MC908LJ24CFQE - 8-Bit HC08 MCU, 24KB Flash, 8MHz, 80-QFP | NXP
Référence : MC908LJ24CFQE ⚠ Dernier achat| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.46 | $6,46 |
| 10 | $5.81 | $58,10 |
| 100 | $5.16 | $516,00 |
| 500 | $4.65 | $2 325,00 |
| 1 000 | $4.2 | $4 200,00 |
MC908LJ24CFQE Présentation
An 8-bit microcontroller is a single-chip computer that integrates a CPU, program memory (FLASH/ROM), data memory (RAM), and peripheral set on a single silicon die. The Freescale/NXP HC08 architecture is the successor to the venerable M68HC05 and shares the M68HC08 CPU08 core, offering a richer instruction set, indexed addressing, and a low-power STOP/WAIT mode. Microcontrollers sit hierarchically at MCU -> 8-bit MCU -> embedded controller -> semiconductor; the HC08LJ specifically is a CSIC (customer-specific integrated circuit) variant of the broader M68HC08 family. The 'LJ' suffix denotes a member of the HC08LJ sub-family designed for LCD-drive and general-purpose applications.
Key features of the MC908LJ24CFQE include 24KB of in-system programmable FLASH, 768 bytes of on-chip RAM, 48 general-purpose I/O lines, an 8MHz internal bus, a low-power STOP and WAIT mode, a multi-source interrupt controller, a 16-bit timer with channel selection, a serial communications interface (SCI), a serial peripheral interface (SPI), and an LCD driver suitable for direct segment driving. The chip operates across a broad voltage range typical for the HC08 family and includes a security bit that prevents unauthorized FLASH read-back.
The HC08 CPU08 core executes most instructions in two bus cycles and supports multiply/accumulate operations useful for low-speed analog closed-loop control. The 48 I/O pins share package pins with on-chip peripheral functions, and the LCD driver borrows segments from selected I/O lines in 4-mux and 8-mux configurations. The 80-QFP (14x14) footprint follows the standard JEDEC QFP family outline and exposes all functions through 80 surface-mount leads.
Typical applications include low-end consumer white goods such as washing machines and microwave ovens, LCD-driven home appliances, simple metering and instrumentation equipment, automotive body and HVAC peripherals, and remote-control or sensor-interface boards. The wide operating voltage and internal oscillator support a low external component count, making the part attractive in cost-engineered designs.
Design consideration: when migrating legacy HC05 code to HC08, evaluate the new STOP mode behavior and the additional BIH/BIL branch instructions. Use a 10k pull-up on the RESET pin and place a 100nF decoupling capacitor on each VDD/VSS pair adjacent to the package.
This page synthesizes distributor pricing from DigiKey, Mouser, and LCSC, lists verified 80-QFP drop-in alternatives for legacy designs, and offers PCB-layout and code-migration notes beyond the manufacturer datasheet content.
Alternatives de remplacement direct pour MC908LJ24CFQE — 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 MC908LJ24CFQE (même facteur de forme et même empreinte) — différant par Core Architecture, LCD Driver, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MCHC908LK24CFQE
✅ Remplacement direct✓ En stock
$4.25 / unité
Voir la fiche technique →MC908LJ24CFUE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC908AB32CFUE
✅ Remplacement direct✓ En stock
Contactez-nous pour le prix
Voir la fiche technique →MC68HC908LJ12CFUE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC908LJ24CFBE
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC908LJ24CFQE Valeurs maximales et caractéristiques électriques
| Core Architecture | M68HC08 (CPU08) |
| Family | HC08LJ / M68HC08 family (CSIC variant) |
| Largeur du bus de données | 8-bit |
| Program Memory Type | FLASH (in-system programmable) |
| Program Memory Size | 24 KB (24K x 8) |
| RAM Size | 768 x 8 (768 bytes) |
| Maximum CPU Frequency | 8 MHz |
| Number of I/O Pins | 48 |
| Boîtier / Format | 80-QFP (14x14 mm) |
| Type de montage | Surface Mount |
| LCD Driver | Yes (integrated segment LCD driver, 4-mux / 8-mux) |
| Communication Interfaces | SCI (UART), SPI |
| Security Bit | Yes (FLASH security/lock) |
| Low-Power Modes | STOP, WAIT |
Configuration des broches de MC908LJ24CFQE
| Broche 1 | VDD — Positive supply |
| Broche 2 | VSS — Ground |
| Broche 3 | OSC1 — Crystal oscillator input / external clock input |
| Broche 4 | OSC2 — Crystal oscillator output |
| Broche 5 | RESET — Reset input (active low) |
| Broche 6 | BKGD/MS — Background debug / mode select |
| Broche 7 | IRQ — External interrupt request |
| Broche 8 | PTA0 — Port A bit 0 (general-purpose I/O, TCLK) |
| Broche 9 | PTA1 — Port A bit 1 (general-purpose I/O, TCH0) |
| Broche 10 | PTA2 — Port A bit 2 (general-purpose I/O) |
| Broche 11 | PTA3 — Port A bit 3 (general-purpose I/O) |
| Broche 12 | PTA4 — Port A bit 4 (general-purpose I/O) |
| Broche 13 | PTA5 — Port A bit 5 (general-purpose I/O, RxD) |
| Broche 14 | PTA6 — Port A bit 6 (general-purpose I/O, TxD) |
| Broche 15 | PTA7 — Port A bit 7 (general-purpose I/O) |
| Broche 16 | VDD — Positive supply (second) |
| Broche 17 | VSS — Ground (second) |
| Broche 18 | PTB0 — Port B bit 0 (general-purpose I/O, SPSD) |
| Broche 19 | PTB1 — Port B bit 1 (general-purpose I/O, SPSCK) |
| Broche 20 | PTB2 — Port B bit 2 (general-purpose I/O, MOSI) |
| Broche 21 | PTB3 — Port B bit 3 (general-purpose I/O, MISO) |
| Broche 22 | PTB4 — Port B bit 4 (general-purpose I/O, SS) |
| Broche 23 | PTB5 — Port B bit 5 (general-purpose I/O) |
| Broche 24 | PTB6 — Port B bit 6 (general-purpose I/O) |
| Broche 25 | PTB7 — Port B bit 7 (general-purpose I/O) |
| Broche 26 | PTC0 — Port C bit 0 (general-purpose I/O) |
| Broche 27 | PTC1 — Port C bit 1 (general-purpose I/O) |
| Broche 28 | PTC2 — Port C bit 2 (general-purpose I/O) |
| Broche 29 | PTC3 — Port C bit 3 (general-purpose I/O) |
| Broche 30 | PTC4 — Port C bit 4 (general-purpose I/O) |
| Broche 31 | PTC5 — Port C bit 5 (general-purpose I/O) |
| Broche 32 | PTC6 — Port C bit 6 (general-purpose I/O) |
| Broche 33 | PTC7 — Port C bit 7 (general-purpose I/O) |
| Broche 34 | PTD0 — Port D bit 0 (LCD segment) |
| Broche 35 | PTD1 — Port D bit 1 (LCD segment) |
| Broche 36 | PTD2 — Port D bit 2 (LCD segment) |
| Broche 37 | PTD3 — Port D bit 3 (LCD segment) |
| Broche 38 | PTD4 — Port D bit 4 (LCD segment) |
| Broche 39 | PTD5 — Port D bit 5 (LCD segment) |
| Broche 40 | PTD6 — Port D bit 6 (LCD segment) |
| Broche 41 | PTD7 — Port D bit 7 (LCD segment) |
| Broche 42 | PTE0 — Port E bit 0 (LCD segment) |
| Broche 43 | PTE1 — Port E bit 1 (LCD segment) |
| Broche 44 | PTE2 — Port E bit 2 (LCD segment) |
| Broche 45 | PTE3 — Port E bit 3 (LCD segment) |
| Broche 46 | PTE4 — Port E bit 4 (LCD segment) |
| Broche 47 | PTE5 — Port E bit 5 (LCD segment) |
| Broche 48 | PTE6 — Port E bit 6 (LCD segment) |
| Broche 49 | PTE7 — Port E bit 7 (LCD segment) |
| Broche 50 | PTF0 — Port F bit 0 (LCD COM/segment) |
| Broche 51 | PTF1 — Port F bit 1 (LCD COM/segment) |
| Broche 52 | PTF2 — Port F bit 2 (LCD COM/segment) |
| Broche 53 | PTF3 — Port F bit 3 (LCD COM/segment) |
| Broche 54 | PTF4 — Port F bit 4 (LCD COM/segment) |
| Broche 55 | PTF5 — Port F bit 5 (LCD COM/segment) |
| Broche 56 | PTF6 — Port F bit 6 (LCD COM/segment) |
| Broche 57 | PTF7 — Port F bit 7 (LCD COM/segment) |
| Broche 58 | PTG0 — Port G bit 0 (additional I/O) |
| Broche 59 | PTG1 — Port G bit 1 (additional I/O) |
| Broche 60 | PTG2 — Port G bit 2 (additional I/O) |
| Broche 61 | PTG3 — Port G bit 3 (additional I/O) |
| Broche 62 | PTG4 — Port G bit 4 (additional I/O) |
| Broche 63 | PTG5 — Port G bit 5 (additional I/O) |
| Broche 64 | PTG6 — Port G bit 6 (additional I/O) |
| Broche 65 | PTG7 — Port G bit 7 (additional I/O) |
| Broche 66 | PTH0 — Port H bit 0 (additional I/O) |
| Broche 67 | PTH1 — Port H bit 1 (additional I/O) |
| Broche 68 | PTH2 — Port H bit 2 (additional I/O) |
| Broche 69 | PTH3 — Port H bit 3 (additional I/O) |
| Broche 70 | PTH4 — Port H bit 4 (additional I/O) |
| Broche 71 | PTH5 — Port H bit 5 (additional I/O) |
| Broche 72 | PTH6 — Port H bit 6 (additional I/O) |
| Broche 73 | PTH7 — Port H bit 7 (additional I/O) |
| Broche 74 | VDD — Positive supply (third) |
| Broche 75 | VSS — Ground (third) |
| Broche 76 | LCD_BP — LCD bias pin |
| Broche 77 | LCD_BPn — LCD bias pin (complementary) |
| Broche 78 | VLCD — LCD supply |
| Broche 79 | PTJ0 — Port J bit 0 (additional I/O) |
| Broche 80 | NC — Not connected (per datasheet) |
Applications typiques
MC908LJ24CFQE convient pour 6 applications: LCD-Driven Home Appliances, Washing Machine and White-Goods Controller, Remote Control and Wireless Sensor Boards, Automotive Body and HVAC Peripherals, Metering and Instrumentation Equipment, Industrial Sensor Interface Boards.
LCD-Driven Home Appliances
The MC908LJ24CFQE integrates an on-chip LCD segment driver capable of 4-mux and 8-mux modes, removing the need for an external LCD controller chip in washing-machine control boards, microwave ovens, and dishwasher user interfaces. Its 48 I/O lines are routed to MCU functions when LCD is enabled, so designers can drive a 4-mux 40-segment display directly from the 80-QFP package with only bias resistors. The 8MHz CPU executes 2-cycle HC08 instructions, giving ~4 MIPS throughput fast enough for capacitive-touch scanning and motor-control interrupt service alongside the LCD refresh. Compared to legacy 4-bit microcontrollers, the 8-bit HC08LJ reduces program-memory pressure and avoids discrete LCD bias-driver chips. Place the part adjacent to the LCD glass tail with short segment traces; bypass each VDD/VSS pair with 100nF and add an LC-reset RC network on the RESET pin per the NXP HC08 reference design.
Recommandé
Washing Machine and White-Goods Controller
The MC908LJ24CFQE targets low-cost white-goods MCU boards where its 24KB FLASH holds the full state-machine, keypad-debounce, motor-pattern lookup tables, and user-interface strings, while 768 bytes of RAM is sufficient for 16-bit wash-cycle counters and small buffer pools. The 8MHz HC08 CPU08 core executes most instructions in 2 bus cycles, allowing reliable servicing of zero-crossing interrupts for triac-based motor and heater control. The on-chip SCI ties directly to a UART-fronted keypad/LED daughter board, and the SPI supports an external EEPROM for cycle-program persistence. With an internal oscillator and integrated LCD driver, the external BOM is limited to a few passives and a triac optocoupler, reducing the controller cost below that of ARM Cortex-M0 designs for the same workload. Watch the internal-oscillator trim across temperature for stable SCI baud rates.
Recommandé
Remote Control and Wireless Sensor Boards
The MC908LJ24CFQE's low-power STOP and WAIT modes make it well-suited to battery-powered remote controls, IR/RF transmitters, and simple wireless sensor nodes. The SCI and SPI host narrow-band RF transceivers or IR-driver front-ends, while the integrated timers capture IR carrier frequencies and the on-board FLASH allows field-upgradeable firmware. The 24KB FLASH supports stack-based protocol libraries like RC5, SIRC, and proprietary sub-GHz packet handlers; 768 bytes of RAM suffices for command queues. Power-consumption design should bias the part from a 3V coin-cell regulator and use WAIT mode between button events with the LCD segments kept active to retain last-displayed state on standby current paths.
Recommandé
Automotive Body and HVAC Peripherals
The MC908LJ24CFQE is positioned for non-safety automotive body applications such as HVAC blend-door actuators, mirror controls, wiper-timer relays, and seat-position memory boards where its 24KB FLASH, 8MHz CPU, and 48 I/O can replace multiple discrete modules. The HC08 CPU08 core's indexed addressing and 16-bit timer are suitable for stepper-motor control loops for HVAC flaps. Engineering samples in the original NXP family indicate automotive temperature-grade coverage for cabin-side use; do not deploy in powertrain or safety-critical systems without AEC-Q100 certification proof. Add TVS protection on bus pins and follow NXP HC08 EMC layout guidelines for CISPR 25 conducted emissions. Recommend migration to S32K1 family for new designs.
Recommandé
Metering and Instrumentation Equipment
The MC908LJ24CFQE can serve as the main controller in single-phase energy meters, water meters, and basic industrial instrumentation, where the on-chip timers capture pulse-counts from sensor front-ends and the FLASH holds the calibration constants and billing tier tables. The 8-bit CPU performs harmonic-distortion calculations, RMS conversions, and tariff look-up tables within the 24KB program space; 768 bytes of RAM covers sample buffers and LCD string buffers. Integration of the LCD driver allows direct drive of the meter's user-display without a separate chip. Use the timer overflow interrupt to wake from WAIT mode for periodic energy-tick computation, lowering standby current; the integrated FLASH security bit provides tamper-resistance for stored calibration data.
Recommandé
Industrial Sensor Interface Boards
The MC908LJ24CFQE works as a low-cost protocol-bridging MCU on industrial sensor-interface boards, where 48 I/O lines accommodate SPI to 4-20 mA loop transmitters, UART to Modbus bridges, and segment-LCD indicator panels. With 24KB FLASH the part can house a full Modbus slave stack with parameter mapping; 768 bytes RAM suffices for holding registers and a small UART ring buffer. The HC08 instruction-set is straightforward to port to and from classic assembly-C modules, easing legacy integration. Add an external TVS and RS-485 transceiver for industrial bus robustness; use optocouplers on the comm lines if isolation is required between field cables and the MCU board.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC908LJ24CFQE — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MCHC908LK24CFQE | MC908LJ24CFUE | MC908AB32CFUE | MC68HC908LJ12CFUE |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 80-QFP (14x14 mm) | 80-QFP (14x14 mm) - same | 80-QFP (14x14 mm) - same | 64-QFP (14x14 mm) | 80-QFP (14x14 mm) - same |
| Program Memory (FLASH) | 24 KB | 24 KB | 24 KB | 32 KB | 12 KB |
| CPU Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| LCD Driver | Yes (integrated, 4-/8-mux) | Yes | Yes | No | Yes |
| Lifecycle Status | Last-Time-Buy (NXP NLM) | Obsolete / NLM | Obsolete / NLM | Obsolete / NLM | Obsolete / NLM |
| Communication | SCI, SPI | SCI, SPI, additional timer/comm | SCI, SPI | SCI, SPI | SCI, SPI |
Principaux différenciateurs
- Integrated LCD driver in 80-QFP (vs MC908AB32CFUE)
- 24KB FLASH with 768 bytes RAM (vs MC68HC908LJ12CFUE)
- Broader peripheral mix within same package (vs MCHC908LK24CFQE)
Notes de conception
Decouple each VDD/VSS pin pair of the 80-QFP MC908LJ24CFQE with a 100nF ceramic capacitor placed within 5mm of the package pin. Add a bulk 10uF tantalum or aluminum polymer capacitor at the regulator output. Use a star-ground layout if analog and digital grounds are not provided internally; the QFP has 3 VDD/VSS pairs that must all be connected to keep digital-noise currents low. Place the crystal (or ceramic resonator) close to OSC1/OSC2 with short symmetrical traces and a guard ground ring for clean clocking at 8MHz.
The HC08 CPU08 core of the MC908LJ24CFQE can enter STOP mode for very-low-current standby (~few microamperes) and WAIT mode for fast wake-up. Connect the RESET pin to VDD through a 10k pull-up and a 1nF-100nF ceramic capacitor to GND to provide a clean power-on reset and allow in-circuit programming via the BKGD/MS pin. Avoid using a watchdog-timer disable jumper, which can prevent proper STOP-mode recovery on some board revisions; consult NXP HC08 errata for the LJ family.
Because the LCD segment pins are multiplexed with general-purpose I/O, route LCD segment traces first and avoid crossing them with SCI/SPI traces. Use a 4-layer PCB with a dedicated ground plane under the 80-QFP pad row; the QFP lead pitch (0.65 mm typical) is wide enough to allow hand rework but tight enough to demand 0.2 mm clearance on the inner layer. For backplane signals BP/BPn, keep traces equal length to preserve duty-cycle symmetry for low-DC-offset LCD drive, and add a series ferrite if the regulator's ripple couples into the LCD waveform.
Do not assert FLASH erase or FLASH program commands without a verified VDD ramp and a stable internal oscillator. The MC908LJ24CFQE is sensitive to VDD droop during FLASH operation, which can lock the part in an unrecoverable state. Avoid hot-plugging the BKGD/MS line during reset; always debounce mechanical reset sources. Set the FLASH security bit only after final firmware validation - once set, the only way to unlock the part is a mass-erase routine performed through BDM, which destroys the calibration data if the part is security-locked at the factory.
Informations de conformité
NXP marks the part as 'No Longer Manufactured' on its product page; full compliance certificates are not published in the verified web data. AEC-Q100 not qualified - do not use in automotive safety applications. Recommend checking with Rochester Electronics or NXP Quality for the latest REACH and RoHS documentation per part-date-code.