| Feature | Design Value |
|---|---|
| ROM-resident Monitor (MON) | Enables UART-based in-system programming and debug via single-wire interface - eliminates need for dedicated debug header or external programmer. |
| USB Low-Speed Device Controller | Full hardware implementation of USB 1.1 device stack including endpoint 0 control transfers and suspend/resume - no firmware USB stack required. |
| Computer Operating Properly (COP) Watchdog | Configurable timeout (0.5 ms to 1.0 s) with independent clock source - prevents runaway code in unattended USB peripherals. |
| Low-Voltage Inhibit (LVI) | Detects supply drops below 4.2 V and triggers reset - ensures reliable Flash write/erase and USB transaction integrity during brown-out. |
| Keyboard Interrupt Module (KBI) | Scans up to 8 keys on Port A with automatic wake-from-wait on press - ideal for low-power HID devices like programmable buttons or dials. |
Applications
| USB Human Interface Device (HID) | Industrial Field Configurator |
|---|---|
Use Scenario: A programmable rotary encoder with push-button sends position and click events to a host PC. IC Role / Device Role / Timing Role: MC908JB8JDWER acts as a USB HID class-compliant device, managing encoder quadrature decoding, button debouncing, and report packet formatting. Use Value: Native USB interface eliminates external transceiver; MON ROM enables over-the-air firmware updates via vendor-specific control transfers. |
Use Scenario: A DIN-rail mounted sensor node allows technicians to reconfigure measurement ranges and calibration offsets via USB. IC Role / Device Role / Timing Role: MC908JB8JDWER serves as the USB command interpreter and nonvolatile parameter manager, interfacing with EEPROM or Flash sectors. Use Value: 8 KB Flash stores both application firmware and user-configurable parameters; LVI prevents corruption during field power cycling. |
| USB Firmware-Upgradable Sensor | Legacy RS-232 to USB Bridge |
Use Scenario: A temperature/humidity sensor with USB connectivity receives new calibration coefficients or sensor fusion algorithms in the field. IC Role / Device Role / Timing Role: MC908JB8JDWER hosts the sensor driver, USB descriptor engine, and Flash update handler - no host-side driver needed. Use Value: ROM-resident monitor allows safe reprogramming even if application firmware is corrupted; TIM module provides precise timing for sensor sampling intervals. |
Use Scenario: An adapter converts legacy RS-232 serial commands from lab equipment into USB CDC ACM packets for modern PCs. IC Role / Device Role / Timing Role: MC908JB8JDWER implements USB CDC class with UART emulation, buffering incoming/outgoing byte streams. Use Value: Integrated USB PHY and 512 B RAM enable efficient double-buffered serial-to-USB translation without external FIFO or level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller-with-integrated-USB applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908JB16CDWE | 16 KB Flash, same 20-pin SOIC package, identical USB and peripheral set - higher code capacity only. | Required where firmware exceeds 8 KB or future feature expansion is anticipated. | Select when additional Flash headroom is needed without changing PCB layout or driver stack. |
| MC9S08GB60A | S08 core, 60 KB Flash, 4 KB RAM, USB 2.0 full-speed (12 Mbps), 44-pin QFP - not pin-compatible. | Used in higher-bandwidth USB applications (e.g., audio streaming, mass storage) requiring larger memory and faster transfer rates. | Choose for next-generation designs needing full-speed USB or extended memory; requires board redesign. |
Compared with MC908JB8JDWER, MC908JB16CDWE offers direct scalability within the same footprint and toolchain, while MC9S08GB60A provides full-speed USB and greater resources at the cost of package and layout change - making MC908JB8JDWER optimal for cost-constrained, low-speed USB peripheral designs.
Availability
MC908JB8JDWER is available at Aetrix Electronics and suitable for USB HID devices, industrial field configurators, and firmware-upgradable sensor nodes requiring stable component supply across long-lifecycle embedded programs.
Supply support for MC908JB8JDWER 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 HCS08 family - including MC908JB8JDWER - was designed for cost-sensitive, USB-enabled embedded peripherals requiring robustness, field programmability, and minimal external components.
FAQ
Does MC908JB8JDWER require an external USB transceiver?
No. MC908JB8JDWER integrates a compliant USB 1.1 low-speed transceiver with internal D+ pull-up and differential receiver circuitry. Only passive ESD protection and series resistors (as specified in Freescale AN2295) are needed on PTE3/D+ and PTE4/D− lines - no external PHY chip is required for basic USB device operation.
What debug and programming interfaces does MC908JB8JDWER support?
MC908JB8JDWER supports in-circuit debugging and programming via its ROM-resident Monitor (MON) accessed through the SCI interface (PTA1/PTA2), and also via the Background Debug Mode (BDM) interface using BKGD and RESET pins. Both methods allow full read/write access to Flash and RAM without requiring special bootloaders.
Can MC908JB8JDWER operate from a 3.3 V supply?
No. MC908JB8JDWER is specified for 4.5 V to 5.5 V operation only. Its internal voltage regulator, USB transceiver, and Flash programming circuitry are designed for 5 V logic levels. Using 3.3 V will result in undefined behavior, failed USB enumeration, and inability to program Flash memory.
Is there a migration path from MC908JB8JDWER to a newer NXP MCU?
Yes. The S08GB family (e.g., MC9S08GB60A) maintains architectural compatibility with the HCS08 core and offers USB 2.0 full-speed, larger memory, and enhanced peripherals. However, it uses a 44-pin QFP package and different pin mapping - migration requires PCB redesign but preserves most firmware logic and toolchain familiarity.
How is USB device enumeration handled in MC908JB8JDWER?
MC908JB8JDWER performs full USB device enumeration autonomously using its hardware USB module and built-in descriptor tables stored in Flash. The ROM-resident Monitor provides default descriptors, while custom descriptors can be programmed into designated Flash sectors - no runtime descriptor generation is needed in application firmware.
MC908JB8JDWER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 3MHz
- Connectivity:
- USB
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 13
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908JB8JDWER FAQ
1.How can I place an order for MC908JB8JDWER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908JB8JDWER 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 MC908JB8JDWER reliable?
The price and inventory of MC908JB8JDWER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908JB8JDWER is usually 5 days.
3.What payment methods are accepted for MC908JB8JDWER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908JB8JDWER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908JB8JDWER?
MC908JB8JDWER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908JB8JDWER 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 MC908JB8JDWER?
For technical support, including MC908JB8JDWER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908JB8JDWER requirements.
6.How does Aetrix verify that MC908JB8JDWER is sourced from the original manufacturer or authorized distributors?
All MC908JB8JDWER 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 MC908JB8JDWER meets industry standards.
7.What is the process for return or replacement of MC908JB8JDWER?
All MC908JB8JDWER units undergo pre-shipment inspection (PSI). If there is an issue with MC908JB8JDWER, 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 MC908JB8JDWER part is unused and in its original packaging.
Return procedure for MC908JB8JDWER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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