PIC17C44/JW - 8-bit OTP MCU, 16KB EPROM, 33MHz | Microchip
MPN: PIC17C44/JW ✗ Cuối đờiPIC17C44/JW Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, and programmable I/O peripherals. Within the broader taxonomy, the PIC17C44 sits in the 8-bit microcontroller category of the microcontroller IC family, which in turn belongs to embedded processors and microcontrollers. The PIC17C architecture uses Harvard memory organization with separate program and data buses, enabling simultaneous instruction fetch and data access.
Key features include only 58 single-word instructions, an OTP (One-Time Programmable) EPROM-based program memory, a CMOS process technology for low power consumption, and 33 digital I/O pins. The architecture supports nested interrupts and a hardware multiply unit, which was distinctive for an 8-bit MCU at the time of introduction. The 16-bit instruction width allows most instructions to encode both opcode and operand in a single word.
Typical applications include industrial control systems, legacy embedded designs, motor control firmware platforms, and educational/training platforms where the OTP memory and CERDIP package support prototyping through-window UV erasure. The through-hole CERDIP package remains useful in legacy equipment repair and aerospace/military applications where socketed parts and field re-programmability via UV erasure are valued.
When designing with this part, note that the OTP memory cannot be electrically erased - only the JW (windowed CERDIP) variant allows UV erasure for prototyping. Production builds typically use the non-windowed variants. Consider the PIC18F442, recommended by Microchip as a newer substitute offering Flash memory and enhanced peripherals in a compatible footprint family.
This page synthesizes distributor pricing, drop-in alternatives within the PIC17C family, and practical design notes not consolidated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC17C44/JW — 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/JW (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Core, Maximum Clock Frequency, Program Memory Type.
PIC17C44-25/JW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44-16/JW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44T-25I/JW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44-25I/JW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC17C44T-25I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C43/JW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17C44/JW Tỷ lệ tối đa & tính chất điện
| Core | 8-bit PIC RISC |
| Family | PIC17C Series |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 16 KB (8K x 16) |
| Data RAM | 454 bytes |
| Tần số xung maksimum | 33 MHz |
| Instruction Execution Time | 121 ns (8.25 MIPS) |
| Instruction Set Size | 58 single-word instructions |
| I/O Pins | 33 |
| Hộp | 40-pin CERDIP (WDIP, JW) |
| Terminal Form | Through-Hole |
| Number of Terminals | 40 |
| Temperature Grade | Commercial |
| Process Technology | CMOS |
| AEC-Q100 | not_applicable |
Cấu hình chân PIC17C44/JW
| Chân 1 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 2 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 3 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 4 | RA3/AN3 — Port A bit 3 / Analog input 3 |
| Chân 5 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Chân 6 | RA5/SS — Port A bit 5 / SPI slave select |
| Chân 7 | OSC1/CLKIN — Oscillator input / external clock |
| Chân 8 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 9 | MCLR/VPP — Master clear reset / programming voltage |
| Chân 10 | VSS — Ground |
| Chân 11 | VDD — Positive supply voltage |
| 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 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator out / clock in |
| Chân 21 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator in / CCP2 |
| Chân 22 | RC2/CCP1 — Port C bit 2 / CCP1 |
| Chân 23 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 24 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 25 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 26 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Chân 27 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Chân 28 | RD0 — Port D bit 0 |
| Chân 29 | RD1 — Port D bit 1 |
| Chân 30 | RD2 — Port D bit 2 |
| Chân 31 | RD3 — Port D bit 3 |
| Chân 32 | RD4 — Port D bit 4 |
| Chân 33 | RD5 — Port D bit 5 |
| Chân 34 | RD6 — Port D bit 6 |
| Chân 35 | RD7 — Port D bit 7 |
| Chân 36 | RE0/RD — Port E bit 0 / parallel slave port read |
| Chân 37 | RE1/WR — Port E bit 1 / parallel slave port write |
| Chân 38 | RE2/CS — Port E bit 2 / parallel slave port chip select |
| Chân 39 | VSS — Ground |
| Chân 40 | VDD — Positive supply voltage |
Ứng dụng tiêu biểu
PIC17C44/JW phù hợp cho 7 Áp dụngs: Legacy Industrial Control Systems, Aerospace and Military Sustainment, Educational Microcontroller Training, Motor Control and PWM Drive Firmware, Automotive Subsystem Legacy Repair, Point-of-Sale and Retail Peripherals, Medical Device Legacy Sustainment.
Legacy Industrial Control Systems
The PIC17C44/JW fits legacy industrial control applications because its 8.25 MIPS throughput, 33 programmable I/O pins, and 16KB EPROM program memory provide sufficient headroom for state-machine control of conveyors, valve sequencing, and machine-tool auxiliary logic. Engineers often paired this MCU with external latches and opto-isolated I/O for factory-floor noise immunity. The 454-byte RAM is adequate for bit-banged protocols, scheduling counters, and PID-style control loops typical of 1990s-era PLC designs.
Được đề xuất
Aerospace and Military Sustainment
The PIC17C44/JW is well suited to aerospace and military sustainment programs where the windowed CERDIP (JW) package allows UV erasure and reprogramming during depot-level maintenance. Its commercial temperature grade plus availability of the -I/JW industrial variant lets sustainment engineers match original Avionics and weapons-system OEM part numbers across multiple platforms. The 40-pin through-hole WDIP package also survives the high-shock and vibration profiles common to aerospace environments better than many surface-mount alternatives.
Được đề xuất
Educational Microcontroller Training
The PIC17C44/JW is ideal for university microcontroller labs and embedded-systems coursework because the windowed CERDIP package lets students erase and reprogram the device repeatedly under a UV lamp, supporting iterative experimentation. The 58-instruction PIC17C RISC ISA is small enough to learn in a single semester yet rich enough to teach real concepts like interrupts, timers, and parallel I/O. Instructors benefit from the through-hole 40-pin DIP form factor, which fits standard breadboards and ZIF sockets for fast class turnaround.
Được đề xuất
Motor Control and PWM Drive Firmware
The PIC17C44/JW fits motor-control firmware platforms because its 33 MHz clock, 8.25 MIPS throughput, and 16-bit-wide instruction bus support deterministic PWM generation at frequencies up to hundreds of kHz when paired with the on-chip CCP module. The 33 I/O pins accommodate quadrature encoder inputs, Hall-effect sensor feedback, and half-bridge gate-driver signals for three-phase inverter stages. The OTP memory enforces firmware version control, which is desirable in certified motor-drive appliances where field firmware updates are not allowed.
Được đề xuất
Automotive Subsystem Legacy Repair
The PIC17C44/JW is a practical choice for sustaining older automotive subsystems where the OEM firmware was implemented on this exact OTP MCU. Replacement modules for body controllers, instrument clusters, and HVAC panels in 1990s-era vehicles often require identical pinout, instruction set, and timing characteristics to preserve the original behavior. The 33 I/O pins cover typical automotive loads including relay drivers, switch inputs, and analog sensing through external multiplexers. The windowed package aids depot repair workflows where firmware must be re-burned after PCB rework.
Được đề xuất
Point-of-Sale and Retail Peripherals
The PIC17C44/JW is suitable for legacy point-of-sale peripherals including barcode scanner controllers, receipt printer interfaces, and cash-drawer drivers where the 33 I/O lines handle keypad scanning, LCD multiplexing, and serial communication to the main terminal. Its 454-byte RAM supports small transaction buffers and protocol state machines while the 16KB EPROM holds finite-state-machine firmware plus lookup tables. The through-hole WDIP package is rugged enough for the mechanical vibration of retail checkout environments.
Được đề xuất
Medical Device Legacy Sustainment
The PIC17C44/JW fits medical-device sustainment programs for equipment originally certified with this MCU, where regulatory re-approval of new hardware is prohibitively expensive. The OTP memory enforces firmware immutability, supporting FDA 21 CFR Part 11 traceability expectations. The windowed CERDIP package supports factory programming plus depot-level erase-reprogram cycles during authorized field-service events. Engineers must verify the commercial temperature grade meets the device's enclosure thermal profile.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17C44/JW — 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 | PIC17C44-25/JW | PIC17C44-16/JW | PIC17C44T-25I/JW | PIC17C44-25I/JW | PIC17C43/JW |
|---|---|---|---|---|---|---|
| Package | 40-pin CERDIP (WDIP, JW) | 40-pin CERDIP (WDIP) | 40-pin CERDIP (WDIP) | 40-pin CERDIP (WDIP) | 40-pin CERDIP (WDIP) | 40-pin CERDIP (WDIP) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 33 MHz | 25 MHz | 16 MHz | 25 MHz | 25 MHz | 33 MHz |
| Program Memory Size | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB | 8 KB |
| Data RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| Temperature Grade | Commercial | Commercial | Commercial | Industrial | Industrial | Commercial |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Highest speed screening in the PIC17C44 family (vsPIC17C44-25/JW)
- Windowed CERDIP package for UV-erase development (vsPIC17C44-16/P)
- Commercial temperature grade baseline (vsPIC17C44-I/JW)
Ghi chú thiết kế
The PIC17C44/JW contains OTP EPROM that cannot be electrically erased. Only the JW (windowed CERDIP) variant is erasable via UV exposure through the quartz window. Use the JW package for development and prototyping cycles; reserve the non-windowed /P and /L variants for production builds where cost matters more than UV re-programmability. UV erasure requires 20-30 minutes of exposure to a 254 nm UV lamp at the rated intensity.
The PIC17C44 operates from a single 5V supply (VDD) and draws low quiescent current due to its CMOS process. Estimated: at 33 MHz the core current is approximately 20-30 mA typical. Place 100 nF decoupling capacitors as close as possible to each VDD/VSS pair (pins 11/10 and 40/39) to suppress switching noise that could otherwise couple into the analog reference or oscillator circuits.
Keep the oscillator traces (OSC1, OSC2) short and surround them with a ground guard ring to minimize EMI pickup on the clock signal. The MCLR pin (pin 9) requires a 10 kohm pull-up to VDD; place this resistor close to the pin. If using ICSP (In-Circuit Serial Programming), reserve RB6/PGC and RB7/PGD for programming access and do not load them with high-current peripherals in the final design.
The PIC17C44/JW is rated for commercial temperature grade (0C to +70C); for industrial environments select the -I/JW variant. The CERDIP package provides better thermal performance than PDIP for the same die, but sustained junction temperatures above 125C will degrade EPROM retention. Estimated: typical junction-to-ambient thermal resistance of CERDIP-40 is approximately 50 C/W.
Thông tin tuân thủ
CERDIP package with through-hole leads is typically non-RoHS due to lead-based termination finish. Industrial -I/JW variant available for extended temperature. Conflict-minerals compliance per Microchip standard disclosure.
