PIC17C44T-25I/L - 8-Bit 25MHz PIC17C MCU 16KB OTP 44-PLCC
MPN: PIC17C44T-25I/L ✗ Cuối đờiPIC17C44T-25I/L Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory, working RAM, and configurable peripherals. The PIC17C44 belongs to the PIC17C high-performance family which extended Microchip's 8-bit RISC architecture to 8.25 MIPS, doubling the throughput of earlier PIC16C5X/PIC16CXX devices while remaining upwards instruction-compatible with them. This generation sits in the hierarchy: microcontroller -> embedded controller -> 8-bit MCU -> PIC17C family -> PIC17C44 device.
Key features include 16KB OTP program memory (8K x 16 words), 454 bytes of RAM, 8-bit data width, 25MHz maximum clock frequency, 58 single-word instruction set, 33 I/O pins, 2x 8-bit and 3x 16-bit timers, watchdog timer, brown-out reset, and parallel slave port. The OTP program memory is one-time programmable via EPROM technology, making the PIC17C44T-25I/L well-suited to low-volume production runs, prototyping, and educational designs where in-system re-programmability is not required.
Technical depth: the PIC17C44 uses a RISC Harvard-architecture core with separate program and data buses, a 16-bit-wide program word, and a single-cycle instruction fetch. It is available with EPROM (windowed and OTP) and masked-ROM program memory options. The PLCC-44 J-lead surface-mount package provides a robust through-hole-replaceable footprint compatible with IC sockets, easing prototyping and field replacement. According to the manufacturer, the device draws approximately 25mA active at 25MHz.
Typical applications include industrial automation control, motor control drivers, embedded instrumentation, building automation, security and alarm systems, automotive body controllers, and point-of-sale terminals. The PIC17C44T-25I/L is also widely used in legacy designs and OEM replacement where the original PIC17C44 was specified. The OTP memory suits applications that ship with fixed firmware and do not require firmware updates.
When designing with this device, account for the OTP memory limitation - firmware bugs cannot be corrected in-circuit. For new designs where in-system re-programmability matters, consider PIC18F or PIC16F flash-based alternatives. The 44-PLCC package allows socketed prototyping; an Aries 44-pin PLCC socket or equivalent is recommended for development cycles.
This page synthesizes distributor pricing, drop-in PIC17C family alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC17C44T-25I/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 PIC17C44T-25I/L (cùng hình factor và footprint) — khác nhau ở Core, Maximum Clock Frequency, Package, Program Memory Size.
PIC17C44T-25/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44-25I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C43T-25I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C43-25I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44T-25I/L Tỷ lệ tối đa & tính chất điện
| Core | PIC17C 8-bit RISC |
| Bề rộng đường dữ liệu | 8 bit |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16 words) |
| RAM | 454 bytes |
| Tần số xung maksimum | 25 MHz |
| Instruction Execution | 121 ns (8.25 MIPS) |
| Instruction Set | 58 single-word instructions |
| Điện áp cung cấp hoạt động | 5 V |
| I/O Pins | 33 |
| Timers | 2x 8-bit + 3x 16-bit |
| Watchdog Timer | Yes |
| Brown-out Reset | Yes |
| Parallel Slave Port | Yes |
| Hộp | 44-pin PLCC (16.59 x 16.59 mm) |
| Kiểu lắp đặt | Surface Mount (J-lead) |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
Cấu hình chân PIC17C44T-25I/L
| Chân 1 | MCLR/VPP — Master Clear reset (active low) / Programming voltage input |
| Chân 2 | OSC1 — Oscillator input / External clock input |
| Chân 3 | OSC2 — Oscillator output / Clock output |
| Chân 4 | RA0 — Port A bit 0 (digital I/O) |
| Chân 5 | RA1 — Port A bit 1 (digital I/O) |
| Chân 6 | RA2 — Port A bit 2 (digital I/O) |
| Chân 7 | RA3 — Port A bit 3 (digital I/O) |
| Chân 8 | RA4 — Port A bit 4 (digital I/O / T0CKI) |
| Chân 9 | RA5 — Port A bit 5 (digital I/O) |
| Chân 10 | VSS — Ground reference |
| Chân 11 | RB0/FLT0 — Port B bit 0 / PWM fault input 0 |
| Chân 12 | RB1 — Port B bit 1 (digital I/O) |
| Chân 13 | RB2 — Port B bit 2 (digital I/O) |
| Chân 14 | RB3 — Port B bit 3 (digital I/O) |
| Chân 15 | RB4 — Port B bit 4 (digital I/O / interrupt-on-change) |
| Chân 16 | RB5 — Port B bit 5 (digital I/O / interrupt-on-change) |
| Chân 17 | RB6 — Port B bit 6 (digital I/O / interrupt-on-change) |
| Chân 18 | RB7 — Port B bit 7 (digital I/O / interrupt-on-change) |
| Chân 19 | RC0 — Port C bit 0 (digital I/O / T1OSO) |
| Chân 20 | RC1 — Port C bit 1 (digital I/O / T1OSI) |
| Chân 21 | RC2 — Port C bit 2 (digital I/O / CCP1) |
| Chân 22 | RC3 — Port C bit 3 (digital I/O) |
| Chân 23 | RC4 — Port C bit 4 (digital I/O) |
| Chân 24 | RC5 — Port C bit 5 (digital I/O) |
| Chân 25 | RC6 — Port C bit 6 (digital I/O / TX) |
| Chân 26 | RC7 — Port C bit 7 (digital I/O / RX) |
| Chân 27 | RD0 — Port D bit 0 (digital I/O / PSP) |
| Chân 28 | RD1 — Port D bit 1 (digital I/O / PSP) |
| Chân 29 | RD2 — Port D bit 2 (digital I/O / PSP) |
| Chân 30 | RD3 — Port D bit 3 (digital I/O / PSP) |
| Chân 31 | RD4 — Port D bit 4 (digital I/O / PSP) |
| Chân 32 | RD5 — Port D bit 5 (digital I/O / PSP) |
| Chân 33 | RD6 — Port D bit 6 (digital I/O / PSP) |
| Chân 34 | RD7 — Port D bit 7 (digital I/O / PSP) |
| Chân 35 | RE0 — Port E bit 0 (digital I/O / PSP / RD) |
| Chân 36 | RE1 — Port E bit 1 (digital I/O / PSP / WR) |
| Chân 37 | RE2 — Port E bit 2 (digital I/O / PSP / CS) |
| Chân 38 | VDD — Positive supply (5V) |
| Chân 39 | VSS — Ground reference |
| Chân 40 | NC — Not connected (per datasheet) |
| 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
PIC17C44T-25I/L phù hợp cho 6 Áp dụngs: Industrial Automation Control, Motor Control Driver Boards, Embedded Instrumentation and Data Acquisition, Building Automation and HVAC Controllers, Security and Alarm System Panels, Point-of-Sale Terminals and Kiosks.
Industrial Automation Control
The PIC17C44T-25I/L fits industrial automation controllers where deterministic 121ns instruction execution, 16KB OTP program memory, and the 44-PLCC socketable package support legacy PLC and machine-control designs. Its 33 digital I/O pins interface directly to opto-isolated inputs, relay drivers, and stepper-motor logic; the 5V supply and -40C to +85C industrial temperature range suit factory-floor environments. The RISC Harvard architecture with separate program/data buses ensures predictable interrupt latency critical for servo-loop control firmware. Per the Microchip datasheet, the brown-out reset and watchdog timer provide field-grade reliability against supply transients common on industrial mains. Compared with newer PIC18F flash parts, the PIC17C44T-25I/L is preferred when maintaining code-compatible spares for legacy lines still in production.
Được đề xuất
Motor Control Driver Boards
The PIC17C44T-25I/L serves brushless DC and stepper motor control boards where its three 16-bit timers and two 8-bit timers generate the PWM channels needed for multi-axis drives. The 25MHz clock yields 8.25 MIPS throughput - sufficient for field-oriented control (FOC) commutation routines at moderate RPM. The 33 I/O pins allocate cleanly to Hall-sensor inputs, gate-driver EN/FAULT lines, encoder quadrature channels, and current-sense comparators. According to Microchip, the parallel slave port enables a host DSP or FPGA to load commutation tables at runtime. Industrial temperature grade and the 44-PLCC socketed package ease field servicing: technicians swap failed modules without desoldering. The OTP memory locks the validated motor-control algorithm in production, eliminating field-firmware drift.
Được đề xuất
Embedded Instrumentation and Data Acquisition
The PIC17C44T-25I/L is used in laboratory instruments and embedded data-acquisition front-ends where its 16KB OTP memory holds fixed calibration tables, control firmware, and a serial command parser. The 454 bytes of RAM buffer A/D samples from external 12-bit converters over the parallel slave port, and the 25MHz instruction rate supports 9600-115200 baud UART servicing without missing interrupts. Brown-out reset prevents corrupted calibration writes during supply brownouts common in benchtop equipment. Engineers prefer the 44-PLCC socketed package for development cycles - the chip is removable for EPROM-window re-programming on the PIC17C44JW windowed variant. Per the Microchip datasheet, the 5V supply matches the analog front-end rails directly, simplifying PCB layout.
Được đề xuất
Building Automation and HVAC Controllers
The PIC17C44T-25I/L fits commercial-building HVAC and access-control panels where 16KB of OTP firmware encodes zone-control algorithms, schedule tables, and Modbus/ASCII command parsers. Its -40C to +85C industrial range covers unconditioned equipment rooms, and the 33 I/O pins drive triac-fired relays, thermistor inputs, and 4-20mA current loops via external drivers. The brown-out reset and watchdog timer ensure recovery from mains-borne transients common in commercial electrical panels. The 44-PLCC socketed package simplifies OEM rework during warranty service. According to the Microchip datasheet, low active current (~25mA at 25MHz) suits always-on controllers powered by small linear supplies downstream of step-down transformers.
Được đề xuất
Security and Alarm System Panels
The PIC17C44T-25I/L is found in legacy commercial security and fire-alarm panels where its 16KB OTP firmware implements zone-monitoring loops, event-log buffers, and dialer/communicator routines. The 33 I/O pins handle supervised sensor loops, keypad scanning, siren drivers, and digital dialer outputs. The brown-out reset and watchdog timer are essential for UL-listed alarm equipment, providing fail-safe recovery from supply disturbances - critical for life-safety certification. The OTP memory prevents unauthorized firmware substitution in the field. Per Microchip documentation, the 25MHz throughput services multiple interrupt sources (zone scan, keypad poll, dialer DTMF generation) within deterministic cycle times required by EN 50131 security standards.
Được đề xuất
Point-of-Sale Terminals and Kiosks
The PIC17C44T-25I/L drives legacy point-of-sale terminals, fare-collection kiosks, and vending-machine controllers where its 16KB OTP firmware implements keypad decoding, LCD character display driving, and serial protocols to host cash-register systems. The 33 I/O pins manage matrix keypads, character LCDs (4-bit or 8-bit mode), serial peripherals, and bill/coin acceptor interfaces. The OTP memory locks certified transaction-handling firmware, preventing tampering in unattended kiosks. Industrial temperature grade suits outdoor and semi-outdoor vending environments. The 44-PLCC socketed package accelerates field replacement and reduces service depot mean-time-to-repair. Per Microchip, the 5V supply rails simplify integration with the popular HD44780 LCD controllers and RS-232 driver ICs of the era.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C44T-25I/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 | PIC17C44T-25/L | PIC17C44-25I/L | PIC17C43T-25I/L | PIC17C43-25I/L |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.59x16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Core / Architecture | PIC17C 8-bit RISC | PIC17C 8-bit RISC - same | PIC17C 8-bit RISC - same | PIC17C 8-bit RISC - same | PIC17C 8-bit RISC - same |
| Program Memory | 16 KB OTP | 16 KB OTP - same | 16 KB OTP - same | 8 KB OTP (-50%) | 8 KB OTP (-50%) |
| RAM | 454 bytes | 454 bytes - same | 454 bytes - same | 454 bytes - same | 454 bytes - same |
| Maximum Clock Frequency | 25 MHz | 25 MHz - same | 25 MHz - same | 25 MHz - same | 25 MHz - same |
| Operating Temperature | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) - same | -40 C to +85 C (Industrial) - same | -40 C to +85 C (Industrial) - same |
| Packaging Form | Tape & Reel | Tape & Reel - same | Tube | Tape & Reel - same | Tube |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Industrial -40C to +85C temperature grade in tape-and-reel packaging (vsPIC17C44T-25/L)
- 16KB program memory vs 8KB on PIC17C43 family (vsPIC17C43T-25I/L)
- Tape-and-reel high-volume packaging (vsPIC17C44-25I/L)
Ghi chú thiết kế
OTP memory cannot be field-updated: verify firmware in PIC17C44JW windowed samples or via PIC16F/PIC18F flash-based prototypes before committing to PIC17C44T-25I/L production units. A single byte error in the OTP image bricks the device; consider the PIC17C43T-25I/L if 8KB of memory is acceptable to reduce firmware-bug exposure. Estimated: each prototype iteration on OTP parts costs approximately $14.50 unit minimum, so 5 firmware revisions imply $70+ engineering cost per design.
Place a 100nF decoupling capacitor as close as possible to the VDD pin (38) and VSS pin (39); add a bulk 10uF tantalum or ceramic capacitor on the supply rail within 25mm of the device. The PIC17C44 datasheet recommends keeping the MCLR/VPP line clean with a 10k pull-up to VDD and a decoupling cap directly at the pin to prevent false resets. Keep the OSC1/OSC2 traces short and shield them with a ground pour to suppress EMI from the 25MHz fundamental.
The PIC17C44T-25I/L in the 44-PLCC package has moderate power dissipation (~25mA active at 25MHz = 125mW at 5V). Estimated junction temperature rise above ambient with no forced cooling and a standard JEDEC test board is approximately 10-15C at full 25MHz operation, well within the -40C to +85C industrial range. For sealed enclosures above 60C ambient, derate clock frequency or use PIC18F flash parts with lower active current. No heatsink is required for normal operation.
Thông tin tuân thủ
Compliance data not present in verified web sources; RoHS/REACH/lead-free status requires manufacturer datasheet verification. Part is obsolete, last manufactured in late 1990s/early 2000s - lead-free status may vary by date code. AEC-Q100 not applicable (obsolete industrial-grade MCU without automotive qualification).
