PIC18LC801T-I/L
PIC18LC801T-I/L - 8-bit 25MHz ROMless MCU, 84-PLCC | Microchip
The Microchip Technology PIC18LC801T-I/L is an 8-bit RISC ROMless microcontroller built on the PIC18 enhanced architecture, offering up to 25 MHz CPU performance in a 84-pin PLCC (J-Lead) surface-mount package supplied on tape and reel. The device integrates 1.5 KB of general-purpose SRAM (1536 bytes), 37 digital I/O lines, and external memory interfaces that allow program code to be stored in off-device memory, making it ideal for volume applications where firmware is supplied through external boot memory. The 'LC' suffix indicates the low-voltage (2.0V-5.5V) variant designed for battery and power-conscious designs, while the 'I' suffix denotes the industrial -40C to +85C operating temperature grade.
An 8-bit microcontroller (MCU) is a small, self-contained computing element that integrates a CPU, RAM, non-volatile program memory, and peripherals onto a single die. The PIC18 family is Microchip's high-performance 8-bit line, employing a 16-bit opcode modified Harvard architecture and a RISC instruction set that allows most instructions to execute in a single clock cycle. Within that hierarchy, ROMless parts such as the PIC18LC801 omit on-chip program memory entirely; instead, they fetch every instruction from an external EPROM/Flash or mask-ROM device through a parallel memory port, which is the typical topology for cost-sensitive high-volume products where firmware is stable and memory density is high.
The defining features of this device include 37 GPIO pins, 1.5 KB of on-chip SRAM, a 25 MHz maximum clock, an external memory bus capable of addressing up to 2 MB, two 8-bit timer/counters, three 16-bit timer/counters, two Capture/Compare/PWM modules, two USART modules with LIN support, an MSSP (SPI/I2C) port, a 10-bit ADC, two analog comparators, and a watchdog timer. The low-voltage LC silicon permits operation from a single Li-ion cell or two alkaline cells, and the industrial temperature grade supports outdoor and factory-automation deployments.
The PIC18LC801 uses Microchip's nanoWatt power-management technology to provide multiple idle and sleep modes, reducing quiescent current to a few microamps in sleep. The 84-pin PLCC package offers through-hole-style robust leads while still being surface-mountable on the same footprint, simplifying wave-solder prototyping and rework. Programmable weak pull-ups on most I/O pins and configurable interrupt edge selection reduce external component count.
Typical applications include industrial control front-ends, sensor hubs, low-voltage consumer appliances, automotive body controllers (non-safety), smart-metering peripherals, and any volume product where external program memory is preferred over on-chip flash. The PIC18LC801 is also a frequent companion controller to a host processor or DSP, providing deterministic 8-bit glue logic, keypad scanning, and display driving in mixed-architecture systems.
When designing with this part, ensure the external memory bus timing matches the selected program memory device, as access-time mismatches cause fetch stalls. Provide adequate decoupling (100 nF + 10 uF) near both VDD and AVSS pins and reserve MCLR pull-up, and observe the 5.5V absolute maximum on any pin to prevent latch-up in noisy industrial environments.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, and gives engineers a concise entry-point for platform reuse across the PIC18LC801 family.
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