PIC16F74T-I/ML - 8-bit 20MHz 7KB Flash MCU | Microchip
MPN: PIC16F74T-I/ML ✓ Hoạt độngPIC16F74T-I/ML Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, peripheral set, and I/O ports. The PIC16F74 belongs to Microchip's mid-range PIC16 family, a 14-bit instruction-set architecture positioned between the baseline PIC10/12/16F5x family and the enhanced PIC18 family in cost, performance, and peripheral richness. PIC16 mid-range devices are widely used in industrial control, consumer appliances, and automotive body modules because of their deterministic instruction timing, low power consumption, and upward code compatibility from earlier PIC families.
Key features include 8 channels of 8-bit A/D conversion with 2 additional input channels, a synchronous serial port (SSP) supporting SPI and I2C, a USART with 9-bit address masking, two 8-bit timers plus one 16-bit timer, a watchdog timer with on-chip RC oscillator, and in-circuit serial programming (ICSP) capability. The wide operating voltage range of 4.0 V to 5.5 V and industrial temperature range of -40 °C to +85 °C make the PIC16F74 suitable for harsh environments.
Typical applications span industrial control panels, sensor interface modules, motor-drive supervisory logic, HVAC controllers, security and alarm systems, and consumer white goods. The 33 I/O pins and flexible peripheral mix allow the device to act as a system supervisor coordinating analog sensors, keypad input, LCD drive, and serial communication to a host controller.
Designers should note that the PIC16F73 and PIC16F74 differ only in pin count and I/O count; the PIC16F76/77 add 8 more I/O and more A/D channels. The /ML exposed-pad variant requires thermal pad soldering to the PCB for proper electrical grounding and thermal dissipation.
Bộ thay thế dễ dàng lắp đặt cho PIC16F74T-I/ML — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16F74T-I/ML (cùng hình factor và footprint) — khác nhau ở Package, Serial Interfaces, Timers, Operating Temperature, Program Memory Size.
PIC16F74T-E/ML
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Xem tài liệu →PIC16F74-I/ML
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Xem tài liệu →PIC16F74-E/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F77-I/ML
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F747-I/ML
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Xem tài liệu →PIC16F74T-I/ML Tỷ lệ tối đa & tính chất điện
| Product Type | 8-bit Microcontroller (MCU) |
| Family | PIC16F (Mid-Range 14-bit core) |
| Program Memory Size | 7 KB (4K x 14 words) FLASH |
| RAM Size | 192 x 8 bytes |
| Maximum CPU Speed | 20 MHz |
| Instruction Execution Time | 200 ns (at 20 MHz) |
| Number of I/O Pins | 33 |
| A/D Converter | 8 channels, 8-bit (with 2 additional inputs) |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Serial Interfaces | SSP (SPI / I2C), USART (with 9-bit) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| In-Circuit Programming | ICSP |
| Operating Voltage | 4.0 V to 5.5 V |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial, I grade) |
| Hộp | 44-pin QFN Exposed Pad (44-VQFN EP, ML suffix) |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR, /ML suffix) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16F74T-I/ML
| Chân 1 | RA0/AN0 — Digital I/O / Analog input channel 0 |
| Chân 2 | RA1/AN1 — Digital I/O / Analog input channel 1 |
| Chân 3 | RA2/AN2 — Digital I/O / Analog input channel 2 |
| Chân 4 | RA3/AN3/VREF — Digital I/O / Analog input 3 / ADC reference |
| Chân 5 | RA4/T0CKI — Digital I/O / Timer 0 clock input |
| Chân 6 | RA5/AN4/SS — Digital I/O / Analog input 4 / SPI slave select |
| Chân 7 | RE0/RD/AN5 — Digital I/O / Parallel slave port read / Analog input 5 |
| Chân 8 | RE1/WR/AN6 — Digital I/O / Parallel slave port write / Analog input 6 |
| Chân 9 | RE2/CS/AN7 — Digital I/O / Parallel slave port chip select / Analog input 7 |
| Chân 10 | VDD — Positive supply voltage |
| Chân 11 | VSS — Ground |
| Chân 12 | OSC1/CLKIN — Crystal/Resonator or external clock input |
| Chân 13 | OSC2/CLKOUT — Crystal/Resonator or clock output |
| Chân 14 | RC0/T1OSO/T1CKI — Digital I/O / Timer1 oscillator output / Timer1 clock input |
| Chân 15 | RC1/T1OSI/CCP2 — Digital I/O / Timer1 oscillator input / CCP2 |
| Chân 16 | RC2/CCP1 — Digital I/O / CCP1 (PWM) |
| Chân 17 | RC3/SCK/SCL — Digital I/O / SPI clock / I2C clock |
| Chân 18 | RD0 — Digital I/O / Parallel slave port data bit 0 |
| Chân 19 | RD1 — Digital I/O / Parallel slave port data bit 1 |
| Chân 20 | RD2 — Digital I/O / Parallel slave port data bit 2 |
| Chân 21 | RD3 — Digital I/O / Parallel slave port data bit 3 |
| Chân 22 | RD4 — Digital I/O / Parallel slave port data bit 4 |
| Chân 23 | RD5 — Digital I/O / Parallel slave port data bit 5 |
| Chân 24 | RD6 — Digital I/O / Parallel slave port data bit 6 |
| Chân 25 | RD7 — Digital I/O / Parallel slave port data bit 7 |
| Chân 26 | VSS — Ground |
| Chân 27 | VDD — Positive supply voltage |
| Chân 28 | RB0/INT — Digital I/O / External interrupt |
| Chân 29 | RB1 — Digital I/O |
| Chân 30 | RB2 — Digital I/O |
| Chân 31 | RB3 — Digital I/O |
| Chân 32 | RB4 — Digital I/O |
| Chân 33 | RB5 — Digital I/O |
| Chân 34 | RB6/PGC — Digital I/O / ICSP clock |
| Chân 35 | RB7/PGD — Digital I/O / ICSP data |
| Chân 36 | RC4/SDI/SDA — Digital I/O / SPI data in / I2C data |
| Chân 37 | RC5/SDO — Digital I/O / SPI data out |
| Chân 38 | RC6/TX/CK — Digital I/O / USART transmit / clock |
| Chân 39 | RC7/RX/DT — Digital I/O / USART receive / data |
| Chân 40 | MCLR/VPP — Master clear reset / ICSP programming voltage |
| Chân 41 | AVDD — Analog positive supply voltage |
| Chân 42 | AVSS — Analog ground |
| Chân 43 | NC — Not connected (per datasheet QFN pinout) |
| Chân 44 | EP — Exposed thermal pad - tie to VSS for thermal/grounding |
Ứng dụng tiêu biểu
PIC16F74T-I/ML phù hợp cho 6 Áp dụngs: Industrial Control Panels, Sensor Interface Modules, Appliance Control Boards, Security and Alarm Systems, HVAC Controllers, Motor-Drive Supervisory Logic.
Industrial Control Panels
The PIC16F74T-I/ML fits industrial control panel designs because it combines 33 digital I/O, an 8-channel 8-bit ADC, and SPI/I2C/USART serial interfaces in a compact 44-VQFN EP package. Its 4.0-5.5 V supply and -40 to +85 C industrial range let it sit alongside 24 V-signal conditioning circuitry. The exposed thermal pad reduces junction temperature in enclosed cabinets where airflow is limited. The PIC16F74's deterministic 200 ns instruction timing simplifies the timing analysis required for safety-relevant logic in panel controllers.
Được đề xuất
Sensor Interface Modules
For multi-sensor analog front-end modules, the PIC16F74T-I/ML delivers 8 ADC channels with two additional analog inputs, ample for temperature, pressure, and flow transducers after signal conditioning. The 192-byte SRAM is sufficient for averaging and threshold logic on each channel, and the USART enables digital transmission to a host PLC. The 5 V supply is ideal for legacy 5 V sensor ecosystems, and the ICSP interface allows field firmware updates. The exposed pad QFN package keeps the footprint below 9 mm x 9 mm, allowing dense sensor-node PCBs.
Được đề xuất
Appliance Control Boards
White-goods appliance controllers (washers, dishwashers, ovens) benefit from the PIC16F74T-I/ML's 33 I/O for keypad, LED, and relay drive, plus its PWM-friendly CCP module for motor speed or heating-element control. The 20 MHz CPU with hardware multiplier support handles UI state machines and safety interlocks deterministically. The wide 4.0-5.5 V supply tolerates rectified 5 V rails common in appliance SMPS designs, and the industrial temperature rating covers under-cabinet thermal rise.
Được đề xuất
Security and Alarm Systems
The PIC16F74T-I/ML is well suited to alarm-panel logic: 33 I/O can scan multiple PIR, door, and glass-break zones, the USART with 9-bit addressing talks to a keypad or GSM module, and the SSP port in I2C mode connects to EEPROM for event logging. Its low power-down current supports battery-backed operation, and the watchdog timer with on-chip RC oscillator provides robust recovery from brownouts. The 44-QFN EP package enables slim panel enclosures.
Được đề xuất
HVAC Controllers
In heating, ventilation, and air-conditioning controllers the PIC16F74T-I/ML coordinates temperature sensors (via the 8-channel ADC), drives triac-controlled fans through optoisolators, and displays status on character LCDs through parallel I/O. The 16-bit timer delivers accurate PWM for variable-speed blower control, and the synchronous serial port interfaces to wireless or wired thermostats. Industrial temperature rating and 5 V tolerance fit rooftop unit electronics with wide thermal swings.
Được đề xuất
Motor-Drive Supervisory Logic
As a supervisory MCU in brushed-DC or stepper motor drives, the PIC16F74T-I/ML reads feedback from Hall sensors or incremental encoders, monitors current shunt amplifiers, and asserts enable/FAULT lines to gate drivers. Its 33 I/O accommodate fault multiplexing, brake control, and host-side CAN or RS-485 communication. The 200 ns instruction execution supports fast over-current reaction times, and the exposed thermal pad keeps the supervisor cool when mounted near power-stage heat sinks.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F74T-I/ML — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16F74T-E/ML | PIC16F74-I/ML | PIC16F74-E/ML | PIC16F77-I/ML | PIC16F747-I/ML |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN EP (ML) | 44-VQFN EP (ML) - same | 44-VQFN EP (ML) - same | 44-VQFN EP (ML) - same | 44-VQFN EP (ML) - same | 44-VQFN EP (ML) - same |
| Program Memory | 7 KB FLASH | 7 KB FLASH | 7 KB FLASH | 7 KB FLASH | 14 KB FLASH | 7 KB FLASH |
| RAM | 192 B | 192 B | 192 B | 192 B | 368 B | 192 B |
| I/O Pins | 33 | 33 | 33 | 33 | 40 | 33 |
| ADC | 8-ch 8-bit | 8-ch 8-bit | 8-ch 8-bit | 8-ch 8-bit | 8-ch 8-bit | 8-ch 8-bit |
| CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40 C to +85 C (I) | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +125 C (E) | -40 C to +85 C (I) | -40 C to +85 C (I) |
| Packaging | Tape & Reel | Tape & Reel | Tube | Tube | Tube | Tube |
Bảo phân biệt quan trọng
- Tape-and-reel packaging optimized for high-volume SMT assembly (vsPIC16F74-I/ML)
- Industrial temperature grade coverage without extended-range cost (vsPIC16F74T-E/ML)
- 8-channel 8-bit ADC with two additional analog inputs (vsPIC16F73-I/SO)
Ghi chú thiết kế
The 44-VQFN EP package exposes a large thermal pad (pin 44) that MUST be soldered to the PCB ground pour for proper heat sinking and electrical grounding. Estimated: with a 4-layer 1-oz copper 44-QFN land pattern, theta_JA is roughly 28 C/W; at 25 mA active and 5 V the device dissipates ~125 mW, yielding a 3.5 C rise - well within the 125 C junction limit, but enclosed industrial enclosures should still verify with thermocouple measurement.
Place a 0.1 uF decoupling capacitor within 3 mm of each VDD/VSS pair (pins 10-11 and 26-27) and a 10 uF bulk capacitor near the MCLR/VPP pin. The AVDD/AVSS pins (41/42) require a dedicated 0.1 uF + 10 uF filter for ADC noise rejection. Keep the crystal traces to OSC1/OSC2 short and surround them with a ground guard ring to avoid injection of switching noise into the 20 MHz oscillator.
Do not leave MCLR floating - it must be pulled high through a 10 kohm resistor to VDD for normal operation, or driven high by the ICSP programmer. Brown-out reset (BOR) should be enabled in the configuration word for industrial designs to recover from supply dips below 4.0 V. When migrating from PIC16F73 firmware, verify CCP and timer port assignments since the PIC16F74 has additional ports D and E that map differently.
Route the analog signals (RA0-RA5, RE0-RE2) away from the high-current digital lines on PORTD. The parallel slave port (PSP) on PORTD can inject fast edge rates; isolate with a ground trace or place analog inputs on PORTE where possible. Keep the ICSP clock/data lines (RB6/RB7) accessible for in-circuit programming during bring-up.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product declaration. Not AEC-Q100 qualified - choose the automotive-grade PIC16F74-E/ML or PIC18F family for AEC-Q100 requirements.
