PIC16LC56AT-04/SO - 8-Bit 4MHz OTP MCU, 1.5KB | Microchip
N.º de pieza: PIC16LC56AT-04/SO ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.95 | $4,95 |
| 10 | $4.45 | $44,50 |
| 100 | $3.85 | $385,00 |
| 500 | $3.25 | $1.625,00 |
| 1.000 | $2.75 | $2.750,00 |
PIC16LC56AT-04/SO Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer with an 8-bit data bus, ALU, program counter, on-chip memory, and I/O peripherals. The PIC16C5X family belongs to the microcontrollers -> embedded processors -> integrated circuits hierarchy, sitting alongside 8051, AVR, and other legacy 8-bit families. Fully static CMOS design means the clock can be stopped without losing register state, and the LC suffix indicates a low-power CMOS variant aimed at battery-friendly designs versus the standard PIC16C5X EPROM parts.
Key features of this device include 1.5KB OTP program memory, 25 bytes of general-purpose RAM, 12 bidirectional I/O pins organized in two ports (RA, RB), a watchdog timer with its own on-chip RC oscillator, power-on reset, and a 4 MHz maximum operating frequency. The 12-bit instruction word and 33-instruction RISC set allow most operations to complete in a single instruction cycle, giving the part an effective throughput of 4 MIPS at the 4 MHz clock rate. The architecture is Harvard-style, separating program and data memory buses.
The PIC16LC56A uses a fully static CMOS process with an on-chip oscillator and supports external oscillator modes. It includes a programmable code-protection bit, an 8-bit real-time clock/counter (RTCC) with programmable prescaler, and a 5-deep hardware stack. Because the 'T' suffix denotes tape-and-reel packaging and the '04' speed grade limits operation to 4 MHz, designers should confirm that timing requirements for serial bit-banging or timer-driven loops stay within the 4 MHz instruction budget.
Typical applications include low-cost consumer appliances, simple remote-control transmitters, basic sensor signal conditioning, LED lighting controllers, battery chargers, and replacement of discrete logic in glue-logic designs. The 12 I/O pins and small 18-pin SOIC footprint make it well-suited to compact, hand-held, or cost-sensitive products where processing needs are modest but predictable timing and low current draw matter.
When designing with this device, note that OTP memory can be programmed only once, so it is best suited to production-volume products or prototyping where code will be finalized before mask ROM is impractical. Provide a clean 5V (or 2.5V-6.25V per LC range) supply with a 0.1 uF decoupling capacitor close to VDD, and keep the MCLR pin either tied high through a 10 kohm resistor or driven by the reset source to prevent unintended resets.
This page synthesizes distributor pricing snapshots, same-package drop-in alternatives from the PIC16LC5X family, and practical design considerations beyond the manufacturer datasheet, giving engineers a single reference for sourcing and substitution decisions.
Alternativas directas para PIC16LC56AT-04/SO — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC16LC56AT-04/SO (mismo factor de forma y huella) — difiere en Program Memory Size, Watchdog Timer, Package, Core Architecture, Operating Temperature Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16LC56A-04/SO
✅ Sustitución directa✓ En stock
$0.78 / unidad
Ver hoja de datos →PIC16LC558T-04/SO
✅ Sustitución directa✓ En stock
$2.65 / unidad
Ver hoja de datos →PIC16LC558-04I/SO
✅ Sustitución directa✓ En stock
$1.1 / unidad
Ver hoja de datos →PIC16LC554T-04/SO
✅ Sustitución directa✓ En stock
$3.85 / unidad
Ver hoja de datos →PIC16LC554T-04I/SO
✅ Sustitución directa✓ En stock
$1.78 / unidad
Ver hoja de datos →PIC16LC56AT-04/SO Valores máximos y características eléctricas
| Core | PIC16C5X 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 1.5 KB (1K x 12) |
| RAM Size | 25 x 8 bytes |
| CPU Speed | 4 MHz |
| Instruction Set | 33 single-word/single-cycle instructions, 12-bit wide |
| Throughput | 4 MIPS (1 instruction cycle per clock) |
| I/O Pins | 12 |
| Timers | 1 x 8-bit RTCC with prescaler |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Stack Depth | 5 levels (hardware) |
| Oscillator | Internal RC and external oscillator modes |
| Encapsulado | 18-SOIC (SOP, 7.50 mm body) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +85C (commercial grade) |
| Nivel MSL | 1 (unlimited floor life) |
| Estado RoHS | Compliant |
Configuración de pines de PIC16LC56AT-04/SO
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | RTCC — Real-Time Clock/Counter input or I/O |
| Pin 4 | MCLR — Master Clear reset (active low) |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage |
| Pin 15 | OSC2 — Oscillator output / I/O |
| Pin 16 | OSC1 — Oscillator input / I/O |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Aplicaciones típicas
PIC16LC56AT-04/SO es adecuado para 6 aplicacións: Consumer Appliance Controllers, Remote Control Transmitters, LED Lighting Controllers, Battery Chargers and Power Management, Sensor Signal Conditioning and Glue Logic, Industrial Timer and Sequencer Modules.
Consumer Appliance Controllers
The PIC16LC56AT-04/SO fits low-cost consumer appliances such as coffee makers, toasters, and simple kitchen timers because its 1.5 KB OTP memory, 12 I/O pins, and 4 MHz throughput are sufficient for relay control and 7-segment LED multiplexing. The 2.5V-6.25V LC voltage range allows direct operation from a rectified mains-derived 5V rail. The 18-SOIC footprint keeps the PCB area small, while the watchdog timer with on-chip RC oscillator adds robustness against firmware lockups without external components.
Recomendado
Remote Control Transmitters
For IR/RF remote controls, the PIC16LC56AT-04/SO's low-power CMOS LC process and 4 MHz throughput make it well-suited to battery-powered handheld transmitters where standby current and code-density matter. The 33 single-cycle instructions provide tight loop timing for carrier generation, and the 25-byte RAM handles button-debounce state machines without external memory. The 12 I/O pins can directly drive an IR LED with current-limiting resistor and read a 4x3 keypad matrix without a decoder.
Recomendado
LED Lighting Controllers
In decorative LED lighting and signage, the PIC16LC56AT-04/SO drives Charlieplexed or multiplexed LED arrays through its 12 I/O pins, producing chase, fade, and color-mixing patterns via software PWM. The 4 MIPS throughput is enough to refresh several hundred LEDs without flicker, and the OTP memory holds a fixed lighting sequence once the design is finalized. Its small 18-SOIC package and 5V operation simplify integration into mains-powered lighting drivers.
Recomendado
Battery Chargers and Power Management
The PIC16LC56AT-04/SO can manage NiCd, NiMH, or small Li-ion charger topologies by sampling voltage dividers with the comparator or ADC inputs and PWM-driving a MOSFET through one of its I/O pins. The low-power LC process reduces sleep current to support long standby life on battery packs, and the watchdog timer prevents charger lockup if the firmware hangs. Because OTP is one-time programmable, the firmware must be fully validated before charger production.
Recomendado
Sensor Signal Conditioning and Glue Logic
The PIC16LC56AT-04/SO replaces discrete 74HC logic by providing configurable I/O behavior, conditional delays, and basic arithmetic for sensor conditioning boards. Its 25-byte RAM and 4 MHz throughput handle 8-bit sensor data scaling, linearization, and digital filtering before passing results to a host processor over UART bit-banged in firmware. The 18-SOIC package and 5V operation match the form factor and supply of legacy 74-series glue logic, simplifying retrofits.
Recomendado
Industrial Timer and Sequencer Modules
In industrial timing and sequencing applications, the PIC16LC56AT-04/SO delivers predictable 1-microsecond-per-instruction timing using its 4 MIPS throughput, with the RTCC timer and watchdog managed in hardware. The 5-level hardware stack is sufficient for nested interrupt-like sequencing tasks, and the 12 I/O pins can drive relays, optocouplers, and indicator LEDs directly. Industrial temperature grade operation is supported across the LC voltage range.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16LC56AT-04/SO — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16LC56A-04/SO | PIC16LC558T-04/SO | PIC16LC558-04I/SO | PIC16LC554T-04/SO | PIC16LC554T-04I/SO |
|---|---|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 1.5 KB (1K x 12) OTP | 1.5 KB (1K x 12) OTP | 3 KB (2K x 12) OTP | 3 KB (2K x 12) OTP | 0.75 KB (512 x 12) OTP | 0.75 KB (512 x 12) OTP |
| RAM Size | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 12 | 12 | 12 | 12 | 12 | 12 |
| Temperature Grade | Commercial (0C to +70C) | Commercial | Commercial | Industrial (-40C to +85C) | Commercial | Industrial (-40C to +85C) |
| Lifecycle Status | Obsolete | Active | Obsolete | Obsolete | Obsolete | Obsolete |
Diferenciadores clave
- Active production status among same-package family (frente a PIC16LC558T-04/SO)
- Larger program memory option within same package (frente a PIC16LC554T-04/SO)
- Commercial temperature grade availability (frente a PIC16LC558-04I/SO)
Notas de diseño
Place a 0.1 uF decoupling capacitor as close as possible to the VDD pin (pin 14) and a bulk capacitor (4.7-10 uF) on the same supply rail. The PIC16LC56AT-04/SO's LC low-power CMOS process draws only a few hundred microamps in active mode at 4 MHz, so a small LDO or 5V rail is sufficient. MCLR (pin 4) should be tied to VDD through a 10 kohm resistor to allow in-circuit programming and reset.
Keep the crystal or resonator traces between OSC1 (pin 16) and OSC2 (pin 15) short and symmetric to reduce parasitic capacitance that would shift the oscillation frequency away from 4 MHz. If the internal RC oscillator mode is selected, OSC1 and OSC2 become general-purpose I/O pins (RA0 and RA1). Provide a ground pour under and around the MCU to improve EMI immunity, especially in industrial control environments.
Because OTP memory can be programmed only once, ensure the final firmware is fully validated before production programming - there is no way to fix bugs after the first write. Avoid using stack depth greater than 5 levels, since the PIC16C5X has a fixed 5-level hardware stack and overflow will cause silent code corruption. Finally, verify that the chosen temperature grade (commercial vs industrial -04I) matches the deployment environment before laying out the PCB.
Información de cumplimiento
RoHS and lead-free compliance confirmed by Microchip product page; AEC-Q100 not applicable for consumer-grade microcontrollers; halogen-free status not explicitly stated in verified data.
