XL71055 – Programmable Peripheral Interface (PPI) – Xinluda

The XL71055 is an 8255-compatible programmable peripheral interface (PPI), or parallel interface unit, providing three 8-bit I/O ports (24 programmable I/O lines) for parallel data transfer in microprocessor systems. Available by RFQ from Pacific Component Xchange.

The XL71055 is a programmable peripheral interface (PPI) of the well-established 8255 / µPD71055 family of parallel interface units. It serves as a general-purpose interface between a host microprocessor and external peripheral devices, providing flexible, software-configurable parallel I/O. The 71055 family is a CMOS implementation of the industry-standard 8255 architecture, valued for its low power consumption and broad software compatibility with legacy and embedded designs.

Devices in this family organize their I/O into three independently programmable 8-bit ports (Port A, Port B, and Port C, where Port C can be split into two 4-bit halves), delivering 24 programmable I/O lines that interface to the host through an 8-bit bidirectional data bus with standard read/write and chip-select control. The architecture supports the three classic operating modes of the 8255 family: Mode 0 (basic input/output), Mode 1 (strobed input/output with handshaking), and Mode 2 (bidirectional bus).

Key Features

• 8255-compatible programmable peripheral interface (parallel interface unit)
• Three 8-bit I/O ports (Port A, Port B, Port C) — 24 programmable I/O lines
• Port C selectable as two independent 4-bit ports
• Three operating modes: Mode 0 (basic I/O), Mode 1 (strobed I/O with handshaking), Mode 2 (bidirectional bus)
• 8-bit bidirectional data bus with standard read/write and chip-select control
• CMOS technology for low power consumption
• DIP-40 through-hole package

Note: The XL71055 brand attribution and a manufacturer-specific datasheet could not be independently verified at the time of listing. The features above reflect the standard 8255 / µPD71055 PPI architecture. All electrical parameters and the exact manufacturer part marking should be confirmed against the controlled datasheet prior to design-in. Pacific Component Xchange can help confirm the correct part and supply documentation on request.

Applications

• Microprocessor and microcontroller parallel I/O expansion
• Industrial control and automation interfaces
• Legacy system maintenance, repair, and replacement (8255 PPI drop-in)
• Instrumentation and data-acquisition front ends
• Keyboard, display, and printer/peripheral interfacing

Why Source XL71055 from Pacific Component Xchange

The XL71055 is a hard-to-find, legacy-architecture logic device with little to no authorized-distributor stock. Pacific Component Xchange is an independent distributor specializing in obsolete, end-of-life, and allocation-constrained components like the XL71055. We help engineers and procurement teams keep legacy and embedded designs in production when standard channels come up empty.

Every order is backed by our commitment to authenticity and quality assurance, with inspection and counterfeit-avoidance processes to protect your build. Because the exact manufacturer marking on this part can vary, our team will verify part equivalence with you before shipment. We offer global shipping and responsive sourcing for hard-to-find parts. Request a quote (RFQ) today and our team will confirm availability, lead time, and pricing for the quantities you need.