PIC16LC77-04I/PQ
PIC16LC77-04I/PQ - 8-bit 4MHz 14KB OTP MCU 44-MQFP | Microchip
The Microchip Technology PIC16LC77-04I/PQ is a low-cost, high-performance CMOS fully-static 8-bit microcontroller from the PIC16C7X family, integrating an on-chip 10-bit analog-to-digital converter and 14KB (8K x 14) of One-Time-Programmable (OTP) program memory. The device operates at up to 4MHz, delivers 33 digital I/O lines, includes 368 bytes of RAM, and is housed in a 44-pin Metric Quad Flat Pack (MQFP, 10x10mm) surface-mount package rated for the industrial temperature range (-40C to +85C). It is supplied in a tube packaging format, indicated by the trailing PQ suffix, and runs from a 2.5V to 5.5V VDD supply typical for the LC low-voltage CMOS variant of this mid-range PIC architecture.
What is a PIC mid-range 8-bit MCU? It is a RISC-based microcontroller from Microchip's PIC family (peripheral interface controller) that uses a Harvard architecture with separate program and data buses, a small instruction set executed in single cycles (except branches), and on-chip peripherals including timers, a 10-bit ADC, and digital I/O. The PIC16C7X line (PIC -> microcontroller -> 8-bit MCU -> embedded microcontroller -> semiconductor) is the mid-range tier that bridges the baseline and enhanced PIC families, providing a balance of code density, peripheral integration, and cost for industrial and consumer embedded applications.
Key features include 14KB of OTP program memory, 368 bytes of data RAM, an 8-level hardware stack, an integrated 10-bit multi-channel ADC, three timers (Timer0, Timer1, Timer2), a USART for serial communications, and a watchdog timer with its own on-chip RC oscillator. The CMOS design supports low-power operation with a typical standby current in the microampere range and offers fully static operation that allows the clock to be stopped without losing register contents. The 33 I/O pins can source/sink up to 25mA per pin, enabling direct drive of LEDs and small relays without external drivers.
Technical depth: the device uses a 14-bit wide instruction word with 35 single-cycle instructions (excluding branches, which take two cycles), delivering roughly 4 MIPS at 4MHz clock. The LC suffix denotes the low-voltage, low-power CMOS process variant optimized for battery-powered and portable designs, while the 04 speed grade specifies the maximum 4MHz oscillator input. Brown-out reset (BOR) circuitry and a programmable code-protection scheme are mask options often specified at order time; this /PQ variant is the lead-free industrial-grade offering in the 44-MQFP tray package.
Typical applications include industrial process control and instrumentation, HVAC sensor interface boards, motor control front-ends, automotive body and chassis subsystems (non-safety), low-cost consumer appliances, embedded control modules with analog sensing, and battery-powered remote sensor nodes. The integrated ADC, generous I/O count, and PIC mid-range peripheral mix make it well suited for mixed-signal control loops where a single chip must read sensors and drive actuators.
Design consideration: ensure the VDD decoupling network uses a 0.1uF ceramic capacitor placed within 5mm of the supply pins, and that the MCLR reset circuit includes the recommended 10k pull-up and a 0.1uF cap when in-circuit serial programming is required. Programming requires a Microchip PIC programmer (e.g., PICkit 3, MPLAB ICD) because OTP memory is one-time programmable and cannot be erased - prototypes should be developed with the JW (windowed) or Flash equivalent part to allow iterative debugging.
This page synthesizes distributor pricing, drop-in PIC16 family alternatives, and practical OTP vs Flash migration guidance not found in a single datasheet reference.
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