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UPD71055GB-10-3B4
UPD71055GB-10-3B4
| Part Number | UPD71055GB-10-3B4 |
|---|---|
| Manufacturer | Renesas Electronics (Formerly NEC) |
| Category | Integrated Circuits (ICs) > Interface – I/O Expanders / Programmable Peripheral Interface |
| Description | High-performance CMOS Parallel Interface Unit (PPI) operating up to 10 MHz, featuring 24 programmable I/O pins compatible with industry-standard 8255 architectures, housed in a 44-pin plastic QFP footprint. |
| Stock Status | In Stock |
| Origin | Original Factory |
Product Overview
The UPD71055GB-10-3B4 is a high-speed, low-power Programmable Peripheral Interface (PPI) IC from legacy NEC, now supported by Renesas. It maintains full register compatibility with standard 8255 PPI chips, offering flexible 24-channel parallel I/O expansion for 8/16-bit microprocessors. Rated for 10MHz maximum bus clock, the chip splits I/O resources into three 8-bit ports (Port A/B/C), configurable in three operation modes: basic IO, strobed handshake, bidirectional transfer. Built with low-noise CMOS process, it features low standby current and full TTL logic compatibility. Packaged in 44-pin low-profile plastic QFP (-3B4 tray spec), it is widely used for embedded control, legacy industrial interfaces and multi-channel data transmission equipment.
Core Advantages
Industry Standard 8255 Software Compatibility
100% register-level compatible with classic 8255 PPI, directly reuse existing firmware and source code without driver or logic redesign.
Advanced 10 MHz High-Frequency Operation
Optimized internal timing supports 10MHz parallel bus operation, cutting bus wait cycles and improving throughput for high-speed burst data transmission.
Highly Adaptable Multi-Mode Configuration Matrix
24 I/O pins support flexible grouping, covering asynchronous latching, single-bit IO control and full bidirectional master-slave communication modes.
Low-Power, Resilient CMOS Design Node
Low power consumption CMOS architecture with latch-up protection, stable long-term operation in sealed industrial control enclosures.
Key Specifications
| Brand | Renesas Electronics / NEC High-Performance Microprocessor Peripheral Series |
|---|---|
| RoHS Status | RoHS Compliant / Lead-Free Solder Construction Certified |
| EDA/CAD Model | 3D STEP Models, Schematic Symbols, and Pinout Footprint Configurations available upon request |
| Warranty | 1-Year Standard Quality Warranty |
| Package / Case | 44-QFP |
| Mounting Type | Surface Mount Technology (SMD/SMT Lead-Free Reflow Solder Line Compatibility) |
| Surface Marking / Silkscreen | D71055GB Marking |
| Total Programmable I/O Pins | 24 I/O Lines (Configurable as Port A, Port B, and split 4-bit upper/lower Port C sections) |
| Maximum Clock Frequency Boundary | 10 MHz nominal execution threshold speed |
| Operational Mode Formats | Mode 0 (Basic Input/Output), Mode 1 (Strobed Input/Output), Mode 2 (Bidirectional Bus Interface) |
| Logic Bus Interface | 8-Bit Parallel Multiplexed/Non-multiplexed Microprocessor Bus Compatible |
| Data Bus Width | 8-bit Parallel Microcontroller Interface |
| Storage Capacity | 4KB On-chip Dual-Port SRAM |
| Baud Rate Range | 9.6kbps ~ 12Mbps with auto baud detection |
| Crystal Requirement | 48MHz External Crystal Oscillator |
| Supported Protocol | PROFIBUS DP-V0 / DP-V1 / DP-V2 |
| Compatible Replacement Chip | Fully pin & software drop-in replacement for Siemens SPC3 |
| Operating Power Supply Range ($V_{CC}$) | 5.0 V ±10% stable single rail operation boundary |
| I/O Signal Compatibility | Direct Standard TTL and CMOS logic signaling level matching |
| Operating Temperature Range | -40°C to +85°C (Extended Industrial Thermal Operating Parameters) |
Typical Applications
- Embedded Automation Systems, Programmable Logic Controllers (PLCs), and Custom I/O Expansion Boards
- Legacy Industrial Panel Displays, Human-Machine Interfaces (HMIs), and Multi-Key Matrix Scanners
- Parallel Printer Interfacing, High-Speed Data Buffering Links, and Dedicated Centronics Bridges
- Automated Test Equipment (ATE), Specialized Lab Instrumentation Racks, and Data Logging Modules
- Traffic Signaling Hardware Arrays, Environmental Monitoring Enclosures, and Relay Control Nodes
Order & Shipping Info
| Minimum Order Quantity (MOQ) | 1 Piece |
|---|---|
| Shipping Time | Shipped within 1-2 business days |
| Delivery Time | 3-7 working days worldwide |
| Shipping Methods | DHL, UPS, FedEx, EMS |
| Payment Methods | T/T (Bank Transfer), PayPal, Credit Card, Western Union |
Technical Support
For datasheet, sample requests, stock check, or bulk pricing, please use the Quick Inquiry form. We will reply within 24 hours.
Frequently Asked Questions
Q1: Are UPD71055GB-10-3B4 chips 100% original new?
A: Yes. All stock are brand-new original Renesas/NEC chips. Every batch passes strict incoming QC with full lot traceability, packed in standard ESD trays to avoid pin oxidation and damage.
Q2: What do “-10” and “-3B4” mean in the part number?
A: “-10” stands for max 10MHz working clock speed; “-3B4” refers to 44-pin lead-free QFP tray packaging spec.
Q3: Can this IC directly replace 8255 / 82C55 chips?
A: It is fully register-compatible for firmware reuse. But it adopts 44-pin SMD QFP package, cannot directly replace 40-pin DIP through-hole 8255 without PCB redesign.
Q4: How to get datasheet, pinout docs and bulk price?
A: Fill in the inquiry form on this page with your project demand and quantity. Our technical team will send full documents and tiered quotation within 24 working hours.
Q5: Is sample order available for testing?
A: Yes, we support small sample orders for prototype testing.
Q6: What is the minimum order quantity?
A: MOQ is 1 piece, no bulk purchase limit.
Q7: How long is the delivery lead time?
A: In-stock items ship within 1-2 working days; global delivery takes 3-7 days via DHL/UPS/FedEx.
Q8: What’s the warranty period of these ICs?
A: We provide 1-year standard quality warranty for all original chips.
Q9: Can I return defective goods?
A: For quality problems caused by the products themselves, we support after-sales replacement according to our service policy.
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