PIC17C44T-25E/PT - 8-Bit OTP MCU, 16KB, 25MHz, 44-TQFP | Microchip
MPN: PIC17C44T-25E/PT ✗ Cuối đờiPIC17C44T-25E/PT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/EPROM/Flash), data memory (RAM), and peripherals such as timers, PWM, ADC, and I/O ports onto one silicon die. Within the broader taxonomy, an MCU belongs to the family of microprocessors -> microcontrollers -> 8-bit microcontrollers -> embedded controllers. PIC17C44 specifically belongs to Microchip's high-performance PIC17 family, positioned between PIC16 mid-range parts and PIC18 enhanced parts, and was later superseded functionally by PIC18F442 per the manufacturer's current product page.
Key differentiating features of the PIC17C44 include a Harvard-architecture RISC core, 33 digital I/O pins, an 8-bit timer/counter with PWM capability, an enhanced UART, multiple interrupt sources, power-on reset (POR), brown-out reset (BOR), watchdog timer (WDT), and an external oscillator interface supporting crystal, RC, and resonator modes. The 'E' suffix in the part number denotes the Extended industrial temperature grade of -40C to +125C, while the 'T' indicates tape-and-reel packaging.
Architecturally, the PIC17C44 implements a 16-bit-wide instruction word with separate program and data buses, enabling single-cycle instruction fetch. The OTP EPROM cell array is windowless and one-time programmable; engineering samples use a ceramic windowed package for erasure during development. Brown-out detection and a low-voltage detector protect the part from code corruption during supply droop events.
Typical applications include industrial control, motor drive PWM control loops, instrumentation, automotive subsystems, and legacy embedded systems requiring deterministic 8-bit execution. Engineers typically pair this MCU with external op-amps, RS-232/RS-485 transceivers, and EPROM/Flash memory in expanded bus modes. Design tip: in noisy industrial environments, place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair and use a watchdog timeout longer than the longest expected blocking routine to avoid spurious resets.
Bộ thay thế dễ dàng lắp đặt cho PIC17C44T-25E/PT — 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 PIC17C44T-25E/PT (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Program Memory Size, Program Memory Type, Maximum Clock Frequency.
PIC17C44-25I/PT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44T-25/PT
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Xem tài liệu →PIC17C44-16I/PT
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Xem tài liệu →PIC17C43T-25E/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C42AT-25/PT
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Xem tài liệu →PIC17C43T-16/PT
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Xem tài liệu →PIC17C44T-25E/PT Tỷ lệ tối đa & tính chất điện
| Core Architecture | 8-bit PIC RISC |
| Family | PIC17C |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 454 bytes |
| Maximum CPU Frequency | 25 MHz |
| Instruction Execution Throughput | 8.25 MIPS (121 ns per instruction) |
| Instruction Set Size | 58 single-word instructions |
| I/O Pins | 33 |
| Hộp | 44-pin TQFP (PT) |
| Kiểu lắp đặt | Surface Mount |
| Điện áp cung cấp hoạt động | 5 V (typical, see datasheet range) |
| Khoảng nhiệt độ hoạt động | -40C to +125C (Extended grade, 'E' suffix) |
| Packaging | Tape & Reel ('T' suffix) |
| Peripherals | PWM, WDT, POR, BOR, UART, Timers |
| Oscillator Type | External (crystal/RC/resonator) |
Cấu hình chân PIC17C44T-25E/PT
| Chân 1 | OSC1 — External oscillator input (crystal/RC) |
| Chân 2 | OSC2 — External oscillator output |
| Chân 3 | MCLR — Master clear / external reset, active low |
| Chân 4 | RA0 — PORTA bit 0 (digital I/O) |
| Chân 5 | RA1 — PORTA bit 1 |
| Chân 6 | RA2 — PORTA bit 2 |
| Chân 7 | RA3 — PORTA bit 3 |
| Chân 8 | RA4 — PORTA bit 4 (also T0CKI timer0 clock input) |
| Chân 9 | RA5 — PORTA bit 5 |
| Chân 10 | VSS — Ground reference |
| Chân 11 | RA6 — PORTA bit 6 |
| Chân 12 | RA7 — PORTA bit 7 |
| Chân 13 | RB0 — PORTB bit 0 (external interrupt capable) |
| Chân 14 | RB1 — PORTB bit 1 |
| Chân 15 | RB2 — PORTB bit 2 |
| Chân 16 | RB3 — PORTB bit 3 |
| Chân 17 | RB4 — PORTB bit 4 |
| Chân 18 | RB5 — PORTB bit 5 |
| Chân 19 | RB6 — PORTB bit 6 |
| Chân 20 | RB7 — PORTB bit 7 |
| Chân 21 | VSS — Ground |
| Chân 22 | VDD — Positive supply (5V) |
| Chân 23 | RC0 — PORTC bit 0 (also TX/CK UART) |
| Chân 24 | RC1 — PORTC bit 1 (also RX/DT UART) |
| Chân 25 | RC2 — PORTC bit 2 (PWM1 output) |
| Chân 26 | RC3 — PORTC bit 3 (PWM2 output) |
| Chân 27 | RC4 — PORTC bit 4 |
| Chân 28 | RC5 — PORTC bit 5 |
| Chân 29 | RC6 — PORTC bit 6 |
| Chân 30 | RC7 — PORTC bit 7 |
| Chân 31 | VSS — Ground |
| 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 |
| Chân 41 | RE0 — PORTE bit 0 |
| Chân 42 | RE1 — PORTE bit 1 |
| Chân 43 | RE2 — PORTE bit 2 |
| Chân 44 | RE3 — PORTE bit 3 |
Ứng dụng tiêu biểu
PIC17C44T-25E/PT phù hợp cho 6 Áp dụngs: Industrial Motor Control (PWM), Automotive Body Control Modules, Instrumentation and Data Acquisition, Legacy Embedded System Maintenance, Security and Tamper-Resistant Devices, Educational and Prototyping Platforms.
Industrial Motor Control (PWM)
The PIC17C44T-25E/PT's 8.25 MIPS throughput and on-chip PWM module suit brushed DC and stepper motor control loops where deterministic 121 ns instruction execution closes the control loop within tight cycle budgets. The 25 MHz CPU handles encoder feedback sampling, PID computation, and PWM duty updates in real time. With 33 digital I/O pins and extended -40C to +125C operation, the part fits factory-floor motor drives, conveyor controllers, and valve actuators operating near heat-generating power electronics. Pair the MCU with external gate drivers such as MC3309x or IR2104 and use optocouplers for high-voltage isolation between the 5V MCU domain and the motor bus.
Được đề xuất
Automotive Body Control Modules
PIC17C44T-25E/PT's extended -40C to +125C operating range, 33 I/O pins, and robust EPROM-based code storage (no Flash corruption from brown-outs or EMI) suit automotive body controllers, climate control panels, and lighting modules. The on-chip UART supports LIN-bus peripherals via a software stack, while the PWM module drives incandescent and LED loads. While the part is NRND and not AEC-Q100 qualified, designers maintaining legacy automotive platforms continue to use PIC17C44 where the OTP-once-programmed nature provides tamper resistance for shipped firmware. Pair with TJA1020 LIN transceiver and use watchdog timer + brown-out reset to survive load-dump transients.
Được đề xuất
Instrumentation and Data Acquisition
PIC17C44T-25E/PT's 25 MHz instruction throughput and 33 I/O channels support multi-channel data acquisition front-ends where the MCU multiplexes ADC inputs, drives LCD or LED displays, and streams measurements over UART to a host. Its 454-byte RAM is sufficient for ring buffers and running averages on low-rate sensor streams (1 kHz or less). The Harvard RISC architecture guarantees deterministic interrupt latency, important when sampling phase-sensitive sensors such as thermistors, load cells, or strain gauges. Designers often pair this MCU with external 12-bit ADCs (such as MCP3201), instrumentation amplifiers (such as MCP6N11), and 4x20 LCD modules.
Được đề xuất
Legacy Embedded System Maintenance
PIC17C44T-25E/PT is widely used in maintenance and refurbishment of legacy industrial systems deployed in the 1990s and 2000s. Many PLCs, textile machinery, elevator controllers, and HVAC equipment were designed around PIC17C44 and remain in service 20+ years later. NRND status means Microchip is phasing out production, but distributor stock and limited factory runs continue to support field replacement. The OTP EPROM's one-time-programmed nature is actually advantageous for legacy support - the firmware cannot be overwritten by accident during service. Engineers maintaining these systems should verify PIC17C44 stock at distributors and consider PIC18F442 as a pin-compatible migration target where feasible.
Được đề xuất
Security and Tamper-Resistant Devices
PIC17C44T-25E/PT's OTP EPROM provides inherent code security - once programmed, firmware cannot be read back or modified, supporting tamper-resistant applications like access controllers, electronic locks, and metering devices. The 16 KB code space accommodates encrypted stack and authentication routines. Combined with watchdog timer and brown-out reset, the part resists common fault-injection attacks. While modern Secure Elements offer stronger cryptographic primitives, PIC17C44 remains adequate for cost-sensitive, low-throughput security applications where the threat model is casual reverse-engineering rather than advanced persistent threat.
Được đề xuất
Educational and Prototyping Platforms
PIC17C44T-25E/PT remains a teaching vehicle in university embedded-systems courses because it exposes the classic Harvard RISC architecture without Flash abstraction complexity. Students learn OTP programming workflows, EPROM erasure in windowed ceramic variants, and the PIC instruction set at near-oscillator speed. The 25 MHz CPU and 33 I/O allow meaningful lab projects (PID motor control, UART protocols, interrupt-driven I/O) within a single semester. While PIC18 and dsPIC33 are more common today, instructors specifically chose PIC17C44 to teach RISC fundamentals. Pair with PIC-ICD2 or PICkit programmers and a 44-pin TQFP breakout board.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C44T-25E/PT — 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 | PIC17C44-25I/PT | PIC17C44T-25/PT | PIC17C44-16I/PT | PIC17C43T-25E/PT | PIC17C42AT-25/PT | PIC17C43T-16/PT |
|---|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Size | 16 KB OTP EPROM | 16 KB OTP EPROM | 16 KB OTP EPROM | 16 KB OTP EPROM | 8 KB OTP EPROM (-50%) | 4 KB OTP EPROM (-75%) | 8 KB OTP EPROM (-50%) |
| Maximum CPU Clock | 25 MHz | 25 MHz | 25 MHz | 16 MHz (-36%) | 25 MHz | 33 MHz (+32%) | 16 MHz (-36%) |
| RAM Size | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Range | -40C to +125C (Extended) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| Packaging Format | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- Extended industrial temperature grade for harsh environments (vsPIC17C44T-25/PT)
- 16 KB program memory vs 8 KB sibling (vsPIC17C43T-25E/PT)
- 25 MHz maximum CPU clock for real-time control (vsPIC17C44-16I/PT)
- Tape-and-reel packaging for high-volume SMT assembly (vsPIC17C44-25I/PT)
Ghi chú thiết kế
Decouple each VDD/VSS pair on the PIC17C44T-25E/PT with a 100 nF ceramic capacitor placed within 5 mm of the pin. The 44-pin TQFP has four VDD/VSS pairs (pins 10/22, 21/22, 31/40) that must each be bypassed to prevent logic errors during high-frequency PWM switching events. Add a bulk 10 uF tantalum or aluminum electrolytic capacitor at the board power input. Brown-out reset (BOR) should be enabled in the configuration word to protect OTP EPROM from corruption during supply droop.
PIC17C44T-25E/PT's 44-pin TQFP package has a thermal resistance of approximately 50 C/W (theta_JA) without airflow, which is adequate for the typical <100 mA operating current of an 8-bit MCU. Estimated: at 25 MHz full operation, VDD=5V, ICC approximately 25 mA, power dissipation is approximately 125 mW, giving a junction temperature rise of about 6.25 C above ambient. For applications near the +125C upper limit, derate by reducing CPU clock or providing 100 LFM airflow across the package.
OTP EPROM cannot be erased after programming. Design firmware for PIC17C44T-25E/PT in a JW (windowed ceramic) package first, verify functionality, then commit to the OTP PT production variant. Configuration-word errors such as disabling the watchdog or selecting wrong oscillator mode can lock the part with no recovery path. Always read configuration word back after programming. MCLR must be pulled high through a 10 kohm resistor to VDD for proper operation; floating MCLR causes spurious resets.
OSC1/OSC2 pins driving a crystal oscillator should be guarded by a ground ring and isolated from switching signals. Place the crystal within 10 mm of the MCU and use short, symmetric traces. For RC oscillator mode, the RC components must be adjacent to OSC1/RA6 with the capacitor to ground. The 33 I/O pins can source/sink 25 mA each (per pin) and 200 mA total per port group; exceeding these limits without series resistors will damage the output drivers. Add 100 ohm series resistors on PWM outputs that drive MOSFET gates to damp ringing.
Thông tin tuân thủ
Compliance status not stated in verified web data. PIC17C44T-25E/PT is NRND and predates widespread RoHS documentation on Microchip's public web pages. AEC-Q100 qualification is not claimed by Microchip - this part is not recommended for new automotive designs.