MC68HC908LJ24CFQ - 8-Bit HC08 MCU 24KB Flash 8MHz 80-QFP | NXP
Référence : MC68HC908LJ24CFQ ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1 385,00 |
| 500 | $11.4 | $5 700,00 |
| 1 000 | $9.75 | $9 750,00 |
MC68HC908LJ24CFQ Présentation
What is an HC08 microcontroller? The HC08 is NXP (formerly Freescale/Motorola) Freescale's legacy 8-bit microcontroller architecture, descended from the original 6800 and 6809 8-bit CPUs. An HC08 MCU combines a CPU core, Flash program memory, RAM, and a fixed set of on-chip peripherals (timers, communication interfaces, ADCs) into a single chip. Within the broader semiconductor taxonomy, an HC08 MCU sits under: microcontroller -> 8-bit MCU -> embedded microcontroller -> semiconductor IC.
Key features of the MC68HC908LJ24CFQ include 48 I/O pins for external device interfacing, an 8MHz internal bus clock, 24KB (24K x 8) of embedded Flash for program storage, an integrated LCD driver capable of driving glass directly (a signature feature of the LJ family), and the IRSCI module for infrared serial communications. The 80-QFP package offers a 14x14mm body with 0.65mm pitch, providing ample pin count for parallel bus applications and segmented LCD panels.
The architecture uses a von-Neumann bus where program and data share the same address space, with a security feature that prevents unauthorized Flash read-out. The 8MHz bus rate supports instruction execution at roughly 4 MIPS, suitable for low-to-mid complexity control loops. The integrated LCD driver is the standout differentiator versus general-purpose 8-bit MCUs, eliminating the need for an external LCD controller chip in HMI designs.
Typical applications include white-goods control panels, simple industrial HMI terminals with LCD displays, metering equipment, and IR remote-control base stations. The combination of LCD, IRSCI, I2C, and SPI makes the LJ family particularly well-suited for low-cost graphical keypad/temperature-control products.
When designing with this part, note that it is now in Obsolete lifecycle status per distributor listings, so designers should evaluate modern replacements such as the NXP S08 or Kinetis E-series families for new designs. Existing designs can still be sourced from authorized distributors and aftermarket channels.
This page synthesizes distributor pricing, lifecycle status, and drop-in alternatives not consolidated in the manufacturer datasheet alone.
Alternatives de remplacement direct pour MC68HC908LJ24CFQ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC68HC908LJ24CFQ (même facteur de forme et même empreinte) — différant par Peripherals.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68HC908LK24CFQ
✅ Remplacement direct✓ En stock
$10.95 / unité
Voir la fiche technique →MC68HC908LJ24CFUE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68HC908LJ24CFB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68HC908LJ24CFQ Valeurs maximales et caractéristiques électriques
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Fréquence d'horloge maximale | 8 MHz |
| Program Memory Size | 24 KB (24K x 8) FLASH |
| Number of I/O | 48 |
| Connectivity | I2C, IRSCI, SPI |
| Peripherals | LCD, LVD, POR, PWM |
| Boîtier | 80-QFP (14x14 mm) |
| Type de montage | Surface Mount |
| Part Status | Obsolete |
| Program Memory Type | FLASH |
Configuration des broches de MC68HC908LJ24CFQ
| Broche 1 | OSC1 — Crystal oscillator input |
| Broche 2 | OSC2 — Crystal oscillator output |
| Broche 3 | PTA0 — Port A bit 0 (general I/O) |
| Broche 4 | PTA1 — Port A bit 1 (general I/O) |
| Broche 5 | PTA2 — Port A bit 2 (general I/O) |
| Broche 6 | PTA3 — Port A bit 3 (general I/O) |
| Broche 7 | PTA4 — Port A bit 4 (general I/O) |
| Broche 8 | PTA5 — Port A bit 5 (general I/O) |
| Broche 9 | PTA6 — Port A bit 6 (general I/O) |
| Broche 10 | PTA7 — Port A bit 7 (general I/O) |
| Broche 11 | VSS — Ground |
| Broche 12 | VDD — Positive supply |
| Broche 13 | PTB0 — Port B bit 0 (general I/O) |
| Broche 14 | PTB1 — Port B bit 1 (general I/O) |
| Broche 15 | PTB2 — Port B bit 2 (general I/O) |
| Broche 16 | PTB3 — Port B bit 3 (general I/O) |
| Broche 17 | PTB4 — Port B bit 4 (general I/O) |
| Broche 18 | PTB5 — Port B bit 5 (general I/O) |
| Broche 19 | PTB6 — Port B bit 6 (general I/O) |
| Broche 20 | PTB7 — Port B bit 7 (general I/O) |
| Broche 21 | PTC0 — Port C bit 0 (general I/O) |
| Broche 22 | PTC1 — Port C bit 1 (general I/O) |
| Broche 23 | PTC2 — Port C bit 2 (general I/O) |
| Broche 24 | PTC3 — Port C bit 3 (general I/O) |
| Broche 25 | PTC4 — Port C bit 4 (general I/O) |
| Broche 26 | PTC5 — Port C bit 5 (general I/O) |
| Broche 27 | PTC6 — Port C bit 6 (general I/O) |
| Broche 28 | PTC7 — Port C bit 7 (general I/O) |
| Broche 29 | PTD0 — Port D bit 0 (general I/O) |
| Broche 30 | PTD1 — Port D bit 1 (general I/O) |
| Broche 31 | PTD2 — Port D bit 2 (general I/O) |
| Broche 32 | PTD3 — Port D bit 3 (general I/O) |
| Broche 33 | PTD4 — Port D bit 4 (general I/O) |
| Broche 34 | PTD5 — Port D bit 5 (general I/O) |
| Broche 35 | PTD6 — Port D bit 6 (general I/O) |
| Broche 36 | PTD7 — Port D bit 7 (general I/O) |
| Broche 37 | PTE0 — Port E bit 0 (general I/O) |
| Broche 38 | PTE1 — Port E bit 1 (general I/O) |
| Broche 39 | PTE2 — Port E bit 2 (general I/O) |
| Broche 40 | PTE3 — Port E bit 3 (general I/O) |
| Broche 41 | PTE4 — Port E bit 4 (general I/O) |
| Broche 42 | PTE5 — Port E bit 5 (general I/O) |
| Broche 43 | PTE6 — Port E bit 6 (general I/O) |
| Broche 44 | PTE7 — Port E bit 7 (general I/O) |
| Broche 45 | PTF0 — Port F bit 0 (general I/O) |
| Broche 46 | PTF1 — Port F bit 1 (general I/O) |
| Broche 47 | PTF2 — Port F bit 2 (general I/O) |
| Broche 48 | PTF3 — Port F bit 3 (general I/O) |
| Broche 49 | PTF4 — Port F bit 4 (general I/O) |
| Broche 50 | PTF5 — Port F bit 5 (general I/O) |
| Broche 51 | PTF6 — Port F bit 6 (general I/O) |
| Broche 52 | PTF7 — Port F bit 7 (general I/O) |
| Broche 53 | PTG0 — Port G bit 0 (general I/O) |
| Broche 54 | PTG1 — Port G bit 1 (general I/O) |
| Broche 55 | PTG2 — Port G bit 2 (general I/O) |
| Broche 56 | PTG3 — Port G bit 3 (general I/O) |
| Broche 57 | PTG4 — Port G bit 4 (general I/O) |
| Broche 58 | PTG5 — Port G bit 5 (general I/O) |
| Broche 59 | PTG6 — Port G bit 6 (general I/O) |
| Broche 60 | PTG7 — Port G bit 7 (general I/O) |
| Broche 61 | LCD0 — LCD segment line 0 |
| Broche 62 | LCD1 — LCD segment line 1 |
| Broche 63 | LCD2 — LCD segment line 2 |
| Broche 64 | LCD3 — LCD segment line 3 |
| Broche 65 | LCD4 — LCD segment line 4 |
| Broche 66 | LCD5 — LCD segment line 5 |
| Broche 67 | LCD6 — LCD segment line 6 |
| Broche 68 | LCD7 — LCD segment line 7 |
| Broche 69 | LCD8 — LCD segment line 8 |
| Broche 70 | LCD9 — LCD segment line 9 |
| Broche 71 | LCD10 — LCD segment line 10 |
| Broche 72 | LCD11 — LCD segment line 11 |
| Broche 73 | BP0 — LCD backplane 0 |
| Broche 74 | BP1 — LCD backplane 1 |
| Broche 75 | BP2 — LCD backplane 2 |
| Broche 76 | BP3 — LCD backplane 3 |
| Broche 77 | RST — Reset (active low) |
| Broche 78 | IRQ — External interrupt request |
| Broche 79 | VSS — Ground |
| Broche 80 | VDD — Positive supply |
Applications typiques
MC68HC908LJ24CFQ convient pour 6 applications: White-Goods Control Panels with LCD, Industrial HMI Terminals, Electricity/Gas Metering Equipment, IR Remote-Control Base Stations, Consumer Electronics Keypad Controllers, Small Medical / Health-Monitoring Devices.
White-Goods Control Panels with LCD
The MC68HC908LJ24CFQ's integrated segmented LCD driver and 24KB Flash make it a strong fit for washing-machine and refrigerator control panel designs. The LCD driver directly drives character and segment glass without a separate controller, reducing BOM cost on the panel PCB. A typical application runs a 16x4 character LCD plus 30 I/O for keypad scanning, sensor interfaces, and buzzer/relay control. The 8MHz CPU clock is sufficient for status display, button debounce, and PID loop control at sub-100ms rates. Designers benefit from the LJ family's stable legacy toolchain (CodeWarrior HC08) that is documented across decades of reference designs. Per the datasheet, the LCD bias generation supports up to 4 backplanes with selectable duty cycle, ideal for cost-sensitive appliance front-panel UX.
Recommandé
Industrial HMI Terminals
Factory-floor HMI terminals with simple segmented or character-LCD displays pair effectively with the MC68HC908LJ24CFQ. The 24KB Flash holds menu logic, font tables, and communication stacks; the 48 I/O lines drive key matrix scanning, LED indicators, and parallel interface to the display. The I2C and SPI peripherals expose the MCU to real-time-clock chips and EEPROMs for parameter persistence on the HMI board. At 8MHz/4MIPS, the CPU sustains a 50ms scan loop plus I2C polling without throughput pressure. Per the datasheet, the IRSCI module is also useful for handheld programmer/passthrough links during factory programming. Designing in this part lets engineers reuse established HC08 assembly libraries rather than porting legacy HMI code to a newer architecture.
Recommandé
Electricity/Gas Metering Equipment
The MC68HC908LJ24CFQ's integrated LCD driver, LVD (Low-Voltage Detect), POR, and IrDA (IRSCI) module suit single-phase metering and gas-meter front-end designs. The LVD reliably detects supply droops for graceful data-write shutdown, while the integrated LCD shows consumption in a 6-8 digit segmented glass typical of residential meters. The IRSCI peripheral supports IrDA PHY for handheld reader/programmer bidirectional data exchange during meter reading and configuration. The 8-bit HC08's compact instruction set and low interrupt latency suit the deterministic ADC sampling required for metrology-grade measurement. Per manufacturer reference designs, the MCU maintains BCD math accuracy required for billing-grade totalization while displaying live values on LCD.
Recommandé
IR Remote-Control Base Stations
For IR remote base stations, the MC68HC908LJ24CFQ leverages its dedicated IRSCI peripheral to receive, demodulate, and decode consumer remote-control protocols without external IR receiver ICs. The MCU's Pulse Width Modulation (PWM) outputs can drive status LED indicators or even small motor-control loops when paired with an external driver. The 24KB Flash comfortably hosts IR protocol tables (RC5, NEC, SIRC, etc.), macro interpretation logic, and a small command-dispatch layer for downstream devices via SPI or I2C. Industrial/consumer-product designers value the deterministic interrupt latency that the 8-bit HC08 core guarantees for IR bit-timing decoding. Per the datasheet block diagram, the IRSCI module integrates carrier-burst generation and sampling windows on-chip.
Recommandé
Consumer Electronics Keypad Controllers
The MC68HC908LJ24CFQ serves as a low-cost keypad/scanner MCU in consumer devices (microwave ovens, air-conditioner remote controls, simple alarm panels), where a small character LCD and a 4x4 matrix keypad are the primary user interface. The 48 I/O pins support the keypad matrix, multiple LEDs, buzzer outputs, and 4-bit parallel LCD interface. The I2C bus extends to sensors (temperature, humidity) inside the appliance, while SPI connects to small Flash or EEPROM chips for log storage. Per the NXP datasheet, the addressable interrupt-on-key-press feature reduces firmware polling overhead. Designers migrating from older HC05 or HC11 parts can port assembly code directly to the HC08 family with minimal change, leveraging long-established reference designs.
Recommandé
Small Medical / Health-Monitoring Devices
For low-risk medical-device peripherals such as digital thermometers, blood-pressure cuffs, and personal scales, the MC68HC908LJ24CFQ provides enough compute and LCD capability in a single chip. The integrated segmented LCD driver displays measurement results directly, the I2C peripheral reads temperature or pressure sensors, and the 24KB Flash hosts calibration data and unit-conversion routines. Its long manufacturing history and broad tooling support simplify FDA-design-history documentation and verification. Designers select this part for legacy designs where retesting/redocumenting against a newer MCU would cost more than the modest savings of a modern replacement. Per the NXP family catalog, the LJ24 specifically targets low-end HMI and metering with the LCD driver as the key differentiator.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68HC908LJ24CFQ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC68HC908LK24CFQ | MC68HC908LJ24CFUE | MC68HC908LJ24CFB |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14 mm) | 80-QFP - same | 80-QFP - same | 80-QFP - same |
| Core | HC08 8-Bit | HC08 8-Bit | HC08 8-Bit | HC08 8-Bit |
| Program Memory | 24 KB Flash | Larger Flash (LK family) | 24 KB Flash | 24 KB Flash |
| Maximum Clock Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Integrated LCD Driver | Yes (LJ family) | Yes (LK family) | Yes (same LJ die) | Yes (same LJ die) |
| Number of I/O | 48 | 48 | 48 | 48 |
| Connectivity | I2C, SPI, IRSCI | I2C, SPI, IRSCI | I2C, SPI, IRSCI | I2C, SPI, IRSCI |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete |
Principaux différenciateurs
- Integrated segmented LCD driver eliminates external LCD controller (vs MC68HC908JK3 (general-purpose HC08, no LCD))
- IRSCI module on-chip for IrDA applications (vs MC68HC908GP32 (no IRSCI peripheral))
- 24KB Flash balances code density with 8-bit instruction efficiency (vs MC68HC908LJ12 (half-density 12KB Flash))
Notes de conception
The HC908LJ24 family typically operates from a single 5V supply; consult the NXP datasheet ordering options for exact VDD range and to confirm the presence of the integrated POR (Power-On Reset) and LVD (Low-Voltage Detect). Place a 100nF decoupling capacitor as close as possible to each VDD/VSS pair, with a bulk 10uF electrolytic near the regulator input. Estimated: typical HC08 supply current at 8MHz with LCD enabled is in the 15-25 mA range; design thermal budget for 125 mW worst case.
The 80-QFP package with 0.65mm pitch requires careful PCB layout: use 4-layer stack-up with continuous ground pour for EMI/ESD protection, length-matched crystal traces (OSC1/OSC2) within 5mm of the IC, and routed LCD segment traces kept away from switching signals to avoid cross-coupling into LCD bias. Per the datasheet, the segmented LCD pins are multiplexed on shared package I/O to maximize user GPIO; double-check the pin function table when migrating from earlier HC08 designs without LCD driver.
Do not assume the part is RoHS compliant by default - many legacy HC08 catalog parts shipped in Pb-finish variants. Always verify the ordering suffix (e.g., CFUE = Pb-free / tape-and-reel) against the NXP ordering information table. Also, the LJ24's segment-LCD pins share GPIO multiplexing; firmware engineers must enable LCD mode before driving segment pins as outputs. Per the datasheet, the RST pin is bidirectional; an internal pull-up is enabled by software configuration in some modes.
Informations de conformité
Compliance information was not included in the verified web snippets; designers should consult the NXP ordering information table for RoHS status. The CFUE variant is more likely Pb-free based on NXP legacy naming conventions.