PIC16F877-20/PQ - 8-Bit 20MHz 14KB MCU 44-QFP | Microchip
MPN: PIC16F877-20/PQ ✓ NakahandaPIC16F877-20/PQ Ulas
A microcontroller is a programmable semiconductor that integrates a processor core, memory, digital I/O, timers, serial interfaces, and optional analog conversion on one device. In the system hierarchy, the PIC16F877 belongs to the 8-bit MCU class, then to PIC16-family Flash microcontrollers. Its broad peripheral set allows one controller to supervise actuators, read sensors, communicate with external circuits, and implement control firmware without separate interface ICs.
Key verified features include 256 bytes of EEPROM data memory, self-programming, eight 10-bit ADC channels, two additional timers, two capture/compare/PWM functions, and a synchronous serial port configurable for 3-wire SPI or 2-wire I²C. The 20 MHz grade provides a 50 ns instruction-cycle basis before considering instruction duration and peripheral clocking. The 33 I/O lines provide substantial board-level connectivity while remaining within the limits of a compact embedded design.
The PIC16F877 architecture combines RISC-like single-word instructions with Flash program memory. Its peripheral partitioning supports protocol handling, timing, pulse-width modulation, and analog measurement without relying on a host processor. The eight-channel 10-bit ADC is useful for monitoring mixed-signal equipment, while EEPROM retains calibration values or configuration data. Self-programming can support applications that need controlled parameter updates after deployment.
Typical uses include industrial controllers, data-acquisition equipment, motor and relay control, instrumentation, communications gateways, and compact embedded products. The 20 MHz rating is appropriate for real-time control loops when the firmware budget and interrupt latency satisfy the application. The 44-pin package requires careful escape routing but provides more I/O and peripheral connectivity than smaller MCU packages.
Designers should use the manufacturer datasheet for the exact pin assignments, electrical limits, timing characteristics, and programming specification. PCB layout must preserve decoupling placement, oscillator stability, analog-reference integrity, and programming access. Because only distributor and manufacturer snippets were supplied here, unverified details remain explicitly marked in the specifications rather than inferred.
Mga alternatibo na pwedeng ilagay na PIC16F877-20/PQ — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok PIC16F877-20/PQ (parehas na form factor at footprint) — pagkakaiba sa Package, ADC, Timers, I/O Pins, Operating Temperature.
PIC16F877-20/I/PQ
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
PIC16F877-20E/PQ
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
PIC16F877-20T/PQ
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
PIC16F877A-20/PQ
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
PIC16F877-20/SS
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
PIC16F877-20/PQ
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →PIC16F877-20/PQ Mga Pinakamataas na Rating at Electrical Characteristics
| Microcontroller Type | 8-bit CMOS Flash microcontroller |
| Maksimum na Taktiko ng Oras | 20 MHz |
| Program Memory | 14 KB Flash |
| Program Memory Organization | 8K x 14 words |
| Data EEPROM | 256 bytes |
| RAM | 368 bytes |
| I/O Pins | 33 |
| ADC Resolution | 10 bits |
| ADC Channels | 8 channels |
| Timers | 3 timers, including 2 additional timers |
| Capture/Compare/PWM Functions | 2 functions |
| Synchronous Serial Port | Configurable as 3-wire SPI or 2-wire I²C |
| Self-Programming | Supported |
| In-Circuit Debug Support | ICD supported |
| Packhaging | 44-MQFP (10 x 10 mm) |
| Uri ng Pagpapasok | Surface mount |
Gabay sa Pin Configuration ng PIC16F877-20/PQ 44-mqfp (10 x 10 mm)
Pin configuration para sa PIC16F877-20/PQ (44-mqfp (10 x 10 mm) package). Kasama sa digital IC na ito ang GPIO, mga communication interface (UART, SPI, I2C), at mga power pin. Sumangguni sa datasheet ng manufacturer para sa mga alternatibong function ng pin at mga opsyon sa configuration. Mahalaga para sa disenyo ng embedded system at PCB layout.
Wala ng detalyadong pinout data na magagamit para sa PIC16F877-20/PQ.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
PIC16F877-20/PQ ay nararapat para sa 6 aplikasyons: Industrial Control Controller, Eight-Channel Data Acquisition, Motor and PWM Control, Instrumentation and Measurement Hub, Communications Gateway, Legacy Embedded Product Upgrade.
Industrial Control Controller
The PIC16F877-20/PQ fits compact machine-control boards because its 20 MHz clock provides useful timing headroom while 33 I/O pins connect discrete sensors, relays, and actuators. The eight 10-bit ADC channels can monitor pressure, temperature, or position inputs without a separate converter, while three timers support event timing and motor or relay control. SPI or I²C provides a path to sensors, displays, and data loggers. Design the 20 MHz implementation around verified timing, isolate noisy industrial wiring, and validate watchdog behavior, reset states, and analog accuracy before production.
Inirekomenda
Eight-Channel Data Acquisition
PIC16F877-20/PQ is appropriate for small multichannel acquisition systems because Microchip verifies eight 10-bit ADC channels, 256 bytes of EEPROM, and 33 I/O pins. Firmware can scan sensors, apply calibration, store settings in EEPROM, and transmit results through SPI or I²C. The 20 MHz clock offers headroom for acquisition sequencing and control calculations, but conversion timing, sample-and-hold behavior, input range, reference accuracy, and noise performance must be read from the official datasheet. Analog grounding and shielding should be separated from switching and relay return currents.
Inirekomenda
Motor and PWM Control
The PIC16F877-20/PQ can serve as the supervisory controller for motors, valves, and lamps because the verified feature set includes two capture/compare/PWM functions and two additional timers. Twenty-MHz operation leaves timing margin for position decoding, pulse generation, fault handling, and serial diagnostics, while the ADC channels can monitor current or position feedback. PWM resolution and motor-drive topology depend on the selected timer and peripheral implementation, which must be confirmed in the datasheet. Keep switching-node currents away from sensitive analog and oscillator paths.
Inirekomenda
Instrumentation and Measurement Hub
PIC16F877-20/PQ is useful as the control hub for laboratory or process instrumentation that must combine digital I/O, timing, ADC measurement, and compact serial communication. Its 14 KB Flash supports moderate protocol and control firmware, while EEPROM can retain calibration constants or setup data. SPI or I²C allows connection to displays, sensors, converters, or storage, and ICD support can assist bring-up. The instrument should define acquisition latency, calibration strategy, fault recovery, and communication protocol before coding because the 368 bytes of RAM constrain multi-buffer data handling.
Inirekomenda
Communications Gateway
PIC16F877-20/PQ can support a small protocol gateway or embedded communications controller because the synchronous serial port supports SPI or I²C, while 33 I/O lines provide multiple chip-select, interrupt, and status signals. The 20 MHz class can process framing and basic protocol tasks, but application-specific UART, CAN, Ethernet, or higher-throughput behavior must be implemented with verified external hardware. A gateway design should budget protocol latency and RAM carefully, provide deterministic buffer management, and test bus isolation, termination, and fault recovery rather than treating the MCU as an automatic network interface.
Inirekomenda
Legacy Embedded Product Upgrade
PIC16F877-20/PQ is a practical fit when maintaining or redesigning an established PIC16F877-based product that needs the 20 MHz grade, 14 KB Flash, and 33 I/O in 44-MQFP. EEPROM supports persistent settings, ADC channels can preserve analog interfaces, and SPI/I²C can retain existing serial peripherals. Because compatibility depends on the original schematic, oscillator circuit, programming toolchain, and firmware assumptions, migration should begin with a pin-by-pin and register-level review. Validate brownout behavior, watchdog settings, startup timing, and production programming before releasing a replacement board.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for PIC16F877-20/PQ — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | PIC16F877-20/I/PQ | PIC16F877-20E/PQ | PIC16F877-20T/PQ | PIC16F877A-20/PQ | PIC16F877-20/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
Pangunahing mga Pagkakaiba
- Higher verified clock rating than the compared 4 MHz PIC16F877 variant (kumpara saPIC16F877-04/PQ)
- Exact distributor availability at the requested 44-MQFP package and speed grade (kumpara saPIC16F877-20/PT)
- Integrated mixed-signal and communications resources (kumpara saMicrochip PIC16F887 migration candidate)
Talaan ng Disenyo
Route the MCU supply from a low-impedance source and place its decoupling network directly at the package power pins. Follow the exact capacitor values, voltage tolerances, and additional analog-supply requirements in the Microchip datasheet; those values were not included in the supplied snippets. Estimated: power dissipation is P = VDD × IDD, so every additional milliamp at 5 V adds 5 mW. Keep switching-regulator and relay supplies physically separated from analog and oscillator return paths.
Design the 44-MQFP footprint from the official Microchip package drawing and verify pin 1, exposed or underside features if present, solder mask, paste, and assembly clearances before fabrication. The verified source confirms a 10 x 10 mm MQFP but does not provide a land pattern. Provide programming-test pads, ground return around noisy pins, and short oscillator traces. A 3D model should not replace cross-checking the released mechanical drawing and assembly notes.
Treat oscillator, RESET, programming, and analog-reference routes as dedicated nets with short paths and stable return references. Keep ADC traces away from relay-coil, motor-switching, clock, and high-di/dt nets; use a quiet ground region where practical. The 20 MHz clock can make small routing errors consequential, so validate edge rates and settling with the actual external load, bus capacitance, firmware, and peripherals rather than relying only on nominal clock frequency.
Do not substitute a lower-speed or different-package suffix solely from a similar family name. The supplied comparison shows PIC16F877-04/PQ runs at 4 MHz, a 75% reduction from the target's 20 MHz, while /PT is associated with a different package in the compared part. Build a replacement checklist covering exact MPN, package drawing, pin names, supply limits, oscillator configuration, memory size, peripheral registers, programming toolchain, bootloader assumptions, and lifecycle commitments.
Impormasyon ng Pagsunod sa Kautusan
No verified compliance declarations were present in the supplied manufacturer and distributor snippets. Compliance values remain unknown rather than inferred. AEC-Q100 applicability also cannot be determined from the provided data.
