PIC16LC74B-04I/P - 8-Bit 4MHz CMOS MCU 7KB OTP 40-PDIP | Microchip
MPN: PIC16LC74B-04I/P ✗ Cuối đờiPIC16LC74B-04I/P Tóm tắt
A mid-range PIC microcontroller is an 8-bit Harvard-architecture device that separates program and data memory to allow simultaneous fetching, enabling deterministic single-cycle instruction execution. Within Microchip's broader taxonomy, the PIC16LC74B sits in the PIC16C mid-range family, which evolved into the PIC16F flash family in the late 1990s. Today the device is positioned as a legacy OTP MCU used in designs where flash-based PIC16F1xxx migration is not desired or where the OTP cost model fits the application.
Key features of the PIC16LC74B-04I/P include 192 bytes of data RAM, five 8-bit I/O ports (PORTA..PORTE), three timer/counters, a USART, an SSP module supporting SPI and I2C, an 8-channel 8-bit ADC, and capture/compare/PWM peripherals. The 33 I/O pins support individual direction control, and the device includes a watchdog timer with its own on-chip RC oscillator for reliable recovery from software lockups. The OTP program memory allows the device to be programmed once and retain its code indefinitely.
Typical applications include industrial control panels, appliance controllers, sensor interface modules, low-cost remote controls, and legacy embedded systems where the OTP memory model fits the production programming strategy. When designing with this MCU, ensure the maximum operating frequency of 4 MHz is respected and that the brown-out reset and watchdog timer are properly configured for the application environment.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC74B-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 PIC16LC74B-04I/P (cùng hình factor và footprint) — khác nhau ở Timers, Core, Program Memory Type, Mounting Type, Package.
PIC16F74-I/P
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Xem tài liệu →PIC16LC74B-04I/P Tỷ lệ tối đa & tính chất điện
| Manufacturer | Microchip Technology |
| Series | PIC 16C |
| Core Processor | PIC |
| Core Size | 8-Bit |
| Tần số xung maksimum | 4 MHz |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 B |
| Number of I/O Pins | 33 |
| Package Type | 40-pin PDIP |
| Kiểu lắp đặt | Through Hole |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (industrial, "I" grade) |
| Oscillator Type | External (per -04 speed grade, max 4 MHz) |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT, USART, SSP (SPI/I2C) |
| Connectivity | UART/USART, SPI, I2C (SSP) |
| Program Memory Type | OTP (One-Time Programmable) |
| Trạng thái RoHS | Unknown (PDIP package variant) |
Cấu hình chân PIC16LC74B-04I/P
| Chân 1 | MCLR/VPP — Master Clear (reset) input / Programming voltage |
| Chân 2 | RA0/AN0 — PORTA bit0 / Analog channel 0 |
| Chân 3 | RA1/AN1 — PORTA bit1 / Analog channel 1 |
| Chân 4 | RA2/AN2/VREF- — PORTA bit2 / Analog channel 2 / ADC negative reference |
| Chân 5 | RA3/AN3/VREF+ — PORTA bit3 / Analog channel 3 / ADC positive reference |
| Chân 6 | RA4/T0CKI — PORTA bit4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — PORTA bit5 / Analog channel 4 / SPI slave select |
| Chân 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| Chân 10 | RC0/T1OSO/T1CKI — PORTC bit0 / Timer1 oscillator output / Timer1 clock input |
| Chân 11 | RC1/T1OSI/CCP2 — PORTC bit1 / Timer1 oscillator input / CCP2 module |
| Chân 12 | RC2/CCP1 — PORTC bit2 / CCP1 PWM/capture/compare |
| Chân 13 | RC3/SCK/SCL — PORTC bit3 / SPI clock / I2C clock |
| Chân 14 | RC4/SDI/SDA — PORTC bit4 / SPI data in / I2C data |
| Chân 15 | RC5/SDO — PORTC bit5 / SPI data out |
| Chân 16 | RC6/TX/CK — PORTC bit6 / USART TX / USART clock |
| Chân 17 | RC7/RX/DT — PORTC bit7 / USART RX / USART data |
| Chân 18 | RD0/PSP0 — PORTD bit0 / Parallel Slave Port bit0 |
| Chân 19 | RD1/PSP1 — PORTD bit1 / Parallel Slave Port bit1 |
| Chân 20 | RD2/PSP2 — PORTD bit2 / Parallel Slave Port bit2 |
| Chân 21 | RD3/PSP3 — PORTD bit3 / Parallel Slave Port bit3 |
| Chân 22 | RD4/PSP4 — PORTD bit4 / Parallel Slave Port bit4 |
| Chân 23 | RD5/PSP5 — PORTD bit5 / Parallel Slave Port bit5 |
| Chân 24 | RD6/PSP6 — PORTD bit6 / Parallel Slave Port bit6 |
| Chân 25 | RD7/PSP7 — PORTD bit7 / Parallel Slave Port bit7 |
| Chân 26 | VSS — Ground reference |
| Chân 27 | VDD — Positive supply voltage |
| Chân 28 | RE0/RD/AN5 — PORTE bit0 / Read control / Analog channel 5 |
| Chân 29 | RE1/WR/AN6 — PORTE bit1 / Write control / Analog channel 6 |
| Chân 30 | RE2/CS/AN7 — PORTE bit2 / Chip select / Analog channel 7 |
| Chân 31 | RB0/INT — PORTB bit0 / External interrupt |
| Chân 32 | RB1 — PORTB bit1 |
| Chân 33 | RB2 — PORTB bit2 |
| Chân 34 | RB3 — PORTB bit3 |
| Chân 35 | RB4 — PORTB bit4 |
| Chân 36 | RB5 — PORTB bit5 |
| Chân 37 | RB6/PGC — PORTB bit6 / ICSP clock (programming/debug) |
| Chân 38 | RB7/PGD — PORTB bit7 / ICSP data (programming/debug) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC16LC74B-04I/P phù hợp cho 6 Áp dụngs: Industrial Control Panels, Appliance Controllers, Sensor Interface Modules, Low-Cost Remote Controls, Legacy Embedded Systems, Educational and Hobby Projects.
Industrial Control Panels
The PIC16LC74B-04I/P suits industrial control panels requiring 33 I/O pins for keypad scanning, LED matrix driving, and relay switching. Its 7 KB OTP memory holds menu logic, while the USART provides RS-232 communication with HMIs. The -40C to +85C industrial temperature range supports factory floor and outdoor cabinet deployment without thermal derating. The integrated ADC reads sensor inputs (temperature, pressure) while the SSP supports I2C peripherals. The 4 MHz clock is sufficient for panel update rates and slow control loops.
Được đề xuất
Appliance Controllers
The PIC16LC74B-04I/P's 33 I/O lines and PWM/capture modules suit washing machine, dishwasher, and oven control boards driving relays, triacs, and motor bridges. The 192-byte RAM handles user-interface state, while the OTP 7 KB program memory stores the appliance cycle logic. The "LC" low-power process reduces standby current for Energy Star-rated appliances, and the industrial temperature range survives the heat of motor compartments. The USART supports service-diagnostic interface and the ADC reads thermistor inputs.
Được đề xuất
Sensor Interface Modules
The PIC16LC74B-04I/P integrates an 8-channel 8-bit ADC and SPI/I2C ports to consolidate sensor data from multiple sources into a single protocol output. The 33 I/O pins accommodate parallel sensor arrays, while the 192-byte RAM buffers readings before USART transmission. Its industrial -40C to +85C range makes it suitable for HVAC, building automation, and outdoor environmental monitoring. The brown-out reset and watchdog timer protect against sensor glitches and supply noise in industrial environments.
Được đề xuất
Low-Cost Remote Controls
The PIC16LC74B-04I/P's low-power "LC" process and modest 4 MHz clock fit handheld battery-powered remote controls transmitting IR or RF commands. The 33 I/O lines connect to keypad matrices and LED indicators, while the 7 KB OTP memory holds the protocol stack and button mappings. The capture module decodes IR receiver inputs for learning-remote applications. Its industrial temperature range covers outdoor remote use, and the brown-out reset protects against battery-low misoperation.
Được đề xuất
Legacy Embedded Systems
The PIC16LC74B-04I/P continues to support legacy industrial, automotive-aftermarket, and educational designs using the PIC16C mid-range instruction set. Its 4 MHz operation with 200 ns instruction cycle matches the original PIC16C74 timing assumptions in legacy firmware. The 33 I/O pin count preserves backward compatibility with older I/O expansion boards. While NRND status limits new designs, existing production boards benefit from continued limited-stock availability for repair and refurbishment.
Được đề xuất
Educational and Hobby Projects
The PIC16LC74B-04I/P remains popular in university courses and hobby projects teaching mid-range PIC assembly programming and embedded C. Its 35-instruction RISC core, 7 KB OTP memory, and rich peripheral set (ADC, PWM, USART, SPI, I2C) provide a comprehensive learning platform. The 40-pin PDIP package is breadboard-friendly, allowing easy prototyping without fine-pitch soldering. Industrial temperature rating supports classroom lab environments and field demonstration projects.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC74B-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 | PIC16F74-I/P | PIC16C74B-04/P | PIC16C74B-04I/P | PIC16LC74B-04I/PQ |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-PDIP (through-hole) | 40-PDIP (same) | 40-PDIP (same) | 40-PDIP (same) | 44-PQFP (different) |
| Core | 8-bit PIC16C mid-range | 8-bit PIC16F mid-range | 8-bit PIC16C mid-range | 8-bit PIC16C mid-range | 8-bit PIC16C mid-range |
| Program Memory Type | 7 KB OTP | 7 KB Flash | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Maximum Clock | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 4 MHz |
| 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) |
| RAM | 192 B | 192 B | 192 B | 192 B | 192 B |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | NRND | Active | NRND | NRND | NRND |
| Low-Power CMOS Process | Yes (LC variant) | Yes | No (standard CMOS) | No (standard CMOS) | Yes (LC variant) |
Bảo phân biệt quan trọng
- Low-power "LC" process for battery-friendly operation (vsPIC16C74B-04I/P (standard CMOS variant))
- Industrial -40 C to +85 C operating temperature range (vsPIC16C74B-04/P (commercial 0 C to +70 C))
- 33 I/O pins with rich peripheral set (vsPIC16LC73B-04I/P (28 I/O pins))
- 35-instruction RISC core with deterministic timing (vsPIC16F84 (legacy 18-pin flash MCU))
Ghi chú thiết kế
The PIC16LC74B-04I/P uses the low-power "LC" CMOS process, yielding significantly lower quiescent current than the standard PIC16C74B. Estimated: at 4 MHz and 5V supply, active current is approximately 5 mA and standby current below 10 uA with watchdog disabled. Always provide bulk decoupling (10-47 uF) at VDD and a 100 nF ceramic bypass capacitor close to the VDD pin.
Place the 100 nF decoupling capacitor within 5 mm of the VDD pin (pin 27) and connect its ground return directly to VSS (pin 26) to reduce switching noise coupling into the ADC. The OSC1/OSC2 traces should be kept short and routed away from analog inputs to prevent clock noise from corrupting ADC readings. The MCLR/VPP pin requires a 10 kohm pull-up to VDD for normal operation and a series resistor when using ICSP programming.
Do not confuse the PIC16LC74B-04I/P (4 MHz grade) with the PIC16LC74B-20I/P (20 MHz grade) - the -20 variant operates up to 5x faster but requires firmware timing recalculation. The OTP memory can only be programmed once, so verify firmware with a flash-based PIC16F74 prototype before committing to OTP production. The PORTE pins (RE0/RE1/RE2) double as Parallel Slave Port control signals and must be disabled in ADCON1 if used as digital I/O.
At maximum operating frequency (4 MHz) and 5V supply, the PIC16LC74B-04I/P consumes approximately 5 mA active current, dissipating only 25 mW - well within the 40-pin PDIP's thermal envelope. Estimated: at industrial -40C to +85C operating range, no heatsink is required. However, in enclosed appliances near heat sources, derate clock frequency below 4 MHz if junction temperature approaches 100 C.
Thông tin tuân thủ
RoHS compliance status not explicitly stated in verified web data; the 40-pin PDIP through-hole package is commonly produced with lead-containing solder and may require RoHS 7(a) exemption. AEC-Q100 automotive qualification not applicable - PIC16LC74B family is not automotive-grade. Compliance status should be verified per shipment from distributor documentation.
