PIC16C74A-20E/PQ - 8-Bit CMOS MCU, 7KB OTP, 33 I/O | Microchip
MPN: PIC16C74A-20E/PQ ⚠ Lần mua cuốiPIC16C74A-20E/PQ Tóm tắt
An 8-bit microcontroller is a single-chip computer built around an 8-bit data path, integrating CPU, program memory, RAM, and peripherals into one IC. It belongs to the broader hierarchy of microcontrollers -> microcontrollers (MCU) -> embedded computing -> semiconductors. The PIC16C7X family specifically targets cost-sensitive embedded control designs requiring on-chip A/D conversion, timers, synchronous/asynchronous serial ports, and parallel I/O in a single device.
Key features include 33 digital I/O pins across five ports, 25/25 mA high sink/source current capability per pin, an instruction set of only 35 single-word instructions with all single-cycle except program branches (two cycles), and three timer/counter modules. Brown-out reset and a watchdog timer enhance field reliability. The 'E' suffix indicates the extended industrial temperature range of -40 °C to +125 °C.
Architecture-wise, the PIC16C74A-20E/PQ uses a Harvard RISC core with a 14-bit instruction word and separate program and data buses, allowing instruction fetch and operand access in one cycle. The integrated successive-approximation A/D converter supports 8 channels with 8-bit resolution, and dual analog comparators plus a Capture/Compare/PWM module make it suitable for closed-loop control.
Typical applications include industrial process control nodes, automotive body controllers (extended temp), appliance motor control, smart sensor signal conditioning, and embedded data acquisition systems. The high-current I/O allows direct LED and relay drive without buffers.
When designing with this part, ensure Vdd decoupling with a 100 nF ceramic close to the pins and respect the maximum clock frequency (20 MHz at 4.0–6.0 V). OTP memory cannot be re-programmed in-circuit, so production programming via ICSP is required.
This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C7X family, and practical design notes not found in the original Microchip datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16C74A-20E/PQ — 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 PIC16C74A-20E/PQ (cùng hình factor và footprint) — khác nhau ở Package, Core Architecture, Serial Interfaces, Program Memory Size, Timers.
PIC16C74A-20/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-20I/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-10/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74AT-20E/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C67-20E/PQ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74A-20E/PQ Tỷ lệ tối đa & tính chất điện
| Architecture | 8-bit PIC16C mid-range RISC |
| Program Memory (ROM) | 7 KB OTP EPROM |
| Data Memory (RAM) | 192 bytes |
| Tần số xung maksimum | 20 MHz |
| Supply Voltage (Vdd) | 4.0 V to 6.0 V |
| Khoảng nhiệt độ hoạt động | -40 C to +125 C (extended 'E') |
| I/O Pins | 33 |
| A/D Converter | 8-channel, 8-bit |
| Instruction Set Size | 35 single-word instructions |
| Timers | 3 (Timer0, Timer1, Timer2) |
| I/O Sink/Source Current | 25 mA / 25 mA per pin |
| Standby Current (typ) | 15 µA at 5 V, 4 MHz; 1 µA at 3 V, 32 kHz |
| Hộp | 44-pin MQFP (Metric Quad Flat Pack) |
| Kiểu lắp đặt | Surface Mount |
| Lead-Free / RoHS | Extended-temp; check lot for lead-free status |
Cấu hình chân PIC16C74A-20E/PQ
| Chân 1 | MCLR/Vpp — Master Clear (reset, active low) / programming voltage |
| Chân 2 | RA0/AN0 — Port A bit 0 / analog channel 0 |
| Chân 3 | RA1/AN1 — Port A bit 1 / analog channel 1 |
| Chân 4 | RA2/AN2 — Port A bit 2 / analog channel 2 |
| Chân 5 | RA3/AN3/Vref — Port A bit 3 / analog channel 3 / A/D Vref+ |
| Chân 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Chân 7 | RA5/AN4/SS — Port A bit 5 / analog channel 4 / SPI slave select |
| Chân 8 | Vss — Ground |
| Chân 9 | OSC1/CLKI — Oscillator crystal input / external clock in |
| Chân 10 | OSC2/CLKO — Oscillator crystal output / clock out |
| Chân 11 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock in |
| Chân 12 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator in / CCP2 |
| Chân 13 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM1 |
| Chân 14 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 15 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 16 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 17 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Chân 18 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Chân 19 | Vss — Ground |
| Chân 20 | Vdd — Positive supply |
| Chân 21 | RB0/INT — Port B bit 0 / external interrupt |
| Chân 22 | RB1 — Port B bit 1 |
| Chân 23 | RB2 — Port B bit 2 |
| Chân 24 | RB3 — Port B bit 3 |
| Chân 25 | RB4 — Port B bit 4 |
| Chân 26 | RB5 — Port B bit 5 |
| Chân 27 | RB6/PGC — Port B bit 6 / ICSP clock |
| Chân 28 | RB7/PGD — Port B bit 7 / ICSP data |
| Chân 29 | Vss — Ground |
| Chân 30 | Vdd — Positive supply |
| Chân 31 | NC — Not connected (per datasheet) |
| Chân 32 | NC — Not connected (per datasheet) |
| Chân 33 | RD0/PSP0 — Port D bit 0 / parallel slave port bit 0 |
| Chân 34 | RD1/PSP1 — Port D bit 1 / parallel slave port bit 1 |
| Chân 35 | RD2/PSP2 — Port D bit 2 / parallel slave port bit 2 |
| Chân 36 | RD3/PSP3 — Port D bit 3 / parallel slave port bit 3 |
| Chân 37 | RD4/PSP4 — Port D bit 4 / parallel slave port bit 4 |
| Chân 38 | RD5/PSP5 — Port D bit 5 / parallel slave port bit 5 |
| Chân 39 | RD6/PSP6 — Port D bit 6 / parallel slave port bit 6 |
| Chân 40 | RD7/PSP7 — Port D bit 7 / parallel slave port bit 7 |
| Chân 41 | RE0/RD/AN5 — Port E bit 0 / read control / analog channel 5 |
| Chân 42 | RE1/WR/AN6 — Port E bit 1 / write control / analog channel 6 |
| Chân 43 | RE2/CS/AN7 — Port E bit 2 / chip select / analog channel 7 |
| Chân 44 | AVss — Analog ground |
Ứng dụng tiêu biểu
PIC16C74A-20E/PQ phù hợp cho 7 Áp dụngs: Industrial Process Control Nodes, Automotive Body Controllers, Smart Sensor Signal Conditioning, Appliance Motor and PWM Control, Embedded Data Acquisition Systems, Educational and Hobbyist Robotics, Point-of-Sale Terminal Peripherals.
Industrial Process Control Nodes
The PIC16C74A-20E/PQ's 8-bit A/D converter, 33 I/O lines, and 25 mA sink/source capability suit it for distributed industrial sensor nodes measuring temperature, pressure, and flow in factory automation. The extended -40 °C to +125 °C temperature grade allows deployment inside unheated enclosures or near motor-drive heat sources. The 20 MHz clock and 35-instruction RISC core deliver 5 MIPS, enabling PID loops and Modbus-style polling without external logic. A 100 nF ceramic Vdd decoupling capacitor close to pins and a 10 µF bulk cap on the analog supply are recommended for A/D accuracy.
Được đề xuất
Automotive Body Controllers
Body and chassis controllers such as lighting modules, seat controllers, and HVAC actuators benefit from the PIC16C74A-20E/PQ's extended temperature range and high-current 25 mA per-pin drive, which can sink relays and LEDs directly. The Capture/Compare/PWM module generates the control signals for DC motor speed, and the integrated timers support multiplexed switch-scanning routines. Although this part is OTP and pre-AEC-Q100, the extended temperature grade keeps it in service for underhood and underbody retrofit applications where cost dominates the BOM.
Được đề xuất
Smart Sensor Signal Conditioning
The PIC16C74A-20E/PQ's 8-channel 8-bit A/D combined with two analog comparators allows direct interfacing to thermocouples, RTDs, and bridge-style pressure sensors with on-chip excitation. The 192-byte RAM is sufficient for sensor linearization tables and the 7 KB OTP holds calibration coefficients. The 20 MHz CPU executes sample-and-average filters and serial-protocol output to a host PLC or HMI. A separate AVdd pin pair with its own LC filter is recommended to keep switching noise out of the A/D conversion.
Được đề xuất
Appliance Motor and PWM Control
Brush-DC and small universal-motor controllers in washers, dryers, and kitchen appliances use the PIC16C74A-20E/PQ's Capture/Compare/PWM module for closed-loop speed control. The 25 mA sink/source I/O directly drives optocouplers and low-side FETs without external buffers, reducing the BOM. Five I/O ports give plenty of keypad, LED, and tachometer inputs. A typical 50 Hz or 60 Hz mains-isolated design runs the part at 4 MHz to minimize EMI, leaving 16 MHz headroom.
Được đề xuất
Embedded Data Acquisition Systems
Standalone data loggers for environmental monitoring, energy metering, and remote telemetry leverage the PIC16C74A-20E/PQ's 8-bit A/D, three timers, and asynchronous serial port. The 7 KB OTP holds sampling schedules and Modbus-RTU framing, while the 192-byte RAM buffers samples between transmissions. Sleep current under 1 µA at 3 V (with WDT) allows battery-powered deployments lasting years. Brown-out reset prevents corrupted logs during power dips.
Được đề xuất
Educational and Hobbyist Robotics
The PIC16C74A-20E/PQ is popular in hobbyist robotics and university embedded courses because its 35-instruction RISC set is straightforward to teach and its 33 I/O pins can drive small DC servos, H-bridges, and IR sensors. The 20 MHz clock provides ample throughput for line-following and PID motor loops. The 44-MQFP package suits surface-mount breakout boards, and the ICSP programming header makes classroom flashing straightforward with PICkit tools.
Được đề xuất
Point-of-Sale Terminal Peripherals
Bar-code scanners, receipt printers, and PIN-pad peripherals historically used the PIC16C74A-20E/PQ for keyboard scanning, LCD driving, and serial-port uplink. Its 25 mA per-pin capability directly drives LCD backlight transistors, while the 8-bit A/D reads battery voltage and temperature-compensation sensors. Although new POS designs use flash parts, this OTP variant remains in service in legacy retail terminals, with last-time-buy inventory available from authorized brokers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C74A-20E/PQ — 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 | PIC16C74A-20/PQ | PIC16C74A-20I/PQ | PIC16C74A-04/PQ | PIC16C74A-10/PQ | PIC16C74AT-20E/PQ | PIC16C67-20E/PQ |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP | 44-MQFP - same | 44-MQFP - same | 44-MQFP - same | 44-MQFP - same | 44-MQFP - same | 44-MQFP - same |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 4 MHz | 10 MHz | 20 MHz | 20 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 8 KB OTP (no A/D) |
| A/D Converter | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | 8-ch, 8-bit | None |
| Temperature Range | -40 C to +125 C (E) | 0 to +70 C | -40 to +85 C (I) | 0 to +70 C | 0 to +70 C | -40 to +125 C (E) | -40 to +125 C (E) |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage | 4.0-6.0 V | 4.0-6.0 V | 4.0-6.0 V | 4.0-6.0 V | 4.0-6.0 V | 4.0-6.0 V | 4.0-6.0 V |
Bảo phân biệt quan trọng
- Extended -40 to +125 C temperature grade (vsPIC16C74A-20/PQ)
- Highest 20 MHz clock in the PIC16C74A family (vsPIC16C74A-04/PQ)
- Integrated 8-channel 8-bit A/D converter (vsPIC16C67-20E/PQ)
Ghi chú thiết kế
Estimated: at 20 MHz and 5 V the PIC16C74A-20E/PQ draws about 15-25 mA. Place a 100 nF ceramic decoupling capacitor within 5 mm of each Vdd pin (44-MQFP has multiple Vdd pins at 20 and 30), plus a 10 µF bulk tantalum or ceramic on the main supply. Use a ferrite bead or LC filter between digital Vdd and analog AVdd to keep digital switching noise out of the A/D converter.
The 44-MQFP land pattern requires careful thermal relief on the pads to ease hand-rework and inspection. Keep analog traces (RA0-RA5, RE0-RE2) short and routed away from digital Port D traces and the parallel-slave-port bus. The MCLR/Vpp pin must have a 10 kohm pull-up to Vdd; the ICSP clock and data lines (RB6/RB7) should each have a series resistor of about 4.7 kohm for in-circuit programming isolation.
Do not exceed 4.0 V minimum Vdd; operation below this trips brown-out reset. The 'E' suffix parts operate to +125 °C but with derated clock speed. Watchdog timer must be cleared in firmware or it will reset the MCU every ~18 ms nominal. Remember that OTP memory cannot be erased - use PIC16F74 for development and only migrate to PIC16C74A-20E/PQ for production.
For long-trace oscillator operation, place the crystal and its load capacitors (typically 15-33 pF) within 5 mm of OSC1 and OSC2. Avoid routing the parallel slave port (RD0-RD7, RE0-RE2) near the oscillator to prevent capacitive crosstalk. If using the analog comparators, separate their inputs from digital switching signals by a guard trace tied to AVss.
Thông tin tuân thủ
OTP EPROM PIC16C7X family predates AEC-Q100 qualification; not AEC-Q100 qualified. RoHS/lead-free status varies by lot - check manufacturer certificate for specific date code. Microchip product page recommends migration to PIC16F74 for new designs.
