PIC17C44-33I/PQ - 16KB OTP 8-bit MCU, 33MHz, 44-QFP | Microchip
MPN: PIC17C44-33I/PQ ✗ Cuối đờiPIC17C44-33I/PQ Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data RAM, and peripherals. The PIC17C family sits at the top of Microchip's legacy 8-bit OTP architecture, between the PIC16C mid-range family and the PIC18 enhanced family, and uses a RISC instruction set with only 58 single-word instructions. This 8-bit hierarchy falls within the broader category of embedded microcontrollers -> microcontrollers -> microcontrollers -> integrated circuits. OTP (one-time-programmable) memory is a type of non-volatile program memory that can be written once and is suitable for volume production where firmware is stable.
Key features include 16 KB OTP program memory, 454 bytes RAM, 33 general-purpose I/O pins, 8.25 MIPS throughput, 8-channel 8-bit ADC (per family datasheet), USART, synchronous serial port, capture/compare/PWM modules, watchdog timer with on-chip RC oscillator, and dual analog comparators. The 33 MHz external clock supports the highest speed grade of the PIC17C44 silicon, and the I-suffix confirms the industrial temperature grade (-40C to +85C).
Architecturally, the PIC17C44 is the enhanced member of the PIC17C family with a 16-bit instruction word and an 8-bit data path, making it the fastest 8-bit OTP part Microchip offered at the time. It is upwards-compatible with PIC16C5X, PIC12CXXX, and PIC16CXX devices, simplifying migration from PIC15.x. The PQ suffix denotes a 44-pin plastic QFP.
Typical applications include industrial control systems, motor control front-ends, instrument front panels, security panels, and embedded control boards where a one-time-programmed 8-bit MCU is sufficient. Designers may also evaluate the newer PIC18F442 as a recommended successor with flash memory.
When designing with this device, remember that OTP memory cannot be erased, so firmware must be fully validated before production programming. Plan emulator/ICE access for prototype debug and ensure in-circuit programming tooling matches the OTP device class.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers and buyers a single source for evaluation.
Bộ thay thế dễ dàng lắp đặt cho PIC17C44-33I/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 PIC17C44-33I/PQ (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Type, Maximum Clock Frequency, Program Memory Size, Operating Temperature Range.
PIC17C44-33I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C44-25I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C44-33/PQ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC17C44-16I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C43-33I/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44-25I/PT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44-33I/PQ Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC |
| Family | PIC17C Series |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 16 KB (8 K x 16 words) |
| RAM Size | 454 bytes |
| Tần số xung maksimum | 33 MHz |
| Instruction Throughput | 8.25 MIPS (121 ns/instruction) |
| Điện áp cung cấp hoạt động | 5 V |
| Number of I/O Pins | 33 |
| Hộp | 44-QFP (PQ) |
| Package Type | Plastic Quad Flat Pack, Gull-Wing |
| Số chân | 44 |
| Temperature Grade | Industrial (I) |
| Khoảng nhiệt độ hoạt động | -40C to +85C |
| Kiểu lắp đặt | Surface Mount |
| Bề rộng đường dữ liệu | 8-bit (external 16-bit option) |
Cấu hình chân PIC17C44-33I/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 / VREF |
| Chân 5 | RA4/AN4 — PORTA bit 4 / analog input 4 |
| Chân 6 | RA5/AN5 — PORTA bit 5 / analog input 5 |
| Chân 7 | OSC1 — Crystal oscillator input |
| Chân 8 | OSC2 — Crystal oscillator output |
| Chân 9 | MCLR — Master clear reset (active low) |
| Chân 10 | VSS — Ground |
| Chân 11 | VDD — Positive supply (5V) |
| Chân 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Chân 13 | RB1 — PORTB bit 1 |
| Chân 14 | RB2 — PORTB bit 2 |
| Chân 15 | RB3 — PORTB bit 3 |
| Chân 16 | RB4 — PORTB bit 4 |
| Chân 17 | RB5 — PORTB bit 5 |
| Chân 18 | RB6 — PORTB bit 6 |
| Chân 19 | RB7 — PORTB bit 7 |
| Chân 20 | RC0 — PORTC bit 0 |
| Chân 21 | RC1 — PORTC bit 1 |
| Chân 22 | RC2 — PORTC bit 2 |
| Chân 23 | RC3 — PORTC bit 3 |
| Chân 24 | RC4 — PORTC bit 4 |
| Chân 25 | RC5 — PORTC bit 5 |
| Chân 26 | RC6 — PORTC bit 6 |
| Chân 27 | RC7 — PORTC bit 7 |
| Chân 28 | RD0 — PORTD bit 0 |
| Chân 29 | RD1 — PORTD bit 1 |
| Chân 30 | RD2 — PORTD bit 2 |
| Chân 31 | RD3 — PORTD bit 3 |
| Chân 32 | RD4 — PORTD bit 4 |
| Chân 33 | RD5 — PORTD bit 5 |
| Chân 34 | RD6 — PORTD bit 6 |
| Chân 35 | RD7 — PORTD bit 7 |
| Chân 36 | RE0/AN6 — PORTE bit 0 / analog input 6 |
| Chân 37 | RE1/AN7 — PORTE bit 1 / analog input 7 |
| Chân 38 | RE2 — PORTE bit 2 |
| Chân 39 | VSS — Ground |
| Chân 40 | VDD — Positive supply (5V) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
PIC17C44-33I/PQ phù hợp cho 6 Áp dụngs: Industrial Control Systems, Motor Control Front-End, Instrument Front Panels, Security and Access Panels, Embedded Control Boards, Legacy Industrial Printer Controllers.
Industrial Control Systems
The PIC17C44-33I/PQ is well-suited to industrial control panels and PLC front-ends where its 33 MHz clock, 16 KB OTP program memory, and 33 I/O pins provide ample throughput for sequential control loops. Its industrial temperature grade (-40C to +85C) covers factory-floor ambient conditions. The 8.25 MIPS throughput handles PWM-driven motor control and ADC-based sensor sampling in real time without external logic. The OTP memory locks firmware at production, eliminating field reprogramming concerns for fixed-function controllers. Designers can use the USART and synchronous serial port to interface with operator panels, sensors, and host PLCs. This part is widely used in legacy industrial machines where the design has already been qualified and re-validation cost is high.
Được đề xuất
Motor Control Front-End
For motor control front-end circuits driving DC brushed or small stepper motors, the PIC17C44-33I/PQ offers 33 I/O lines, capture/compare/PWM modules, and 8.25 MIPS throughput. The PWM outputs drive H-bridge MOSFETs with deterministic timing from the 33 MHz clock, while capture inputs decode quadrature encoders. The 454-byte RAM supports small PID control loops and command buffers. The industrial temperature range handles under-hood or cabinet environments. OTP firmware locks the motor profile to prevent field tampering. Production designs in this category should plan ahead for migration to PIC18F or dsPIC parts once OTP stock is exhausted.
Được đề xuất
Instrument Front Panels
Test and measurement instruments such as bench multimeters, oscilloscope front-ends, and bench power supplies can use the PIC17C44-33I/PQ to handle keypad scanning, LCD driving, and rotary encoder input via its 33 I/O pins. The 16 KB OTP holds the entire UI state machine and calibration routines. The USART links to the main measurement DSP or ASIC for data exchange. Industrial temperature grade ensures stable operation in laboratory and field environments. OTP memory locks calibration coefficients and prevents accidental firmware corruption in production. Designers should plan for external EEPROM or flash for user-saved settings since the OTP cannot be rewritten in field.
Được đề xuất
Security and Access Panels
Security alarm panels, access controllers, and keypad entry systems commonly use the PIC17C44-33I/PQ because the OTP memory prevents firmware tampering once programmed, a key requirement for security applications. The 33 I/O pins drive keypads, LEDs, relays, sirens, and tamper switches, while the 454-byte RAM buffers event logs. The industrial temperature grade handles outdoor enclosures and unheated wiring closets. The 33 MHz core executes AES or custom encryption routines on local data before transmission. Microchip's mature PIC17C family has decades of field-proven reliability in this segment. For new designs, migrate to PIC18F flash parts to enable firmware updates.
Được đề xuất
Embedded Control Boards
Custom embedded control boards in vending machines, HVAC controllers, and appliance subsystems frequently use the PIC17C44-33I/PQ as a low-cost general-purpose MCU. The 16 KB OTP holds the application state machine, 33 I/O lines connect to sensors, relays, displays, and communication transceivers, and the 33 MHz clock keeps response times predictable. The PIC17C architecture supports C and assembly development, and legacy codebases can be reused without porting. OTP memory prevents post-production firmware theft, important for competitive consumer markets. Modern successors are PIC18F and dsPIC families with more memory and flash storage.
Được đề xuất
Legacy Industrial Printer Controllers
Industrial label printers, ticket dispensers, and thermal printer controllers often use the PIC17C44-33I/PQ as the head controller. Its 33 I/O pins drive stepper motors for paper feed and print-head position, read paper sensors and thermal head data, and communicate with the host via USART or parallel interface. The 16 KB OTP holds the print protocol stack, font tables, and control firmware. The 8.25 MIPS throughput generates dot patterns in real time without DMA. The industrial temperature grade is essential for factory and outdoor printing environments. Designers should validate OTP stock with Microchip before new product launches.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C44-33I/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 | PIC17C44-33I/PT | PIC17C44-25I/PQ | PIC17C44-33/PQ | PIC17C44-16I/PQ | PIC17C43-33I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-QFP (PQ) | 44-TQFP (PT) | 44-QFP (PQ) - same | 44-QFP (PQ) - same | 44-QFP (PQ) - same | 44-QFP (PQ) - same |
| Max Clock Frequency | 33 MHz | 33 MHz | 25 MHz | 33 MHz | 16 MHz | 33 MHz |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | Smaller (PIC17C43) |
| RAM Size | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | Reduced (PIC17C43) |
| Temperature Grade | Industrial (-40C to +85C) | Industrial | Industrial | Commercial (0C to +70C) | Industrial | Industrial |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 33 |
| Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Top speed grade of the PIC17C44 family (vsPIC17C44-25I/PQ)
- Largest memory configuration in PIC17C family (vsPIC17C43-33I/PQ)
- Industrial temperature grade versus commercial alternative (vsPIC17C44-33/PQ)
Ghi chú thiết kế
PIC17C44-33I/PQ uses OTP (one-time-programmable) memory that cannot be erased or rewritten once programmed. All firmware bugs must be resolved on engineering samples before committing to production programming. Allocate sufficient prototype quantities to validate the entire firmware build, including EEPROM emulation, calibration tables, and bootloader features. Engineers migrating from flash-based PIC18F parts must plan a different pre-production validation flow because errata discovered late cannot be fixed in OTP parts.
The 44-QFP (PQ) package has 0.8 mm pitch gull-wing leads that require careful PCB layout and a reflow profile with peak temperature below 250C for moisture-sensitive level (MSL) handling. Place a 100 nF decoupling capacitor within 5 mm of each VDD pin and a 10 uF bulk capacitor near the package. The /MCLR reset pin must be pulled up to VDD through a 10 kohm resistor with optional 100 nF cap for noise immunity. Avoid routing high-speed signals under the package to prevent noise coupling into analog inputs.
PIC17C44 is the top-speed variant (33 MHz) of the PIC17C family. When sourcing alternates, do not accidentally select the PIC17C44-25 or PIC17C44-16 grades without verifying that timing margins remain acceptable. Also verify the temperature grade suffix carefully: parts without the I-suffix are commercial grade (0C to +70C) and may fail in industrial environments. Confirm both speed and temperature grade in the part marking before PCB assembly.
Thông tin tuân thủ
Compliance data not present in the verified web data for this obsolete part; set to unknown per data authenticity rules. RoHS and lead-free status for legacy PIC17C44 family should be confirmed with Microchip directly before new product integration.
