PIC16LC774/PQ - 8-bit MCU, 7KB OTP, 33 I/O, 20MHz | Microchip
MPN: PIC16LC774/PQ ✗ Cuối đờiPIC16LC774/PQ Tóm tắt
An 8-bit PIC microcontroller is a Harvard-architecture RISC device that executes one instruction per clock cycle (except branches) and uses separate program and data buses. PIC microcontrollers are positioned within the broader semiconductor hierarchy as a sub-class of microcontrollers -> embedded processors -> integrated circuits. The PIC16C/LC mid-range family targets cost-sensitive industrial and consumer applications requiring deterministic real-time control with on-chip analog peripherals. The PIC16LC77x sub-family specifically emphasizes larger I/O counts (up to 33 pins) and analog integration, distinguishing it from lower-pin PIC16C7x predecessors.
Key features include 7KB of OTP program memory, 256 bytes of data RAM, 33 I/O pins with individually programmable direction, an 8-channel 10-bit ADC with sample-and-hold, synchronous/asynchronous USART, MSSP for SPI/I2C, two CCP modules for timing and PWM, and a watchdog timer with on-chip RC oscillator. The MQFP-44 package gives designers a manageable 10x10 mm footprint with gull-wing leads suitable for both reflow soldering and through-hole rework, satisfying industrial-grade PCB thermal needs.
Architecturally, the PIC16LC774 uses a 14-bit instruction word and an 8-bit data path, with hardware stack, 8-level deep, and an interrupt controller supporting up to 14 sources. The LC designation indicates the lower-voltage CMOS process that draws less quiescent current than the PIC16C774 OTP/EPROM equivalent, making the LC variant preferable for battery-powered or thermally constrained designs.
Typical applications include industrial control panels, sensor signal conditioning front-ends, motor control drivers, instrumentation front-ends, and consumer appliances. The 33 I/O count and 10-bit ADC make it a strong fit for distributed I/O nodes and small motor drive controllers.
When designing with this part, note that the OTP variant cannot be reprogrammed, so verify firmware with UV/EPROM-equipped PIC16C774 samples before committing to production volumes. Adequate decoupling (100 nF + 10 uF bulk) near VDD/AVDD pins is critical for ADC accuracy.
This page synthesizes real-time distributor pricing, pin-compatible alternatives, and engineering design notes not found in the standalone datasheet, supplying decision support for sourcing and PCB reuse planning.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC774/PQ — 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 PIC16LC774/PQ (cùng hình factor và footprint) — khác nhau ở Program Memory Type, RAM Size, Supply Voltage Range, ADC, Communication Peripherals.
PIC16F877A-I/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC18F4520-I/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C774-I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC770/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC771/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC65B-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC774/PQ Tỷ lệ tối đa & tính chất điện
| Program Memory Size | 7 KB (4K x 14) |
| Program Memory Type | OTP |
| RAM Size | 256 x 8 bytes |
| Number of I/O Pins | 33 |
| CPU Architecture | 8-bit RISC PIC16 |
| Instruction Word Length | 14-bit |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V |
| ADC | 10-bit, 8 channels |
| Communication Peripherals | USART, SPI, I2C (MSSP) |
| Timers | 3 x 8/16-bit with 8-bit prescaler |
| CCP Modules | 2 (Capture/Compare/PWM) |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Oscillator Type | External (XT, HS, LP, RC modes) |
| Hộp | 44-MQFP (10x10 mm), MQFP-44 |
| Kiểu lắp đặt | Surface Mount |
| Lead Style | Gull Wing |
Cấu hình chân PIC16LC774/PQ
| Chân 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Chân 3 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Chân 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC Vref+ |
| Chân 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 6 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| Chân 7 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 8 | OSC2/CLKOUT — Crystal oscillator output / clock out |
| Chân 9 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator / clock input |
| Chân 10 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator / CCP2 |
| Chân 11 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| Chân 12 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 13 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 14 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 15 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Chân 16 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Chân 17 | GND — Ground (digital) |
| Chân 18 | GND — Ground (digital) |
| Chân 19 | VDD — Positive supply (digital) |
| Chân 20 | VDD — Positive supply (digital) |
| 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 / LVP 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 — PORTD bit 0 |
| Chân 30 | RD1 — PORTD bit 1 |
| Chân 31 | RD2 — PORTD bit 2 |
| Chân 32 | RD3 — PORTD bit 3 |
| Chân 33 | RD4 — PORTD bit 4 |
| Chân 34 | RD5 — PORTD bit 5 |
| Chân 35 | RD6 — PORTD bit 6 |
| Chân 36 | RD7 — PORTD bit 7 |
| Chân 37 | RE0/RD — PORTE bit 0 / Parallel-port read control |
| Chân 38 | RE1/WR — PORTE bit 1 / Parallel-port write control |
| Chân 39 | RE2/CS — PORTE bit 2 / Parallel-port chip select |
| Chân 40 | AVDD — Positive supply (analog) |
| Chân 41 | AVSS — Ground (analog) |
| Chân 42 | VREF+ — ADC positive voltage reference |
| Chân 43 | VREF- — ADC negative voltage reference |
| Chân 44 | MCLR/VPP — Master clear reset / programming voltage |
Ứng dụng tiêu biểu
PIC16LC774/PQ phù hợp cho 6 Áp dụngs: Industrial Control Panels, Sensor Signal Conditioning Front-Ends, Small Motor Drive Controllers, Instrumentation Front-Ends, Consumer Appliance Control, Battery-Powered Remote Sensor Nodes.
Industrial Control Panels
The PIC16LC774/PQ is well suited to industrial control panel applications because its 33 digital I/O pins, 8-channel 10-bit ADC, and 2.5V-5.5V supply range satisfy the typical 24V->5V regulated node that monitors push-buttons, limit switches, and analog transducers. According to the Microchip PIC16C77x datasheet, the device's 5 MIPS throughput at 20 MHz easily handles keypad scanning, debouncing, and PWM-driven indicator or buzzer control in real time. Placed on the panel's main logic board with a 7805 or switching pre-regulator and a 4x4 matrix keypad, the LC774 reads 8 analog sensor inputs while driving relay outputs via discrete transistors. Unlike 32-bit Cortex-M0 alternatives, the 8-bit PIC16 core delivers deterministic interrupt latency under 200 ns, which is critical for safety-rated interlock timing.
Được đề xuất
Sensor Signal Conditioning Front-Ends
The PIC16LC774/PQ excels at sensor signal conditioning front-ends thanks to its 8-channel 10-bit ADC (up to ~22 ksps at 5V), integrated USART, and 256-byte RAM that comfortably holds running averages and filter coefficients. Per the Microchip datasheet, the ADC reference can be tied to an external precision reference such as the MCP1541, giving 1 LSB accuracy for thermocouple, bridge, or strain-gauge front-ends. The PIC16 core's 5 MIPS throughput handles digital filtering (e.g., moving-average of 16 samples) in real time across all 8 channels. Designers typically pair the LC774 with a low-noise op-amp like the MCP6002 for sensor gain stages, then transmit processed data over RS-485 via the USART. The 44-MQFP package exposes enough I/O to multiplex 8 sensors and drive calibration relays without an external I/O expander.
Được đề xuất
Small Motor Drive Controllers
For small motor drive controllers, the PIC16LC774/PQ provides two CCP (Capture/Compare/PWM) modules and three timers that can generate complementary PWM signals for brushed DC or stepper motor control. According to Microchip's PIC16C77x documentation, the PWM resolution is 10-bit at modest PWM frequencies and the 20 MHz clock supports up to ~20 kHz PWM with adequate resolution for low-noise motor commutation. The 33 I/O pins interface directly to MOSFET gate drivers like the TC4427 or to H-bridge ICs via opto-isolated logic. The PIC16's deterministic instruction cycle enables precise dead-time insertion, critical for preventing shoot-through in half-bridge drives. The 44-MQFP package's exposed analog/digital pin split also supports adjacent placement of the LC774 and a current-sense amplifier for closed-loop torque control.
Được đề xuất
Instrumentation Front-Ends
Instrumentation front-ends benefit from the PIC16LC774/PQ's integrated 10-bit ADC, USART, and PIC16 core interrupt-driven architecture that delivers deterministic sampling at fixed intervals. Per the Microchip datasheet, designers commonly use the LC774 for digital panel meters, data loggers, and bench instruments where 8 channels of analog input and 33 I/O pins suffice for user-interface buttons, LCD interfacing, and serial telemetry. The 256-byte RAM accommodates 16-sample moving-average buffers per channel with headroom for calibration constants, and the 7 KB OTP holds table-driven menu state machines. The 44-MQFP footprint supports compact 4-layer PCBs with separate analog and digital ground planes. Unlike higher-end dsPIC33 alternatives, the LC774 keeps bill-of-material cost below USD 2 in volume for cost-sensitive instrumentation.
Được đề xuất
Consumer Appliance Control
The PIC16LC774/PQ suits consumer appliance control (washing machines, dishwashers, microwave ovens, HVAC controllers) because its 33 I/O pins drive segmented LCD multiplexers, keypads, relay banks, and triac-fired heater outputs simultaneously. According to the Microchip PIC16C77x datasheet, the LC774's CCP modules generate zero-crossing detection timing for triac phase-angle control while timers track door switches and water-level sensors. The 2.5V-5.5V operating range tolerates loosely regulated 5V rails typical in appliance SMPS designs. OTP memory is acceptable here because production firmware is fixed at end-of-line programming. The 44-MQFP-44 package's 0.80 mm pitch is compatible with wave-solderable lead finishes used in high-volume appliance manufacturing.
Được đề xuất
Battery-Powered Remote Sensor Nodes
For battery-powered remote sensor nodes, the PIC16LC774/PQ (LC process) offers lower quiescent current than the EPROM-based PIC16C774, making it the preferred choice where sleep-mode power matters. Per Microchip documentation, the LC774 draws microamp-level standby current with the watchdog timer running, supporting multi-year battery life on 2xAA cells when waking periodically to sample sensors. The 8-channel ADC, 256-byte RAM, and USART (configured as UART for command-and-control) fit remote telemetry designs that transmit via a discrete 433 MHz or sub-GHz radio module. The 44-MQFP footprint suits compact 2-layer PCBs where board area is tight. Unlike higher-pin PIC18F alternatives, the LC774 keeps active-mode power well under 10 mA at 5V/20 MHz, important for duty-cycled sensor nodes.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC774/PQ — 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 | PIC16F877A-I/PQ | PIC18F4520-I/PQ | PIC16C774-I/PQ |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Program Memory | 7 KB OTP | 14 KB flash (+100%) | 32 KB flash (+357%) | 7 KB EPROM (UV-erasable) |
| RAM Size | 256 bytes | 368 bytes (+44%) | 1536 bytes (+500%) | 256 bytes (same) |
| Maximum Clock | 20 MHz (5 MIPS) | 20 MHz (5 MIPS) | 40 MHz (10 MIPS, +100%) | 20 MHz (5 MIPS) |
| Operating Voltage | 2.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 6.0 V (narrower) |
| I/O Pins | 33 | 33 (same) | 36 (+9%) | 33 (same) |
| ADC | 10-bit, 8 channels | 10-bit, 8 channels (same) | 10-bit, 13 channels | 10-bit, 8 channels (same) |
| Lifecycle Status | Obsolete | Active | Active | Obsolete (EPROM legacy) |
| Unit Price (qty 1, USD) | ~18.50 | ~6.50 (active volume pricing) | ~7.20 (active volume pricing) | ~16.00 (legacy) |
Bảo phân biệt quan trọng
- Flash reprogrammability on same 44-MQFP-44 footprint (vsPIC16C774-I/PQ (EPROM))
- Higher-performance PIC18 core with same footprint (vsPIC18F4520-I/PQ)
- Lower-voltage 2.5V-5.5V operation (vsPIC16C774-I/PQ)
- Active alternative with full ecosystem support (vsAll obsolete PIC16LC774 family variants)
Ghi chú thiết kế
Decouple VDD/AVDD with a 100 nF ceramic capacitor placed within 5 mm of each supply pin, plus a single 10 uF bulk capacitor on the main VDD rail. The PIC16LC774's ADC reference (VREF+/VREF-) must be tied to low-impedance sources - if VREF+ is shared with AVDD, add a dedicated 10 uF + 100 nF RC network at the AVDD pin to suppress switching noise from digital outputs that would otherwise couple into ADC readings. According to Microchip PIC16C77x datasheet guidelines, VREF- should be tied to AVSS to maximize ADC input range. Estimated: at 20 MHz / 5V, the LC774 draws ~15 mA active; at 4 MHz / 3.3V it draws ~2 mA.
Place a guard ring of ground traces around the analog pins (AN0-AN7, VREF+/VREF-) and use a star-ground topology tying AVSS and VSS at a single point near the LC774. Route the 20 MHz crystal traces (OSC1/OSC2) symmetrically with a continuous ground plane underneath, kept short (<10 mm), and surrounded by grounded guard traces to prevent crosstalk into the ADC. For the 44-MQFP-44 footprint, follow the standard Microchip land pattern with 0.80 mm pitch and 0.30 mm pad width; avoid routing signals under the IC body. Per Microchip application note TB3014, ground-plane splitting under analog sections can reduce ADC noise by 1-2 LSB.
Do not program OTP PIC16LC774 parts before firmware verification - use a PIC16C774 EPROM/UV-erasable sample for code development, or substitute a flash-equipped PIC16F877A-I/PQ. Ensure MCLR/VPP is pulled to VDD through a 10 kohm resistor with a 100 nF cap to ground for proper reset; floating MCLR causes erratic startup. Watchdog timer must be enabled via configuration fuses for safety-critical applications, and unused interrupts should be disabled to prevent spurious vector fetches. The LC774 /PQ suffix does not have automotive qualification - use the '-I' industrial grade (where available) for harsher environments.
Estimated: at 20 MHz and 5V VDD, the PIC16LC774/PQ consumes approximately 75 mW active power (15 mA * 5V), well within the 44-MQFP package's ~1 W thermal limit (theta_JA ~50 C/W on a 2-layer JEDEC test board). At elevated ambient temperatures above 70 C or in enclosed appliances, ensure the 44-MQFP package has at least 100 mm^2 of copper pour on top and bottom layers for heat spreading. The LC process inherently runs cooler than the EPROM PIC16C774 process, but junction temperature should still remain below 125 C derating. No external heatsink needed for typical industrial consumer appliance environments.
Thông tin tuân thủ
PIC16LC774/PQ has unknown RoHS/REACH status - the /PQ package predates widespread RoHS transition and Microchip does not publish compliance data for this obsolete part. Lead-free (Pb-free) is 'yes' based on Microchip MQFP-44 Pb-free assembly standard practice, but full material declaration sheets are unavailable for this EOL part. AEC-Q100 is not applicable - this is a commercial-grade part. For automotive applications, use a Q100-qualified PIC18F variant instead.
