PIC16C74AT-20I/L - 8-bit 20MHz PIC MCU, 7KB OTP, 44-PLCC | Microchip
부품 번호: PIC16C74AT-20I/L ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $13.5 | $13.50 |
| 10 | $12.15 | $121.50 |
| 100 | $10.8 | $1,080.00 |
| 500 | $9.45 | $4,725.00 |
| 1,000 | $8.1 | $8,100.00 |
PIC16C74AT-20I/L 개요
What is a PIC 16C microcontroller? PIC 16C devices are members of Microchip's classic mid-range 8-bit microcontroller family, fully static CMOS designs that integrate a RISC CPU core, program memory, data RAM, and a rich set of on-chip peripherals around a unified instruction set. They sit in the broader hierarchy of PIC microcontrollers -> 8-bit microcontrollers -> microcontrollers (MCU) -> microcontrollers and processors -> semiconductors. The "16C" prefix denotes EPROM-based (erasable windowed) program memory, while PIC16F variants use flash; PIC16C parts are typically used where traceability, in-circuit reprogrammability in a windowed package, or long-term reliability validation of the OTP silicon is required.
Key features of the PIC16C74AT-20I/L include 33 general-purpose digital I/O pins, an 8-channel 8-bit Analog-to-Digital Converter (ADC), two Capture/Compare/PWM (CCP) modules, an asynchronous/synchronous USART with address masking, a Master Synchronous Serial Port (MSSP) supporting both I2C (Master/Slave) and SPI modes, and a Parallel Slave Port. System integrity features include a Brown-Out Reset (BOR), Power-On Reset (POR), a Watchdog Timer (WDT) with its own on-chip RC oscillator, and dual oscillator options (XT/HS/RC/LP). The "-20I" suffix indicates a 20 MHz speed grade and an industrial temperature range of -40C to +85C.
The PIC16C74AT-20I/L uses a Harvard architecture with a separate 14-bit instruction word and 8-bit data path, executing most instructions in a single 200 ns cycle (at 20 MHz). The wide operating voltage range of 4.0 V to 6.0 V supports both 5 V regulated rails and battery-backed systems, while the high sink/source current of 25 mA per I/O pin enables direct LED or relay drive without external buffers.
Typical applications include industrial process control, motor control front-ends, instrumentation, automotive body electronics (non-safety), and embedded control in white goods and HVAC subsystems. The on-chip ADC, CCP/PWM and MSSP peripherals make it well suited to closed-loop control systems where deterministic instruction timing and integrated analog simplify the BOM.
When designing with this part, confirm that OTP program memory matches the production flow - OTP can be programmed only once and is unsuitable for designs that require firmware updates. Designers targeting long life-cycles should evaluate the flash-based PIC16F74A family or the migration path documented in Microchip device migration guides.
This page synthesizes distributor pricing, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: PIC16C74AT-20I/L — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: PIC16C74AT-20I/L (동일 폼 팩터 및 풋프린트) — 차이점: Mounting Type, Package, Core Architecture, I/O Sink/Source Current, Maximum Clock Frequency.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
PIC16C74A-20I/L
✅ 드롭인✓ 재고 있음
$8.75 / 개
데이터시트 보기 →PIC16C74A-10/L
✅ 드롭인✓ 재고 있음
$8.4 / 개
데이터시트 보기 →PIC16C74A-04I/P
✅ 드롭인✓ 재고 있음
$7.5 / 개
데이터시트 보기 →PIC16F74A-I/L
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
PIC16C74AT-20I/L 최대 정격 & 전기적 특성
| Core Architecture | PIC 16C, 8-bit RISC, Harvard |
| Maximum CPU Frequency | 20 MHz |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Program Memory Type | OTP (One-Time-Programmable) EPROM |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 bytes |
| General-Purpose I/O Pins | 33 |
| ADC | 8 channels, 8-bit |
| CCP/PWM Modules | 2 |
| Communication Interfaces | I2C (MSSP), SPI (MSSP), USART (SCI) |
| Operating Voltage Range | 4.0 V to 6.0 V |
| 동작 온도 범위 | -40 C to +85 C (Industrial, "I" grade) |
| I/O Sink/Source Current | 25 mA per pin |
| 패키지 | 44-PLCC (16.59 x 16.59 mm) |
| 실장 유형 | Surface Mount (PLCC socket or direct) |
| Watchdog Timer | Yes, dedicated on-chip RC oscillator |
| Brown-Out Reset / Power-On Reset | Yes (BOR and POR) |
PIC16C74AT-20I/L 핀 구성
| 핀 1 | MCLR — Master Clear (Reset) input, active low |
| 핀 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| 핀 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| 핀 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| 핀 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / ADC VREF+ |
| 핀 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| 핀 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI Slave Select |
| 핀 8 | OSC1/CLKIN — Oscillator input / external clock |
| 핀 9 | OSC2/CLKOUT — Oscillator output / clock out |
| 핀 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| 핀 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| 핀 12 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| 핀 13 | RC3/SCK/SCL — PORTC bit 3 / MSSP SPI clock / I2C clock |
| 핀 14 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| 핀 15 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| 핀 16 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| 핀 17 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| 핀 18 | RC4/SDI/SDA — PORTC bit 4 / MSSP SPI data in / I2C data |
| 핀 19 | RC5/SDO — PORTC bit 5 / MSSP SPI data out |
| 핀 20 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| 핀 21 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| 핀 22 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| 핀 23 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| 핀 24 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| 핀 25 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| 핀 26 | VSS — Ground reference |
| 핀 27 | VDD — Positive supply voltage |
| 핀 28 | RB0/INT — PORTB bit 0 / External interrupt |
| 핀 29 | RB1 — PORTB bit 1 |
| 핀 30 | RB2 — PORTB bit 2 |
| 핀 31 | RB3 — PORTB bit 3 |
| 핀 32 | RB4 — PORTB bit 4 |
| 핀 33 | RB5 — PORTB bit 5 |
| 핀 34 | RB6/PGC — PORTB bit 6 / ICSP clock |
| 핀 35 | RB7/PGD — PORTB bit 7 / ICSP data |
| 핀 36 | RE0/RD — PORTE bit 0 / Parallel Slave Port read control |
| 핀 37 | RE1/WR — PORTE bit 1 / Parallel Slave Port write control |
| 핀 38 | RE2/CS — PORTE bit 2 / Parallel Slave Port chip select |
| 핀 39 | VDD — Positive supply voltage |
| 핀 40 | VSS — Ground reference |
| 핀 41 | RA6/OSC2 — PORTA bit 6 / alternate oscillator output |
| 핀 42 | RA7/OSC1 — PORTA bit 7 / alternate oscillator input |
| 핀 43 | RC0 — PORTC bit 0 (alt) |
| 핀 44 | NC — Not connected (per datasheet PLCC pin map) |
일반적인 애플리케이션
PIC16C74AT-20I/L 적합 용도: 6 애플리케이션s: Industrial Process Control, Motor Control Front-End, HVAC Subsystem Controller, Instrumentation and Data Acquisition, Automotive Body Electronics (Non-Safety), White Goods and Appliance Control.
Industrial Process Control
The PIC16C74AT-20I/L fits industrial process control loops because its 20 MHz RISC core, 8-channel 8-bit ADC and two CCP/PWM modules implement PID control of valves, heaters and motor drives within a single chip. Its 4.0 V to 6.0 V supply tolerates 5 V industrial backplanes and 24 V-derived rails after regulation, while -40 C to +85 C operation survives factory-floor temperatures. The integrated I2C/SPI MSSP and USART simplify the connection to sensor front-ends, HMI displays and supervisory PLCs over RS-485 or I2C. Compared with discrete analog loops, the PIC16C74A reduces BOM, PCB area and mean time to repair in long-life machinery.
추천
Motor Control Front-End
The PIC16C74AT-20I/L's two CCP/PWM modules and 33 GPIO pins (25 mA sink/source) make it a compact motor control front-end for brushed DC, unipolar stepper and small BLDC drive stages. The 200 ns instruction cycle at 20 MHz provides the deterministic loop time needed for sinusoidal commutation at moderate RPM, while the 8-bit ADC samples back-EMF or current shunt signals. Brown-Out Reset and Watchdog Timer preserve safe state on brown-outs in noisy motor environments, and the USART feeds debug telemetry or accepts trajectory commands from a higher-level controller. Use this PIC16C7X part when design traceability and OTP locking outweigh flash reprogrammability.
추천
HVAC Subsystem Controller
The PIC16C74AT-20I/L is well suited to HVAC subsystem controllers for fan speed, damper and thermostat loops thanks to its 7 KB OTP program memory, which comfortably fits typical HVAC state machines with sensor linearization tables. The 8-channel ADC reads thermistor, humidity and pressure transducers, while the CCP/PWM outputs drive TRIAC phase-angle control of AC loads or PWM to brushless fan drivers. I2C/SPI links to an external display or keypad controller, and the USART exposes a maintenance/diagnostic port. The 44-PLCC package is socket-friendly for serviceability in field-replaceable control boards, an asset for white-goods and HVAC integrators managing long service windows.
추천
Instrumentation and Data Acquisition
For instrumentation and slow-channel data acquisition, the PIC16C74AT-20I/L integrates an 8-bit ADC, USART and I2C/SPI in a single chip, enabling compact 8-channel voltmeters, panel meters and laboratory instruments. The Harvard architecture and 14-bit instruction word produce predictable loop timing critical for accurate ADC sampling windows, while 192 bytes of RAM buffer small acquisition bursts before USART upload to a host. OTP memory locks calibration coefficients and firmware for regulatory traceability in medical or test equipment. When paired with an external 12-/16-bit ADC via SPI, the PIC16C74A can act as a deterministic acquisition and display controller.
추천
Automotive Body Electronics (Non-Safety)
Although not AEC-Q100 qualified, the PIC16C74AT-20I/L appears in legacy automotive body-electronics designs (interior lighting, seat controllers, accessory multiplexers) where the -40 C to +85 C industrial temperature range covers cabin conditions. The 33 GPIO pins drive relays, LEDs and small solenoids directly at 25 mA per pin, while the MSSP implements LIN-style or I2C body networks. For safety-critical ADAS or powertrain, Microchip directs designers to dsPIC33 and PIC18 AEC-Q100 parts. The 44-PLCC socketed package supports service-friendly module replacement across long vehicle service windows.
추천
White Goods and Appliance Control
The PIC16C74AT-20I/L's combination of OTP memory (locked firmware for safety), 8-bit ADC, PWM outputs and USART supports appliance control boards such as washing machines, dishwashers and small kitchen appliances. The 200 ns instruction cycle drives timer-driven wash cycles, while the ADC reads water level, temperature and turbidity sensors. Brown-Out Reset and Watchdog Timer prevent unsafe states on line-voltage brown-outs. Designers who need last-minute firmware changes during certification should evaluate the flash-based PIC16F74A family; otherwise the PIC16C74A's OTP locking enforces final production firmware, a benefit in regulated appliances.
추천
추천 제품 요약
엔지니어링 참조 데이터: PIC16C74AT-20I/L — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | PIC16C74A-20I/L | PIC16C74A-10/L | PIC16C74A-04I/P | PIC16F74A-I/L |
|---|---|---|---|---|---|
| Package | 44-PLCC (L), 16.59 x 16.59 mm | 44-PLCC (L) - same | 44-PLCC (L) - same | PDIP-40 (P) - different | 44-PLCC (L) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB (4K x 14) OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash (in-field reprogrammable) |
| Max CPU Frequency | 20 MHz | 20 MHz | 10 MHz | 4 MHz | 20 MHz |
| Operating Voltage | 4.0 V to 6.0 V | 4.0 V to 6.0 V | 4.0 V to 6.0 V | 4.0 V to 6.0 V | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C | -40 C to +85 C |
| GPIO Pins | 33 | 33 | 33 | 33 | 33 |
| ADC | 8 channels, 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active |
주요 차별점
- 44-PLCC package option with industrial temperature range (vs PIC16C74AT-20I/PT (TQFP-44))
- OTP EPROM program memory for firmware locking (vs PIC16F74A-I/L (Flash))
- 20 MHz instruction rate with deterministic 200 ns cycle (vs PIC16C74A-10/L (10 MHz))
설계 노트
The PIC16C74AT-20I/L uses One-Time-Programmable EPROM that can be written only once - there is no in-field firmware update path. Confirm early in the design cycle that OTP locking is acceptable, otherwise migrate to the flash-based PIC16F74A-I/L which is pin-compatible in the 44-PLCC package. Estimated: a single production firmware change on OTP requires a new silicon lot, so design firmware freeze and qualification steps as a hard gate.
VDD must be decoupled with a 100 nF ceramic capacitor placed within 5 mm of the VDD pins (PLCC pins 27 and 39) and a bulk 10 uF tantalum or aluminum polymer capacitor. Brown-Out Reset thresholds are configured in the configuration word; setting BOREN with the appropriate BOR voltage (BORV1:BORV0) protects the MCU on 5 V industrial rails subject to dropout. Estimated: a poorly decoupled VDD will trigger spurious BOR events on motor-control PCBs.
Route the analog AVss/AVdd pair (where present in the chosen configuration) away from the switching traces of CCP/PWM outputs and the Parallel Slave Port bus. Place the 8-channel ADC reference bypass capacitor adjacent to the RA3/VREF+ pin. Estimated: a 10 mm separation between analog traces and PWM edges typically keeps coupled noise below the 1 LSB of the 8-bit ADC at full-scale.
The MSSP pins SCK/SCL (RC3) and SDI/SDA (RC4) carry the I2C/SPI bus; add 4.7 kohm pull-ups on SCL/SDA when used in I2C mode and series 22-100 ohm resistors near the MCU pin when the bus runs longer than 50 mm. The USART pins RC6/TX and RC7/RX are 5 V TTL-level; connect through a level translator (e.g. MAX3232) for RS-232. Estimated: long unbussed MSSP traces on a 4-layer PCB may exceed I2C spec rise time above 100 kHz.
The PIC16C74AT-20I/L industrial-grade part is rated -40 C to +85 C junction, and the 44-PLCC package dissipates well under 1 W in typical 20 MHz applications. Inducted environments (relay drivers, motor control) should still keep the junction below 100 C; use the PLCC socket thermal pad with copper pour if fitted, and derate ambient above 60 C. Estimated: at ICC = 20 mA and VDD = 5 V, package self-heating is well under 5 C above ambient in still air.
규정 준수 정보
RoHS / lead-free status for the obsolete PIC16C74AT-20I/L was not present in the Verified Web Data. The PIC16C7X family is not AEC-Q100 qualified and is not recommended for safety-critical automotive applications. Confirm compliance directly with Microchip documentation for current orders.
