PIC16C55-XTI/SS
PIC16C55-XTI/SS - 8-bit OTP MCU 768B 24 RAM 20 I/O SSOP28
The Microchip Technology PIC16C55-XTI/SS is an 8-bit CMOS RISC microcontroller from the PIC16C5X family, packaged in a 28-pin SSOP (5.30 mm body width). It integrates 768 bytes (512 x 12) of One-Time Programmable (OTP) EPROM program memory and 24 bytes of general-purpose data RAM, with up to 20 digital I/O pins arranged across multiple ports. The XTI suffix designates the industrial temperature grade (-40C to +85C) and the 4 MHz maximum clock rate, while the /SS suffix confirms the SSOP-28 surface-mount package.
An 8-bit microcontroller (MCU) is a small single-chip computer built around an 8-bit data path, integrating a CPU, program memory, data RAM, I/O peripherals, and timers in one package. MCUs sit below microprocessors (MPUs) in the system hierarchy and serve as the embedded decision-makers in appliances, sensors, motor controllers, and many other everyday devices. The PIC16C5X family belongs to the original baseline PIC architecture, sharing the same 12-bit wide instruction word across PIC16C54, PIC16C55, PIC16C56, and PIC16C57 devices, with each successive part offering progressively larger program memory.
Key features of the PIC16C55-XTI/SS include a 12-bit instruction set with 8-bit data path, two-level deep hardware call stack, direct/indirect/relative addressing modes, an 8-bit real-time clock/counter (TMR0) with programmable prescaler, and a watchdog timer for reliable unattended operation. The device runs from a 2.5V to 6.25V supply (industrial extended range per PIC16C5X datasheet), supports up to 4 MHz external clock input, and delivers 33 single-word instructions with two-cycle conditional branches.
Architecturally, the PIC16C55 uses Harvard-style separate program and data buses, allowing instruction fetch and operand read to occur in a single oscillator cycle. This gives the part a 1 MIPS rating at 4 MHz clock. The CMOS process delivers low power consumption (typical < 2 mA active at 5V/4 MHz, < 1 uA standby) suitable for battery-influenced designs. The 20 I/O pins can source/sink up to 20-25 mA per pin, allowing direct LED drive and small-signal transistor switching.
Typical applications for PIC16C55-XTI/SS include simple appliance controllers (coffee makers, fans, blenders), automotive interior accessories, low-end sensor interface boards, educational microcontroller learning kits, and hobbyist / replacement-board designs where the classic PIC16C5X instruction set is already embedded in the firmware. Because the part ships as OTP, it is best suited for low- to medium-volume production runs where mask-ROM cost cannot be justified.
When designing with the PIC16C55-XTI/SS, pay close attention to the OTP programming window: once programmed, the bit cannot be erased, so prototype code must be burned into ceramic-windowed PIC16C55/JW parts first. The industrial-temperature XTI grade enables field deployment in unheated enclosures but limits the maximum oscillator to 4 MHz - do not substitute XT or HS grade parts without re-validating timing margins. For new designs, Microchip recommends the flash-based PIC16F54 or PIC16F57 as modern drop-in successors with in-circuit programmability.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
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