PIC17LC44T-08/PT - 8-Bit 8MHz 16KB OTP MCU 44-TQFP | Microchip
MPN: PIC17LC44T-08/PT ✓ Hoạt độngPIC17LC44T-08/PT Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, program memory, working RAM, digital I/O, and on-chip peripherals such as timers, capture/compare modules, and a synchronous/asynchronous serial port. The PIC17C family sits between the PIC16 baseline/enhanced and the PIC18 families in the broader PIC microcontroller taxonomy (PIC10/12 -> PIC16 -> PIC17 -> PIC18 -> PIC24/dsPIC -> PIC32), targeting higher-performance 8-bit control with a 16-bit wide instruction word and an external data bus option.
Key features of the PIC17LC44T-08/PT include its 33 I/O lines, on-chip RC oscillator option, hardware USART, multiple timer modules, and the PIC17 family's hardware multiply support. The OTP program memory provides one-time field programmability, making the part economical for production volumes where the firmware is stable. The wide 2.5 V to 5.0 V supply range lets the device drop into both 3.3 V and 5 V designs without a separate regulator, simplifying BOM and PCB area.
Architecturally, the PIC17LC44 uses a Harvard structure with a 16-bit instruction word fetched from program memory while an 8-bit data path moves operands through the file register space. The 454-byte RAM is partitioned into general-purpose registers and special-function registers controlling ports, timers, and the USART. The dual-cycle branch and table-read/write operations are masked by branch prediction and by grouping table look-ups outside time-critical paths in typical C-coded firmware.
Typical applications include industrial control front-ends, low-cost motor and solenoid drivers, white goods and appliance user-interface controllers, sensor signal conditioning front-ends, and embedded control boards for HVAC and small automation. The commercial temperature grade and tape-and-reel packaging make it suitable for high-volume factory assembly lines.
When designing with this part, confirm that the chosen programmer (e.g. PICSTART Plus, MPLAB PM3, or a third-party Gang programmer) supports OTP blank devices, and verify whether a windowed (UV-erasable) version is required for development. The 33 I/O count and 454-byte RAM limit large table-driven applications, so designers building state-machine-heavy code should budget RAM headroom before locking the firmware.
This page synthesizes distributor pricing, same-brand drop-in alternatives in the PIC17C family, and practical OTP-MCU design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho PIC17LC44T-08/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 PIC17LC44T-08/PT (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Data Bus Width, RoHS Status, Core Architecture.
PIC17LC44-08/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17LC44T-08I/PT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17LC44-08I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17LC44-08I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC17LC44T-08/PT Tỷ lệ tối đa & tính chất điện
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC17LC44 |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 454 bytes |
| Maximum Clock Speed | 8 MHz |
| Instruction Cycle Time | 121 ns (single cycle, 4-clock) |
| Number of I/O Pins | 33 |
| Supply Voltage Range | 2.5 V to 5.0 V |
| Bề rộng đường dữ liệu | 16 Bit (instruction) / 8 Bit (data) |
| Number of Instructions | 58 single-word instructions |
| Package Type | 44-pin TQFP (Plastic, Gull-Wing, Surface Mount) |
| Operating Temperature Grade | Commercial |
| Terminal Form | GULL WING |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC17LC44T-08/PT
| 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/AN4 — Port A bit 5 / analog input 4 |
| Chân 7 | OSC1/CLKIN — Oscillator input / external clock |
| Chân 8 | OSC2/CLKOUT — Oscillator output |
| Chân 9 | MCLR — Master clear reset input (active low) |
| Chân 10 | VDD — Positive supply voltage |
| Chân 11 | VSS — Ground reference |
| 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 — Port B bit 6 |
| Chân 19 | RB7 — Port B bit 7 |
| Chân 20 | VDD — Positive supply voltage |
| Chân 21 | VSS — Ground reference |
| Chân 22 | RC0 — Port C bit 0 |
| Chân 23 | RC1 — Port C bit 1 |
| Chân 24 | RC2 — Port C bit 2 |
| Chân 25 | RC3 — Port C bit 3 |
| Chân 26 | RC4 — Port C bit 4 |
| Chân 27 | RC5 — Port C bit 5 |
| Chân 28 | RC6 — Port C bit 6 |
| Chân 29 | RC7 — Port C bit 7 |
| Chân 30 | RD0 — Port D bit 0 / external memory data bit 0 |
| Chân 31 | RD1 — Port D bit 1 / external memory data bit 1 |
| Chân 32 | RD2 — Port D bit 2 / external memory data bit 2 |
| Chân 33 | RD3 — Port D bit 3 / external memory data bit 3 |
| Chân 34 | RD4 — Port D bit 4 / external memory data bit 4 |
| Chân 35 | RD5 — Port D bit 5 / external memory data bit 5 |
| Chân 36 | RD6 — Port D bit 6 / external memory data bit 6 |
| Chân 37 | RD7 — Port D bit 7 / external memory data bit 7 |
| Chân 38 | RE0/RD — Port E bit 0 / external memory read strobe |
| Chân 39 | RE1/WR — Port E bit 1 / external memory write strobe |
| Chân 40 | RE2/CS — Port E bit 2 / external memory chip select |
| Chân 41 | VDD — Positive supply voltage |
| Chân 42 | VSS — Ground reference |
| Chân 43 | RF0 — Port F bit 0 |
| Chân 44 | RF1 — Port F bit 1 |
Ứng dụng tiêu biểu
PIC17LC44T-08/PT phù hợp cho 6 Áp dụngs: Industrial Control Front-End, Appliance User-Interface Controller, Low-Cost Motor and Solenoid Driver Board, Sensor Signal Conditioning Front-End, HVAC Control Board, Embedded Control Board for Small Automation.
Industrial Control Front-End
The PIC17LC44T-08/PT fits industrial control front-ends where 33 I/O lines, 16 KB OTP, and 454-byte RAM are sufficient to scan keypads, drive LED or character-LCD indicators, and read a handful of sensor inputs. Its 2.5-5.0 V supply range lets the same PCB accept a 24 V->5 V LDO or a 3.3 V rail without rework. The PIC17C core's 121 ns instruction cycle supports polling loops at 1-2 kHz, enough for slow control loops. Compared with newer PIC18F parts, the OTP memory is acceptable for stable, well-validated firmware in long-life industrial products where field firmware updates are rare.
Được đề xuất
Appliance User-Interface Controller
White-goods and small appliance user interfaces benefit from the PIC17LC44T-08/PT's 33 I/O pins (enough for a 4x4 keypad plus 7-segment display or character LCD) and 16 KB OTP for menu-handling firmware. The 454-byte RAM supports small look-up tables for timer presets and mode selection without paging. Wide 2.5-5.0 V supply lets the MCU share the appliance's existing 5 V rail directly. The commercial temperature grade suits indoor appliance environments, while the 'I' variant extends to harsher garage/workshop appliances. Source: Microchip PIC17C44 family application notes.
Được đề xuất
Low-Cost Motor and Solenoid Driver Board
Small brushed-DC motor and solenoid driver boards pair a PIC17LC44T-08/PT with external MOSFET or Darlington drivers. The 33 I/O pins handle direction, enable, brake, current-sense comparator inputs, and tachometer feedback. The 121 ns instruction cycle supports simple PID loops at a few kHz update rate, adequate for low-speed positioning tasks. The OTP memory prevents accidental field reprogramming - a desirable property for safety-rated appliance and automation equipment where firmware integrity must be guaranteed at production time.
Được đề xuất
Sensor Signal Conditioning Front-End
The PIC17LC44T-08/PT acts as a sensor signal conditioning front-end for multi-channel analog or digital sensors in HVAC, building automation, and small process-control products. The wide 2.5-5.0 V supply lets the MCU share a sensor-bus 5 V or 3.3 V rail directly. The on-chip timers and capture/compare peripherals measure pulse-width or frequency-output sensors (e.g. flow meters, anemometers) without external counters. Combined with 16 KB OTP and 454 B RAM, the device handles 10-30 sensor channels with linearization tables in firmware.
Được đề xuất
HVAC Control Board
In HVAC control boards (fan control, damper actuators, thermostat hubs), the PIC17LC44T-08/PT provides sufficient I/O for relay outputs, thermistor inputs, keypad, and LCD. The commercial temperature grade covers indoor air-handler enclosures. The wide supply range lets the MCU share 5 V with relay coils via a simple regulator. The 16 KB OTP memory is well-matched to legacy HVAC firmware that has been stable for years. Source: Microchip PIC17C44 family datasheet thermal and AC characteristics.
Được đề xuất
Embedded Control Board for Small Automation
Small automation controllers (conveyor segments, packaging machines, dispenser timers) use the PIC17LC44T-08/PT as the central logic device. The 33 I/O count supports a handful of digital inputs and outputs per machine module, while the 8 MHz clock handles modest sequencing logic with 121 ns cycle time. The OTP memory eliminates accidental firmware corruption in dusty industrial environments where stray voltage spikes are possible. The 44-TQFP package is compatible with standard SMT assembly lines, lowering per-unit manufacturing cost.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC17LC44T-08/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 | PIC17LC44-08/PT | PIC17LC44T-08I/PT | PIC17LC44-08I/L | PIC17LC44-08I/P |
|---|---|---|---|---|---|
| Package | 44-pin TQFP (Tape & Reel) | 44-pin TQFP (Tray) - same | 44-pin TQFP - same | 44-pin LQFP - same | 44-pin TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-Bit PIC17 | 8-Bit PIC17 | 8-Bit PIC17 | 8-Bit PIC17 | 8-Bit PIC17 |
| Program Memory | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP | 16 KB OTP |
| RAM | 454 bytes | 454 bytes | 454 bytes | 454 bytes | 454 bytes |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage | 2.5 V to 5.0 V | 2.5 V to 5.0 V | 2.5 V to 5.0 V | 2.5 V to 5.0 V | 2.5 V to 5.0 V |
| Temperature Grade | Commercial | Commercial | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) | Industrial (-40 C to +85 C) |
Bảo phân biệt quan trọng
- Tape-and-Reel packaging for high-volume SMT assembly (vsPIC17LC44-08/PT (Tray))
- Commercial temperature grade for cost-sensitive indoor products (vsPIC17LC44T-08I/PT (Industrial -40 C to +85 C))
- Wide 2.5 V to 5.0 V supply for flexible power design (vsPIC17C44T-25I/PQ (4.5 V to 5.5 V, 25 MHz))
Ghi chú thiết kế
PIC17LC44T-08/PT uses One-Time-Programmable (OTP) memory, so firmware bugs discovered after programming cannot be fixed by re-flashing. Always validate firmware on a JW (windowed) or FLASH-based PIC18/dsPIC equivalent before committing to OTP production. A single bad batch can scrap thousands of units. Confirm with Microchip whether a 'verify-only' or 'program-and-verify' cycle is supported by your programmer for OTP devices to avoid partial programming failures.
Place a 0.1 uF decoupling capacitor as close as possible to each VDD pin (the 44-TQFP has three VDD pins at positions 10, 20, and 41). Add a bulk 10 uF tantalum or aluminum polymer cap on the supply rail. The PIC17LC44T-08/PT supply range is 2.5 V to 5.0 V - confirm that any brown-out detection thresholds are set within this range via the configuration bits. Brown-out is highly recommended for industrial environments where supply transients can corrupt registers or program memory during write cycles.
The 44-pin TQFP package has a 0.80 mm pitch and a 10x10 mm body with an exposed thermal pad (die-attach paddle) tied to VSS. Route the exposed pad to a continuous ground pour for mechanical stability and thermal dissipation. Keep the MCLR trace short and add a 10 kohm pull-up plus a 100 nF cap to VDD for noise-immune reset. Place the crystal/oscillator traces within 10 mm of OSC1/OSC2 with a ground guard ring to reduce EMI susceptibility.
For external-memory-bus applications using ports D and E, keep the bus traces short (<50 mm) and matched in length to avoid timing skew at 8 MHz. Add 33 ohm series-termination resistors at the bus driver outputs if the bus is heavily loaded. The 121 ns instruction cycle leaves only ~33 ns of setup margin at 8 MHz, so any bus reflections can cause intermittent read errors. Place a ground pour under the bus area to control characteristic impedance.
Thông tin tuân thủ
RoHS compliance per Microchip product page. Not AEC-Q100 qualified - this is a commercial-grade MCU. Halogen-free status not explicitly stated in verified web data.
