PIC17C44T-33/PQ - 8-Bit 33MHz OTP MCU 16KB | Microchip
MPN: PIC17C44T-33/PQ ✗ پایان تولیدPIC17C44T-33/PQ نمای کلی
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals into one package. The PIC17C family sits in Microchip's high-performance 8-bit tier - above the baseline PIC16 line and below the PIC18 - and was the first PIC family to use a 16-bit program word with a 16-bit instruction set, increasing code density and execution speed for embedded applications. PIC17C44T-33/PQ belongs to the broader Microcontrollers > Integrated Circuits semiconductor category.
Key features include the 33 MHz maximum operating frequency, 16KB OTP program memory (8K x 16 words), 454 bytes of data RAM, 33 I/O pins, and hardware multiply/divide support. The device also includes multiple timer modules, a USART serial port, and interrupt handling suitable for real-time embedded control. The OTP memory allows one-time programming for low-volume production and is typically used where firmware is finalized and EEPROM-style in-field updates are not required.
Architecturally, the PIC17C44 uses a RISC instruction set with a two-stage pipeline, separate program and data buses (Harvard architecture), and an 8-bit data path with 16-bit instructions. This combination delivers approximately 121 ns instruction cycle time at 33 MHz. The chip is built on a CMOS process and supports both commercial and industrial temperature grades, depending on the part suffix.
Typical applications include industrial automation controllers, motor control, embedded instrumentation, sensor signal conditioning, and legacy embedded designs originally specified on the PIC17C platform. Because the part is OTP rather than flash, it is best suited to high-volume, fixed-firmware applications where field reprogramming is not a requirement.
When designing with the PIC17C44T-33/PQ, note that this device is part of the older PIC17C generation and has been superseded for most new designs by PIC18 and dsPIC families with flash memory. Verify current lifecycle status before new design-in. Provide a stable 5 V rail and proper decoupling close to the VDD pins.
This page synthesizes distributor pricing, drop-in alternatives from the PIC17C and PIC16C families, and practical design notes that go beyond the manufacturer datasheet to help engineers source and qualify the PIC17C44T-33/PQ.
جایگزین‌های drop-in برای PIC17C44T-33/PQ — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای PIC17C44T-33/PQ (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Core, RAM Size, Program Memory Size, Program Memory Type.
PIC17C44T-33I/PQ
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C44T-16/PQ
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C44T-25I/PQ
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C44T-33E/PQ
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
PIC17C44T-25E/PT
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C44-16I/PQ
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←PIC17C44T-33/PQ حداکثر مقادیر مجاز و مشخصات الکتریکی
| Core Processor | PIC |
| Core Size | 8-Bit |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 16 KB (8K x 16 words) |
| Data RAM Size | 454 bytes |
| حداکثر فرکانس کلاک | 33 MHz |
| Supply Voltage (Vcc/Vdd) | 5 V |
| Number of I/O Pins | 33 |
| Architecture | RISC, Harvard |
| Instruction Set | 16-bit instructions, 8-bit data path |
| بسته‌بندی | 44-pin MQFP (PQ) |
| نوع نصب | Surface Mount |
| Packaging | Tape & Reel (T suffix) |
| Series | PIC17C |
| Connectivity | USART |
پیکربندی پین PIC17C44T-33/PQ
| پین 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| پین 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| پین 3 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| پین 4 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| پین 5 | RA4/AN4 — PORTA bit 4 / Analog input 4 |
| پین 6 | RA5/AN5 — PORTA bit 5 / Analog input 5 |
| پین 7 | RA6/AN6 — PORTA bit 6 / Analog input 6 |
| پین 8 | RA7/AN7 — PORTA bit 7 / Analog input 7 |
| پین 9 | MCLR/VPP — Master Clear reset (active low) / Programming voltage |
| پین 10 | VDD — Positive supply voltage (5V) |
| پین 11 | VSS — Ground reference |
| پین 12 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| پین 13 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| پین 14 | RC0/T1CKI — PORTC bit 0 / Timer1 clock input |
| پین 15 | RC1/CCP2 — PORTC bit 1 / Capture/Compare/PWM 2 |
| پین 16 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| پین 17 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| پین 18 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| پین 19 | RC5/SDO — PORTC bit 5 / SPI data out |
| پین 20 | RC6/TX/CK — PORTC bit 6 / USART transmit / clock |
| پین 21 | RC7/RX/DT — PORTC bit 7 / USART receive / data |
| پین 22 | RB0/INT0 — PORTB bit 0 / External interrupt 0 |
| پین 23 | RB1/INT1 — PORTB bit 1 / External interrupt 1 |
| پین 24 | RB2/INT2 — PORTB bit 2 / External interrupt 2 |
| پین 25 | RB3/INT3 — PORTB bit 3 / External interrupt 3 |
| پین 26 | RB4 — PORTB bit 4 |
| پین 27 | RB5 — PORTB bit 5 |
| پین 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| پین 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| پین 30 | VSS — Ground reference |
| پین 31 | VDD — Positive supply voltage (5V) |
| پین 32 | RD0 — PORTD bit 0 |
| پین 33 | RD1 — PORTD bit 1 |
| پین 34 | RD2 — PORTD bit 2 |
| پین 35 | RD3 — PORTD bit 3 |
| پین 36 | RD4 — PORTD bit 4 |
| پین 37 | RD5 — PORTD bit 5 |
| پین 38 | RD6 — PORTD bit 6 |
| پین 39 | RD7 — PORTD bit 7 |
| پین 40 | RE0 — PORTE bit 0 |
| پین 41 | RE1 — PORTE bit 1 |
| پین 42 | RE2 — PORTE bit 2 |
| پین 43 | RE3 — PORTE bit 3 |
| پین 44 | NC — Not connected (per datasheet) |
کاربردهای معمول
PIC17C44T-33/PQ مناسب است برای 7 کاربردs: Industrial Automation Controllers, Motor Control and PWM Drive, Legacy Embedded Instrumentation, Sensor Signal Conditioning and Acquisition, Automotive Body and Chassis Modules (Legacy), Point-of-Sale and Terminal Peripherals, Security and Access-Control Panels.
Industrial Automation Controllers
The PIC17C44T-33/PQ fits industrial automation controllers because of its 33 MHz RISC core, 33 digital I/O lines, and USART for fieldbus or sensor interfaces. Its Harvard architecture delivers deterministic instruction timing at 121 ns per cycle, which matters for closed-loop control where jitter directly affects regulation quality. The 16 KB OTP program memory accommodates moderate state machines and PID loops, while the 454-byte RAM handles small data buffers and stack depth for nested interrupt routines. Engineers typically pair the part with optocouplers and 24 V interface circuitry on the I/O lines.
پیشنهادی
Motor Control and PWM Drive
The PIC17C44T-33/PQ suits motor-control applications because its 33 MHz instruction throughput handles multi-channel PWM generation and back-EMF sampling within tight control-loop budgets. The 33 I/O pins can be partitioned into PWM outputs, quadrature encoder inputs, current-shunt amplifier feedback, and H-bridge gate-driver controls, while the timers support input-capture for speed measurement and output-compare for switching waveforms. The hardware multiply assists in field-oriented control (FOC) math. With 16 KB OTP, the firmware can store commutation tables and PI controller constants without external memory.
پیشنهادی
Legacy Embedded Instrumentation
Sustaining legacy instrumentation such as bench meters, panel displays, and data loggers is a natural fit for the PIC17C44T-33/PQ, where the firmware is locked and the PCB was originally designed around the PIC17C pinout. The USART interfaces with character LCDs or external ADCs, while the 33 I/O lines scan keypads, drive relays, and read sensor bridges. OTP memory is appropriate here because the firmware has been qualified and validated - field updates are not required. Migration to flash parts would force re-qualification, so the legacy MCU is the lowest-risk choice.
پیشنهادی
Sensor Signal Conditioning and Acquisition
Sensor signal-conditioning front-ends benefit from the PIC17C44T-33/PQ's 33 MHz throughput to oversample sensor waveforms and apply digital filtering on-chip. The USART can stream conditioned data to a host processor, while the 33 I/O lines handle multiplexed analog-front-end switching, gain-control relays, and calibration EEPROM handshaking. With 16 KB OTP, the firmware can store sensor-linearization lookup tables and unit-conversion routines. The Harvard architecture guarantees deterministic sampling intervals, which is essential for FFT or correlation-based measurement techniques.
پیشنهادی
Automotive Body and Chassis Modules (Legacy)
Legacy automotive body controllers - such as window lifts, mirror adjusters, and lighting sequencers - were specified around the PIC17C44T-33/PQ, where 33 MHz handles CAN-style bit-banging or LIN-master timing and the 33 I/O drive relays and H-bridges directly. The OTP memory is acceptable because firmware is finalized for the vehicle platform and never changed in production. Industrial-temp variants of the same die support under-hood environments. Engineers should confirm AEC-Q100 status before specifying this part for new automotive designs.
پیشنهادی
Point-of-Sale and Terminal Peripherals
The PIC17C44T-33/PQ appears in legacy POS peripherals - magnetic-stripe readers, keypad scanners, and printer drivers - because 33 MHz delivers the responsiveness needed for keypad debouncing, character-LCD refresh, and serial-port arbitration. The USART connects to the main terminal CPU, while the 33 I/O lines scan the keypad matrix, drive buzzer and LED indicators, and step the print-head motor. OTP memory locks the peripheral firmware against tampering. For new designs, evaluate flash-based PIC18 or dsPIC equivalents for supply-chain resilience.
پیشنهادی
Security and Access-Control Panels
Access-control panels use the PIC17C44T-33/PQ to scan keypad or card-reader inputs, drive relay outputs for door strikes, and log events over USART to a central controller. The 33 MHz instruction rate handles simultaneous keypad scanning, debouncing, and watchdog refresh without missing pulses. OTP memory prevents firmware tampering - a security-relevant property in physical-access-control products. Industrial-temp variants support outdoor or unheated enclosures. The 33 I/O lines accept multiple reader formats and supervise tamper switches.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای PIC17C44T-33/PQ — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | PIC17C44T-33I/PQ | PIC17C44T-16/PQ | PIC17C44T-25I/PQ | PIC17C44T-33E/PQ | PIC17C44-16I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | 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 | 44-pin MQFP (PQ) - same |
| Maximum Clock Frequency | 33 MHz | 33 MHz | 16 MHz (-52%) | 25 MHz (-24%) | 33 MHz | 16 MHz (-52%) |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP |
| Data RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| Number of I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Commercial | Industrial (-40C to +85C) | Commercial | Industrial (-40C to +85C) | Extended (-40C to +125C) | Industrial (-40C to +85C) |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
تفاوت‌های کلیدی
- Highest clock speed in the PIC17C44 family at 33 MHz (در مقابلPIC17C44T-16/PQ)
- Commercial temperature grade baseline (در مقابلPIC17C44T-33I/PQ)
- Same-die drop-in options across temperature grades (در مقابلPIC17C44T-33E/PQ)
- Larger 454-byte data RAM for buffered control (در مقابلPIC16F877A-I/P)
یادداشت‌های طراحی
The PIC17C44T-33/PQ operates from a single 5 V supply on the VDD pins (10 and 31). Place a 100 nF decoupling capacitor close to each VDD pin and a bulk 10 uF tantalum or ceramic capacitor at the board entry point. The PIC17C44 core draws higher dynamic current at 33 MHz than at 16 MHz, so the regulator must supply at least 50 mA above any I/O sink/source budget. Tie unused I/O pins to VDD or VSS to avoid floating-input shoot-through currents.
At 33 MHz with all 33 I/O lines switching, the PIC17C44T-33/PQ draws approximately 30-40 mA from VDD, dissipating 150-200 mW in the 44-pin MQFP package. The thermal resistance theta_JA for this package is approximately 50-60 C/W, giving a 10-12 C junction rise above ambient. No heatsink is required, but providing a small ground copper pour under the package improves thermal performance and EMI. Estimated thermal values - confirm against the manufacturer datasheet for the exact board layout.
Route the oscillator traces (OSC1, OSC2) short and symmetric, with the crystal and load capacitors within 5 mm of the MCU. Place MCLR pull-up (typically 10 kohm to VDD) and any reset capacitor close to the pin. Avoid routing high-current I/O traces under the MQFP - keep noisy lines (relay drivers, motor phases) on the opposite side of the board. A 4-layer PCB with a solid ground plane is recommended for 33 MHz operation to control EMI.
The PIC17C44T-33/PQ uses OTP memory - once programmed, the firmware cannot be erased or rewritten. Confirm firmware is bug-free before programming production units, and consider adding a small external EEPROM for non-volatile parameters. Watch for the PIC17C44 vs PIC17C43 difference: PIC17C43 has 8 KB program memory and 232 bytes RAM, while PIC17C44 has 16 KB and 454 bytes - firmware written for one will not fit the other.
اطلاعات انطباق
Compliance data for PIC17C44T-33/PQ not present in verified web sources. PIC17C family parts were typically supplied in lead-containing MQFP packages; verify against current Microchip material declaration before RoHS-restricted end products. AEC-Q100 qualification not present - do not use for new automotive designs without further qualification.
