W78L801A24DL - 8-bit 8051 24MHz 40-DIP | Winbond
Артикул: W78L801A24DL ✗ Снят с производстваW78L801A24DL Обзор
A microcontroller is a semiconductor device that integrates a CPU core, program memory, data memory, I/O ports, timers, and communication peripherals into one integrated circuit. The W78L801A24DL belongs to the 8-bit MCU family and uses an 8051-compatible instruction set, making it suitable for legacy-compatible control logic, compact instrumentation, appliance interfaces, and small embedded systems. Its mask-programmed ROM is appropriate for high-volume products where firmware is fixed during manufacturing.
The principal device characteristics include 4KB of program memory organized as 4K x 8, 256 x 8 bits of RAM, 32 I/O lines, and operation up to 24MHz. The device is identified in the 40-DIP package, providing through-hole assembly compatibility and straightforward prototyping. The W78L801 family also supports software-selectable idle and power-down operating modes. In idle mode, processor clock operation stops while selected peripheral functions can continue; power-down mode stops the crystal oscillator for lower power consumption.
The W78L801A24DL is appropriate for controllers that need a modest code space and deterministic peripheral handling rather than high-volume flash storage, complex operating systems, or high-speed connectivity. Its 8051-compatible architecture can simplify migration from older 8051 designs. The 24MHz upper speed rating supports faster instruction throughput than many traditional 8-bit designs, although real timing must be checked against the operating voltage and device-specific limits.
Typical implementations include small appliance controllers, sensor-interface modules, industrial control panels, lighting-control boards, simple serial-interface equipment, and legacy peripheral controllers. The 32 available I/O lines provide useful connectivity for buttons, indicators, relays, displays, and external logic, while on-chip timers and communication functions reduce the need for additional support components.
Design with the 40-pin footprint on the PCB and follow the manufacturer pin-description table when assigning signals. Decoupling must be placed close to the supply pins, oscillator components must follow the recommended layout, and unused inputs should be configured to avoid unintended current or state transitions. The fixed mask ROM also means firmware changes normally require a different programming arrangement or a device revision, making definition-time software locking essential.
This page combines the core electrical and packaging characteristics, practical integration guidance, application fit, and replacement constraints. It also distinguishes the W78L801A24DL from merely similar 8051-class devices, because equal package size and clock rating alone do not establish pin-to-pin compatibility.
Аналоги без доработки для W78L801A24DL — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Для этого товара нет аналогов без доработки.
Запросить аналогиW78L801A24DL Максимальные параметры и электрические характеристики
| Product Type | 8-bit 8051-compatible microcontroller |
| Program Memory Size | 4KB (4K x 8) mask ROM |
| RAM Size | 256 x 8 bits |
| Maximum Clock Speed | 24MHz |
| Number of I/O Pins | 32 |
| Корпус | 40-pin DIP |
| Architecture | 8051-compatible 8-bit CISC |
| Program Memory Type | Mask ROM |
| Power-Down Mode | Software selectable |
| Idle Mode | Software selectable; processor clock stops while peripheral operation continues |
| External Clock Operation | Clock can be stopped without affecting processor state |
| Тип монтажа | Through-hole |
Руководство по цоколевке W78L801A24DL в корпусе 40-pin dip
Цоколевка для W78L801A24DL (корпус 40-pin dip). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для W78L801A24DL.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
W78L801A24DL подходит для 6 применениеs: Small Appliance Control, Industrial Sensor Interface, LED Lighting Controller, Legacy Equipment Interface, Simple Serial Controller, Timing and Event Controller.
Small Appliance Control
The W78L801A24DL fits compact appliance-control boards that require fixed firmware, discrete user inputs, and outputs for indicators, relays, or simple actuators. Its 4KB mask ROM is practical for high-volume products whose logic is stable, while 32 I/O lines offer ample connections for buttons, status lamps, and discrete interface signals. The 24MHz rating provides a practical timing margin for responsive state-machine control and periodic scanning. Designers should partition the 256-byte RAM carefully and avoid code or library growth that could exceed the 4KB program space. A production appliance also benefits from the MCU's idle and power-down modes when the main function cycles less frequently than the peripherals require.
Рекомендуется
Industrial Sensor Interface
The W78L801A24DL can serve as the supervisory controller in a small industrial sensor interface where it must read switches or sensors, manage status indicators, and coordinate an upstream serial connection. Its 8051-compatible architecture supports familiar embedded-control patterns, while the 32 available I/O lines allow multiple digital channels to be shared among local inputs and outputs. The 4KB fixed-program footprint suits stable sensing products with limited local processing. Timing-sensitive acquisition should be handled by dedicated peripherals rather than relying solely on polling loops. Firmware must also define fail-safe states for disconnected sensors and invalid inputs before the controller is deployed in an industrial enclosure.
Рекомендуется
LED Lighting Controller
The W78L801A24DL is suitable for a compact LED-lighting controller that sequences channels, drives relays or logic-level transistor stages, and exposes local controls. Its 32 I/O lines provide ample digital fan-out, while the 24MHz-rated 8051 core can execute timing and state-management routines without a high-end processor. The 4KB mask ROM supports cost-effective production of lighting products with fixed behavior and limited configuration logic. PWM generation or precise current regulation should remain in dedicated LED-driver circuitry when the MCU does not provide the required output behavior. The firmware should include default-off states, fault indications, and safe transitions that prevent excessive current during startup.
Рекомендуется
Legacy Equipment Interface
The W78L801A24DL is a logical choice for legacy equipment interfaces because its standard 8051-compatible instruction set can support established control routines, and its 40-pin DIP package is convenient for prototype and repair boards. It can translate switch states, drive indicator outputs, and manage a simple serial connection while preserving familiar firmware architecture. The 256-byte RAM and 4KB mask ROM are adequate only for focused interface logic, not for modern graphical interfaces or comprehensive connectivity. During migration, audit every register, interrupt vector, timer mode, and port behavior against the legacy device. A hardware conversion board can reduce risk when the existing equipment wiring must remain unchanged.
Рекомендуется
Simple Serial Controller
The W78L801A24DL can act as the central controller in a compact serial device that receives commands, validates them, updates outputs, and reports status. Its 8051-compatible core and 24MHz rating fit lightweight command-processing tasks, while 32 I/O lines can support local keys, indicators, and interlock signals. The 4KB program space is adequate for a deliberately limited command set and should not be used for complex protocol stacks. Use a dedicated transceiver when the electrical interface requires noise immunity or longer-distance communication. Firmware should define frame validation, timeout behavior, and safe output states so an incomplete or malformed command cannot leave external equipment in an unsafe condition.
Рекомендуется
Timing and Event Controller
The W78L801A24DL can implement a compact event controller for pulse counting, timed relays, sampling schedules, and small sequencing systems. Its 24MHz operating class provides additional timing headroom over classic low-speed 8051 designs, while the 32 I/O lines support several event inputs and outputs. The MCU's mask ROM favors stable, production-fixed logic where frequent firmware revisions would be costly. Critical timing should be verified across the intended supply-voltage range because execution speed and oscillator behavior can vary with operating conditions. Use latched outputs or external pull resistors where a defined state is required during reset, and design the firmware to prevent false events during power-up, idle periods, and transitions into power-down mode.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для W78L801A24DL — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Ключевые отличия
- Higher clock rating than the compared AT89LP51-20PU (против AT89LP51-20PU)
- Substantially higher clock rating than the compared ATMEGA8515L-8PU (против ATMEGA8515L-8PU)
- Mask-ROM option suited to stable production firmware (против AT89LP51-20PU)
Заметки по проектированию
Use the manufacturer package drawing to create the 40-pin DIP footprint and preserve adequate socket clearance around the device. Place the required bypass capacitor adjacent to the supply and ground pins with a short return path. Do not infer the footprint solely from the 40-pin count: verify the row spacing, pin length, and lead pitch against the physical device before PCB release.
Keep the oscillator circuit close to the controller and route oscillator traces symmetrically and away from switching nodes and high-current relay traces. Confirm the external crystal or clock configuration and load components from the manufacturer datasheet before layout. A mechanically stable crystal socket and nearby ground return are preferable to long oscillator traces on a 24MHz-rated design.
Mask ROM makes the program memory fixed at manufacture. Complete and validate firmware before ordering production quantities, and confirm that the 4KB program limit includes library and startup code. Also avoid assuming that another 40-DIP 8051 controller is interchangeable: compare supply pins, oscillator pins, reset, interrupts, port directions, and all peripheral registers before considering a redesign.
Validate startup, idle, and power-down behavior across the complete intended supply range. The datasheet supports software-selectable idle and power-down modes, but the external clock and peripheral states must be managed consistently. Define safe output levels during reset and brownout conditions so actuators, indicators, and communication lines do not enter an unintended state while the controller is not executing valid firmware.
Информация о соответствии
Compliance attributes are not identified in the indexed product or datasheet excerpts. AEC-Q100 is recorded as unknown rather than not_applicable because no qualification statement was established.