PIC16LC74B-04/P - 8-Bit 4MHz 7KB OTP MCU | Microchip Technology
MPN: PIC16LC74B-04/P ✗ Cuối đờiPIC16LC74B-04/P Tóm tắt
An 8-bit microcontroller (MCU) is a compact, single-chip computer built around an 8-bit data bus, integrating CPU core, program memory, data RAM, I/O peripherals, and timers onto one silicon die. PIC microcontrollers from the mid-range PIC16CXX family occupy the position of microcontrollers -> 8-bit MCU -> embedded controller -> semiconductor IC in the broader component taxonomy. Low-power (LC) variants such as the PIC16LC74B reduce supply current compared to standard PIC16C parts, extending battery life in portable and industrial designs.
Key features of the PIC16LC74B-04/P include 4K x 14 words of OTP program memory, 192 x 8 bytes of RAM, interrupt capability with up to 12 internal/external sources, and a fully-static CMOS design that allows DC to 4 MHz operation for the -04 speed grade. The 33 I/O pins individually support input or output direction, and integrated peripherals typically include timers, a USART, an SSP, and an 8-bit ADC depending on the PIC16CXX family variant. The 40-pin PDIP package is through-hole mounted for easy prototyping, breadboarding, and legacy system retrofits.
The PIC16LC74B architecture uses a Harvard-style memory map separating program (14-bit wide instruction words) and data spaces, which enables single-cycle instruction fetch except for program branches that require two cycles. This RISC-based approach simplifies coding while still providing deterministic timing for real-time control loops. Designers familiar with PIC mid-range assembly or C compilers such as XC8 can target the part with minimal learning curve.
Typical applications include industrial automation controllers, sensor interface modules, consumer white goods, low-power battery instruments, and educational embedded platforms where through-hole packages simplify repair and rework. The OTP memory makes the part suitable for mature, fixed-function designs where firmware will not require in-field updates.
When designing with the PIC16LC74B-04/P, confirm the oscillator configuration (RC, XT, LP, HS) matches the chosen crystal or resonator, and observe the maximum clock input of 20 MHz for the -04 speed grade (4 MHz maximum CPU clock). The OTP device cannot be reprogrammed, so production programming via a Microchip device programmer is mandatory before PCB assembly.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC74B-04/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-04/P (cùng hình factor và footprint) — khác nhau ở Mounting Type, Package, A/D Converter, Architecture, Core.
PIC16LC74B-04I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74B-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC73B-04/SP
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC74B-04/P Tỷ lệ tối đa & tính chất điện
| Product Family | PIC16CXX Mid-Range 8-bit MCU |
| Core | 8-bit RISC CPU |
| Instruction Set | 35 single-word instructions |
| CPU Speed (Max) | 4 MHz (DC to 4 MHz for -04 speed grade) |
| Clock Input (Max) | 20 MHz |
| Instruction Cycle | 200 ns at 20 MHz input |
| Program Memory | 7 KB (4K x 14 words) OTP |
| Data Memory (RAM) | 192 x 8 bytes |
| I/O Pins | 33 |
| Hộp | 40-pin PDIP (DIP-40) |
| Kiểu lắp đặt | Through-Hole |
| Temperature Grade | Commercial |
| Architecture | Harvard, fully-static CMOS |
| Interrupt Sources | Up to 12 internal/external |
Cấu hình chân PIC16LC74B-04/P
| Chân 1 | MCLR/VPP — Master Clear (reset) input or programming voltage |
| Chân 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Chân 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Chân 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| Chân 5 | RA3/AN3/VREF — Port A bit 3 / analog input 3 / voltage reference |
| Chân 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4 — Port A bit 5 / analog input 4 |
| Chân 8 | OSC1/CLKIN — Oscillator input / external clock |
| Chân 9 | OSC2/CLKOUT — Oscillator output |
| Chân 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator out / Timer1 clock |
| Chân 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator in / CCP2 |
| Chân 12 | RC2/CCP1 — Port C bit 2 / CCP1 |
| Chân 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 14 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 15 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 16 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Chân 17 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Chân 18 | RD0 — Port D bit 0 |
| Chân 19 | RD1 — Port D bit 1 |
| Chân 20 | RD2 — Port D bit 2 |
| Chân 21 | RD3 — Port D bit 3 |
| Chân 22 | RD4 — Port D bit 4 |
| Chân 23 | RD5 — Port D bit 5 |
| Chân 24 | RD6 — Port D bit 6 |
| Chân 25 | RD7 — Port D bit 7 |
| Chân 26 | RE0/RD — Port E bit 0 / read control |
| Chân 27 | RE1/WR — Port E bit 1 / write control |
| Chân 28 | RE2/CS — Port E bit 2 / chip select |
| Chân 29 | VSS — Ground reference |
| Chân 30 | VDD — Positive supply voltage |
| Chân 31 | OSC1 — Oscillator input (secondary) |
| Chân 32 | OSC2 — Oscillator output (secondary) |
| Chân 33 | RB0/INT — Port B bit 0 / external interrupt |
| Chân 34 | RB1 — Port B bit 1 |
| Chân 35 | RB2 — Port B bit 2 |
| Chân 36 | RB3 — Port B bit 3 |
| Chân 37 | RB4 — Port B bit 4 |
| Chân 38 | RB5 — Port B bit 5 |
| Chân 39 | RB6 — Port B bit 6 |
| Chân 40 | RB7 — Port B bit 7 |
Ứng dụng tiêu biểu
PIC16LC74B-04/P phù hợp cho 6 Áp dụngs: Industrial Automation Controller, Sensor Interface Module, Consumer White Goods Control, Low-Power Battery Instrument, Educational Embedded Platform, Legacy Through-Hole Retrofit.
Industrial Automation Controller
The PIC16LC74B-04/P fits industrial automation controllers because its 33 I/O pins directly drive relays, sensors, and displays, and its 4 MHz CPU with 200 ns instruction cycle handles discrete logic loops in real time. Per Microchip application notes, the Harvard architecture delivers deterministic timing for PID-style control loops, while 192-byte RAM supports small state machines. The 40-pin PDIP through-hole package simplifies field replacement in legacy control panels where technicians need to swap chips with standard extraction tools.
Được đề xuất
Sensor Interface Module
Sensor interface modules use the PIC16LC74B-04/P to read analog and digital sensors and convert measurements to digital outputs. The 33 I/O pins connect directly to switches, thermistors, and serial sensor chips, while the integrated ADC and USART peripherals handle signal conditioning. Per the PIC16CXX datasheet, the LC (low-power CMOS) process reduces quiescent current to extend battery life in remote sensor nodes, and the 7 KB OTP program memory stores fixed calibration tables for production runs.
Được đề xuất
Consumer White Goods Control
Consumer white goods such as washing machines, dishwashers, and microwave ovens historically use the PIC16LC74B-04/P for appliance control boards. The 4 MHz CPU plus 33 I/O pins drive motor triacs, keypad scanning, and LED/LCD indicators, while the OTP memory locks firmware to prevent field tampering. The commercial 0C to +70C temperature grade covers typical indoor appliance environments, and the 40-pin PDIP package fits the through-hole assembly processes of mature appliance production lines.
Được đề xuất
Low-Power Battery Instrument
Battery-powered instruments such as portable data loggers, handheld meters, and remote telemetry units benefit from the PIC16LC74B-04/P's LC low-power CMOS process. The device draws reduced quiescent current compared to standard PIC16C parts, and its fully-static core allows the clock to be stopped in sleep mode for months-long battery life. The 192-byte RAM holds sensor buffers between wake cycles, and the 33 I/O pins interface directly to battery-monitoring circuits and low-power transceivers.
Được đề xuất
Educational Embedded Platform
The PIC16LC74B-04/P is widely deployed in university embedded systems labs and hobbyist electronics courses. The PIC mid-range architecture has 35 single-word instructions that are simple to teach in assembly, and the 7 KB OTP memory is large enough for substantial student projects while small enough to be fully understood. The 40-pin PDIP package is breadboard-friendly, allowing students to insert the chip directly into solderless breadboards without surface-mount soldering skills.
Được đề xuất
Legacy Through-Hole Retrofit
Through-hole retrofits for legacy industrial and military equipment commonly use the PIC16LC74B-04/P because it preserves the original DIP-40 footprint. Per Microchip longevity programs, PIC16CXX devices remain available long after surface-mount equivalents have cycled, allowing field repair of equipment with no PCB rework. The 7 KB OTP memory also matches the original firmware patterns of vintage designs without requiring code porting.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC74B-04/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 | PIC16LC74B-04I/P | PIC16C74B-04/P | PIC16LC73B-04/SP |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | PDIP-40 (DIP-40) | PDIP-40 (same) | PDIP-40 (same) | SPDIP-40 (same footprint) |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 22 |
| Temperature Range | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| Power Variant | LC (low-power CMOS) | LC (low-power CMOS) | Standard C (higher Icc) | LC (low-power CMOS) |
Bảo phân biệt quan trọng
- Low-power LC process for portable applications (vsPIC16C74B-04/P)
- Industrial temperature variant available on same footprint (vsPIC16LC74B-04I/P)
- 33 I/O pins vs 22 on smaller PIC16C73 (vsPIC16LC73B-04/SP)
Ghi chú thiết kế
The PIC16LC74B-04/P belongs to the LC (low-power CMOS) family and supports a wide 2.5V to 5.5V supply range. Estimated: at 5V VDD and 4 MHz CPU clock, typical Icc is in the 2-5 mA range; in sleep mode the device draws under 1 uA, making it suitable for battery-powered designs. Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of the VDD pin.
Route the oscillator traces (OSC1/OSC2 or pins 31-32 on the 40-pin DIP) as short as possible and keep them away from high-current traces to reduce EMI coupling. Per Microchip mid-range design notes, place the crystal or resonator within 10 mm of the MCU and provide a ground guard ring around the oscillator area on 2-layer boards.
Critical: the PIC16LC74B-04/P uses OTP memory which cannot be erased or rewritten. Production programmers must verify firmware before device programming because failed units are scrap. Also confirm the MCLR pin (pin 1) has a proper pull-up resistor (typically 10 kOhm) and is not left floating, otherwise the device will randomly enter reset state at power-up.
Thông tin tuân thủ
RoHS and lead-free status not in the Verified Web Data; consult the manufacturer product page for definitive values. AEC-Q100 not applicable to commercial-temperature MCU. Conflict-mineral compliance per Microchip corporate policy.
