PIC17C44-25/PQ - 8-Bit 25MHz OTP MCU 16KB | Microchip
MPN： PIC17C44-25/PQ ⚠ 最後購買機會PIC17C44-25/PQ 概覽
An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, program memory, peripherals, and I/O on one die, designed to execute embedded control tasks in deterministic cycles. PIC17C parts belong to Microchip's mid-range PIC family, positioned between the PIC16C baseline and PIC18 enhanced cores, with the PIC17C being one of the earliest families to introduce a 16-bit program word and a 16-bit instruction set while retaining an 8-bit data path. Modern replacements like PIC18F442 share the 40/44-pin footprint but migrate to Flash memory.
Key specifications include a maximum clock of 25 MHz delivering 121 ns instruction execution, an internal multiplier, multiple timer/counter modules, a USART, and a 12-bit instruction word addressed across 16 KB of OTP. The device supports up to 33 I/O pins and operates from a single 5 V supply. Compared with PIC16C5X predecessors, the PIC17C44 adds a hardware multiplier, expanded interrupt controller, and a 16-level hardware stack, while preserving source-level compatibility for code migrated from PIC16C and PIC12C families.
Architecturally, the PIC17C44 uses a Harvard bus with separate program and data paths, enabling single-cycle instruction fetch plus one or two data cycles. The OTP memory is factory- or user-programmed once, providing low per-unit cost in mature production runs but limiting field upgrades. A 25 MHz oscillator and PLL option define the maximum instruction rate; the '25' speed suffix confirms 25 MHz operation versus the 16 MHz '-16' grade.
Typical applications include industrial motor control, embedded instrumentation, sensor interfaces, automotive body controllers (legacy), and consumer appliance controllers where deterministic 8-bit control is sufficient. The 44-MQFP footprint also makes it compatible with a broad set of legacy PIC17C/CR sockets when migrating to flash-based PIC18F442 in redesigns. When designing with this part, validate OTP programming flow before committing to a production run - unlike Flash, OTP cannot be reprogrammed and every unit must be discarded for firmware errors.
直接替換替代品，適用於 PIC17C44-25/PQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC17C44-25/PQ （相同外形與佔位） — 差異在於 Package, Operating Temperature, Maximum Clock Frequency, Program Memory Size, Program Memory Type.
PIC17C44-25I/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C44T-25I/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC17C44T-25/PQ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC17C44-16I/PQ
✅ 直接替換聯絡詢價
查看資料表 →PIC17C43-25/PQ
✅ 直接替換📋 參考替代品（不在目錄中）
PIC17C44-25/PQ 最大額定值與電氣特性
| Core Architecture | PIC 8-bit RISC |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 16 KB (8K x 16) |
| RAM Size | 454 bytes |
| 最大時脈頻率 | 25 MHz |
| Instruction Execution Time | 121 ns (8.25 MIPS) |
| 資料匯流排寬度 | 8-bit |
| Number of I/O Pins | 33 |
| 封裝 | 44-MQFP (10x10 mm) |
| 安裝類型 | Surface Mount |
| Instruction Set Size | 58 single-word instructions |
PIC17C44-25/PQ 腳位配置
| 腳位 1 | MCLR — Master Clear (Reset) input |
| 腳位 2 | RA0/AN0 — Port A bit 0 / analog input 0 |
| 腳位 3 | RA1/AN1 — Port A bit 1 / analog input 1 |
| 腳位 4 | RA2/AN2 — Port A bit 2 / analog input 2 |
| 腳位 5 | RA3/AN3 — Port A bit 3 / analog input 3 |
| 腳位 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| 腳位 7 | RA5/SS — Port A bit 5 / SPI slave select |
| 腳位 8 | OSC1 — Crystal oscillator input |
| 腳位 9 | OSC2 — Crystal oscillator output |
| 腳位 10 | RC0 — Port C bit 0 |
| 腳位 11 | RC1 — Port C bit 1 |
| 腳位 12 | RC2 — Port C bit 2 |
| 腳位 13 | RC3 — Port C bit 3 |
| 腳位 14 | RC4 — Port C bit 4 |
| 腳位 15 | RC5 — Port C bit 5 |
| 腳位 16 | RC6 — Port C bit 6 |
| 腳位 17 | RC7 — Port C bit 7 |
| 腳位 18 | VSS — Ground |
| 腳位 19 | VDD — Positive supply (+5V) |
| 腳位 20 | VSS — Ground |
| 腳位 21 | RB0/INT — Port B bit 0 / external interrupt |
| 腳位 22 | RB1 — Port B bit 1 |
| 腳位 23 | RB2 — Port B bit 2 |
| 腳位 24 | RB3 — Port B bit 3 |
| 腳位 25 | RB4 — Port B bit 4 |
| 腳位 26 | RB5 — Port B bit 5 |
| 腳位 27 | RB6 — Port B bit 6 |
| 腳位 28 | RB7 — Port B bit 7 |
| 腳位 29 | RD0 — Port D bit 0 |
| 腳位 30 | RD1 — Port D bit 1 |
| 腳位 31 | RD2 — Port D bit 2 |
| 腳位 32 | RD3 — Port D bit 3 |
| 腳位 33 | RD4 — Port D bit 4 |
| 腳位 34 | RD5 — Port D bit 5 |
| 腳位 35 | RD6 — Port D bit 6 |
| 腳位 36 | RD7 — Port D bit 7 |
| 腳位 37 | RE0 — Port E bit 0 (PIC17C44 44-pin only) |
| 腳位 38 | RE1 — Port E bit 1 (PIC17C44 44-pin only) |
| 腳位 39 | RE2 — Port E bit 2 (PIC17C44 44-pin only) |
| 腳位 40 | NC — Not connected (per datasheet) |
| 腳位 41 | NC — Not connected (per datasheet) |
| 腳位 42 | NC — Not connected (per datasheet) |
| 腳位 43 | NC — Not connected (per datasheet) |
| 腳位 44 | NC — Not connected (per datasheet) |
典型應用
PIC17C44-25/PQ 適用於 6 應用s: Industrial Motor Control, Embedded Sensor Instrumentation, Automotive Body Controllers (Legacy), Consumer Appliance Controllers, Point-of-Sale Terminals and Printers, Industrial Control Panels and HMI.
Industrial Motor Control
The PIC17C44-25/PQ's 25 MHz clock (8.25 MIPS) and hardware multiplier make it well suited to single-axis BLDC or stepper motor control loops where deterministic 121 ns instruction execution and a 16-bit program word simplify PID math. Its 33 I/O pins connect directly to gate drivers, Hall sensors, and quadrature encoders without external logic. The 44-MQFP footprint supports surface-mount production lines for industrial drives. Trade-off: OTP memory prevents firmware updates, so the PID gains and commutation tables must be validated before programming. Pair with IR2110 gate drivers and ACS712 current sensors for a complete 3-phase inverter reference design.
推薦
Embedded Sensor Instrumentation
The PIC17C44-25/PQ's 454-byte RAM and 33 I/O let it aggregate multiple analog/digital sensors (temperature, pressure, flow) and drive an LCD or UART output. The Harvard bus and 121 ns cycle time keep ADC read latency predictable for time-stamped data logging. The 44-MQFP exposes enough pins to run an external 12-bit ADC like MCP3201 in parallel with a serial EEPROM for data storage. Trade-off: 454-byte RAM caps log depth, so use circular buffering to external SPI flash. For battery-powered instruments, however, PIC17C is not ideal - consider PIC18LF or PIC24F for low-power sleep modes.
推薦
Automotive Body Controllers (Legacy)
The PIC17C44-25/PQ's 33 I/O and 5 V operation historically drove automotive body modules (window lifters, mirror controllers, simple HVAC flaps) in late-1990s/early-2000s designs. The 25 MHz throughput handles LIN-bus-style UART traffic and debounced switch matrices. However, this is NOT an AEC-Q100 qualified part - modern automotive designs should use PIC18F46K22 or dsPIC33 families with full automotive qualification. Use the PIC17C44-25/PQ only for maintaining legacy production, not for new automotive programs.
推薦
Consumer Appliance Controllers
The PIC17C44-25/PQ's 16 KB OTP and 33 I/O drive washing-machine, dishwasher, and microwave user-interface boards where per-unit cost matters more than field upgradeability. The 5 V rail and 25 MHz clock comfortably handle keypad scanning, 7-segment or character-LCD multiplexing, and triac-fired heater/valve control via zero-cross interrupts. With OTP pricing around $7-15/unit at volume, BOM cost stays low for high-volume appliances. Trade-off: every firmware bug requires a tooling change, so pre-production validation must be exhaustive.
推薦
Point-of-Sale Terminals and Printers
The PIC17C44-25/PQ's USART and 16 KB OTP handle legacy POS terminal and receipt-printer logic, including keypad scan, LCD update, and serial communication to a host or fiscal printer. The 25 MHz throughput keeps print-head stepper and paper-feed motor control in real time. Many legacy POS designs used PIC17C44 because its 8-bit Harvard architecture gave deterministic print timing without RTOS overhead. Modern replacements (PIC18F452, PIC24FJ) add Flash and USB, but PIC17C44-25/PQ remains serviceable for spare-part channels. Trade-off: no USB peripheral, so external UART-to-USB bridges are required for PC connectivity.
推薦
Industrial Control Panels and HMI
The PIC17C44-25/PQ's 33 I/O and 25 MHz clock drive small industrial HMI panels with pushbuttons, LED indicators, and 4x4 or 4x5 keypads, plus character-LCD or low-resolution graphic displays. The hardware multiplier accelerates button-debounce filters and rotary-encoder quadrature decoding. The 44-MQFP allows the panel PCB to integrate RS-232/RS-485 transceivers directly. Trade-off: with only 454 bytes RAM, complex multi-screen menu stacks must use compact state machines. For new designs, PIC18F4520 or PIC18F46K22 in the same footprint offer Flash reprogramming and modern peripherals.
推薦
推薦產品摘要
工程參考資料，適用於 PIC17C44-25/PQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC17C44-25I/PQ | PIC17C44T-25I/PQ | PIC17C44T-25/PQ | PIC17C44-16I/PQ | PIC17C43-25/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 25 MHz | 16 MHz | 25 MHz |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial | Industrial (-40C to +85C) | Commercial |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Packaging Form | Tray | Tray | Tape and Reel | Tape and Reel | Tray | Tray |
主要差異化特點
- 25 MHz speed grade delivers 8.25 MIPS, 56% more throughput than 16 MHz variants (對比PIC17C44-16/PQ)
- True drop-in temperature upgrade path to industrial range (對比PIC17C44-25I/PQ)
- 44-MQFP surface-mount package for high-volume SMT production (對比PIC17C44-25/P (40-PDIP))
設計說明
OTP memory cannot be reprogrammed. Per Microchip datasheet 30412c, every firmware revision after mask release requires a new part number. Pre-production validation must be exhaustive - use a PIC17C44 Flash equivalent (e.g. PIC18F452 in compatible footprint) for firmware development and finalize code before committing to PIC17C44-25/PQ production. Build a parallel test fixture so failed units can be re-analyzed in circuit.
PIC17C44 operates from a single +5V supply (typical VDD 4.5-5.5V). Decouple VDD with 100 nF ceramic + 10 uF tantalum placed within 25 mm of the supply pins. Brown-out detection is implemented via the BOR fuse setting in the configuration word - enable it for industrial applications to avoid indeterminate operation below 4.0 V. Estimated: at 25 MHz the core draws ~15-25 mA, peaking on external memory accesses.
Keep the 25 MHz crystal traces short and surrounded by a ground guard ring. Place MCLR pull-up (typically 10 kohm to VDD) close to the pin. For the 44-MQFP, the inner paddle is typically not connected on PIC17C44 (verify against datasheet mechanical section); route ground and VDD on inner copper pours with via stitching every 5 mm to control impedance and EMI.
MCLR must rise cleanly with a monotonic edge faster than 1 us; long RC time constants can trigger false resets on noisy industrial lines. Add a 100 nF ceramic across the MCLR pull-up to filter high-frequency noise. For USART-driven designs at 25 MHz, the 0.8% instruction-cycle jitter at 115200 baud is acceptable; verify baud-rate error budget against the electrical characteristics table for higher speeds.
合規資訊
Compliance data not explicitly stated in the verified web sources. As a mature OTP part from the late 1990s/early 2000s, this device may predate widespread RoHS/REACH documentation. Confirm with Microchip directly for new designs requiring compliance certification.
