W77L516A25PL - 25MHz 8-Bit 8051 MCU, 64KB Flash | Nuvoton
部品番号: W77L516A25PL ✓ 生産中W77L516A25PL 概要
An 8-bit microcontroller is a compact processor intended to control embedded systems rather than execute a desktop operating system. Within the semiconductor hierarchy, the W77L516A25PL belongs to the 8051-compatible microcontroller class and retains the standard 8052 peripheral model, including four 8-bit I/O ports, three 16-bit timer/counters, a full-duplex serial port, and interrupt resources. Its instruction-set compatibility allows legacy 8051-oriented code and development practices to be retained during product modernization.
The principal device characteristics include 64 KB of flash program memory, 1 KB of on-chip RAM, 36 I/O pins, and a 25 MHz operating frequency. Additional integrated resources identified for this device include a serial port, power-on reset, and a watchdog timer. The redesigned core removes wasted clock and memory cycles, so software timing can improve without changing the external clock speed. Flash memory also provides a more flexible program-storage medium than mask-programmed or one-time-programmable microcontroller implementations.
The 44-pin PLCC package provides a leaded, socket-compatible format suited to controllers, interface modules, industrial control boards, and legacy system upgrades. Its pin-compatible 8052 heritage simplifies board-level continuity when a design moves from a conventional 8051-class controller to this faster implementation. Designers should still validate the clock configuration, peripheral allocation, reset behavior, and memory map in the target system rather than assuming every legacy peripheral behaves identically.
Typical uses include industrial equipment interfaces, serial protocol bridges, data acquisition modules, appliance controllers, embedded instrumentation, and communication adapters. The combination of four parallel I/O ports, three timers, serial communications, and 36 I/O lines is especially useful for systems that must connect switches, sensors, displays, relays, and legacy peripherals while maintaining predictable control timing.
The principal design consideration is preserving compatibility at both software and board level. Confirm that the chosen oscillator and reset circuit meet the datasheet requirements, allocate every pin according to the manufacturer's pin description, and include adequate decoupling. Because this is a legacy-compatible 8-bit architecture, migration planning should also include confirmation of compiler support, bootloader behavior, peripheral register mapping, and any source-code changes required for the faster core.
This page combines the manufacturer's device data with practical selection guidance, application context, package information, and verified sourcing links. It is intended to help engineers determine whether the W77L516A25PL fits an existing embedded-control design and how to evaluate compatible W77-family options without overlooking memory, timing, package, or toolchain requirements.
ドロップイン代替品: W77L516A25PL — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
W77L516A2
✅ ドロップイン📋 参考代替品（カタログ未掲載）
W77L516A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
W77L516A25PL
✅ ドロップイン価格はお問い合わせください
データシートを見る →W77L516A25PL 最大定格＆電気的特性
| Microcontroller Type | 8-bit 8051-compatible microcontroller |
| Processor Core | 8052-compatible instruction set |
| 最大クロック周波数 | 25 MHz |
| Program Memory Size | 64 KB (64K x 8) flash |
| RAM Size | 1 KB (1K x 8) |
| Number of I/O Pins | 36 pins |
| Number of 8-Bit I/O Ports | 4 ports |
| Number of 16-Bit Timer/Counters | 3 timers |
| Serial Port | 1 full-duplex serial port |
| Interrupt Sources | Multiple interrupt sources |
| 電源電圧 | 4.5 V |
| パッケージ | 44-pin PLCC |
| Package Lead Style | J-lead |
| 実装タイプ | Through-hole |
| Power-On Reset | Integrated power-on reset |
| Watchdog Timer | Integrated watchdog timer |
| Relative Instruction Performance | Approximately 1.5x to 3x traditional 8051 execution speed |
W77L516A25PL j-lead ピン配置ガイド
W77L516A25PL (j-lead パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: W77L516A25PL.
詳細は データシート をご参照ください。
主な用途
W77L516A25PL の用途: 6 件s: Industrial Equipment Interfaces, Serial Protocol Bridges, Data Acquisition Modules, Appliance Control Boards, Embedded Communication Adapters, Legacy Controller Modernization.
Industrial Equipment Interfaces
The W77L516A25PL fits industrial equipment interfaces that combine multiple digital controls with a serial communication channel. Its 36 I/O lines and four 8-bit I/O ports can connect status indicators, pushbuttons, relays, limit switches, and actuator drivers, while the full-duplex serial port supports a host or service controller. The 25 MHz redesigned core executes typical 8051 instructions approximately 1.5 to 3 times faster than a traditional 8051 at the same clock. This timing advantage is useful for responsive control loops, although legacy delay routines should be recalibrated.
おすすめ
Serial Protocol Bridges
The W77L516A25PL is appropriate for a compact serial bridge or protocol adapter where legacy 8051-compatible code and a PLCC footprint simplify maintenance of installed equipment. Its 25 MHz clock and redesigned core provide more execution margin than a traditional 8051, while three 16-bit timer/counters support baud-rate generation, timeout handling, and periodic service tasks. The 64 KB flash accommodates protocol tables and bridge firmware. Validate framing, interrupt latency, and buffer management because instruction timing can differ from older controllers.
おすすめ
Data Acquisition Modules
The W77L516A25PL can serve as the acquisition controller for a compact module that gathers digital inputs and forwards processed data through a serial interface. Its 36 I/O lines allow connection of sensors, discrete signals, latches, and front-panel controls, while 1 KB of RAM provides working space for samples and status variables. The 25 MHz core improves instruction throughput by approximately 1.5x to 3x relative to a traditional 8051 at the same clock. Design the acquisition sequence around timer interrupts rather than instruction-count delays for repeatable sampling intervals.
おすすめ
Appliance Control Boards
The W77L516A25PL is suitable for appliance and instrumentation controllers that require deterministic I/O, timers, serial diagnostics, and serviceable leaded packaging. Four 8-bit ports and 36 total I/O lines support displays, keys, relays, heaters, motors, and sensors, while the watchdog timer provides a recovery mechanism for stalled control tasks. Its 64 KB flash supports larger control and diagnostic firmware than many basic 8051 devices. Ensure the power supply meets the documented 4.5 V nominal condition and validate reset behavior during mains interruptions.
おすすめ
Embedded Communication Adapters
The W77L516A25PL can act as an embedded communication adapter when a product must preserve an 8051-compatible software base while adding flash storage and faster execution. The full-duplex serial port handles asynchronous communication, and three 16-bit timers support precise bit timing, periodic transmission, and receive timeouts. With 36 I/O lines, the controller can also manage connector-present detection, reset control, status LEDs, and local configuration inputs. Firmware should include framing checks, timeout recovery, and watchdog servicing to maintain reliable adapter operation.
おすすめ
Legacy Controller Modernization
The W77L516A25PL is especially relevant when modernizing an 8051-based controller while retaining a 44-pin PLCC board strategy. The device is 8052 pin-compatible and instruction-set-compatible, and its redesigned core removes wasted clock and memory cycles, delivering approximately 1.5x to 3x faster typical execution than a traditional 8051 at the same clock. This can preserve existing source-code concepts while improving response time. Treat the migration as a controlled engineering change: recompile the firmware, audit peripheral registers, remove timing assumptions, and test startup and brownout recovery.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: W77L516A25PL — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | W77L516A2 | W77L516A | W77L516A25PL |
|---|---|---|---|---|
| Package | 44-pin PLCC (J-lead) | 44-pin PLCC | 44-pin PLCC | 44-LCC (J-lead) |
| Brand | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Nuvoton Technology Corporation | Winbond |
| Processor Class | 8-bit 8051-compatible microcontroller | 8-bit 8051-compatible microcontroller | 8-bit 8051-compatible microcontroller | 8-bit 8051-compatible microcontroller |
| Program Memory | 64 KB flash | 64 KB flash | 64 KB flash | 64 KB flash |
| RAM Size | 1 KB (1K x 8) | 1 KB (1K x 8) | 1 KB (1K x 8) | 1 KB (1K x 8) |
| Number of I/O Pins | 36 pins | 36 pins | 36 pins | 36 pins |
| Timer/Counter Resources | Three 16-bit timer/counters | Three 16-bit timer/counters | Three 16-bit timer/counters | Three 16-bit timer/counters |
| Serial Interface | One full-duplex serial port | One full-duplex serial port | One full-duplex serial port | One full-duplex serial port |
| Power Management Features | Power-on reset and watchdog timer | Power-on reset and watchdog timer | Power-on reset and watchdog timer | Power-on reset and watchdog timer |
主な差別化要因
- Higher execution throughput than a traditional 8051 （vs W77L516A)
- Complete orderable designation with flash and PLCC package （vs W77L516A2)
- Direct source-brand procurement option for the same complete MPN （vs W77L516A25PL)
設計ノート
Do not transplant legacy delay loops without recalculation. The redesigned W77L516A core executes typical 8051 instructions approximately 1.5 to 3 times faster than a traditional 8051 at the same clock, so a loop that previously produced 10 ms may complete much sooner. Convert timing-sensitive routines to hardware-timer intervals whenever practical, then test the shortest and longest operating conditions. Review assembler, compiler, and library code for assumptions about instruction cycles, interrupt latency, and serial timing.
Treat the 44-pin PLCC footprint as a device-specific assignment rather than a generic legacy-controller socket. The manufacturer describes the W77L516A as 8052 pin-compatible, but power, clock, reset, port, timer, serial, and interrupt functions must be checked against the pin-description table. Preserve clearances around the J-leads, avoid placing tall components where the socket or replacement part must be removed, and follow the manufacturer's reference layout for oscillator and decoupling connections.
Design the 5 V-class supply around the device's documented 4.5 V nominal condition and verify the complete operating and absolute-maximum limits in the manufacturer datasheet. Place the required supply capacitors close to the power and ground pins, provide a stable reset path, and account for the transient current produced by switching external loads. The integrated power-on reset does not replace a carefully designed reset network, particularly when motors, relays, or long external wiring can create ground disturbances.
Keep the oscillator path short and isolated from high-current switching nodes. Route serial signals away from relay drivers, inductive loads, and fast-changing power paths, and use a continuous ground reference where practical. Since the PLCC package offers through-hole access, check lead protrusion, soldering cleanliness, and socket retention during assembly. For production maintenance, the leaded package can simplify replacement, but vibration, contamination, and connector retention still require appropriate mechanical safeguards.
コンプライアンス情報
The manufacturer datasheet and product information do not state the requested environmental, halide, or conflict-minerals declarations in the retrieved material. AEC-Q100 is treated as not applicable because the device is an industrial embedded microcontroller rather than an automotive-qualified device.