UPD71055C

Product Overview

UPD71055C is a NEC (Renesas) CMOS programmable parallel interface unit (PIU) designed for microcomputer systems. The device provides three independent 8-bit I/O ports with programmable operating modes, allowing flexible parallel data transfer and peripheral control. With low power CMOS technology, single 5V power supply operation and compatibility with microprocessor systems, UPD71055C is widely used in industrial controllers, automation equipment, measurement systems and legacy computer interface applications. 

Key Features

• Manufacturer: NEC Electronics / Renesas Electronics

• Part Number: UPD71055C

• Device Type: Programmable Parallel Interface Unit

• Product Category: Peripheral Interface IC

• Technology: CMOS

• Number of I/O Ports: 3 Ports

• I/O Configuration: Three 8-bit programmable I/O ports

• Total I/O Lines: 24 Lines

• Operating Voltage: 4.5V to 5.5V

• Supply Voltage: 5V Typical

• Operating Modes: Three programmable operation modes

• Mode 0: Basic input/output mode

• Mode 1: Strobed input/output with handshaking

• Mode 2: Bidirectional bus mode

• Bit Manipulation Command: Supported

• Microprocessor Interface: Compatible with NEC microcomputer systems

• Data Transfer: Parallel data transfer interface

• Power Consumption: Low-power CMOS operation

• Clock Requirement: No external clock required

• Package Type: DIP-40

• Number of Pins: 40 pins

• Mounting Type: Through Hole

• Package Form: Dual Inline Package

• Operating Temperature: -40°C to +85°C (industrial version varies)

• Application: Parallel interface expansion

• Typical Applications: Industrial controllers, printers, test equipment, measurement systems and embedded computer interfaces

• RoHS Status: Verify according to production batch and manufacturer option

• Lifecycle Status: Legacy / obsolete product family

• Ordering / Packaging Note: Verify NEC marking, DIP-40 package, date code and authenticity before procurement.

Applications

UPD71055C is designed to expand parallel I/O capability in microprocessor-based systems. Typical applications include industrial automation equipment, control panels, printer interfaces, data acquisition systems, laboratory instruments and legacy embedded systems requiring programmable GPIO expansion. 

Quality & Sourcing

Antrex Electronics can support UPD71055C sourcing with stock verification, RFQ quotation, package inspection, marking verification, date code review and shipment arrangement. Customers should confirm package type, manufacturer marking and system compatibility before procurement.

Quality support can include visual inspection, authenticity verification, electrical testing coordination and third-party inspection when required. Industrial equipment manufacturers, repair centers, automation suppliers and electronic component buyers are welcome to submit sourcing requests for UPD71055C and other legacy interface IC products.