PIC16LC774T/PQ - 8-bit MCU, 7KB OTP, 256 RAM, 33 I/O | Microchip
MPN: PIC16LC774T/PQ ✗ জীবনকালের সমাপ্তিPIC16LC774T/PQ সারাংশ
What is an 8-bit RISC microcontroller? An 8-bit RISC MCU executes a reduced instruction set where most instructions complete in a single clock cycle, giving deterministic timing and high code density for embedded control. The PIC16C/LC family sits at the entry-level of Microchip's mid-range lineup, between the smaller PIC12/PIC14 devices and the higher-pin-count PIC17/PIC18 parts. Its position in the broader semiconductor taxonomy is: microcontroller (MCU) -> 8-bit MCU -> mid-range MCU -> embedded controller -> semiconductor IC. This family is widely used in industrial, consumer, and appliance designs where cost, deterministic interrupt response, and long product life outweigh raw computational throughput.
Key features of the PIC16LC774T/PQ include 35 single-word instructions, four oscillator options including external RC and crystal modes, an internal brown-out reset, a watchdog timer with its own on-chip RC oscillator, in-circuit serial programming (ICSP) capability, and a programmable code protection scheme. The 'LC' suffix denotes the extended low-voltage (2.5 V to 5.5 V) variant, while the 'T' indicates tape-and-reel packaging, and '/PQ' specifies the 44-pin Plastic Quad Flat Pack. Compared with the 5 V-only 'C' parts, the LC variant is preferred for battery-powered or 3.3 V system designs.
Architecturally, the PIC16LC774 uses a Harvard bus layout with separate program and data memory spaces, a 14-bit wide program memory bus, and an 8-bit data bus. The 8-level deep hardware stack and 15 special-function hardware registers underpin its deterministic interrupt handling. Power management is supported via Sleep mode with wake-up on interrupt, and the device is fully static, allowing the clock to be stopped without losing register state.
Typical applications include industrial control panels, HVAC thermostats, instrumentation front-ends, small appliance controllers, security keypads, automotive body electronics (non-safety), and educational or hobby development boards. The 33 I/O pins comfortably drive keypads, character LCDs, and relay or triac interfaces when paired with appropriate buffers.
When designing with this part, allocate the analog and digital I/O banks carefully: pins multiplexed with the A/D converter share a single sample/hold, and placing noisy digital signals adjacent to analog inputs degrades converter noise performance. Always fit decoupling capacitors of 0.1 uF close to VDD/VSS, observe the in-circuit serial programming pinout if the PCB will be programmed in production, and verify that the chosen oscillator mode supports the required instruction cycle timing at the system's lowest operating voltage.
এর জন্য ড্রপ-ইন বিকল্প PIC16LC774T/PQ — একই package, pin-to-pin compatible। ভিন্ন package-এর যেসব পার্টে PCB rework প্রয়োজন সেগুলো বাদ দেওয়া হয়েছে।
PIC16F877T-I/PQ
✅ ড্রপ-ইন📋 রেফারেন্স বিকল্প (ক্যাটালগে নেই)
PIC16F874T-I/PQ
✅ ড্রপ-ইন📋 রেফারেন্স বিকল্প (ক্যাটালগে নেই)
PIC16F877AT-I/PQ
✅ ড্রপ-ইন📋 রেফারেন্স বিকল্প (ক্যাটালগে নেই)
PIC16F887T-I/PQ
✅ ড্রপ-ইন📋 রেফারেন্স বিকল্প (ক্যাটালগে নেই)
PIC16LC774T/PQ সর্বোচ্চ রেটিং ও বৈদ্যুতিক বৈশিষ্ট্য
| Core Architecture | 8-bit PIC16 RISC, Harvard bus |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 256 x 8 bytes |
| Number of I/O Pins | 33 |
| সর্বোচ্চ ক্লক ফ্রিকোয়েন্সি | 20 MHz |
| Instruction Throughput | 5 MIPS (DC to 20 MHz) |
| Supply Voltage Range | 2.5 V to 5.5 V (LC low-voltage family) |
| Instruction Set | 35 single-word instructions |
| Oscillator Type | External (RC / Crystal / Resonator selectable) |
| প্যাকেজ / কেস | 44-pin MQFP (PQ) |
| মাউন্টিং টাইপ | Surface Mount |
| অপারেটিং তাপমাত্রা | 0C to +70C (commercial) |
| Communication Interfaces | USART, SSP/SPI/I2C |
| Watchdog Timer | Yes, with dedicated on-chip RC oscillator |
| Brown-out Reset | Yes, on-chip |
| In-Circuit Serial Programming | Yes (ICSP) |
| Packaging | Tape and Reel (TR) |
| RoHS স্ট্যাটাস | Compliant |
PIC16LC774T/PQ পিন কনফিগারেশন
| পিন 1 | MCLR — Master Clear (reset) input, active low |
| পিন 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| পিন 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| পিন 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| পিন 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC Vref+ |
| পিন 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| পিন 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| পিন 8 | RE0/RD/AN5 — PORTE bit 0 / Parallel slave port read / Analog input 5 |
| পিন 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel slave port write / Analog input 6 |
| পিন 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel slave port chip select / Analog input 7 |
| পিন 11 | VDD — Positive supply voltage |
| পিন 12 | VSS — Ground reference |
| পিন 13 | OSC1/CLKIN — Oscillator input / external clock input |
| পিন 14 | OSC2/CLKOUT — Oscillator output / clock output |
| পিন 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| পিন 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 output |
| পিন 17 | RC2/CCP1 — PORTC bit 2 / CCP1 output |
| পিন 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| পিন 19 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| পিন 20 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| পিন 21 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| পিন 22 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| পিন 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| পিন 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| পিন 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| পিন 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| পিন 27 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| পিন 28 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| পিন 29 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| পিন 30 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| পিন 31 | VSS — Ground reference |
| পিন 32 | VDD — Positive supply voltage |
| পিন 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| পিন 34 | RB1 — PORTB bit 1 |
| পিন 35 | RB2 — PORTB bit 2 |
| পিন 36 | RB3/PGM — PORTB bit 3 / Low-voltage ICSP programming input |
| পিন 37 | RB4 — PORTB bit 4 |
| পিন 38 | RB5 — PORTB bit 5 |
| পিন 39 | RB6/PGC — PORTB bit 6 / ICSP clock |
| পিন 40 | RB7/PGD — PORTB bit 7 / ICSP data |
| পিন 41 | NC — Not connected (per datasheet) |
| পিন 42 | NC — Not connected (per datasheet) |
| পিন 43 | NC — Not connected (per datasheet) |
| পিন 44 | NC — Not connected (per datasheet) |
সাধারণ ব্যবহার
PIC16LC774T/PQ এর জন্য উপযুক্ত 6 অ্যাপ্লিকেশনs: Industrial Control Panels, HVAC Thermostat Controllers, Instrumentation Front-Ends, Small Appliance Controllers, Security Keypad and Access Panels, Educational and Hobby Development Boards.
Industrial Control Panels
The PIC16LC774T/PQ suits industrial control panels where 33 I/O lines can directly drive keypads, character LCDs, optocou-fed relays, and triac interfaces via buffers. Its 20 MHz (5 MIPS) throughput handles keypad scanning, debounce, and protocol parsing in real time. The 7 KB OTP program memory accommodates typical panel firmware including menus and Modbus ASCII, while the extended 2.5-5.5 V LC range tolerates industrial 24 V supply rails after regulation. The on-chip watchdog timer with dedicated RC oscillator detects firmware lock-ups common in electrically noisy environments.
সুপারিশকৃত
HVAC Thermostat Controllers
For HVAC thermostat designs the PIC16LC774T/PQ's on-chip 10-bit-class ADC samples thermistor, humidity, and setpoint potentiometer signals without external converter cost, while the 33 I/O lines drive LCD segments, triac gate drivers, and fan/valve relays. The 2.5-5.5 V LC operation allows direct 3.3 V battery-backed supply, simplifying wall-thermostat power design. Watchdog timer and brown-out reset protect against brown-outs during compressor inrush - critical for field reliability.
সুপারিশকৃত
Instrumentation Front-Ends
Bench and field instrumentation such as digital multimeters and process calibrators benefit from the PIC16LC774T/PQ's deterministic interrupt response and ample 33 I/O for keypad, rotary encoder, and dot-matrix LCD drive. The Harvard architecture and 14-bit-wide program bus deliver predictable execution timing essential for ratiometric measurements and autoranging algorithms. Brown-out reset and watchdog features protect against battery sag in portable instruments.
সুপারিশকৃত
Small Appliance Controllers
Washing machines, microwave ovens, dishwashers, and similar white-goods appliances use the PIC16LC774T/PQ to time motor phases, drive seven-segment displays, and read membrane keypads. The 5 MIPS throughput handles encoder feedback loops for BLDC or universal motor control when paired with an external driver. ICSP enables pre-flash programming at the assembly line while OTP keeps per-unit cost low. The 'LC' voltage range supports single-cell Li-ion or rectified mains-derived 3.3 V rails.
সুপারিশকৃত
Security Keypad and Access Panels
Security keypads, alarm panels, and RFID access controllers use the PIC16LC774T/PQ for matrix keypad scanning, code storage, and tamper detection. The on-chip EEPROM area stores user codes and event logs without an external memory chip. USART communicates with a host controller or GSM module, while the watchdog timer guards against software lock-up during power glitches. Extended 2.5-5.5 V operation tolerates battery-backup transitions in security panels.
সুপারিশকৃত
Educational and Hobby Development Boards
University courses, hobbyist kits, and developer training boards use the PIC16LC774T/PQ to teach 8-bit embedded programming with a generous 33 I/O budget that supports dozens of LEDs, buttons, and peripheral breakout pins. The PIC16 instruction set (35 single-word instructions) is intentionally simple enough for one-week introductory labs, while the 44-pin MQFP package is breadboard-adaptable via carrier PCBs. ICSP allows students to load code from MPLAB X without removing the device.
সুপারিশকৃত
সুপারিশকৃত পণ্যের সারসংক্ষেপ
এর জন্য ইঞ্জিনিয়ারিং রেফারেন্স ডেটা PIC16LC774T/PQ — তুলনা, ডিজাইন গাইডেন্স এবং কমপ্লায়েন্স তথ্য।
নির্বাচন গাইড
বিকল্পের সাথে তুলনা
| পারামিটার | এই পণ্য | PIC16F877T-I/PQ | PIC16F874T-I/PQ | PIC16F877AT-I/PQ | PIC16F887T-I/PQ |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin MQFP (PQ) | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same |
| Program Memory | 7 KB OTP | 7 KB FLASH | 4 KB FLASH | 7 KB FLASH (enhanced) | 7 KB FLASH (enhanced) |
| RAM Size | 256 bytes | 256 bytes | 192 bytes | 256 bytes | 368 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 36 |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Voltage | 2.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Memory Type | OTP (one-time) | FLASH (reprogrammable) | FLASH (reprogrammable) | FLASH (enhanced) | FLASH (enhanced) |
| Lifecycle Status | NRND | Active | Active | Active | Active |
মূল পার্থক্যসমূহ
- Reprogrammable FLASH upgrade path on identical pinout (বনামPIC16LC774T/PQ (this part) vs PIC16F877T-I/PQ)
- Extended low-voltage 2.5 V to 5.5 V LC operation (বনামPIC16LC774T/PQ (LC) vs PIC16C774 (C variant))
- Enhanced successor with larger RAM and more I/O (বনামPIC16LC774T/PQ vs PIC16F887T-I/PQ)
ডিজাইন নোট
Decouple VDD (pins 11 and 32) with a 0.1 uF ceramic capacitor placed within 5 mm of each pin, plus a bulk 10 uF tantalum or aluminum capacitor near the supply entry point. The dual VDD/VSS pin pairs (11/12 and 31/32) mean both supply rails must be decoupled independently to prevent logic errors during high-current digital switching. Tie the MCLR pin (pin 1) to VDD through a 10 kohm resistor and add a reverse-biased diode to VDD if the application requires robust reset behavior during power-down.
Choose the oscillator mode in configuration bits before programming: HS for >4 MHz crystal, XT for 100 kHz-4 MHz, LP for 32 kHz low-power crystals, or RC for cost-sensitive designs. According to Microchip datasheet 30261D, crystal load capacitance values must match the chosen crystal; typical 20 MHz designs use 15-33 pF. For EMI-sensitive applications, keep the crystal traces short and surrounded by a ground guard ring.
Because PIC16LC774T/PQ uses OTP memory, every firmware revision during development requires a new physical part - budget accordingly or use a FLASH PIC16F877T-I/PQ for prototyping. Pin 1 (MCLR) must NOT be left floating - a floating MCLR causes erratic resets from noise. The ADC analog inputs (RA0-RA5, RE0-RE2) share their digital ports; configure them as analog inputs via ADCON1 to disable the digital input buffer and prevent cross-conduction currents that degrade ADC accuracy.
The 44-pin MQFP package has 0.8 mm pin pitch and gull-wing leads that require careful solder paste stencil design. Use a laser-cut stainless steel stencil of 0.1-0.15 mm thickness with apertures slightly smaller than the land pad to prevent solder bridges. Keep analog traces (RA0-RA5, RE0-RE2) physically separated from digital switching traces by at least one trace-width or a ground pour to maintain ADC SNR.
কমপ্লায়েন্স তথ্য
RoHS and lead-free per Microchip product page; halogen-free status not stated in retrieved data. Not AEC-Q100 qualified - choose PIC16F877T-I/PQ with automotive grade suffix for vehicle applications.
