PIC16C74A-20I/P - 8-bit 20MHz OTP MCU 7KB | Microchip DIP-40
MPN: PIC16C74A-20I/P ✓ Hoạt độngPIC16C74A-20I/P Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces on one silicon die. The PIC16C7X family uses Microchip's enhanced Harvard RISC architecture with 35 single-word instructions, where all instructions execute in one cycle except program branches which take two; this streamlined instruction set reduces code size and improves deterministic interrupt response compared with CISC 8-bit MCUs.
Key features include 7 KB OTP program memory (4K x 14 words), 192 bytes of SRAM data memory, an 8-channel 8-bit A/D converter, two CCP modules for PWM/capture/compare, a USART for asynchronous serial communication, and an MSSP module supporting SPI and I2C. Power consumption is 15 uA typical at 5 V / 4 MHz and 1 uA typical standby at 3 V / 32 kHz, supporting battery-backed designs.
The architecture is fully static CMOS with a 14-bit instruction word, allowing DC to 20 MHz operation. With 35 single-word instructions, single-cycle execution (200 ns at 20 MHz) and a 4-cycle hardware multiplier (8 x 8 in one instruction), the PIC16C74A delivers approximately 5 MIPS throughput. The 8-bit A/D converter uses successive-approximation conversion with analog input multiplexing, allowing direct connection of sensors without external sample-and-hold.
Typical applications include industrial automation controllers, motor drive PWM stages, sensor signal conditioning, instrumentation front-ends, consumer appliance controllers, and embedded communication bridges. For new designs, Microchip recommends the flash-based PIC16F74 as the modern drop-in equivalent with in-system reprogrammability.
Design consideration: OTP memory means firmware is programmed once and cannot be erased - choose the PIC16F74 for prototypes or field-upgradable firmware. Ensure the MCLR reset circuit uses the recommended RC configuration per the datasheet for reliable power-on reset.
This page synthesizes distributor pricing, drop-in alternatives, and engineering design guidance not always presented together in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16C74A-20I/P — 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 PIC16C74A-20I/P (cùng hình factor và footprint) — khác nhau ở Package, Timers, Core Architecture, Serial Interfaces, I/O Pins.
PIC16F74-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-20/PQ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C74A-10I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74B-20I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04I/P
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16F17176-I/P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74A-20I/P Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC16CXX mid-range RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| Data RAM | 192 bytes |
| Data EEPROM | Not present (OTP family) |
| Maximum Clock Speed | 20 MHz |
| Instruction Execution | 200 ns (one cycle, except branches 400 ns) |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| I/O Pins | 33 |
| A/D Converter | 8-channel, 8-bit |
| Timers | Two 8-bit + one 16-bit (TMR0/TMR1/TMR2) |
| CCP Modules | 2 (Capture / Compare / PWM) |
| Serial Interfaces | USART + SSP (SPI / I2C) |
| Watchdog Timer | Yes (on-chip WDT with dedicated RC oscillator) |
| I/O Sink/Source Current | 25 mA / 25 mA per pin |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Hộp | 40-pin PDIP (0.600 in / 15.24 mm) |
| Kiểu lắp đặt | Through-Hole (DIP) |
| Cấp MSL | Not applicable (through-hole package) |
| Recommended Modern Replacement | PIC16F74 (flash-based, pin-compatible family) |
Cấu hình chân PIC16C74A-20I/P
| Chân 1 | MCLR — Master Clear (reset) input, active low |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Chân 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC Vref |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Chân 8 | OSC1/CLKIN — Crystal oscillator input / external clock in |
| Chân 9 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock in |
| Chân 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 output |
| Chân 12 | RC2/CCP1 — PORTC bit 2 / CCP1 (PWM/Capture/Compare) output |
| Chân 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 18 | GND — Ground reference |
| Chân 19 | VDD — Positive supply (4.0 V to 5.5 V) |
| Chân 20 | RB0/INT — PORTB bit 0 / External interrupt input |
| Chân 21 | RB1 — PORTB bit 1 |
| Chân 22 | RB2 — PORTB bit 2 |
| Chân 23 | RB3 — PORTB bit 3 |
| Chân 24 | RB4 — PORTB bit 4 |
| Chân 25 | RB5 — PORTB bit 5 |
| Chân 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 28 | RD0 — PORTD bit 0 |
| Chân 29 | RD1 — PORTD bit 1 |
| Chân 30 | RD2 — PORTD bit 2 |
| Chân 31 | RD3 — PORTD bit 3 |
| Chân 32 | RD4 — PORTD bit 4 |
| Chân 33 | RD5 — PORTD bit 5 |
| Chân 34 | RD6 — PORTD bit 6 |
| Chân 35 | RD7 — PORTD bit 7 |
| Chân 36 | RE0/AN5 — PORTE bit 0 / Analog input 5 |
| Chân 37 | RE1/AN6 — PORTE bit 1 / Analog input 6 |
| Chân 38 | RE2/AN7 — PORTE bit 2 / Analog input 7 |
| Chân 39 | VSS — Ground (secondary) |
| Chân 40 | VDD — Positive supply (secondary) |
Ứng dụng tiêu biểu
PIC16C74A-20I/P phù hợp cho 6 Áp dụngs: Industrial Automation Controllers, Motor Drive PWM Control, Sensor Signal Conditioning Front-End, Consumer Appliance Control Boards, Embedded Communication Bridges, Instrumentation and Test Equipment.
Industrial Automation Controllers
The PIC16C74A-20I/P's 8-channel 8-bit A/D converter, two CCP/PWM modules, USART, and 33 I/O pins make it a strong fit for industrial automation controllers that aggregate multiple sensor inputs and drive actuator outputs. At 20 MHz, it executes 200 ns single-cycle instructions, allowing deterministic scan loops for PLC-style logic. The industrial -40C to +85C temperature grade supports factory-floor enclosures, while 25 mA sink/source per pin can directly drive optocouplers that isolate 24 V field-side drivers without external buffers.
Được đề xuất
Motor Drive PWM Control
With two CCP modules generating PWM at up to 10-bit resolution and a 16-bit TMR1 for precise commutation timing, the PIC16C74A-20I/P can drive low-cost BLDC and stepper motor controllers. The 20 MHz clock enables 50 kHz PWM with sub-microsecond duty-cycle resolution, sufficient for torque-ripple-sensitive applications. The 33 I/O lines accept Hall-sensor or quadrature-encoder feedback directly; 25 mA sink/source current is adequate to drive optocoupled gate drivers for IGBT/MOSFET power stages rated up to several kW.
Được đề xuất
Sensor Signal Conditioning Front-End
The PIC16C74A-20I/P's 8-channel 8-bit A/D converter directly digitizes analog signals from temperature sensors, pressure transducers, potentiometers, and bridge sensors without external sample-and-hold. The 20 MHz interface lets the MCU run background filtering algorithms (moving average, Kalman) at sample rates up to ~50 kSPS aggregate, well above most low-frequency industrial sensing requirements. The USART plus MSSP provide simultaneous SPI/I2C connection to digital sensors and a wired backhaul link, all from a single chip.
Được đề xuất
Consumer Appliance Control Boards
Cost-sensitive appliance controllers - washing machines, dishwashers, microwave ovens, HVAC blowers - benefit from the PIC16C74A-20I/P's 7 KB OTP, integrated A/D, PWM, and USART in a single 40-pin PDIP part. With 192 bytes of RAM, the MCU can manage keypad scanning, LED/LCD multiplexing, and serial communication concurrently. The 4.0 V to 5.5 V supply range aligns with rectified 5 V rails common in white goods, and the industrial temperature grade handles under-cabinet thermal environments.
Được đề xuất
Embedded Communication Bridges
The PIC16C74A-20I/P integrates both USART (asynchronous RS-232/485) and MSSP (SPI / I2C) peripherals, allowing it to act as a protocol bridge between incompatible field devices. At 20 MHz, it can sustain sustained serial throughput up to ~1 Mbps with low interrupt overhead. Industrial temperature grade, 25 mA I/O drive, and 40-pin PDIP packaging make it serviceable in DIN-rail gateway hardware, where through-hole parts ease hand-rework during prototyping or field service.
Được đề xuất
Instrumentation and Test Equipment
For handheld meters, panel instruments, and laboratory test gear, the PIC16C74A-20I/P's 8-bit ADC, 16-bit TMR1 for event timing, and USART for PC datalogging provide a complete mixed-signal front end. The 5 MIPS throughput allows real-time RMS calculation or FFT-lite post-processing of sensor data while still servicing display updates. The 192-byte RAM supports circular data buffers for short captures, and 25 mA I/O drive directly backlights small character LCDs without external buffers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C74A-20I/P — 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 | PIC16F74-I/P | PIC16C74A-20/P | PIC16C74A-10I/P | PIC16C74B-20I/P | PIC16C74A-04I/P | PIC16F17176-I/P |
|---|---|---|---|---|---|---|---|
| Package | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP | 40-pin PDIP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 20 MHz | 4 MHz | 32 MHz (max for PIC16F1 family) |
| Program Memory | 7 KB OTP | 7 KB Flash | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 28 KB Flash |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 2048 bytes |
| A/D Converter | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit (improved) | 8 ch x 8-bit | varies by family member (8 ch x 10-bit typical) |
| CCP Modules | 2 | 2 | 2 | 2 | 2 (enhanced) | 2 | varies (typically 3-4) |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | ~35 |
| Reprogrammability | No (OTP) | Yes (Flash, in-system) | No (OTP) | No (OTP) | No (OTP) | No (OTP) | Yes (Flash, in-system) |
Bảo phân biệt quan trọng
- Industry-standard 40-pin PDIP with full peripheral integration (vsPIC16C73B-20I/P)
- Industrial temperature grade with 20 MHz performance (vsPIC16C74A-04I/P)
- Mature, widely-available drop-in replacement path to flash (vsPIC16C72-20I/P)
Ghi chú thiết kế
OTP program memory means firmware cannot be erased or rewritten after programming - a single code-change after production requires re-spinning every unit. For prototypes, development fleets, or any product likely to receive firmware updates, choose the PIC16F74 (flash-based, same 40-pin PDIP pinout) instead. Reserve the PIC16C74A-20I/P for fully qualified, locked-firmware production where cost per unit is paramount.
The PIC16C74A-20I/P operates from 4.0 V to 5.5 V; voltages below 4 V risk BOR (brown-out reset) or ADC reference drift. Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair (pin 19/18 and pin 40/39) plus a bulk 10 uF tantalum or ceramic on the main 5 V rail. For battery-backed designs, use a low-Iq LDO such as MCP1700 in series with the supply to maintain standby current below 1 uA when the MCU is in sleep mode.
The 40-pin PDIP footprint (0.600 in / 15.24 mm row spacing) accepts standard IC sockets, which is recommended for prototype and serviceable designs. Reserve a small prototype area near the MCU for an ICSP header (RB6/PGC, RB7/PGD, MCLR, VDD, GND) so OTP units can be programmed in-circuit before socket insertion. Keep crystal traces short (<= 10 mm) and guard OSC1/OSC2 with a ground ring to reduce EMI pickup on the 20 MHz oscillator.
Pin 1 (MCLR) requires a 10 kohm pull-up to VDD for normal operation and a 100 nF capacitor to ground for noise immunity - omitting the cap makes the reset line susceptible to noise-induced spurious resets. The ADC inputs (RA0-RA5, RE0-RE2) should be routed away from digital switching lines; a ground keep-out zone around the analog traces plus a star-ground topology at the AVdd pin improves ADC accuracy by 1-2 LSB.
The PIC16C74A-20I/P's I/O sink/source of 25 mA per pin is sufficient for small relays or optocouplers but inadequate for direct solenoid or motor drive - always buffer high-current loads with discrete transistors or MOSFETs. When using PWM outputs at frequencies above 25 kHz, place a small RC filter (100 ohm + 100 pF) on the PWM line near the MCU to slow edge rates and reduce radiated EMI.
Thông tin tuân thủ
RoHS, REACH, lead-free, and halogen-free status were not explicitly stated in the verified web data; consult the manufacturer product page or lot-specific documentation for definitive compliance. AEC-Q100 is not applicable - this is a general-purpose industrial MCU, not automotive-qualified.
