PIC16C77T-20I/L - 8-Bit 20MHz 14KB OTP MCU 44-PLCC | Microchip
MPN： PIC16C77T-20I/L ✓ 啟用中PIC16C77T-20I/L 概覽
An OTP microcontroller is a flash-like non-volatile memory device that can be programmed exactly once after manufacture; unlike UV-erasable EPROM, the windowed CERDIP variant, OTP cannot be erased and re-programmed, which lowers per-unit cost for high-volume production while still providing deterministic in-system program retention. The PIC16C77T-20I/L sits inside the broader PIC16CXX mid-range family (PIC16CXX -> PIC16 mid-range -> 8-bit MCU -> microcontroller -> embedded IC), positioning it as a legacy industrial-grade controller for cost-sensitive embedded designs.
Key features include 33 digital I/O lines, an integrated 8-channel 8-bit A/D converter, and three serial communication peripherals: I2C (Inter-Integrated Circuit, also known as IIC), SPI (Serial Peripheral Interface), and UART/USART (Universal Asynchronous/Synchronous Receiver-Transmitter). Two 8-bit timers and one 16-bit timer/counter support PWM generation and event timing, while 256 bytes of EEPROM data memory retain configuration and calibration values across power cycles. The device runs from a 4.0 V to 5.5 V single supply and is specified across the -40C to +85C industrial temperature range (I suffix).
Architecturally, the PIC16C77T-20I/L uses a Harvard architecture with separate program and data buses, a single accumulator (W register) working model, and a 14-bit instruction word optimized for compact code density. Its 20 MHz oscillator delivers a 200 ns instruction cycle, and the integrated A/D converter uses successive-approximation conversion with analog input multiplexing across eight channels, suitable for slow-changing sensor signals.
Typical applications include industrial process control, motor drive interface logic, instrumentation data acquisition, automotive body electronics (non-safety), HVAC control boards, and consumer appliance controllers. Its combination of OTP memory, broad peripheral set, and industrial temperature range makes it well-suited for high-volume embedded products where code stability is required over the product lifecycle.
A primary design consideration with this device is the OTP memory - firmware must be fully verified before programming, because no field re-programmability is possible. Engineers targeting in-field firmware updates should select a Flash-based PIC16F7X equivalent (such as PIC16F877A-I/L) with the same 44-pin PLCC footprint.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical engineering guidance not consolidated on any single distributor or manufacturer page, providing a one-stop engineering reference for the PIC16C77T-20I/L.
直接替換替代品，適用於 PIC16C77T-20I/L — 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： PIC16C77T-20I/L （相同外形與佔位） — 差異在於 Core Architecture, Program Memory Type, Timers, ADC, Operating Temperature.
PIC16C77T-20/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16C77-20I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16C77T-04E/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16C77T-10/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16C77T-10E/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16C77-04I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16C77T-20I/L 最大額定值與電氣特性
| Core Architecture | 8-bit PIC16C mid-range, Harvard |
| Instruction Set | RISC, 35 instructions, 14-bit word |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 14 KB (8K x 14) |
| RAM | 368 bytes |
| EEPROM Data Memory | 256 bytes |
| 最大時脈頻率 | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Supply Voltage (Vdd) | 4.0 V to 5.5 V |
| I/O Pins | 33 digital I/O |
| A/D Converter | 8 channels, 8-bit resolution |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Communication Interfaces | I2C, SPI, UART/USART |
| 封裝 | 44-pin PLCC (16.59 x 16.59 mm) |
| 工作溫度 | -40C to +85C (Industrial, I suffix) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
PIC16C77T-20I/L 44-pin plcc (16.59 x 16.59 mm) 腳位配置指南
PIC16C77T-20I/L（44-pin plcc (16.59 x 16.59 mm) 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： PIC16C77T-20I/L.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC16C77T-20I/L 適用於 6 應用s: Industrial Process Control, Motor Drive Interface Logic, Instrumentation Data Acquisition, Automotive Body Electronics (Non-Safety), HVAC Control Boards, Consumer Appliance Controllers.
Industrial Process Control
The PIC16C77T-20I/L fits industrial process control boards because of its 8-channel 8-bit A/D converter, 33 digital I/O pins, and 20 MHz CPU clock at -40C to +85C. The A/D reads thermocouple, pressure transducer, and 4-20 mA loop signals with multiplexing across 8 channels; the 14 KB OTP EPROM holds the deterministic PID control loop and HMI menu code. The UART/USART links to operator panels and SCADA, while SPI connects to digital potentiometers for trim. Industrial temp and surface-mount PLCC make it suited to factory-floor controllers, conveyor sorters, and tank-level monitors where OTP cost-down and 5 V supply rails are industry-standard.
推薦
Motor Drive Interface Logic
For motor-drive interface logic on stepper and small BLDC controllers, the PIC16C77T-20I/L's three timers (2x 8-bit + 1x 16-bit with capture/compare) generate the PWM commutation and pulse-count feedback, while the 33 I/O pins drive H-bridge enable lines and Hall-sensor inputs. The 20 MHz instruction cycle executes 5 MIPS, sufficient to handle 20 kHz PWM switching plus the UART command interface for speed setpoint commands. The 256-byte EEPROM stores motor calibration parameters across power cycles. The 5 V supply aligns with industrial driver ICs, and the 44-PLCC footprint fits the legacy form factor used in many motor-control modules.
推薦
Instrumentation Data Acquisition
In instrumentation data acquisition, the PIC16C77T-20I/L's 8-channel 8-bit A/D converter digitizes analog sensor channels at up to ~20 kS/s aggregate, while 368 bytes of RAM buffer conversion results and 14 KB of OTP code runs the averaging, scaling, and display logic. The I2C peripheral reads external EEPROM calibration tables; the SPI bus drives an LCD controller or digital potentiometer; and the UART streams formatted readings to a host PC. The industrial -40C to +85C range suits bench-top and rack-mounted instruments in lab and factory environments. OTP ensures code stability for calibrated products that must not drift over the instrument lifecycle.
推薦
Automotive Body Electronics (Non-Safety)
For non-safety automotive body electronics - window lifts, mirror controls, lighting drivers - the PIC16C77T-20I/L provides the I/O count, 5 V operation, and -40C to +85C industrial temperature range that match cabin-electronics environments. Its 33 digital I/O pins drive relays and read switch matrix inputs; the A/D reads potentiometer positions for seat adjustment; the UART links to body-control modules; and the I2C bus reads digital temperature sensors. OTP EPROM is acceptable for high-volume body modules with finalized firmware, and the 44-PLCC package supports through-hole-style wave soldering on legacy automotive PCB assemblies.
推薦
HVAC Control Boards
HVAC control boards leverage the PIC16C77T-20I/L's 8-channel A/D for thermistor temperature sensing, its timers for triac zero-crossing phase-angle dimming of fan speeds, and its 33 I/O pins for relay coils driving compressors and dampers. The I2C peripheral reads digital humidity sensors, while the UART connects to wall thermostats and building management gateways. Industrial -40C to +85C operation covers equipment-room and rooftop-unit environments, and 5 V supply aligns with HVAC driver rails. The OTP EPROM delivers BOM-cost reduction for high-volume residential HVAC controls where firmware is finalized at production release.
推薦
Consumer Appliance Controllers
Consumer appliance controllers (washing machines, dishwashers, microwave ovens, small kitchen appliances) rely on the PIC16C77T-20I/L's I/O count for keypad scanning, seven-segment or LCD display driving, and motor/valve actuation. The A/D reads water-level, temperature, and humidity sensors, while the timers generate buzzer tones and PWM for variable-speed drives. The UART/USART links to diagnostic ports for service. The 14 KB OTP EPROM holds the deterministic state machine for cycle control - acceptable for closed appliance designs - and the 44-PLCC through-hole-compatible footprint suits high-volume wave-soldered appliance PCBs where per-unit cost matters most.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C77T-20I/L — 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 | PIC16C77T-20/L | PIC16C77-20I/L | PIC16C77T-04E/L | PIC16C77T-10/L | PIC16C77T-10E/L | PIC16C77-04I/L |
|---|---|---|---|---|---|---|---|
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 10 MHz | 10 MHz | 4 MHz |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| A/D Converter | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit |
| Packaging Format | Tape & Reel (T suffix) | Tube | Tube | Tape & Reel | Tube | Tape & Reel | Tube |
主要差異化特點
- Tape-and-reel packaging for high-volume SMT assembly (對比PIC16C77T-20/L)
- 20 MHz maximum clock - highest speed in the family (對比PIC16C77T-04E/L)
- Industrial -40C to +85C temperature range (對比PIC16C77T-10/L)
- PIC16C7X family with mature toolchain and reference designs (對比PIC16F877A-I/L)
設計說明
The OTP (One-Time Programmable) EPROM cannot be erased after programming. Verify firmware with the PIC16C77 windowed CERDIP variant (PIC16C77-20/JW) before committing to the OTP part for production. A single bit error in production programming requires scrapping the device; plan for pre-production programming validation.
The PIC16C77T-20I/L requires a stable 4.0 V to 5.5 V supply with decoupling: place a 100 nF ceramic capacitor directly across VDD/VSS pins adjacent to the IC, plus a 10 uF bulk capacitor on the board-level 5 V rail. Brown-out detection is configurable via configuration fuses - enable it for industrial applications to prevent code execution at unsafe supply voltages below 4.0 V.
Place the 20 MHz crystal or resonator within 10 mm of the OSC1/OSC2 pins to minimize parasitic capacitance and ensure stable oscillation. Keep digital switching traces (especially PWM outputs and clock signals) away from the analog AVdd/A Vss pins and the A/D converter input traces. Use a ground plane under the device with a single-point connection between digital and analog ground returns near the AVDD pin.
For in-circuit serial programming (ICSP), allocate the RB6 (PGC) and RB7 (PGD) pins to dedicated test points or a 2x3 header rather than shared signal lines. The MCLR pin requires a 10 kohm pull-up to VDD for normal operation, plus a diode and current-limiting resistor for the in-circuit programming voltage. Sharing MCLR with a reset supervisor IC is possible but requires careful RC timing to avoid contention.
合規資訊
RoHS, REACH, lead-free, and halogen-free status not stated in the Verified Web Data; marked [DATA_NEEDED] in specs. AEC-Q100 not qualified - this is an industrial-temp (I suffix) part, not automotive-grade.
