PIC16C74B-04I/L - 8-bit OTP MCU, 7KB, 4MHz, 44-PLCC | Microchip
MPN: PIC16C74B-04I/L ✗ Cuối đờiPIC16C74B-04I/L Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces onto one silicon die. Within the broader taxonomy, the PIC16C74B belongs to the mid-range 8-bit MCU class (vs. baseline 12-bit core and enhanced 14-bit core), uses Harvard architecture with separate program/data buses, and executes one instruction per internal clock cycle (except program branches which are two cycles). The mid-range PIC family employs an advanced RISC instruction set with only 35 single-word instructions, enabling rapid code development and high code density. OTP (One-Time Programmable) memory is mask-ROM-like non-volatile storage that can be written once during production programming - distinct from flash which can be rewritten many times in-circuit.
Key features include 8 channels of 8-bit Analog-to-Digital conversion, two additional 8-bit timers (TMR0, TMR1, TMR2), two Capture/Compare/PWM modules, a synchronous serial port configurable as either 3-wire SPI or 2-wire I2C, and a USART with 9-bit address detection. The device operates from 2.5V to 5.5V across the industrial temperature range, includes an 8-level hardware stack, power-on reset, brown-out detect, watchdog timer with on-chip RC oscillator, and in-circuit serial programming capability.
The PIC16C74B uses Microchip's PIC16C mid-range core built on a fully-static CMOS process, with a 14-bit instruction word and 8-bit data path. The Harvard architecture allows simultaneous instruction fetch and data access, and the 200 ns instruction execution at 4 MHz provides deterministic interrupt response suitable for real-time control loops. The on-chip peripherals are mapped into the data memory space and accessed via banked registers, with the FSR/INDF indirect addressing mechanism for pointer-based data access.
Typical applications include industrial control panels, motor control subsystems, automotive body electronics (pre-CAN era), smart sensor interfaces, and embedded control modules requiring reliable OTP memory with deterministic interrupt latency. The 33 I/O pins and dual PWM channels make the device suitable for driving multiple actuators or LED arrays from a single chip.
When designing with this device, ensure the OTP programming step is integrated into the production flow because OTP memory cannot be field-upgraded. The PLCC package provides socket compatibility for legacy through-hole production lines but requires a footprint transition for new designs moving to surface-mount packages. The 4 MHz maximum clock is the limiting performance factor; designs requiring higher throughput should consider the PIC16C74B-10 or PIC16C74B-20 speed grades or the flash-based PIC18F family.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes - including pinout, package-svg, and FAQ not found on the manufacturer datasheet alone - to accelerate component selection for engineers maintaining legacy PIC16C designs.
Bộ thay thế dễ dàng lắp đặt cho PIC16C74B-04I/L — 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 PIC16C74B-04I/L (cùng hình factor và footprint) — khác nhau ở Package, Timers, Core Architecture, Operating Temperature, Serial Interfaces.
PIC16C74B-04/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74B-04E/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C73B-04I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74B-04/PQ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-10I/L
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16C74A-04I/L
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C74B-04I/L Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Instruction Set Size | 35 single-word instructions |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 bytes |
| Data EEPROM | Not present (OTP device) |
| Tần số xung maksimum | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Operating Voltage Range | 2.5 V to 5.5 V |
| Digital I/O Pins | 33 |
| Analog-to-Digital Converter | 8 channels, 8-bit resolution |
| Timers | 3 (TMR0, TMR1, TMR2) |
| Capture/Compare/PWM | 2 modules |
| Serial Interfaces | SPI / I2C (SSP) + USART |
| Hộp | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| Kiểu lắp đặt | Surface Mount (PLCC socket compatible) |
Cấu hình chân PIC16C74B-04I/L
| Chân 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Chân 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Chân 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Chân 4 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Chân 5 | RA3/AN3/VREF — Port A bit 3 / Analog input 3 / ADC reference |
| Chân 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Chân 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Chân 8 | RE0/RD/AN5 — Port E bit 0 / Parallel port read / Analog input 5 |
| Chân 9 | RE1/WR/AN6 — Port E bit 1 / Parallel port write / Analog input 6 |
| Chân 10 | RE2/CS/AN7 — Port E bit 2 / Parallel port chip select / Analog input 7 |
| Chân 11 | VDD — Positive supply voltage (+5V typical) |
| Chân 12 | VSS — Ground reference |
| Chân 13 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Chân 14 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Chân 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator / clock |
| Chân 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator / CCP2 |
| Chân 17 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Chân 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 19 | RD0/PSP0 — Port D bit 0 / Parallel slave port bit 0 |
| Chân 20 | RD1/PSP1 — Port D bit 1 / Parallel slave port bit 1 |
| Chân 21 | RD2/PSP2 — Port D bit 2 / Parallel slave port bit 2 |
| Chân 22 | RD3/PSP3 — Port D bit 3 / Parallel slave port bit 3 |
| Chân 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 25 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Chân 26 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Chân 27 | RD4/PSP4 — Port D bit 4 / Parallel slave port bit 4 |
| Chân 28 | RD5/PSP5 — Port D bit 5 / Parallel slave port bit 5 |
| Chân 29 | RD6/PSP6 — Port D bit 6 / Parallel slave port bit 6 |
| Chân 30 | RD7/PSP7 — Port D bit 7 / Parallel slave port bit 7 |
| Chân 31 | VSS — Ground reference |
| Chân 32 | VDD — Positive supply voltage (+5V typical) |
| Chân 33 | RB0/INT — Port B bit 0 / External interrupt |
| Chân 34 | RB1 — Port B bit 1 |
| Chân 35 | RB2 — Port B bit 2 |
| Chân 36 | RB3/PGM — Port B bit 3 / Low-voltage programming |
| Chân 37 | RB4 — Port B bit 4 |
| Chân 38 | RB5 — Port B bit 5 |
| Chân 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| Chân 40 | RB7/PGD — Port B bit 7 / ICSP data |
| Chân 41 | VSS — Ground reference |
| Chân 42 | VDD — Positive supply voltage (+5V typical) |
| Chân 43 | NC — Not connected (PLCC pin reserved) |
| Chân 44 | NC — Not connected (PLCC pin reserved) |
Ứng dụng tiêu biểu
PIC16C74B-04I/L phù hợp cho 6 Áp dụngs: Industrial Control Panels, Motor Control Subsystems, Smart Sensor Interfaces, Embedded Automotive Body Electronics, HVAC Climate Control Modules, LED Display Controllers.
Industrial Control Panels
The PIC16C74B-04I/L fits industrial control panel designs because its 33 digital I/O pins can directly drive 7-segment displays, keypads, relay coils, and status LEDs without external logic. Its 8-channel 8-bit ADC reads potentiometers, voltage dividers, and analog sensor outputs from the panel's front-end circuitry, while the 2.5V-5.5V supply tolerates typical 5V industrial backplanes. The -40C to +85C industrial temperature range keeps the controller reliable inside unheated enclosures on factory floors, and the 200 ns deterministic interrupt response ensures consistent keypad-debounce and relay-debounce timing. The USART drives Modbus RTU over RS-485 through an external transceiver, and the on-chip SPI/I2C peripherals connect to EEPROM calibration storage and digital potentiometers for field-trimmable setpoints.
Được đề xuất
Motor Control Subsystems
The PIC16C74B-04I/L suits low-cost motor control designs where the 2 CCP/PWM modules generate complementary drive waveforms for small DC or stepper motors below 1A continuous current. The 8-channel ADC samples shunt current, back-EMF, and potentiometer position feedback in real time at up to approximately 20 kS/s aggregate throughput. The -40C to +85C rating tolerates the thermal environment inside motor housings, and the 33 I/O pins drive direction logic, enable lines, and fault inputs without external glue logic. The USART reports telemetry to a host controller for predictive maintenance, while the on-chip watchdog timer with dedicated oscillator catches firmware lockups caused by EMI from the motor's commutator.
Được đề xuất
Smart Sensor Interfaces
The PIC16C74B-04I/L is well-suited for smart sensor interface modules that aggregate multiple analog and digital sensors into a single fieldbus node. The 8-channel 8-bit ADC reads thermocouples, RTDs, strain gauges, and 4-20 mA loops with on-chip multiplexing; the SPI peripheral connects to digital temperature sensors or accelerometers; and the I2C bus interfaces to EEPROM calibration memory and LCD character displays. The 192-byte RAM buffers sensor data between conversion cycles, and the USART provides RS-232 or RS-485 output for industrial networks. The industrial temperature range of -40C to +85C allows deployment in outdoor and unheated cabinets common to SCADA and process-control installations.
Được đề xuất
Embedded Automotive Body Electronics
The PIC16C74B-04I/L fits pre-CAN-era automotive body modules controlling lighting, mirrors, seat positioning, and HVAC blend doors. Its 33 I/O pins drive lamp relays, stepper motor windings, and dashboard indicators directly; the ADC reads position sensors and ambient light sensors; and the PWM modules dim interior lighting or drive small BLDC fans. The -40C to +85C industrial temperature range meets cabin-electronics requirements but is not qualified for under-hood engine control. Note that AEC-Q100 automotive qualification is NOT available for the PIC16C74B family; automotive designs after 2020 should use AEC-Q100-qualified PIC16F or dsPIC33 parts. The OTP memory is suitable for high-volume automotive production where firmware is locked at factory programming.
Được đề xuất
HVAC Climate Control Modules
The PIC16C74B-04I/L integrates HVAC climate control logic by reading multiple thermistor inputs through its 8-channel ADC, driving triac gate pulses through the 2 CCP/PWM modules for heater/coolant valve modulation, and displaying setpoint temperatures via the SPI peripheral to a character LCD. The 192-byte RAM maintains hysteresis and PID state across cycles without external memory. The 33 I/O pins support multiple button inputs, fan-speed relays, and mode-select LEDs; the USART reports diagnostics to a central controller. The industrial -40C to +85C rating tolerates plenum-mounted enclosures near heating ducts. For new HVAC designs, evaluate the PIC18F4620 flash-based successor for field firmware updates via in-circuit serial programming.
Được đề xuất
LED Display Controllers
The PIC16C74B-04I/L drives multi-segment LED matrix displays where the 33 I/O pins provide direct row/column multiplexing without external shift-register chains. The 2 CCP/PWM modules generate multiplex timing or analog dimming signals, and the on-chip 8-channel ADC reads ambient light sensors for automatic brightness adjustment. The USART receives display data and commands from a host processor at 115.2 kbps or higher. The OTP memory locks the multiplexing algorithm at production, eliminating field-tampering risk in digital-signage applications. The 200 ns instruction cycle ensures refresh rates above 100 Hz for flicker-free operation, even when managing 8x8 or larger LED matrices. Industrial temperature rating supports outdoor kiosk installations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16C74B-04I/L — 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 | PIC16C74B-04/L | PIC16C73B-04I/L | PIC16C74A-10I/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (J-Lead) | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 10 MHz (+150%) |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP | 4 KB OTP (-43%) | 7 KB OTP |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Digital I/O Pins | 33 | 33 | 22 (28-pin feature set on 44-PLCC) | 33 |
| ADC Channels | 8 x 8-bit | 8 x 8-bit | 5 x 8-bit (-38%) | 8 x 8-bit |
| CCP/PWM Modules | 2 | 2 | 2 | 2 |
| Operating Temperature | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Lifecycle Status | NRND | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- Industrial temperature grade OTP microcontroller (vsPIC16C74B-04/L)
- Largest memory in PIC16C74B family (vsPIC16C73B-04I/L)
- Mid-range core with full peripheral set (vsPIC16C74A-10I/L)
Ghi chú thiết kế
Decouple the PIC16C74B-04I/L with a 100 nF ceramic capacitor placed within 5 mm of each VDD/VSS pin combination (pins 11/12, 31/41, 32/42 on the 44-PLCC). The PIC16C74B datasheet recommends an additional 10 uF bulk capacitor near the VDD pin cluster. Brown-out detect should be enabled in the configuration word for reliable reset behavior during supply droops below 4.0V; without BOD, voltage drops can cause corrupted program execution in OTP memory reads.
Place the 4 MHz crystal or ceramic resonator within 10 mm of OSC1 (pin 13) and OSC2 (pin 14) to minimize parasitic capacitance. Add a ground guard ring around the oscillator traces and route them over a continuous ground plane to reduce EMI pickup. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for proper in-circuit serial programming (ICSP) operation.
OTP memory is one-time programmable - any firmware bug shipped to production becomes permanent and cannot be patched without a full chip replacement. Always verify firmware on a flash-based development part (PIC16F877A-I/L or PIC16F877) before committing to PIC16C74B production programming. Configuration bits must be set correctly during programming or the device will not execute; most common failures are wrong oscillator mode (RC vs XT vs HS) and disabled watchdog or brown-out reset.
Route the ICSP clock (PGC, pin 39) and ICSP data (PGD, pin 40) signals away from high-current switching nodes such as PWM outputs and relay drive traces. Keep serial-port traces (RC6/RC7 for USART, RC3-RC5 for SPI/I2C) matched in length and routed over a continuous ground plane for signal integrity. The PLCC-44 socket allows field replacement but introduces parasitic inductance - for production PCBs consider surface-mount PQFP variants to reduce EMI.
Thông tin tuân thủ
AEC-Q100 automotive qualification is NOT available for PIC16C74B family - use AEC-Q100-qualified PIC16F or dsPIC33A parts for automotive designs. RoHS/REACH/lead-free status not specified in provided data - [DATA_NEEDED].
