PIC16C774T/L - 8-Bit 20MHz OTP MCU 7KB 44-PLCC | Microchip
MPN: PIC16C774T/L ✗ Cuối đờiPIC16C774T/L Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a CPU core, non-volatile program memory, working RAM, and configurable peripherals. PIC16C-series parts sit at the entry of the 8-bit PIC16 family hierarchy, sitting under PIC18 (16-bit opcodes, more peripherals) and above PIC12/PIC14 sub-families. The 16C line uses one-time-programmable EPROM (the 'C' suffix historically denoted CMOS EPROM), giving it permanent, in-circuit-routable code storage with no in-system reprogramming.
Key features include 35 single-word instructions, an external oscillator interface, programmable code protection, a power-on reset (POR), brown-out reset (BOR), watchdog timer (WDT), in-circuit serial programming (ICSP) via two pins, and a wide 4.5V-5.5V supply range typical for legacy industrial embedded systems. The instruction set is upwards-compatible with PIC16C6x/7x/8x devices, allowing code reuse and easy migration to flash-based PIC16F relatives for modern designs.
Technically, the PIC16C774T/L uses a 14-bit-wide instruction word with a RISC-style single-cycle fetch except for branches. Its 12-bit ADC with up to 8 channels suits sensor and instrumentation signal chains, while the three timers (Timer0/1/2) handle event counting, PWM, or real-time interrupts. The 'T' suffix designates Tape & Reel packaging and the 'L' suffix indicates the 44-lead PLCC J-lead package.
Typical applications include industrial control panels, sensor signal conditioning front-ends, legacy instrumentation with RS-232/RS-485 links, building automation controllers, and printed-circuit-board test fixtures. It also fits brown-field replacements in long-life equipment where original OTP firmware must continue to run.
When designing with this part, note that OTP memory cannot be re-flashed; budget a flash-based PIC16F774 or PIC18F equivalent for field updates. Use proper decoupling (100 nF + 10 uF) near VDD/AVDD/VSS pins, and verify ADC reference stability with a 10 uF cap on VREF+.
This page synthesizes distributor pricing, drop-in Microchip alternatives, and PCB-layout notes not found in the original manufacturer datasheet DS30275A, giving engineers a single reference for sourcing decisions.
Bộ thay thế dễ dàng lắp đặt cho PIC16C774T/L — 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 PIC16C774T/L (cùng hình factor và footprint) — khác nhau ở Core Architecture, Package, Program Memory Size, RAM Size, Mounting Type.
PIC16C774T-I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C774-I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C774T-E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C774-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C774/JW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C765-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C774T/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC |
| Core Clock Speed | 20 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 256 x 8 bytes |
| Number of I/O Pins | 33 |
| Number of ADC Channels | 8 |
| ADC Resolution | 12-bit |
| Instruction Execution Time | 200 ns (5 MIPS) |
| Instruction Set Size | 35 single-word instructions |
| Điện áp cung cấp | 4.5 V to 5.5 V |
| Khoảng nhiệt độ hoạt động | 0 C to +70 C (commercial) |
| Oscillator Type | External |
| Connectivity | I2C, SPI, UART/USART |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Hộp / Vỏ | 44-PLCC (16.59 x 16.59 mm) J-Lead |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân PIC16C774T/L
| Chân 1 | RA2/AN2/VREF- — PORTA bit 2 / ADC channel 2 / ADC negative reference |
| Chân 2 | RA3/AN3/VREF+ — PORTA bit 3 / ADC channel 3 / ADC positive reference |
| Chân 3 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Chân 4 | MCLR/VPP — Master clear reset (active low) / programming voltage |
| Chân 5 | RA5/AN4/SS — PORTA bit 5 / ADC channel 4 / SPI slave select |
| Chân 6 | RE0/RD/AN5 — PORTE bit 0 / parallel port read / ADC channel 5 |
| Chân 7 | RE1/WR/AN6 — PORTE bit 1 / parallel port write / ADC channel 6 |
| Chân 8 | RE2/CS/AN7 — PORTE bit 2 / parallel port chip select / ADC channel 7 |
| Chân 9 | OSC1/CLKI — External oscillator crystal input / external clock input |
| Chân 10 | OSC2/CLKO — External oscillator crystal output / clock output |
| Chân 11 | VDD — Positive supply voltage (4.5V to 5.5V) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 14 | RB1 — PORTB bit 1 |
| Chân 15 | RB2 — PORTB bit 2 |
| Chân 16 | RB3/PGM — PORTB bit 3 / low-voltage programming |
| Chân 17 | RB4 — PORTB bit 4 |
| Chân 18 | RB5 — PORTB bit 5 |
| Chân 19 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 20 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 21 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Chân 22 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Chân 23 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Chân 24 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 25 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 26 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 27 | RC6/TX/CK — PORTC bit 6 / UART transmit / USART clock |
| Chân 28 | RC7/RX/DT — PORTC bit 7 / UART receive / USART 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 | RA0/AN0 — PORTA bit 0 / ADC channel 0 |
| Chân 38 | RA1/AN1 — PORTA bit 1 / ADC channel 1 |
| Chân 39 | VSS — Ground reference |
| Chân 40 | VDD — Positive supply voltage (4.5V to 5.5V) |
Ứng dụng tiêu biểu
PIC16C774T/L phù hợp cho 6 Áp dụngs: Industrial Sensor Signal Conditioning, Legacy Instrumentation with RS-232/RS-485 Links, Building Automation Controllers, Brown-Field Replacement for Legacy OTP Firmware, Printed-Circuit-Board Test Fixtures and ATE, Educational and Hobbyist Microcontroller Learning Platforms.
Industrial Sensor Signal Conditioning
The PIC16C774T/L fits industrial sensor signal-conditioning front-ends where its 12-bit 8-channel ADC digitizes 4-20 mA loop signals, thermocouple outputs, and bridge-pressure sensors. Its 33 digital I/O drives relay coils, LED indicators, and opto-isolated digital outputs typical of PLC-adjacent I/O modules. With 7 KB of OTP program memory, designers can implement calibration tables, linearization routines, and HART-like protocol stacks. The 20 MHz core executes 5 MIPS, comfortably handling 100 Hz closed-loop PID cycles. Compared to pure analog front-ends, the MCU enables software-configurable gain, filter coefficients, and alarm thresholds stored in OTP for tamper-proof deployment.
Được đề xuất
Legacy Instrumentation with RS-232/RS-485 Links
The PIC16C774T/L powers legacy instrumentation panels that communicate via UART/USART links to RS-232 or RS-485 transceivers. Its hardware USART handles up to 115200 baud with hardware flow control, suitable for Modbus RTU slave implementations common in factory-floor SCADA nodes. The 256-byte RAM supports a 32-byte Modbus register map and UART receive buffers. The 12-bit ADC captures process measurements (temperature, pressure, flow) with 0.024% resolution (1 LSB of 4096), adequate for most process-control telemetry. Because the OTP memory cannot be re-flashed, deployed firmware is tamper-proof, satisfying field-locked regulatory environments.
Được đề xuất
Building Automation Controllers
The PIC16C774T/L fits building-automation controller nodes for HVAC, lighting, and access-control subsystems where deterministic response time and code immutability are valued. Its three timers generate PWM outputs for damper actuators and dimmer phases; its I2C peripheral drives digital temperature/humidity sensors (e.g., SHT series), and SPI drives LED driver chains or EEPROM for logging. The 35-instruction RISC kernel keeps code density high, allowing complex scheduling logic in 7 KB of OTP. The 44-PLCC SMT package suits compact wall-mount enclosures with constrained PCB area.
Được đề xuất
Brown-Field Replacement for Legacy OTP Firmware
The PIC16C774T/L is the canonical drop-in part for brown-field maintenance of legacy equipment already running PIC16C774 OTP firmware binaries. Re-programming the deployed firmware is impossible (OTP), so any maintenance swap must use the same die. The 'T' tape-and-reel suffix supports SMT assembly lines, while the 'L' 44-PLCC matches original PCB land patterns. The 33 I/O and 12-bit ADC preserve firmware-visible peripheral mapping bit-for-bit, allowing identical hex files to run on the replacement part without re-validation. This is the primary use case in 2026 for the still-active PIC16C774T/L stock.
Được đề xuất
Printed-Circuit-Board Test Fixtures and ATE
The PIC16C774T/L's 33 I/O and 20 MHz throughput make it a competent controller for in-circuit test (ICT) fixtures and automated test equipment (ATE) that exercises UUTs via bed-of-nails interfaces. Its parallel-port-mapped I/O ports (PORTA-PORTE) drive 5 V logic directly, suitable for legacy CMOS/TTL UUT interfaces. The 12-bit ADC digitizes UUT analog responses to within 0.024% LSB precision. Code immutability via OTP prevents unauthorized fixture firmware modification in production environments, preserving test calibration integrity.
Được đề xuất
Educational and Hobbyist Microcontroller Learning Platforms
The PIC16C774T/L retains a niche in educational laboratories and hobbyist projects where students learn PIC assembly language on the canonical 14-bit core. Its 35 single-word instructions are easy to teach by hand, and the 12-bit ADC exercises register-level configuration without abstraction layers. With MPLAB-X and PICkit programmers still supporting legacy PIC16C OTP devices, instructors can demo authentic OTP programming workflows. The 44-PLCC socket-mountable variant fits standard breadboard adapters, and same-family PIC16C773/PIC16C775 variants allow multi-project lab kits.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C774T/L — 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 | PIC16C774T-I/L | PIC16C774T-E/L | PIC16C774-I/P | PIC16C774/JW | PIC16C765-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC (16.59x16.59 mm) - same | 44-PLCC (16.59x16.59 mm) - same | 40-PDIP - different footprint | 40-Ceramic DIP windowed - different footprint | 40-PDIP - different footprint |
| Program Memory | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP (UV-erasable window) | 7 KB (4K x 14) OTP |
| RAM Size | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Core Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| Operating Temperature | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +125 C (extended) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial windowed) | -40 C to +85 C (industrial, USB added) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- 44-PLCC SMT package for high-density assemblies (vsPIC16C774-I/P)
- Industrial temperature grade variant available with identical die (vsPIC16C774T-E/L)
- Broader operating temperature coverage than PIC16C773 family (vsPIC16C773T-I/SO)
Ghi chú thiết kế
Decouple VDD pins (pin 11 and pin 40) with a 100 nF ceramic capacitor in parallel with a 10 uF tantalum or electrolytic capacitor, placed within 5 mm of each VDD pin. AVSS shares pin 39 with VSS but the ADC reference chain is sensitive to digital switching noise - use a separate analog ground island for VREF+/VREF- if precision ADC readings are required.
The PIC16C774T/L is OTP (one-time programmable) - any misprogramming or wrong fuse setting bricks the part permanently. Always verify config-word settings (oscillator selection, watchdog, code-protect, brown-out) with a known-good programmer before mass production. Estimate: programming yield of <1% wrong-config bricks is acceptable, but a batch error is not recoverable.
The 44-PLCC J-lead footprint requires PCB land pads with 0.050 inch (1.27 mm) pitch and exposed pad-to-pad spacing of 16.59 mm. Maintain a continuous ground plane under the IC body for thermal dissipation; the 44-PLCC package dissipates up to 1 W at 20 MHz with all 33 I/O active. Keep the OSC1/OSC2 traces short (<10 mm) and surrounded by ground to minimize EMI coupling into the analog reference chain.
The 12-bit ADC achieves 0.024% resolution (1/4096) but only with a low-impedance reference. The VREF+/VREF- pins (shared with RA3/RA2) must be driven from a low-noise source; a 10 uF + 100 nF capacitor pair at VREF+ is mandatory. Avoid switching high-current signals through RA2-RA5 during ADC conversions - halt ADC and switch ports, or use RBx for digital-only I/O.
Thông tin tuân thủ
RoHS compliant per Microchip product page. PIC16C OTP family is NRND as of 2026; AEC-Q100 grade is not available for PIC16C774 - choose PIC16F874-Q1 for automotive.
