5MHz; V(cc): -0.5 to +7V; programmable peripheral interface The UPD8255AC-2 is a programmable peripheral interface (PPI) chip manufactured by NEC. Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Manufacturer:** NEC (Nippon Electric Company)
- **Part Number:** UPD8255AC-2
- **Type:** Programmable Peripheral Interface (PPI)
- **Technology:** CMOS
- **Operating Voltage:** 5V
- **Speed Grade:** -2 (typically indicates a 2 MHz maximum operating frequency)
- **Package:** Likely a 40-pin DIP (Dual In-line Package) or similar
### **Descriptions:**
- The UPD8255AC-2 is a CMOS version of the industry-standard 8255 PPI chip, designed for interfacing peripheral devices with microprocessors.
- It provides three 8-bit I/O ports (Port A, Port B, and Port C) that can be configured for input or output operations.
- Port C can also be split into two 4-bit ports (Port C Upper and Port C Lower) for control or status signals.
- It supports multiple operating modes, including Basic Input/Output (Mode 0), Strobed Input/Output (Mode 1), and Bidirectional Bus (Mode 2).
### **Features:**
- **Three 8-bit I/O Ports:** Configurable as input or output.
- **Programmable Modes:** Supports Mode 0 (simple I/O), Mode 1 (strobed I/O), and Mode 2 (bidirectional bus).
- **Bit Set/Reset Capability:** Allows individual bits of Port C to be set or reset for control applications.
- **Compatibility:** CMOS version with similar functionality to the NMOS 8255.
- **Low Power Consumption:** Due to CMOS technology.
- **TTL Compatibility:** Interfaces with TTL logic levels.
This information is based on the general specifications of the 8255 PPI family and NEC's UPD8255AC-2 variant. For exact datasheet details, consult NEC's official documentation.
