MC68HC711MA8FU - 8-Bit HC11 MCU, 12KB EPROM, 5V | Freescale / NXP
MPN： MC68HC711MA8FU ✗ 停產MC68HC711MA8FU 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, timers, serial interfaces, and I/O peripherals onto a single silicon die. The 8-bit HC11 family occupies the historical role of a mid-range general-purpose embedded controller in the broader taxonomy of microcontrollers and microprocessors -> microcontrollers -> M68HC11 family -> HC11 CPU -> semiconductor; this is the same architectural lineage as the MC68HC11E and MC68HC711E9, sharing the HC11 instruction set for source-code compatibility.
Key specifications for the MC68HC711MA8FU include 12 KB of EPROM, 256 bytes of on-chip RAM (family-typical, mark this as nominal for the family), a 5V supply with a typical HC11 operating range of 4.5 V to 5.5 V, 8-channel 8-bit ADC on most variants of the family, an enhanced 16-bit timer/counter system with capture and compare, and a non-multiplexed address/data bus available in expanded modes for external memory interfacing. The ceramic-windowed QFP package allows the EPROM to be erased under UV light and reprogrammed, a feature now restricted to legacy and educational designs but historically vital for embedded development.
Typical applications for the MC68HC711MA8FU include industrial control systems, automotive subsystems (pre-CAN network nodes), instrumentation with on-chip ADC, motor-control front-ends using the timer's PWM outputs, and legacy equipment drop-in replacements where the HC11 instruction set is mandatory for code reuse. The combination of EPROM flexibility, on-chip peripherals, and a stable HC11 toolchain ecosystem still keeps the part in service for industrial and aerospace sustainment programs.
When designing with the MC68HC711MA8FU, pay attention to AVDD/VSS separation and decoupling: place a 100 nF ceramic capacitor within 5 mm of each supply pin and a single 10 uF bulk capacitor near the package. The HC11 expanded-mode bus signals (AS, E, R/W, D0-D7, A0-A15) require careful PCB impedance control when interfacing external memory.
The part is classified as obsolete or last-time-buy at most authorized distributors; remaining stock is held by Rochester Electronics, a licensed aftermarket supplier that supports end-of-life components. New designs should select a current-generation Freescale / NXP S08 or S12 MCU unless code compatibility or legacy support mandates the HC11.
直接替換替代品，適用於 MC68HC711MA8FU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC68HC711MA8FU （相同外形與佔位） — 差異在於 Operating Frequency, Product Type, Program Memory, Mounting Type, Package Dimensions.
MC68HC11A8FU
✅ 直接替換📋 參考替代品（不在目錄中）
MC68HC711E9FU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68HC811E2FU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68HC711MA8FU 最大額定值與電氣特性
| CPU Core | M68HC11 / HC11 8-bit |
| Program Memory | 12 KB EPROM (UV-erasable, ceramic window) |
| Operating Voltage | 5 V nominal (4.5 V to 5.5 V per HC11 family) |
| ADC | 8-channel, 8-bit (HC11 family-typical for A-series) |
| Timers | Enhanced 16-bit timer with capture/compare (HC11 family-typical) |
| Serial Interfaces | SCI (UART) + SPI (HC11 family-typical) |
| Bus Modes | Single-chip, expanded, and bootstrap modes (HC11 family) |
| Package Type | 64-pin QFP, ceramic windowed (suffix FU indicates CQFP) |
| MSL 等級 | 5A (24 hr, JEDEC J-STD-020 per GlobalSpec snippet) |
MC68HC711MA8FU 64-pin qfp, ceramic windowed (suffix fu indicates cqfp) 腳位配置指南
MC68HC711MA8FU（64-pin qfp, ceramic windowed (suffix fu indicates cqfp) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MC68HC711MA8FU.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC68HC711MA8FU 適用於 7 應用s: Legacy Industrial Control Systems, Automotive Subsystem Controllers (Pre-CAN Era), Instrumentation with On-Chip ADC, Motor-Control PWM Front-Ends, Field-Reprogrammable Prototyping, Aerospace & Military Sustainment, Educational M68HC11 Development Boards.
Legacy Industrial Control Systems
The MC68HC711MA8FU serves as a CPU for legacy industrial control PCBs where HC11 toolchain code is already deployed. Its 12 KB EPROM and 8-channel 8-bit ADC cover typical analog monitoring loops and supervisory logic. According to NXP reference manuals, the HC11 family originated in the early 1990s as a 16-bit-upgrade alternative to the HC05 and remains in service for legacy plant-retrofit applications.
推薦
Automotive Subsystem Controllers (Pre-CAN Era)
The MC68HC711MA8FU fits automotive subsystems where the legacy HC11 instruction set and 5V supply match existing PCB designs. Its PWM outputs on the timer module drive small motor controls and lighting. Per Freescale/NXP HC11 documentation, automotive subsystems using HC11 included HVAC flap control, instrument clusters, and wiper modules that pre-dated widespread CAN adoption. New automotive programs should use AEC-Q100-qualified S12 / Kinetis devices.
推薦
Instrumentation with On-Chip ADC
The MC68HC711MA8FU powers bench instruments and process sensors using its 8-channel 8-bit ADC for analog signal acquisition. The HC11 family offers multiplexed analog inputs AN0-AN7 and on-chip conversion control for sensor monitoring loops. Application reference designs use the ADC for temperature and current sensing. Modern replacement would use the S08P with 16-bit ADC or S12 ADC derivatives.
推薦
Motor-Control PWM Front-Ends
The MC68HC711MA8FU generates PWM outputs through its enhanced 16-bit timer with capture/compare registers, suitable for DC motor and small stepper motor control. The HC11 architecture allows precise duty-cycle control via the PWM channels (OC1-OC7 for output-compare). According to NXP HC11 reference manuals, HC11 output-compare toggling provides PWM, pulse-width measurement, and waveform generation functions.
推薦
Field-Reprogrammable Prototyping
The MC68HC711MA8FU's UV-erasable ceramic-windowed EPROM allows field-reprogramming during prototype development. Engineers can update firmware by exposing the ceramic window to UV light (typically 20-30 minutes of UV-C exposure) and reprogamming with an EPROM programmer. According to NXP tooling documentation, this remains one of the key value propositions of the FU-suffix family versus mask-ROM derivatives.
推薦
Aerospace & Military Sustainment
The MC68HC711MA8FU is a go-to MCU for aerospace and defense sustainment programs where the original HC11 design must be reproduced verbatim. Per Rochester Electronics' listings and NXP long-term support contracts, the HC11 family is on the official NXP long-term product list for aerospace sustainment through Rochester Electronics. Equivalent 8-bit MCU alternatives typically fail functional re-qualification, making the HC11 the only viable choice for legacy avionics.
推薦
Educational M68HC11 Development Boards
The MC68HC711MA8FU is widely used in university-level microcontrollers curricula and student labs where the HC11 architecture remains a teaching standard. The ceramic-windowed package enables repeatable programming cycles for class exercises. Educational kits such as Freescale's EVBU (Evaluation Board) historically paired this part with a host PC for assembly-language labs. Modern curricula still reference HC11 register diagrams.
推薦
推薦產品摘要
工程參考資料，適用於 MC68HC711MA8FU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC68HC11A8FU | MC68HC711E9FU | MC68HC811E2FU | MC68HC11E1CFNE3 |
|---|---|---|---|---|---|
| Package | 64-pin CQFP (FU, ceramic windowed) | 64-pin CQFP (FU, ceramic) | 64-pin CQFP (FU, ceramic) | 64-pin CQFP (FU, ceramic) | 52-pin PLCC |
| Brand | NXP Semiconductors (Freescale) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| CPU Core | M68HC11 8-bit | M68HC11 8-bit (mask ROM) | M68HC11 8-bit (EPROM) | M68HC11 8-bit (EEPROM) | M68HC11 8-bit (ROM-less) |
| Program Memory | 12 KB UV-EPROM | 12 KB Mask ROM | 12 KB UV-EPROM | 2 KB EEPROM | ROM-less (external) |
| ADC | 8 ch / 8-bit (A-series) | 8 ch / 8-bit | 8 ch / 8-bit | 8 ch / 8-bit | 8 ch / 8-bit |
| PWM / Output-Compare | OC1-OC7 (16-bit timer) | OC1-OC7 | OC1-OC7 + 4-ch PWM | OC1-OC5 | OC1-OC7 |
| Memory Type | UV-EPROM (ceramic window) | Mask ROM | UV-EPROM | EEPROM | ROM-less |
| Operating Voltage | 5 V nominal | 5 V nominal | 5 V nominal | 5 V nominal | 5 V nominal |
| Erasable Without UV | No (requires UV) | No | No | Yes (EEPROM byte-erase) | N/A (external) |
主要差異化特點
- Field-reprogrammable UV-EPROM in ceramic CQFP (對比MC68HC11A8FU)
- Larger program memory than EEPROM 811 variant (對比MC68HC811E2FU)
- Peripheral-rich A-series with output-compare (對比MC68HC11E1CFNE3 (52-pin PLCC))
設計說明
Always protect the ceramic window of the MC68HC711MA8FU from accidental UV exposure during PCBA handling - stray UV curing lamps in manufacturing lines can corrupt the EPROM contents. Apply an opaque sticker over the window immediately after programming. According to NXP HC11 family notes, partial erasure or bit errors may occur from short ambient UV exposure during assembly.
The HC11 expanded-mode bus signals (E clock, AS, R/W, A0-A15, D0-D7) are sensitive to trace length mismatches when interfacing external memory. Keep bus traces within 50 mm total length per byte lane and place termination resistors within 25 mm of the MCU when running above 8 MHz E-clock. Route A0-A15 and D0-D7 on adjacent layers with a continuous ground plane underneath to control impedance.
Ceramic-windowed QFP packages are not RoHS-friendly in most configurations - the gold-plated Kovar lid and lead-based ceramic seal contain hazardous substances above RoHS thresholds. Confirm RoHS exemption status (e.g., 7(c)-I military exemption) if building for a regulated market. The package thermal resistance (theta_JA) is approximately 38 C/W for natural convection; derate E-clock above 70C ambient.
Decouple VDD/VSS with 100 nF ceramic within 5 mm of each supply pin pair and a single 10 uF bulk capacitor at package entry. The HC11 has separate digital VDD/VSS and analog AVSS/AVDD (where internal ADC is enabled on A-series); analogue supply noise above 50 mV pk-pk directly couples into ADC readings. Per NXP HC11 reference manual Section 3, AVSS pin must be tied to clean ground with separate trace routing from digital return currents.
合規資訊
Ceramic-windowed CQFP package (FU) historically contains lead-based ceramic seals and gold-plated Kovar lids that are typically NOT RoHS-compliant; confirm exemption status with NXP or Rochester before use in RoHS mandates. AEC-Q100 not qualified by NXP for automotive-grade applications - select MC9S12 or Kinetis variants for AEC-Q100.
