PIC16C745-I/SO - 8-Bit 24MHz USB MCU, 14KB OTP, 28-SOIC | Microchip
料号： PIC16C745-I/SO ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.68 | $66.80 |
| 100 | $5.95 | $595.00 |
| 500 | $5.31 | $2,655.00 |
| 1,000 | $4.78 | $4,780.00 |
PIC16C745-I/SO 概述
An 8-bit microcontroller (MCU) is a single-chip microprocessor optimized for embedded control, integrating CPU, memory, and peripherals. Within the broader taxonomy, the PIC16C745 belongs to: microcontroller -> 8-bit MCU -> PIC16 family -> PIC16C7x sub-family -> USB-capable PIC16C. Its RISC architecture with 35 single-word instructions simplifies firmware development, while the Harvard memory bus allows simultaneous instruction and data access for deterministic throughput.
Key differentiating features include USB 1.1 Low-Speed certification (a notable differentiator at this 8-bit tier), 5 channels of 8-bit Analog-to-Digital (A/D) conversion, a USART/SCI serial port, and a programmable Watchdog Timer. The OTP program memory allows one-time factory or in-circuit programming, making the part economical for medium-volume production. Operating voltage spans 4.0V to 5.5V from a single 5V rail typical of USB bus-powered designs.
The PIC16C745 uses Microchip's PIC16 RISC core with a 14-bit instruction word. Its 8-level hardware stack and 35-instruction instruction set enable compact code; a single 24 MHz oscillator yields 4 MHz instruction rate (one instruction per four oscillator cycles, or 167 ns per instruction). Internal peripherals include a Universal Synchronous/Asynchronous Receiver Transmitter, an 8-bit A/D converter with five input channels, and standard PIC timer/counter blocks, providing enough capability for human-interface-device (HID) class USB applications.
Typical applications include USB Human Interface Devices such as custom keyboards, mice, and game controllers; low-speed USB peripherals including barcode readers and POS terminals; embedded industrial controllers requiring USB diagnostics ports; legacy PC accessories; and educational/development boards where an easy-to-program USB-capable 8-bit MCU is desired. Its 28-pin SOIC footprint supports hand prototyping and through-hole-style PCB layouts.
When designing with this device, allocate I/O pins carefully because the USB D+/D- lines share package pins; an external pull-up on D- is required for Low-Speed enumeration per USB 1.1 specification. OTP memory cannot be re-programmed, so firmware validation on a windowed or flash-based equivalent is recommended during development.
This page synthesizes distributor pricing, certified USB 1.1 LS capability details, drop-in package-compatible alternatives within the PIC16C family, and practical design notes that complement the manufacturer datasheet.
直接替换替代料： PIC16C745-I/SO ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： PIC16C745-I/SO （相同外形与封装尺寸） ——差异在于 ADC, Package, Core Architecture, Timers, Operating Temperature.
快速对比工具——选择替代料号进行并排对比：
PIC16C745T-I/SO
✅ 直接替换✓ 有现货
$3.65 / 个
查看数据手册 →PIC16F745-I/SO
✅ 直接替换📋 参考替代料（不在目录中）
PIC16C745-I/SP
✅ 直接替换✓ 有现货
$4.12 / 个
查看数据手册 →PIC16C73B-04I/SO
✅ 直接替换✓ 有现货
$7.1 / 个
查看数据手册 →PIC16C73A-10I/SO
✅ 直接替换✓ 有现货
$3.55 / 个
查看数据手册 →PIC16C745-I/SO 最大额定值与电气特性
| Product Type | 8-bit Microcontroller (MCU) |
| Core Architecture | PIC16 (RISC) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14) |
| RAM Size | 256 x 8 bytes |
| Instruction Set Size | 35 single-word instructions |
| Instruction Word Width | 14-bit |
| 最大时钟频率 | 24 MHz |
| Instruction Execution Time | 167 ns (at 24 MHz) |
| Operating Voltage Range | 4.0 V to 5.5 V |
| Number of I/O Pins | 22 |
| ADC | 5 channels, 8-bit |
| USB Interface | USB 1.1 Low-Speed certified |
| Serial Interface | USART / SCI |
| 封装 | 28-pin SOIC (0.295 inch / 7.50 mm body width) |
| 安装类型 | Surface Mount |
| 工作温度范围 | -40 C to +85 C (Industrial) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
PIC16C745-I/SO 引脚配置
| 引脚 1 | MCLR/VPP — Master Clear (reset) input / Programming voltage |
| 引脚 2 | RA0/AN0 — Port A bit 0 / Analog input channel 0 |
| 引脚 3 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
| 引脚 4 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| 引脚 5 | RA3/AN3/VREF — Port A bit 3 / Analog input 3 / ADC reference voltage |
| 引脚 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| 引脚 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| 引脚 8 | OSC1/CLKIN — Oscillator crystal input / external clock input |
| 引脚 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| 引脚 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| 引脚 11 | RC1/T1OSI — Port C bit 1 / Timer 1 oscillator input |
| 引脚 12 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 引脚 13 | RC3 — Port C bit 3 |
| 引脚 14 | RC4/D- — Port C bit 4 / USB D- data line (Low-Speed) |
| 引脚 15 | RC5/D+ — Port C bit 5 / USB D+ data line (Low-Speed) |
| 引脚 16 | RC6/TX/CK — Port C bit 6 / USART TX / clock line |
| 引脚 17 | RC7/RX/DT — Port C bit 7 / USART RX / data line |
| 引脚 18 | RB0/INT — Port B bit 0 / External interrupt |
| 引脚 19 | RB1 — Port B bit 1 |
| 引脚 20 | RB2 — Port B bit 2 |
| 引脚 21 | RB3 — Port B bit 3 |
| 引脚 22 | RB4 — Port B bit 4 |
| 引脚 23 | RB5 — Port B bit 5 |
| 引脚 24 | RB6/PGC — Port B bit 6 / ICSP clock |
| 引脚 25 | RB7/PGD — Port B bit 7 / ICSP data |
| 引脚 26 | VSS — Ground reference |
| 引脚 27 | VDD — Positive supply (4.0V to 5.5V) |
| 引脚 28 | NC — Not connected (per datasheet pinout) |
典型应用
PIC16C745-I/SO 适用于 6 应用s: USB Keyboard HID Controller, USB Barcode Scanner, USB Game Controller / Joystick, Industrial USB Diagnostic Port, USB Mouse / Pointing Device, Educational USB Development Board.
USB Keyboard HID Controller
The PIC16C745-I/SO is purpose-built for USB Human Interface Device class designs such as custom keyboards. Its USB 1.1 Low-Speed certification matches the 1.5 Mbps rate that HID keyboards require per the USB specification. The 14 KB OTP program memory holds keymap tables, debounce logic, and HID report routines for full 104-key matrices, while the 22 I/O pins comfortably drive an 8x16 key scan matrix. Placed as the sole IC on a bus-powered keyboard PCB, the MCU enumerates automatically when the host detects the D- pull-up. Compared with discrete USB implementations using an 8-bit MCU plus FTDI-style bridge, the integrated USB peripheral saves roughly USD 1.50 in BOM and several square millimeters of board area.
推荐
USB Barcode Scanner
Point-of-sale barcode scanners require a USB HID or CDC-class interface that the PIC16C745-I/SO delivers via its USB 1.1 Low-Speed certification. The 24 MHz instruction clock executes the 35-instruction PIC16 instruction set in 167 ns per instruction, allowing real-time decoding of 1D barcode symbologies such as Code 128 and UPC-A. The 5-channel 8-bit A/D converter reads analog sensor outputs from laser or CCD scan engines without an external ADC. The 28-SOIC footprint fits inside the slim scanner housing, and the 4.0-5.5V operating range matches USB VBUS power directly without an additional LDO.
推荐
USB Game Controller / Joystick
Game controllers and joysticks benefit from the PIC16C745-I/SO's USB 1.1 LS HID certification, which provides plug-and-play compatibility with PC and console USB stacks. The 22 digital I/O pins read button matrices and analog joystick potentiometers via the integrated 5-channel 8-bit ADC. The 256-byte RAM buffer holds HID report packets between USB polls, and the 14 KB OTP stores HID descriptors, debounce state machines, and button remapping tables. Compared with custom HID implementations on non-USB PIC16 MCUs, the integrated USB peripheral eliminates 200+ lines of bit-banged USB code and reduces firmware size by approximately 1.5 KB.
推荐
Industrial USB Diagnostic Port
Adding a USB diagnostic port to industrial controllers is straightforward with the PIC16C745-I/SO, which provides USB 1.1 LS connectivity without external transceiver ICs. Industrial equipment operates across wide temperature ranges, and the -40 C to +85 C industrial temperature grade matches factory-floor environments. The MCU can sit on a daughter board that taps the host controller's 5V rail and exposes service logs, fault codes, or firmware updates over USB HID or CDC. Compared with adding a full-speed USB controller, the LS-certified PIC16C745 reduces BOM cost by 40% while delivering sufficient bandwidth for telemetry and configuration channels.
推荐
USB Mouse / Pointing Device
USB mice and pointing devices use the PIC16C745-I/SO to handle USB 1.1 LS enumeration and HID mouse reporting. The 5-channel 8-bit ADC reads the optical sensor's analog motion signals, while the 22 I/O pins accommodate additional buttons, scroll wheels, and DPI selectors. The 24 MHz clock and 167 ns instruction execution provide sufficient throughput for 500 Hz to 1000 Hz mouse report rates commonly used in gaming peripherals. Compared with specialized mouse-controller ICs, the general-purpose PIC16C745 allows custom firmware that integrates macro recording or wireless dongle logic on the same silicon.
推荐
Educational USB Development Board
Universities and training programs use the PIC16C745-I/SO to teach USB protocol fundamentals because it integrates USB 1.1 LS support on a familiar PIC16 RISC core with the 35-instruction instruction set. Students learn enumeration, HID descriptors, and interrupt-driven USB transfers without the complexity of external transceivers. The 28-SOIC package is breadboard-compatible via SOIC-to-DIP adapters, while the 4.0-5.5V supply range allows direct USB bus powering. Compared with full-speed USB microcontrollers, the LS-capable PIC16C745 keeps assembly-language exercises tractable, with each subsystem including advanced peripherals such as timers and A/D converters for full embedded systems curricula.
推荐
推荐产品汇总
工程参考数据： PIC16C745-I/SO ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PIC16C745T-I/SO | PIC16F745-I/SO | PIC16C745-I/SP | PIC16C73B-04I/SO | PIC16C73A-10I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC | 28-SOIC | 28-SOIC (SPDIP through-hole, same pinout) | 28-SOIC | 28-SOIC |
| Program Memory Type | OTP (14 KB) | OTP (14 KB) | Flash (14 KB) | OTP (14 KB) | OTP (4 KB) | OTP (4 KB) |
| Maximum Clock Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 4 MHz | 10 MHz |
| USB Interface | USB 1.1 Low-Speed certified | USB 1.1 Low-Speed certified | USB 1.1 Low-Speed certified | USB 1.1 Low-Speed certified | None | None |
| RAM Size | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 192 bytes | 128 bytes |
| Number of I/O Pins | 22 | 22 | 22 | 22 | 22 | 22 |
| ADC Channels | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit | 5 x 8-bit |
关键差异点
- Integrated USB 1.1 Low-Speed certified peripheral （对比 PIC16C73B-04I/SO)
- Four times more program memory than PIC16C73A （对比 PIC16C73A-10I/SO)
- Higher clock speed than PIC16C73A variants （对比 PIC16C73A-10I/SO)
设计说明
Place a 1.5 kOhm pull-up resistor on the USB D- line (pin 14, RC4) to signal Low-Speed device presence to the USB host per USB 1.1 specification. Keep the D+/D- traces short and matched in length (within 2 mm) to maintain signal integrity at 1.5 Mbps. Add 100 nF decoupling on VDD (pin 27) and a 10 uF bulk capacitor near the USB VBUS input to suppress switching transients during host enumeration. Estimated: signal integrity at LS USB is tolerant of moderate trace mismatches but violated D- pull-up placement is the most common cause of enumeration failures.
OTP program memory cannot be erased or rewritten. Validate firmware on a windowed or Flash-equivalent part (e.g., PIC16F745-I/SO with same pinout) before committing to OTP volume production. If a code bug is found post-production, the silicon must be discarded. Budget firmware development time for at least one full prototype cycle on Flash silicon before locking the OTP order.
The 28-SOIC package has a thermal resistance of approximately 50-60 C/W, which is acceptable because the PIC16C745 typically consumes under 50 mW. Provide at least 100 mils of copper around the VDD pin for thermal spreading and adequate ground plane under the device. Keep the 24 MHz crystal within 5 mm of OSC1/OSC2 (pins 8/9) with short traces to minimize parasitic capacitance that could shift the oscillator off-frequency. A series resistor on MCLR/VPP (pin 1) of 10 kOhm prevents programming voltage transients during in-circuit serial programming.
合规信息
RoHS compliant per Microchip product page. USB 1.1 Low-Speed compliance certified by USB-IF. Halogen-free status not stated in verified data; AEC-Q100 not applicable (industrial/commercial MCU, not automotive qualified).
