PIC16C74AT-10/PQ - 8-bit 10MHz OTP MCU 7KB | Microchip
MPN: PIC16C74AT-10/PQ ✗ انتهى عمره الإنتاجيPIC16C74AT-10/PQ نظرة عامة
What is an 8-bit OTP microcontroller? An OTP (One-Time Programmable) MCU is a microcontroller whose program memory can be written exactly once after manufacture, typically using a parallel or serial programmer, after which the code becomes permanent. The 8-bit designation refers to the width of the ALU and the data bus, while the 10MHz rating is the maximum oscillator input frequency that drives the instruction pipeline. OTP MCUs sit in the hierarchy: microcontroller -> embedded controller -> semiconductor IC, and they are widely used in cost-sensitive, high-volume consumer and industrial products.
Key features include 33 digital I/O pins, integrated 8-bit A/D converter channels, Brown-out Detect/Reset, Power-On Reset (POR), Pulse Width Modulation (PWM), Watchdog Timer (WDT), and serial connectivity through I2C, SPI, and UART/USART peripherals. The 10MHz instruction rate delivers roughly 5 MIPS, with each instruction cycle taking four oscillator clocks in the PIC mid-range architecture.
The device uses a Harvard architecture with separate program and data buses, a 14-bit wide instruction word, and a RISC instruction set with only 35 single-word instructions to simplify firmware development. The CMOS process provides low power consumption with a 4V to 6V supply range (typical Vcc = 5V), making the part suitable for both battery- and line-powered embedded systems.
Typical applications include industrial control boards, motor drive interfaces, instrumentation front-ends, automotive body electronics (non-safety subsystems), and legacy embedded products that were designed around the PIC16C7X family. The 44-pin MQFP footprint also simplifies migration to PIC16F74A flash-based successors when re-programmability becomes necessary.
When designing with this part, note that the OTP memory prevents field firmware updates, so production firmware must be fully validated before programming. Decoupling and a stable oscillator layout are critical because the integrated A/D converter is sensitive to supply and clock noise.
This page synthesizes distributor pricing, drop-in same-brand alternatives, comparison data, and practical design notes that go beyond what the original Microchip datasheet provides in isolation.
بدائل مباشرة لـ PIC16C74AT-10/PQ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع PIC16C74AT-10/PQ (نفس عامل الشكل والبصمة) — يختلف في Package, Program Memory Size, Program Memory Type, A/D Converter, Core Architecture.
PIC16C74A-10/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74A-20/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74A-20I/L
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74A-20E/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16C74A-04/PQ
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←PIC16F74A-I/PQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
PIC16C74AT-10/PQ الحدود القصوى والخصائص الكهربائية
| Core | PIC16 mid-range RISC, 8-bit |
| Instruction Set Width | 14-bit |
| Number of Instructions | 35 |
| أقصى تردد للساعة | 10 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 x 8 bytes |
| Supply Voltage (Vcc) | 4 V to 6 V (5 V typical) |
| Number of I/O Pins | 33 |
| العلبة | 44-pin MQFP (10x10 mm) |
| نوع التركيب | Surface Mount (Gull Wing) |
| A/D Converter | 8-bit integrated |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Temperature Grade | Commercial |
| درجة حرارة التشغيل | 0C to +70C (commercial) |
تكوين أطراف PIC16C74AT-10/PQ
| دبوس 1 | OSC1/CLKIN — Oscillator input or external clock input |
| دبوس 2 | OSC2/CLKOUT — Oscillator output |
| دبوس 3 | MCLR — Master Clear (reset) input, active low |
| دبوس 4 | RA0/AN0 — PORTA bit 0 / analog input 0 |
| دبوس 5 | RA1/AN1 — PORTA bit 1 / analog input 1 |
| دبوس 6 | RA2/AN2 — PORTA bit 2 / analog input 2 |
| دبوس 7 | RA3/AN3/VREF — PORTA bit 3 / analog input 3 / VREF+ |
| دبوس 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| دبوس 9 | RA5/AN4/SS — PORTA bit 5 / analog input 4 / SPI slave select |
| دبوس 10 | Vss — Ground reference |
| دبوس 11 | Vdd — Positive supply voltage (4V to 6V) |
| دبوس 12 | RB0/INT — PORTB bit 0 / external interrupt |
| دبوس 13 | RB1 — PORTB bit 1 |
| دبوس 14 | RB2 — PORTB bit 2 |
| دبوس 15 | RB3 — PORTB bit 3 |
| دبوس 16 | RB4 — PORTB bit 4 |
| دبوس 17 | RB5 — PORTB bit 5 |
| دبوس 18 | RB6/PGC — PORTB bit 6 / ICSP clock |
| دبوس 19 | RB7/PGD — PORTB bit 7 / ICSP data |
| دبوس 20 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 I/O |
| دبوس 21 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 OSC / CCP2 |
| دبوس 22 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| دبوس 23 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| دبوس 24 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| دبوس 25 | RC5/SDO — PORTC bit 5 / SPI data out |
| دبوس 26 | RC6/TX/CK — PORTC bit 6 / UART TX / USART clock |
| دبوس 27 | RC7/RX/DT — PORTC bit 7 / UART RX / USART data |
| دبوس 28 | RD0/PSP0 — PORTD bit 0 / parallel slave port |
| دبوس 29 | RD1/PSP1 — PORTD bit 1 / parallel slave port |
| دبوس 30 | RD2/PSP2 — PORTD bit 2 / parallel slave port |
| دبوس 31 | RD3/PSP3 — PORTD bit 3 / parallel slave port |
| دبوس 32 | RD4/PSP4 — PORTD bit 4 / parallel slave port |
| دبوس 33 | RD5/PSP5 — PORTD bit 5 / parallel slave port |
| دبوس 34 | RD6/PSP6 — PORTD bit 6 / parallel slave port |
| دبوس 35 | RD7/PSP7 — PORTD bit 7 / parallel slave port |
| دبوس 36 | RE0/RD/AN5 — PORTE bit 0 / read control / analog input 5 |
| دبوس 37 | RE1/WR/AN6 — PORTE bit 1 / write control / analog input 6 |
| دبوس 38 | RE2/CS/AN7 — PORTE bit 2 / chip select / analog input 7 |
| دبوس 39 | Vdd — Positive supply voltage (second Vdd) |
| دبوس 40 | Vss — Ground reference (second Vss) |
| دبوس 41 | NC — Not connected (per datasheet) |
| دبوس 42 | NC — Not connected (per datasheet) |
| دبوس 43 | NC — Not connected (per datasheet) |
| دبوس 44 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
PIC16C74AT-10/PQ مناسب لـ 6 التطبيقs: Industrial Control Boards, Motor Drive and PWM Control, Instrumentation and Data Acquisition Front-Ends, Automotive Body Electronics (Non-Safety), Legacy Consumer Embedded Products, Educational and Hobby Electronics.
Industrial Control Boards
The PIC16C74AT-10/PQ fits industrial control applications because its 33 digital I/O lines, integrated 8-bit ADC, and PWM peripheral provide direct interfacing to sensors, relays, and motor drivers without external glue logic. The 10MHz instruction rate yields roughly 5 MIPS, more than adequate for PLC-style ladder replacement, encoder reading, and HMI keypad scanning. The 4V to 6V supply range tolerates regulated 5V industrial rails, and the Brown-out Detect/Reset plus Watchdog Timer safeguard unattended operation on the factory floor. Engineers migrating PIC16C7X designs to modern platforms can swap the OTP part for the flash-based PIC16F74A-I/PQ in the same 44-pin MQFP footprint when field updates become a requirement.
موصى به
Motor Drive and PWM Control
The PIC16C74AT-10/PQ is suitable for motor drive PWM control because its Capture/Compare/PWM (CCP) module generates the precise duty cycles needed for brushed DC, brushless DC, and stepper motor commutation. The 33 I/O pins handle direction logic, enable lines, Hall-sensor inputs, and current-sense feedback simultaneously. The 10MHz clock combined with the 8-bit PWM timer supports switching frequencies from a few hundred hertz up to roughly 40kHz, well within the range of small hobby and appliance-grade motor controllers. Brown-out Reset prevents erratic behavior during inductive load transients, while the Watchdog Timer recovers the firmware if a software lockup occurs in a noisy drive environment.
موصى به
Instrumentation and Data Acquisition Front-Ends
The PIC16C74AT-10/PQ is appropriate for instrumentation front-ends because its integrated 8-bit ADC and UART/USART peripherals allow direct connection to analog sensors and to host PCs or displays. With 33 I/O available, the MCU can scan multiple sensor channels, drive a character LCD, and stream digitized readings through the asynchronous serial port at standard baud rates up to 57.6k. The 192-byte RAM is sufficient for circular sample buffers in slow sampling applications such as temperature loggers and panel meters. The 4V to 6V Vcc range simplifies integration with legacy analog signal-conditioning stages built around +/-5V or single 5V rails.
موصى به
Automotive Body Electronics (Non-Safety)
The PIC16C74AT-10/PQ is well suited to non-safety automotive body electronics such as interior lighting controllers, seat-position memory, mirror adjusters, and accessory multiplex modules. The automotive-grade temperature variant (-40C to +125C) is the PIC16C74A-20I/L in the same MQFP family. The 33 I/O lines drive multiple relays and LEDs, while the integrated PWM module dims lamps without external driver circuitry. CAN or LIN transceivers must be added externally because the PIC16C74A family predates on-chip CAN peripherals; designers typically use the UART plus an external LIN transceiver for low-cost body networks.
موصى به
Legacy Consumer Embedded Products
The PIC16C74AT-10/PQ is widely deployed in legacy consumer products such as washing-machine controllers, microwave oven keypads, set-top box front panels, and early-generation remote controls. The 7KB OTP memory holds a fixed feature set that vendors do not intend to update after launch, and the 5V CMOS process minimizes BOM cost for high-volume SKUs. The MQFP-44 footprint remains mechanically compatible with the flash-based PIC16F74A, allowing service depots to keep spare parts available even after Microchip formally discontinues OTP production. For new consumer designs, the PIC16F74A-I/PQ offers the same peripheral map with field-reprogrammability.
موصى به
Educational and Hobby Electronics
The PIC16C74AT-10/PQ remains useful in educational and hobby contexts because of its clean PIC mid-range architecture, 35-instruction RISC set, and abundant reference material from Microchip application notes. Universities teaching embedded systems use it to demonstrate ADC sampling, UART communication, interrupt handling, and PWM generation on a real 5V CMOS platform. The MQFP-44 footprint, however, is harder to breadboard than DIP parts, so instructors often prefer the 40-pin PDIP PIC16C74A-10/P for classroom labs and switch to the MQFP variant only when surface-mount assembly is required.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ PIC16C74AT-10/PQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | PIC16C74A-10/PQ | PIC16C74A-20/PQ | PIC16C74A-20I/L | PIC16C74A-04/PQ | PIC16F74A-I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin MQFP (10x10) | 44-pin MQFP (10x10) - same | 44-pin MQFP (10x10) - same | 44-pin MQFP (10x10) - same | 44-pin MQFP (10x10) - same | 44-pin MQFP (10x10) - same |
| Maximum Clock Frequency | 10 MHz | 10 MHz | 20 MHz | 20 MHz | 4 MHz | 20 MHz |
| Program Memory Type | OTP (7KB / 4K x 14) | OTP (7KB) | OTP (7KB) | OTP (7KB) | OTP (7KB) | Flash (7KB) |
| Temperature Grade | Commercial | Commercial | Commercial | Industrial (-40C to +85C) | Commercial | Industrial (-40C to +85C) |
| Number of I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC | 8-bit integrated | 8-bit integrated | 8-bit integrated | 8-bit integrated | 8-bit integrated | 8-bit integrated |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
| Connectivity Peripherals | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART | I2C, SPI, UART/USART |
أبرز الفروقات
- Wide availability of same-package drop-in replacements within Microchip (مقابلPIC16C74A-10/PQ (same die, tray packaging))
- 20MHz upgrade path in identical footprint (مقابلPIC16C74A-20/PQ)
- Industrial temperature option for harsh environments (مقابلPIC16C74A-20I/L)
- Long-term availability via flash-based replacement (مقابلPIC16F74A-I/PQ)
ملاحظات التصميم
The PIC16C74AT-10/PQ operates from 4V to 6V (5V typical). Place a 100nF decoupling capacitor as close as possible to each Vdd pin (there are two on the MQFP-44 package) and add a bulk 10uF tantalum or aluminum cap on the main 5V rail. The Brown-out Detect/Reset and Power-On Reset blocks must see a clean rising Vcc edge during power-up, so avoid slow ramps under 10ms that could trip BOR repeatedly. For battery-backed designs, route the MCLR pin through a 10k pull-up to Vdd and a 100nF cap to ground to filter noise.
Route the 10MHz crystal or ceramic resonator traces (OSC1/OSC2) as short as possible and guard them with a ground pour to avoid injecting clock harmonics into the analog ADC inputs. Keep the ADC reference pin (RA3/VREF) away from switching PWM traces and place its local bypass capacitor within 5mm of the pin. For the MQFP-44 package, use a small ground plane under the die and stitch vias around the perimeter at 2mm pitch to reduce EMI from the parallel slave port transitions on PORTD.
OTP memory cannot be erased after programming, so always validate firmware on a flash-based PIC16F74A prototype before committing to OTP production parts. Programming voltage and timing for the PIC16C74AT-10/PQ follows Microchip programming spec 30402D; do not assume the timings from the F-series parts apply. Watch out for the configuration-word oscillator setting: a wrong HS/XT/LP choice on a high-speed crystal will prevent the part from starting. Finally, the 192-byte RAM is shared with the hardware register file, so leave at least 16 bytes headroom for stack growth to avoid mysterious resets.
معلومات الامتثال
Compliance flags are not specified in the verified distributor data. The part is OTP-based and predates widespread lead-free mandates; check the lot-specific documentation from the supplier before placing a lead-free order.
