MC68HC908LJ24CFQ - 8-Bit HC08 MCU 24KB Flash 8MHz 80-QFP | NXP
Teilenummer: MC68HC908LJ24CFQ ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 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 Übersicht
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.
Drop-in-Alternativen für MC68HC908LJ24CFQ – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MC68HC908LJ24CFQ (gleiche Bauform und Footprint) – abweichend in Peripherals.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MC68HC908LK24CFQ
✅ Drop-In✓ Auf Lager
$10.95 / Stück
Datenblatt ansehen →MC68HC908LJ24CFUE
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MC68HC908LJ24CFB
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MC68HC908LJ24CFQ Grenzwerte & elektrische Eigenschaften
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Maximale Taktfrequenz | 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 |
| Gehäuse | 80-QFP (14x14 mm) |
| Montageart | Surface Mount |
| Part Status | Obsolete |
| Program Memory Type | FLASH |
MC68HC908LJ24CFQ Pin-Konfiguration
| Pin 1 | OSC1 — Crystal oscillator input |
| Pin 2 | OSC2 — Crystal oscillator output |
| Pin 3 | PTA0 — Port A bit 0 (general I/O) |
| Pin 4 | PTA1 — Port A bit 1 (general I/O) |
| Pin 5 | PTA2 — Port A bit 2 (general I/O) |
| Pin 6 | PTA3 — Port A bit 3 (general I/O) |
| Pin 7 | PTA4 — Port A bit 4 (general I/O) |
| Pin 8 | PTA5 — Port A bit 5 (general I/O) |
| Pin 9 | PTA6 — Port A bit 6 (general I/O) |
| Pin 10 | PTA7 — Port A bit 7 (general I/O) |
| Pin 11 | VSS — Ground |
| Pin 12 | VDD — Positive supply |
| Pin 13 | PTB0 — Port B bit 0 (general I/O) |
| Pin 14 | PTB1 — Port B bit 1 (general I/O) |
| Pin 15 | PTB2 — Port B bit 2 (general I/O) |
| Pin 16 | PTB3 — Port B bit 3 (general I/O) |
| Pin 17 | PTB4 — Port B bit 4 (general I/O) |
| Pin 18 | PTB5 — Port B bit 5 (general I/O) |
| Pin 19 | PTB6 — Port B bit 6 (general I/O) |
| Pin 20 | PTB7 — Port B bit 7 (general I/O) |
| Pin 21 | PTC0 — Port C bit 0 (general I/O) |
| Pin 22 | PTC1 — Port C bit 1 (general I/O) |
| Pin 23 | PTC2 — Port C bit 2 (general I/O) |
| Pin 24 | PTC3 — Port C bit 3 (general I/O) |
| Pin 25 | PTC4 — Port C bit 4 (general I/O) |
| Pin 26 | PTC5 — Port C bit 5 (general I/O) |
| Pin 27 | PTC6 — Port C bit 6 (general I/O) |
| Pin 28 | PTC7 — Port C bit 7 (general I/O) |
| Pin 29 | PTD0 — Port D bit 0 (general I/O) |
| Pin 30 | PTD1 — Port D bit 1 (general I/O) |
| Pin 31 | PTD2 — Port D bit 2 (general I/O) |
| Pin 32 | PTD3 — Port D bit 3 (general I/O) |
| Pin 33 | PTD4 — Port D bit 4 (general I/O) |
| Pin 34 | PTD5 — Port D bit 5 (general I/O) |
| Pin 35 | PTD6 — Port D bit 6 (general I/O) |
| Pin 36 | PTD7 — Port D bit 7 (general I/O) |
| Pin 37 | PTE0 — Port E bit 0 (general I/O) |
| Pin 38 | PTE1 — Port E bit 1 (general I/O) |
| Pin 39 | PTE2 — Port E bit 2 (general I/O) |
| Pin 40 | PTE3 — Port E bit 3 (general I/O) |
| Pin 41 | PTE4 — Port E bit 4 (general I/O) |
| Pin 42 | PTE5 — Port E bit 5 (general I/O) |
| Pin 43 | PTE6 — Port E bit 6 (general I/O) |
| Pin 44 | PTE7 — Port E bit 7 (general I/O) |
| Pin 45 | PTF0 — Port F bit 0 (general I/O) |
| Pin 46 | PTF1 — Port F bit 1 (general I/O) |
| Pin 47 | PTF2 — Port F bit 2 (general I/O) |
| Pin 48 | PTF3 — Port F bit 3 (general I/O) |
| Pin 49 | PTF4 — Port F bit 4 (general I/O) |
| Pin 50 | PTF5 — Port F bit 5 (general I/O) |
| Pin 51 | PTF6 — Port F bit 6 (general I/O) |
| Pin 52 | PTF7 — Port F bit 7 (general I/O) |
| Pin 53 | PTG0 — Port G bit 0 (general I/O) |
| Pin 54 | PTG1 — Port G bit 1 (general I/O) |
| Pin 55 | PTG2 — Port G bit 2 (general I/O) |
| Pin 56 | PTG3 — Port G bit 3 (general I/O) |
| Pin 57 | PTG4 — Port G bit 4 (general I/O) |
| Pin 58 | PTG5 — Port G bit 5 (general I/O) |
| Pin 59 | PTG6 — Port G bit 6 (general I/O) |
| Pin 60 | PTG7 — Port G bit 7 (general I/O) |
| Pin 61 | LCD0 — LCD segment line 0 |
| Pin 62 | LCD1 — LCD segment line 1 |
| Pin 63 | LCD2 — LCD segment line 2 |
| Pin 64 | LCD3 — LCD segment line 3 |
| Pin 65 | LCD4 — LCD segment line 4 |
| Pin 66 | LCD5 — LCD segment line 5 |
| Pin 67 | LCD6 — LCD segment line 6 |
| Pin 68 | LCD7 — LCD segment line 7 |
| Pin 69 | LCD8 — LCD segment line 8 |
| Pin 70 | LCD9 — LCD segment line 9 |
| Pin 71 | LCD10 — LCD segment line 10 |
| Pin 72 | LCD11 — LCD segment line 11 |
| Pin 73 | BP0 — LCD backplane 0 |
| Pin 74 | BP1 — LCD backplane 1 |
| Pin 75 | BP2 — LCD backplane 2 |
| Pin 76 | BP3 — LCD backplane 3 |
| Pin 77 | RST — Reset (active low) |
| Pin 78 | IRQ — External interrupt request |
| Pin 79 | VSS — Ground |
| Pin 80 | VDD — Positive supply |
Typische Anwendungen
MC68HC908LJ24CFQ ist geeignet für 6 Anwendungs: 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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
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.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MC68HC908LJ24CFQ – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | 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 |
Wichtigste Unterscheidungsmerkmale
- 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))
Designhinweise
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.
Compliance-Informationen
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.