PIC16C65B-20I/L - 8-bit 20MHz OTP MCU, 7KB | Microchip
MPN: PIC16C65B-20I/L ✗ Cuối đờiPIC16C65B-20I/L Tóm tắt
An 8-bit microcontroller (MCU) is a small, self-contained computing device built around an 8-bit data bus, integrating a CPU, program memory, RAM, and peripherals such as timers, communication interfaces, and I/O. The PIC16CXX mid-range family uses a Harvard RISC architecture that executes most instructions in a single 200 ns cycle, making these MCUs cost-effective deterministic controllers for embedded systems that do not require the horsepower of 32-bit cores. The PIC16C65B-20I/L sits in the linear-regulator and motor-control hierarchy as a reliable industrial-grade controller, and it belongs to the broader Power Management and Embedded Control semiconductor ecosystem.
Key features include 35 single-word instructions to learn, all single-cycle except program branches (two cycles), Brown-out Detect/Reset, Power-on Reset (POR), Watchdog Timer (WDT), Pulse Width Modulation (PWM) peripherals, and three timer modules. The OTP program memory means each device can be programmed only once, which suits high-volume production but makes the part effectively obsolete for prototyping or design-iteration workflows. The "L" suffix denotes the lead-bearing PLCC-44 package, while the "I" denotes the industrial -40C to +85C temperature range.
Typical applications include industrial automation controllers, automotive body and chassis electronics, consumer appliance control boards, and legacy embedded systems. The 33 I/O pins comfortably drive LED arrays, keypads, and small relays, while the PWM module supports DC motor speed control and lighting dimming. Its robust peripheral set and wide operating voltage tolerance make it a long-life favorite for harsh-environment industrial designs where flash-based microcontrollers are not required.
When designing with PIC16C65B-20I/L, plan for OTP-only programming - any code change requires a new device, raising development risk. Verify oscillator configuration and decoupling layout per the Microchip mid-range reference manual, and budget a socketed programming adapter since the PLCC-44 form factor is uncommon in modern designs.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet, supporting both legacy maintenance and new BOM decisions as of 2026-09-18.
Bộ thay thế dễ dàng lắp đặt cho PIC16C65B-20I/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 PIC16C65B-20I/L (cùng hình factor và footprint) — khác nhau ở Mounting Type, Program Memory Size, Package, Core Architecture, Program Memory Type.
PIC16C65B-20/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C65B-20I/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C65B-04I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C65B-04E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F877A-20I/L
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C65B-20I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 RISC, 8-bit |
| Instruction Set | 35 single-word instructions |
| Tần số xung maksimum | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM Size | 192 bytes |
| Data EEPROM | Not present |
| Operating Voltage | 5 V nominal |
| Number of I/O Pins | 33 |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT, 3x Timers |
| Khoảng nhiệt độ hoạt động | -40C to +85C (Industrial, "I" grade) |
| Package Type | 44-pin PLCC (16.59 x 16.59 mm) |
| Kiểu lắp đặt | Surface Mount (PLCC socket or solder) |
| Lead Finish | Tin-Lead (PLCC, "L" suffix) |
| Trạng thái RoHS | Non-compliant (SnPb lead finish) |
| Trạng thái vòng đời | NRND (Not Recommended for New Designs) |
Cấu hình chân PIC16C65B-20I/L
| Chân 1 | OSC1/CLKIN — Oscillator input / external clock input |
| Chân 2 | OSC2/CLKOUT — Oscillator output / clock output |
| Chân 3 | MCLR — Master Clear reset input (active low) |
| Chân 4 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 5 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 6 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 7 | RA3/AN3/VREF — Port A bit 3 / Analog input 3 / VREF |
| Chân 8 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Chân 9 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Chân 10 | VSS — Ground |
| Chân 11 | VDD — Positive supply (+5V) |
| Chân 12 | RB0/INT — Port B bit 0 / External interrupt |
| Chân 13 | RB1 — Port B bit 1 |
| Chân 14 | RB2 — Port B bit 2 |
| Chân 15 | RB3 — Port B bit 3 |
| Chân 16 | RB4 — Port B bit 4 |
| Chân 17 | RB5 — Port B bit 5 |
| Chân 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| Chân 19 | RB7/PGD — Port B bit 7 / ICSP data |
| Chân 20 | VSS — Ground |
| Chân 21 | VDD — Positive supply (+5V) |
| Chân 22 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / clock input |
| Chân 23 | RC1/T1OSI — Port C bit 1 / Timer 1 oscillator input |
| Chân 24 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Chân 25 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 26 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 27 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 28 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Chân 29 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Chân 30 | VSS — Ground |
| Chân 31 | VDD — Positive supply (+5V) |
| Chân 32 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| Chân 33 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| Chân 34 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| Chân 35 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| Chân 36 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| Chân 37 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| Chân 38 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| Chân 39 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| Chân 40 | VSS — Ground |
| Chân 41 | VDD — Positive supply (+5V) |
| Chân 42 | RE0/RD/AN5 — Port E bit 0 / Read control / Analog input 5 |
| Chân 43 | RE1/WR/AN6 — Port E bit 1 / Write control / Analog input 6 |
| Chân 44 | RE2/CS/AN7 — Port E bit 2 / Chip select / Analog input 7 |
Ứng dụng tiêu biểu
PIC16C65B-20I/L phù hợp cho 6 Áp dụngs: Industrial Automation Controllers, Automotive Body and Chassis Electronics, Consumer Appliance Control Boards, HVAC and Climate Control Systems, Security and Access Control Panels, Power Supply Monitoring and Sequencing.
Industrial Automation Controllers
The PIC16C65B-20I/L's industrial -40C to +85C temperature grade and 33 I/O pins make it a reliable controller for PLC-style industrial automation boards driving relays, sensors, and small motors. Its 20 MHz RISC core delivers 5 MIPS, enough for PID loops scanning 8-16 analog inputs at modest update rates. The 7 KB OTP memory is sufficient for state-machine control firmware in conveyor, packaging, and pump systems. The PWM module directly drives solenoid valves and DC motor speed references, while Brown-out Detect and Watchdog Timer ensure recovery from brown-out and firmware runaway events typical of factory-floor EMI environments.
Được đề xuất
Automotive Body and Chassis Electronics
Although the PIC16C65B-20I/L is not AEC-Q100 qualified, its industrial temperature range, Brown-out Detect, and Watchdog Timer have made it a legacy choice for non-safety automotive body controllers such as seat-position modules, mirror adjusters, and lighting dimmers. The 33 I/O pins interface directly with H-bridge drivers and LED current sinks, while the PWM peripheral generates smooth dimming waveforms for instrument-panel backlights. Designers targeting AEC-Q100 should migrate to the PIC16F877A-I/L or a modern PIC18 equivalent. The OTP memory suits high-volume sealed-unit production where firmware is locked at the factory and field updates are not required.
Được đề xuất
Consumer Appliance Control Boards
The PIC16C65B-20I/L's 5 V operation, integrated PWM, and 33 I/O are well matched to washing-machine, dishwasher, microwave, and HVAC control boards that require deterministic response without the cost of flash memory. Its 7 KB OTP fits typical appliance state machines (wash cycles, fan ramps, door interlocks) and the Watchdog Timer resets the MCU if firmware locks up. The PIC RISC architecture executes each instruction in 200 ns at 20 MHz, enabling tight timing control of triac-fired heater elements and brushed DC motors. Many legacy appliance designs still ship with this part, though newer models migrate to PIC16F or PIC18 flash families.
Được đề xuất
HVAC and Climate Control Systems
The PIC16C65B-20I/L controls blower-motor speeds, damper actuators, and thermostat displays in residential and light-commercial HVAC systems where its PWM outputs drive MOSFET gate drivers and its 33 I/O connect to keypads, LCD panels, and temperature sensors. The -40C to +85C industrial grade handles unconditioned equipment-room environments, and the Brown-out Detect prevents firmware corruption during compressor inrush. The 7 KB OTP holds lookup tables for multi-stage compressor control and defrost cycles. For systems needing firmware updates via service-tool interface, migrate to the flash-based PIC16F877A-I/L which shares the same PLCC-44 footprint.
Được đề xuất
Security and Access Control Panels
The PIC16C65B-20I/L is a legacy workhorse in burglar-alarm panels, access-control readers, and fire-alarm annunciators where its 33 I/O scan keypads, reed switches, PIR sensors, and siren drivers while the Watchdog Timer ensures recovery from EMI-induced lockups. The 7 KB OTP holds zone-configuration tables and dialer protocols, and Brown-out Detect prevents false alarms during brief power interruptions. The 5 V supply is well matched to legacy wired-security bus topologies. Migration to flash-based PIC16F887-I/L (PLCC-44 compatible) enables field firmware updates for evolving compliance standards.
Được đề xuất
Power Supply Monitoring and Sequencing
The PIC16C65B-20I/L is often deployed as a housekeeping controller in industrial power supplies and UPS systems, where its 33 I/O monitor AC line voltage, battery state-of-charge, fan tachometer, and load current via external ADCs. The PWM peripheral drives status LEDs and audible alarms, while the Watchdog Timer resets the controller if the main loop stalls. Its 20 MHz core runs state-of-charge algorithms and coulomb-counting routines for sealed lead-acid or Li-ion backup batteries. Designers needing higher ADC resolution should pair the MCU with an external 12-bit ADC such as the MCP3208 over SPI, retaining the same PLCC-44 footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C65B-20I/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 | PIC16C65B-20/L | PIC16C65B-20I/PQ | PIC16C65B-04I/L | PIC16F877A-20I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (16.59x16.59 mm) | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same | 44-pin PLCC - same |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 4 MHz (-80%) | 20 MHz |
| Program Memory Type | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB OTP EPROM | 7 KB OTP EPROM | 14 KB Flash (reprogrammable) |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 368 bytes (+92%) |
| Number of I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature Range | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Reprogrammability | OTP (one-time only) | OTP | OTP | OTP | Flash (10K erase/write cycles) |
| Lifecycle Status | NRND | NRND | NRND | NRND | Active |
Bảo phân biệt quan trọng
- Flash reprogrammability and larger RAM (vsPIC16F877A-20I/L)
- Wider industrial temperature range (vsPIC16C65B-20/L)
- Same PLCC-44 footprint, lower clock speed for EMI-sensitive designs (vsPIC16C65B-04I/L)
Ghi chú thiết kế
OTP memory can be programmed only once - any firmware bug requires a new device and incurs full per-unit cost. Develop and debug firmware on a flash-based equivalent such as the PIC16F877A-I/L (same PLCC-44 pinout), then port the validated .hex file to the PIC16C65B-20I/L for production. Confirm oscillator configuration bits, watchdog enable state, and brown-out voltage threshold in a separate PIC16F877A prototype before committing to OTP programming. Use a third-party programmer like the MPLAB PM3 with the appropriate PLCC adapter socket, and verify the device ID and program memory verify cycles before removing the part from the programmer.
Estimated: At 20 MHz clock and 5 V supply with all 33 I/O pins switching at full CMOS load, the PIC16C65B-20I/L dissipates approximately 100-150 mW worst case, well within the PLCC-44 thermal resistance of approximately 50 C/W. Junction temperature rise above 25C ambient is therefore around 5-8C, leaving substantial headroom to the +85C industrial limit. For high-I/O-count designs, derate by ensuring no more than 10-15 mA per pin and avoid sustained simultaneous switching of all outputs, which can spike supply current and trigger Brown-out Reset.
Place a 0.1 uF decoupling capacitor as close as possible to each VDD pin (pins 11, 21, 31, 41) and a bulk 10 uF tantalum or aluminum electrolytic capacitor at the MCU power entry. The PIC16C65B has four VDD and four VSS pins distributed around the package - all must be connected for proper operation. Route the MCLR reset line away from noisy switching traces and add a 10 kohm pull-up to VDD; if using ICSP, include a diode-isolated high-voltage path per Microchip ICSP specification. Use a ground plane under the MCU to reduce EMI susceptibility in motor-drive and relay-switching applications.
Brown-out Detect (BOD) and Watchdog Timer (WDT) configuration bits are often left at factory defaults, which may not match the application's reset behavior. Configure BOD voltage threshold via the CONFIG register to a value just below the minimum operating VDD (typically 4.0 V for 5 V systems) so transient supply dips trigger a clean reset rather than undefined execution. Enable WDT with a postscaler that gives at least 10-20 ms timeout to survive brief EMI bursts in industrial environments, but disable WDT in timing-critical interrupt routines that cannot tolerate reset.
Thông tin tuân thủ
PLCC package uses tin-lead (SnPb) lead finish per the "L" suffix, making the part non-RoHS compliant. For RoHS-compliant designs, consider the PIC16F877A-I/PQ ( PDIP) or PIC16F877A-I/PT (TQFP) lead-free variants. AEC-Q100 qualification is not available for this legacy OTP part; automotive designs should migrate to a qualified PIC16F or PIC18 equivalent. Conflict-mineral compliance per Microchip product declaration.
