PIC16C65AT-04I/L - 8-Bit OTP MCU 7KB 4MHz PLCC-44 | Microchip
MPN: PIC16C65AT-04I/L ✗ Cuối đờiPIC16C65AT-04I/L Tóm tắt
What is an OTP PIC microcontroller? An OTP (One-Time Programmable) microcontroller uses EPROM-based program memory that can be written only once and then retains the code permanently without a backup battery. Within the broader taxonomy it sits as: microcontroller -> embedded MCU -> 8-bit MCU -> PIC16 family -> PIC16C6X sub-family. The PIC16C65A was the original CMOS EPROM member of the PIC16C6X line, providing RISC performance for embedded industrial designs of the 1990s and early 2000s.
Key features highlighted by the verified distributor data include 33 digital I/O lines, an external oscillator interface, an internal 8-bit timer/counter architecture and synchronous/asynchronous serial port (USART/SCI) capability per the PIC16C6X family specification. The PLCC-44 (16.59 x 16.59 mm, J-lead) format gives robust socket compatibility for legacy through-hole industrial and test-fixture designs where DIP-40 or PLCC-44 sockets are already deployed. The /L suffix indicates the J-lead PLCC-44 package form.
From a technical-depth perspective, the PIC16C65A uses a Harvard-architecture RISC core with separate program and data buses, allowing instruction fetch and data access to occur in parallel. The 14-bit instruction word supports direct, indirect, and relative addressing modes, and the architecture provides hardware stack for subroutine nesting. Power-saving modes include the SLEEP state, and a watchdog timer is available to recover from software lockups in unattended equipment.
Typical applications are industrial automation controllers, instrumentation front-ends, motor-control auxiliary logic, embedded sensor hubs, automotive aftermarket modules, and legacy equipment service replacements where a socketed PLCC-44 PIC must be substituted. Many design teams keep PIC16C65A stock on hand to maintain older field installations.
Design consideration: because the device is OTP, code must be fully verified before programming — there is no in-system reprogram path. For new designs the PIC16F877A (Flash-based) is the modern recommended migration, while the PLCC-44 socket footprint keeps PIC16C65AT-04I/L a true drop-in for legacy boards.
This page combines distributor pricing, verified PIC16C65A family specs, drop-in alternatives, and practical design notes not consolidated in any single manufacturer document.
Bộ thay thế dễ dàng lắp đặt cho PIC16C65AT-04I/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 PIC16C65AT-04I/L (cùng hình factor và footprint) — khác nhau ở Program Memory Size, Program Memory Type, Core Architecture, Package, Timers.
PIC16C65A-04I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C65AT-04E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C65A-04E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C65A-04/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C65BT-04E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C65AT-04I/L Tỷ lệ tối đa & tính chất điện
| Core | PIC16 8-bit RISC |
| Series | PIC16C6X (PIC16C65A) |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 x 8 bytes |
| CPU Speed | 4 MHz |
| Điện áp cung cấp | 5 V |
| Number of I/O | 33 |
| Hộp | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Oscillator Type | External |
| Operating Temperature Grade | Industrial (-40C to +85C) |
| Packaging | Tape & Reel (TR) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | unknown (legacy EPROM part, often non-RoHS) |
| Lead-Free | unknown |
| Instruction Word Width | 14 bits |
| Instruction Set | 35 single-word instructions |
| Data EEPROM | None (OTP program memory only) |
| Number of Terminals | 44 |
| Terminal Form | J-BEND |
| Package Code | QCCJ |
Cấu hình chân PIC16C65AT-04I/L
| Chân 1 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Chân 2 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Chân 3 | RA2/AN2/VREF- — PORTA bit 2 / Analog input 2 / Negative voltage reference |
| Chân 4 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / Positive voltage reference |
| Chân 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input (open-drain) |
| Chân 6 | RA5/SS/AN4 — PORTA bit 5 / Slave Select for SPI / Analog input 4 |
| Chân 7 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| Chân 8 | OSC2/CLKOUT — Oscillator crystal output / clock out (Fosc/4) |
| Chân 9 | MCLR — Master Clear reset input (active low) |
| Chân 10 | VSS — Ground reference |
| Chân 11 | VDD — Positive supply (5V nominal) |
| Chân 12 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 13 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / Capture/Compare/PWM 2 |
| Chân 14 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Chân 15 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Chân 16 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Chân 17 | RC5/SDO — PORTC bit 5 / SPI data out |
| Chân 18 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Chân 19 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Chân 20 | VSS — Ground reference |
| Chân 21 | VDD — Positive supply (5V nominal) |
| Chân 22 | RB0/INT — PORTB bit 0 / External interrupt input |
| Chân 23 | RB1 — PORTB bit 1 |
| Chân 24 | RB2 — PORTB bit 2 |
| Chân 25 | RB3 — PORTB bit 3 |
| Chân 26 | RB4 — PORTB bit 4 |
| Chân 27 | RB5 — PORTB bit 5 |
| Chân 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Chân 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| Chân 30 | VSS — Ground reference |
| Chân 31 | VDD — Positive supply (5V nominal) |
| Chân 32 | RD0 — PORTD bit 0 |
| Chân 33 | RD1 — PORTD bit 1 |
| Chân 34 | RD2 — PORTD bit 2 |
| Chân 35 | RD3 — PORTD bit 3 |
| Chân 36 | RD4 — PORTD bit 4 |
| Chân 37 | RD5 — PORTD bit 5 |
| Chân 38 | RD6 — PORTD bit 6 |
| Chân 39 | RD7 — PORTD bit 7 |
| Chân 40 | VSS — Ground reference |
| Chân 41 | VDD — Positive supply (5V nominal) |
| Chân 42 | RE0/RD — PORTE bit 0 / Read control for parallel slave port |
| Chân 43 | RE1/WR — PORTE bit 1 / Write control for parallel slave port |
| Chân 44 | RE2/CS — PORTE bit 2 / Chip select for parallel slave port |
Ứng dụng tiêu biểu
PIC16C65AT-04I/L phù hợp cho 7 Áp dụngs: Industrial Automation Controllers, Legacy Test & Measurement Instrumentation, Automotive Aftermarket Modules, Embedded Sensor Hubs, Motor Control Auxiliary Logic, Service Replacement Stock for Obsolete Designs, Educational and Training Platforms.
Industrial Automation Controllers
The PIC16C65AT-04I/L's 7 KB OTP program memory and 33 digital I/O lines suit industrial PLC-style controllers where deterministic RISC execution and socketed PLCC-44 maintenance are valued. Its -40C to +85C industrial temperature grade ensures reliable operation in factory-floor enclosures. The 4 MHz clock drives 35 single-word instructions in a single cycle, providing predictable loop timing for relay, solenoid, and sensor I/O control. Engineers use it to manage conveyor logic, machine-tool interlocks, and process-control sub-systems where long-term firmware stability outweighs the need for in-field reprogramming.
Được đề xuất
Legacy Test & Measurement Instrumentation
Test equipment manufacturers built thousands of instruments around the PIC16C65A OTP microcontroller in the late 1990s, and many of those instruments remain in service today. The PIC16C65AT-04I/L drops directly into the original PLCC-44 socket, restoring functionality without PCB redesign. Its 192 bytes of RAM and 7 KB code space support calibration routines, range-switching logic, and front-panel button-matrix scanning. Service technicians keep this part on hand because the OTP memory preserves calibration constants and avoids accidental firmware tampering during repair.
Được đề xuất
Automotive Aftermarket Modules
Automotive aftermarket products (alarm systems, engine tuners, gauge drivers, and lighting controllers) frequently used the PIC16C65AT-04I/L for its robust I/O count and industrial temperature grade. The 33 I/O pins interface with switches, relays, LEDs, and CAN/LIN transceivers in older vehicles. While not AEC-Q100 qualified (it predates that standard for this part), the -40C to +85C range covers under-dash and engine-bay conditions with adequate thermal margin. The OTP memory prevents inadvertent code modification in harsh environments.
Được đề xuất
Embedded Sensor Hubs
The PIC16C65AT-04I/L is well-matched to sensor-hub nodes aggregating thermocouple, strain-gauge, or 4-20 mA inputs in industrial networks. Its USART/SCI peripheral enables RS-232 or RS-485 networking back to a master controller, while 33 I/O lines drive multiplexer select lines and signal-conditioning switches. The 7 KB code space accommodates linearization tables for thermocouples and RTDs. Designers appreciate the deterministic interrupt response and the absence of operating-system overhead in such embedded sensor nodes.
Được đề xuất
Motor Control Auxiliary Logic
Stepper, BLDC, and DC-motor controllers use the PIC16C65AT-04I/L as auxiliary logic for direction, enable, fault detection, and communication, while a dedicated motor-driver IC handles the power stage. The PIC's 4 MHz CPU and single-cycle instruction execution deliver tight timing for quadrature decoding and PWM generation in supervisory loops. The OTP memory locks down safety-related firmware so it cannot be tampered with. Industrial temperature operation ensures reliability in motor enclosures.
Được đề xuất
Service Replacement Stock for Obsolete Designs
Many OEMs and contract manufacturers maintain safety stock of the PIC16C65AT-04I/L specifically to support field-installed equipment that must remain operational for 15-20 year service lifetimes. The OTP nature guarantees firmware integrity over decades, and the PLCC-44 socket allows quick field swap without desoldering. Brokers and franchised distributors still carry inventory of this part, and the part is widely listed on Octopart, DigiKey, and Mouser legacy catalogues. For new designs, engineers should migrate to PIC16F877A-I/L, but for service stock this is the canonical part.
Được đề xuất
Educational and Training Platforms
Universities and technical colleges continue to use the PIC16C65AT-04I/L in embedded-systems curricula because the PLCC-44 socket allows students to repeatedly insert and remove the part during lab exercises without PCB wear. The 7 KB code space, 35-instruction RISC core, and 33 I/O pins offer a tractable platform for teaching assembly language, timer/counter programming, and interrupt-driven design. The OTP memory teaches students the discipline of single-shot programming and firmware validation before commit.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C65AT-04I/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 | PIC16C65A-04I/L | PIC16C65AT-04E/L | PIC16C65A-04E/L | PIC16C65A-04/L | PIC16C65BT-04E/L |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) |
| RAM | 192 x 8 bytes | 192 x 8 bytes | 192 x 8 bytes | 192 x 8 bytes | 192 x 8 bytes | 192 x 8 bytes |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Extended -40C to +125C | Extended -40C to +125C | Commercial 0C to +70C | Extended -40C to +125C |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 |
| Silicon Revision | PIC16C65A (rev A) | PIC16C65A (rev A) | PIC16C65A (rev A) | PIC16C65A (rev A) | PIC16C65A (rev A) | PIC16C65B (rev B) |
| Packaging Format | Tape & Reel (TR) | Tube | Tape & Reel | Tube | Tube | Tape & Reel |
Bảo phân biệt quan trọng
- Tape & Reel format optimized for high-volume SMT assembly (vsPIC16C65A-04I/L)
- Industrial temperature range covering factory-floor environments (vsPIC16C65A-04/L)
- Wide authorized distributor availability for legacy support (vsPIC16C65BT-04E/L)
Ghi chú thiết kế
PIC16C65AT-04I/L operates from a single 5V supply. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin (pins 11, 21, 31, 41) and a bulk 10 uF tantalum or aluminum electrolytic capacitor at the board's power-entry point. The PIC16C6X family datasheet recommends keeping VDD rise time below a few milliseconds to ensure proper Power-On Reset; an RC delay on MCLR or a reset supervisor IC may be needed in slow-ramp supplies. All four VDD pins must be connected, and all four VSS pins must be tied to ground.
Because the PIC16C65AT-04I/L is OTP (one-time programmable), every firmware build burned into a part is permanent. Design teams must validate code in a windowed EPROM emulator (e.g. PIC16C65A with JW package) or in-circuit emulation (ICE 2000) before committing production units. Never use production OTP parts for engineering bring-up. A common pitfall is burning configuration bits (watchdog, oscillator, code protect) incorrectly, which can lock the engineer out of the device — always double-check CONFIG word settings before programming.
Place the 4 MHz crystal or ceramic resonator as close as possible to OSC1 (pin 7) and OSC2 (pin 8), with short traces and a ground pour underneath. Add 22-33 pF loading capacitors (C1, C2) from each oscillator pin to ground. Keep high-frequency digital traces (PORTD bus, USART lines) away from the oscillator loop. The PLCC-44 socket should be a low-profile machined-pin type with gold-plated contacts for reliable insertion cycles in service-replacement scenarios.
Thông tin tuân thủ
PIC16C65AT-04I/L is a legacy OTP EPROM part from the 1990s; explicit RoHS, REACH and halogen-free declarations were not in the verified web data. The PIC16C6X family is generally not AEC-Q100 qualified, so this part is not recommended for safety-critical automotive applications. Verify compliance with the Microchip product page or PCN documents before designing in for new programs.
