PIC16LC74BT-04/L
PIC16LC74BT-04/L - 8-Bit 4MHz MCU, 7KB OTP, 44-PLCC | Microchip
The Microchip Technology PIC16LC74BT-04/L is an 8-bit CMOS microcontroller from the PIC16CXX mid-range family, offering 4K x 14 (7KB) of One-Time-Programmable (OTP) program memory, 192 bytes of RAM, and an integrated 8-channel 8-bit analog-to-digital converter. The device runs at a 4 MHz maximum clock speed from a 2.5V to 5.5V supply and is housed in a 44-pin PLCC (J-Lead) package, providing 33 digital I/O lines plus dedicated peripheral pins for I2C, SPI, and UART/USART connectivity.
An 8-bit microcontroller is a single-chip computer built around an 8-bit data bus, optimized for embedded control tasks such as motor control, sensor reading, and human-machine interface handling. Within the semiconductor taxonomy, an MCU is a subset of microcontrollers, which themselves belong to the broader class of processors and finally to integrated circuits. The PIC16CXX mid-range family occupies the position between PIC10/12/16 baseline devices and PIC17/18 high-performance devices, offering an attractive balance of instruction simplicity, code efficiency, and integrated peripherals for cost-sensitive consumer and industrial designs.
Key features include hardware peripherals such as a 16-bit Capture/Compare/PWM (CCP) module, an 8-channel 8-bit A/D converter, two 8-bit timers plus one 16-bit timer, a watchdog timer with its own on-chip RC oscillator, brown-out reset, power-on reset, and an in-circuit serial programming interface. The Harvard architecture uses a 14-bit instruction word with a reduced instruction set, yielding compact, low-power-density execution models that allow deterministic interrupt response in real-time control applications.
The architecture separates program and data memory using distinct buses: 7KB of OTP program memory (4K x 14) is accessed via a 14-bit program bus, while 192 bytes of data RAM are accessed via an 8-bit data bus. Integrated peripherals reduce external component count - for example, the on-chip A/D converter eliminates a separate ADC IC, and the on-chip brown-out detector eliminates an external voltage supervisor.
Typical applications include industrial control systems, white-goods and appliance controllers, automotive body and chassis subsystems, smart-card and security peripherals, and general-purpose embedded control platforms. Designers choose this family when deterministic interrupt response, compact code size, and integrated peripherals outweigh the throughput advantages of 16-bit or 32-bit MCUs.
When designing with this device, ensure the supply voltage stays within 2.5V to 5.5V, observe the maximum 4 MHz oscillator frequency at the L (low-power) speed grade, and reserve one I/O pin for in-circuit serial programming if field firmware updates are required. Use the on-chip brown-out reset to prevent code execution at unsafe supply voltages.
This page synthesizes distributor pricing, package details, drop-in alternatives from the same PIC16C7X family, and practical design notes that are not duplicated on the Microchip datasheet portal.
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