PIC16C74B-20/L - 8-Bit OTP MCU 7KB 20MHz 44-PLCC | Microchip
MPN: PIC16C74B-20/L ✓ Hoạt độngPIC16C74B-20/L Tóm tắt
What is a PIC mid-range 8-bit MCU? A PIC (Peripheral Interface Controller) microcontroller is a compact integrated circuit that combines a CPU, memory, and programmable peripherals on a single die. The mid-range family (PIC16C) sits between baseline (PIC10/12/16F general-purpose) and enhanced mid-range (PIC18) families, offering 35 single-word instructions, 14-bit instruction width, and a balance of peripherals for embedded control. PIC16C parts use OTP (one-time programmable) EPROM program memory, which is differentiated from flash-based PIC16F variants.
Key features include 8 channels of 8-bit Analog-to-Digital conversion, two 8-bit and one 16-bit timer/counter modules, two Capture/Compare/PWM (CCP) peripherals, a synchronous serial port configurable as SPI or I2C, and a USART for asynchronous serial communication. Operating voltage spans 4.0V to 5.5V, suiting legacy 5V industrial and embedded designs.
The architecture employs a Harvard design with separate program and data buses, allowing 14-bit instruction fetch and 8-bit data access in a single cycle. Brown-out Reset (BOR), Watchdog Timer (WDT), and Power-on Reset (POR) provide robust operation in noisy environments. The 44-PLCC package gives 33 I/O - more than 28-pin PIC16C73 family members.
Typical applications include industrial process controllers, motor control subsystems, instrumentation front-ends, and automotive body electronics where code stability and 5V tolerance outweigh the need for in-system reprogrammability.
When migrating designs, consider PIC16F74 flash variants for in-circuit reprogrammability - the pinout is compatible with PLCC-44 footprints.
This page synthesizes current distributor pricing, drop-in PIC16C74B alternatives, and PLCC-44 design notes not consolidated on the Microchip product page.
Bộ thay thế dễ dàng lắp đặt cho PIC16C74B-20/L — 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 PIC16C74B-20/L (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Serial Interfaces, Timers, ADC.
PIC16C74B-04I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74BT-20/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74B-20E/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F74-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-20/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74B-20/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC mid-range (14-bit instruction) |
| Program Memory Size | 7 KB (4K x 14) OTP EPROM |
| RAM Size | 192 bytes |
| Data EEPROM | Not present (OTP device) |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Supply Voltage (Vdd) | 4.0 V to 5.5 V |
| I/O Pins | 33 |
| Analog-to-Digital Converter | 8 channels x 8-bit |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Capture/Compare/PWM | 2 CCP modules |
| Serial Interfaces | SPI, I2C (MSSP), USART |
| Hộp / Vỏ | 44-PLCC (16.59 x 16.59 mm), J-Lead |
| Nhiệt độ hoạt động | 0 C to +70 C (commercial) |
| Kiểu lắp đặt | Surface Mount |
| ROM Type | One-Time Programmable (OTP) |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16C74B-20/L
| Chân 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Chân 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Chân 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC reference |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer 0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / Analog 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog 5 |
| Chân 9 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog 6 |
| Chân 10 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog 7 |
| Chân 11 | VSS — Ground |
| Chân 12 | OSC1/CLKIN — Oscillator input / external clock |
| Chân 13 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 14 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / clock in |
| Chân 15 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Chân 16 | RC2/CCP1 — PORTC bit 2 / Capture Compare PWM 1 |
| Chân 17 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 18 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 19 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 20 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Chân 21 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Chân 22 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Chân 23 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Chân 24 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Chân 25 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Chân 26 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Chân 27 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Chân 28 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Chân 29 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Chân 30 | VSS — Ground |
| Chân 31 | VDD — Positive supply voltage |
| Chân 32 | RB0/INT — PORTB bit 0 / External interrupt |
| Chân 33 | RB1 — PORTB bit 1 |
| Chân 34 | RB2 — PORTB bit 2 |
| Chân 35 | RB3 — PORTB bit 3 |
| Chân 36 | RB4 — PORTB bit 4 |
| Chân 37 | RB5 — PORTB bit 5 |
| Chân 38 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 39 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 40 | VSS — Ground (additional) |
| Chân 41 | VDD — Positive supply voltage (additional) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16C74B-20/L phù hợp cho 6 Áp dụngs: Industrial Process Controller, Motor Control Subsystem, Instrumentation Front-End, Automotive Body Electronics, Embedded Sensor Hub, Legacy 5V Embedded Replacement.
Industrial Process Controller
The PIC16C74B-20/L fits industrial process controllers with its 33 I/O pins, 8-channel 8-bit ADC, and 20 MHz execution. Its 4.0-5.5V operation aligns with legacy 24V/5V industrial bus systems, and the 44-PLCC footprint accommodates through-hole or socketed installation common in factory-floor equipment. The 7KB OTP memory stores fixed control algorithms (PID loops, valve sequencing) where code stability outweighs field reprogrammability needs.
Được đề xuất
Motor Control Subsystem
The PIC16C74B-20/L serves motor control subsystems via its two Capture/Compare/PWM (CCP) modules that generate precise PWM signals for DC motor speed control. With 200 ns instruction cycle at 20 MHz, the controller can update PID parameters fast enough for closed-loop motor regulation at industrial PWM frequencies. The 8-channel ADC samples current and position feedback, while the USART interfaces to encoder inputs. OTP memory secures the control algorithm from field tampering.
Được đề xuất
Instrumentation Front-End
The PIC16C74B-20/L excels in instrumentation front-ends requiring 8 channels of analog input for sensor multiplexing. Its 8-bit ADC delivers 19.5 us conversion at 20 MHz, sufficient for temperature, pressure, and flow sensing at typical industrial sampling rates. The synchronous serial port (SPI/I2C) interfaces with external 12-bit or 16-bit ADCs for higher-resolution measurements, while the USART outputs data to a host controller or display.
Được đề xuất
Automotive Body Electronics
The PIC16C74B-20/L is suitable for non-safety automotive body electronics such as climate control panels, lighting controllers, and HVAC actuators. Its extended-temperature sibling PIC16C74B-20E/L (same 44-PLCC) operates from -40 C to +125 C, meeting under-hood thermal demands. The 33 I/O pins handle multiple switch inputs and relay outputs, while the 8-channel ADC reads thermistors and position sensors. OTP memory prevents unauthorized firmware modification in deployed vehicles.
Được đề xuất
Embedded Sensor Hub
The PIC16C74B-20/L acts as a sensor hub aggregating data from multiple SPI/I2C sensors and forwarding through USART. Its 192-byte RAM and 7KB program memory handle multi-sensor polling loops and basic digital filtering. The PIC16C74B-20/L's MSSP module addresses multiple I2C slaves, while dedicated timers generate sample-timing interrupts. This makes it ideal for environmental monitoring stations and agricultural sensor networks.
Được đề xuất
Legacy 5V Embedded Replacement
The PIC16C74B-20/L serves as a pin-compatible replacement in legacy 5V embedded designs originally built around older PIC16C7x controllers. According to Microchip pin compatibility charts, the 44-PLCC footprint matches PIC16C63A, PIC16C65B, PIC16C73B, and PIC16C74A, enabling direct socket-level substitution. Designers upgrading from older parts benefit from the PIC16C74B's enhanced peripherals (extra ADC channels, second CCP) without PCB rework.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C74B-20/L — 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 | PIC16C74B-04I/L | PIC16F74-I/L | PIC16C74A-20/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| CPU Frequency | 20 MHz | 4 MHz | 20 MHz | 20 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB Flash | 4 KB OTP |
| I/O Pins | 33 | 33 | 33 | 33 |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit |
| Operating Voltage | 4.0-5.5 V | 4.0-5.5 V | 2.0-5.5 V (wider range) | 4.0-5.5 V |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | 0 C to +70 C |
Bảo phân biệt quan trọng
- Highest program memory in 44-PLCC PIC16C7x family (vsPIC16C74A-20/L)
- Flash-based reprogrammability (vsPIC16C74B-20/L vs PIC16F74-I/L)
- Industrial temperature grade option available (vsPIC16C74B-20E/L)
Ghi chú thiết kế
Place a 100 nF decoupling capacitor as close as possible to each Vdd pin (pins 31 and 41 on the 44-PLCC) with the ground return connected to the nearest Vss pin. For 20 MHz operation at full I/O switching load, add a 10 uF bulk tantalum or aluminum polymer capacitor near the MCU. PLCC-44 sockets should use machined-pin sockets (e.g., Aries 44-650000-11) for reliable field replacement in industrial installations.
Brown-out Reset (BOR) must be configured in the configuration word for reliable operation. With Vdd supply transitions below 4.0 V, BOR holds the MCU in reset until stable voltage returns. If 3.3 V operation is required, the PIC16F74-I/L flash variant is recommended since PIC16C74B-20/L is rated only for 4.0-5.5 V operation. Add a 1N4148 diode from MCLR to Vdd for additional ESD protection on the reset line.
OTP (One-Time Programmable) memory cannot be erased - once programmed, the PIC16C74B-20/L cannot be reprogrammed. Always validate code on a flash-based PIC16F74-I/L prototype before committing to OTP production programming. Also note: ICSP (In-Circuit Serial Programming) uses pins RB6/PGC and RB7/PGD, which conflicts with PORTB bit 6/7 use during debug - design the PCB to expose these pins to a programming header without interfering with application circuitry.
Thông tin tuân thủ
RoHS compliant per Microchip product page. PIC16C74B-20/L is not AEC-Q100 qualified; for AEC-Q100 automotive applications use PIC16C74B-20E/L (extended temp grade) or migrate to PIC16F874A automotive-grade variant.
