PIC16LC74A-04I/P - 8-bit 4MHz MCU 7KB OTP 40-PDIP | Microchip
MPN: PIC16LC74A-04I/P ✗ Cuối đờiPIC16LC74A-04I/P Tóm tắt
What is an 8-bit microcontroller? An 8-bit microcontroller is a self-contained computing IC that integrates a CPU, memory (program + RAM), and peripherals on a single die. PIC microcontrollers use a Harvard RISC architecture with separate program/data buses, enabling deterministic instruction timing of one instruction per cycle (4 clock cycles). The PIC16C7X family to which PIC16LC74A belongs is a mid-range family, sitting between the baseline PIC10/12/16 and the enhanced PIC18 family in capability and pin count.
Key features include 33 digital I/O lines, a 5-channel 8-bit Analog-to-Digital Converter (ADC), 2 capture/compare/PWM (CCP) modules, a USART for serial communication, an SSP (Synchronous Serial Port), three timers, and 11 interrupt sources. The OTP (One-Time Programmable) program memory means it can be programmed once and is intended for volume production, distinguishing it from windowed EPROM or flash-based siblings.
The architecture pairs a 14-bit instruction word with an 8-bit data path, supporting 35 single-cycle instructions at 1 MIPS performance. The LC suffix denotes the low-voltage/low-power CMOS process, allowing operation down to 2.5V and reducing active power draw, suitable for battery-powered or power-budgeted designs.
Typical applications include industrial control systems, automotive body electronics (non-safety), appliance control, sensor signal conditioning, and embedded instrumentation. Its 40-pin PDIP form factor remains favored for legacy designs, educational platforms, and through-hole manufacturing lines.
When designing with PIC16LC74A-04I/P, ensure the OTP programming step is planned before PCB assembly. Use MPLAB IDE with a compatible programmer such as PICkit 3 or ICD for development; note that OTP parts are field-non-rewritable.
This page consolidates distributor pricing, drop-in alternatives, and practical design notes not found in the standalone datasheet, helping engineers evaluate the PIC16LC74A-04I/P against modern flash-based equivalents for both new designs and legacy maintenance.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC74A-04I/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 PIC16LC74A-04I/P (cùng hình factor và footprint) — khác nhau ở Package, Timers, ADC, Mounting Type, Program Memory Size.
PIC16C74A-04I/P
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Xem tài liệu →PIC16LC74A-04I/P Tỷ lệ tối đa & tính chất điện
| Core | 8-bit PIC (RISC, Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM | 192 bytes |
| EEPROM | 0 bytes |
| Maximum CPU Frequency | 4 MHz |
| Operating Voltage Range | 2.5 V to 6 V |
| I/O Pins | 33 |
| ADC | 8-bit, 5 channels |
| Timers | 3 (Timer0, Timer1, Timer2) |
| CCP Modules | 2 |
| Serial Interfaces | USART, SSP (Synchronous Serial Port) |
| Interrupt Sources | 11 |
| Hộp | 40-pin PDIP (DIP-40) |
| Kiểu lắp đặt | Through-Hole |
| Khoảng nhiệt độ hoạt động | -40C to +85C (Industrial) |
| Process Technology | CMOS, LC (low-power) variant |
Cấu hình chân PIC16LC74A-04I/P
| Chân 1 | MCLR/VPP — Master Clear (reset) input / Programming voltage |
| 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 reference |
| Chân 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SSP slave select |
| Chân 8 | OSC1/CLKIN — Oscillator crystal input / external clock |
| Chân 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 12 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Chân 13 | RC3/SCK/SCL — PORTC bit 3 / SSP clock / I2C clock |
| Chân 14 | RC4/SDI/SDA — PORTC bit 4 / SSP data in / I2C data |
| Chân 15 | RC5/SDO — PORTC bit 5 / SSP 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 |
| Chân 19 | VSS — Ground (second pin) |
| Chân 20 | VDD — Positive supply voltage |
| Chân 21 | RB0/INT — PORTB bit 0 / External interrupt |
| Chân 22 | RB1 — PORTB bit 1 |
| Chân 23 | RB2 — PORTB bit 2 |
| Chân 24 | RB3/PGM — PORTB bit 3 / Low-voltage programming |
| Chân 25 | RB4 — PORTB bit 4 |
| Chân 26 | RB5 — PORTB bit 5 |
| Chân 27 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 28 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 29 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| Chân 30 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| Chân 31 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| Chân 32 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| Chân 33 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| Chân 34 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| Chân 35 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| Chân 36 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| Chân 37 | VSS — Ground (third pin) |
| Chân 38 | VDD — Positive supply voltage (second pin) |
| Chân 39 | RE0/RD/AN5 — PORTE bit 0 / Read control / Analog input 5 |
| Chân 40 | RE1/WR/AN6 — PORTE bit 1 / Write control / Analog input 6 |
Ứng dụng tiêu biểu
PIC16LC74A-04I/P phù hợp cho 6 Áp dụngs: Industrial Process Control Systems, Appliance Control Boards, Sensor Signal Conditioning, Educational 8-bit Microcontroller Platforms, Automotive Body Electronics (Non-Safety), LED Display and Signage Controllers.
Industrial Process Control Systems
The PIC16LC74A-04I/P fits industrial process control applications thanks to its 5-channel 8-bit ADC, 33 I/O pins, and USART for SCADA/modem connectivity. The PIC16C7X architecture's deterministic 1-MIPS performance at 4 MHz ensures predictable control loop timing for closed-loop valve and actuator control. The LC process technology enables reliable 3.3 V operation from a 24V industrial bus with a simple linear regulator. The -40C to +85C industrial temperature range covers factory floor and unheated enclosures.
Được đề xuất
Appliance Control Boards
The PIC16LC74A-04I/P's 2 CCP modules deliver PWM for motor speed control in washing machines, dishwashers, and HVAC damper actuators. Its 33 I/O pins connect directly to LED indicators, keypads, and triac-driven AC loads with zero-cross optoisolators. OTP memory locks the firmware to prevent field tampering, while the 2.5 V to 6 V supply range works from 5 V regulated rails. The 192-byte RAM supports state-machine control loops without external memory.
Được đề xuất
Sensor Signal Conditioning
The PIC16LC74A-04I/P's integrated 8-bit ADC and USART enable cost-efficient analog sensor hub designs for industrial 4-20 mA loops and bridge sensor interfaces. The 5 analog channels are adequate for multi-sensor PCB modules (temperature, pressure, humidity) where the MCU performs linearization and serial telemetry. The 4 MHz CPU supports 10 ms polling loops, the typical refresh interval for environmental sensors. The LC process keeps quiescent current low for solar-powered remote sensors.
Được đề xuất
Educational 8-bit Microcontroller Platforms
The PIC16LC74A-04I/P serves as a learning platform in university embedded systems courses, where students program the OTP part with MPLAB XC8 and PICkit 3. Its 33 I/O pins and full peripheral set (ADC, USART, PWM, timers) provide exposure to the complete 8-bit MCU feature set without flash write-cycle complexities. The 40-pin PDIP form factor fits standard 0.1 inch pitch solderless breadboards, simplifying lab use.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The PIC16LC74A-04I/P is suited for non-safety automotive body modules including lighting controllers, seat position memories, and HVAC blend door actuators. The 33 I/O drive low-side MOSFETs for LED arrays and small DC motors directly, with PWM for fade-in/out dimming via the CCP modules. The -40C to +85C rating covers cabin and underhood-adjacent environments. For safety-critical modules, migrate to PIC18F family with automotive AEC-Q100 grade.
Được đề xuất
LED Display and Signage Controllers
The PIC16LC74A-04I/P's 33 I/O drive multiplexed 7-segment LED matrices and dot-matrix signs without external drivers when brightness is moderate. The CCP modules generate multiplex refresh without CPU load, and the USART connects to upstream serial control busses (RS-485 or RS-232). OTP memory secures the message set from field tampering in commercial signage. The 192-byte RAM is sufficient for 16-character scrolling buffers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC74A-04I/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 | PIC16C74A-04I/P | PIC16LC74A-04I/PQ | PIC16LC74A-04/P | PIC16F74-I/P |
|---|---|---|---|---|---|
| Package | 40-pin PDIP (DIP-40) | 40-pin PDIP - same | 44-pin MQFP - same silicon, different footprint | 40-pin PDIP - same | 40-pin PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Operating Voltage | 2.5 V to 6 V (LC) | 3.5 V to 6 V (C) | 2.5 V to 6 V | 2.5 V to 6 V | 2.0 V to 5.5 V |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | 0C to +70C (Commercial) | -40C to +85C |
| Max CPU Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Memory Type | OTP - one-time write | OTP - one-time write | OTP - one-time write | OTP - one-time write | Flash - in-system reprogrammable |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active |
Bảo phân biệt quan trọng
- Low-voltage LC process enables 2.5 V operation (vsPIC16C74A-04I/P)
- Flash memory enables in-system reprogramming (vsPIC16F74-I/P)
- 33 I/O pins support widest mid-range connectivity (vsPIC16LC73A-04I/P)
Ghi chú thiết kế
PIC16LC74A-04I/P uses OTP (One-Time Programmable) memory that cannot be erased or rewritten after programming. Use windowed PIC16C74A-04I/P (with quartz window, suffix /JW) or PIC16F74-I/P for prototyping and firmware iteration. Once OTP bits are written, the only way to fix bugs is a new silicon revision, so test firmware thoroughly on flash or windowed equivalents before committing to OTP parts.
The LC (low-power CMOS) variant supports 2.5 V to 6 V supply, enabling direct 3.3 V operation from a low-dropout regulator. For sleep-mode designs, verify clock source on OSC1 is stopped or running from Timer1 with a 32.768 kHz crystal to retain time-of-day functionality. Brown-out reset (BOR) is recommended below 4.5 V VDD to prevent code runaway during battery droop. Use MCP1700 LDO for stable 3.3 V from a 5 V rail.
The 40-pin PDIP package requires standard 0.1 inch (2.54 mm) through-hole pads with at least 0.6 mm hole diameter for robust wave-soldering. Place VDD/VSS decoupling capacitors (100 nF ceramic + 10 uF tantalum) within 5 mm of pins 11/12 and 31/32 with short traces to ground plane. For analog ADC accuracy, separate AVdd/AVss is not present on this part; use a ferrite bead on VDD and a clean analog ground to improve ADC noise performance.
For reliable ICSP (In-Circuit Serial Programming) via PICkit 3/ICD, expose the PGC (pin 27), PGD (pin 28), and MCLR/VPP (pin 1) signals on a 0.1 inch header. Add a 10 kohm pull-up on MCLR to VDD and a 100 nF capacitor from MCLR to ground for noise immunity; do NOT omit the MCLR capacitor or the MCU may spontaneously reset in noisy environments. Reserve space for a through-hole crystal plus 22 pF loading capacitors on pins 8/9.
Thông tin tuân thủ
RoHS and REACH compliance status not specified in verified distributor data; Microchip typically marks legacy OTP PIC16C7X family as non-RoHS due to OTP process, but no certificate was verified. Part is not AEC-Q100 qualified for automotive safety applications.
