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Z8420AB1 from ZILOG

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Z8420AB1

Manufacturer: ZILOG, SGS

Z80 PIO PARALLEL INPUT/OUTPUT CONTROLLER
Partnumber Manufacturer Quantity Availability
Z8420AB1 ZILOG, SGS 37 In Stock

Description and Introduction

Z80 PIO PARALLEL INPUT/OUTPUT CONTROLLER The part **Z8420AB1** is a **Zilog Z80 CPU** microprocessor. Here are its key specifications, descriptions, and features:  

### **Manufacturer Specifications:**  
- **Manufacturer:** Zilog  
- **Part Number:** Z8420AB1  
- **Type:** 8-bit Microprocessor  
- **Clock Speed:** 4 MHz (standard)  
- **Supply Voltage:** +5V DC  
- **Technology:** NMOS  
- **Package:** 40-pin DIP (Dual In-line Package)  
- **Operating Temperature Range:** 0°C to 70°C (commercial grade)  

### **Descriptions:**  
- The **Z8420AB1** is a member of the **Z80 CPU family**, designed for embedded and general-purpose computing applications.  
- It is a **single-chip microprocessor** with an 8-bit data bus and a 16-bit address bus, supporting up to **64KB of memory**.  
- Compatible with the **Z80 instruction set**, which includes enhancements over the Intel 8080.  

### **Features:**  
- **Enhanced Z80 Architecture**: Includes additional registers and instructions compared to the Intel 8080.  
- **158 Instructions**: Supports a wide range of operations, including bit manipulation, block transfers, and arithmetic/logic functions.  
- **On-Chip Refresh Circuitry**: Simplifies dynamic RAM interfacing.  
- **Two Interrupt Modes**: Maskable and non-maskable interrupt support.  
- **DMA-Compatible**: Allows direct memory access for high-speed data transfers.  
- **Low Power Consumption**: NMOS technology with efficient power usage.  

This part was widely used in **early personal computers, industrial control systems, and embedded applications**.

Application Scenarios & Design Considerations

Z80 PIO PARALLEL INPUT/OUTPUT CONTROLLER

Alternative Part Number

  • HD63B40P --: Pin-compatible CMOS UART/DUART with similar asynchronous communication functions, widely used as a Zilog Z8420 substitute.
  • SCN2681AC1N40 --: Dual asynchronous receiver/transmitter (DUART) offering comparable serial channel functionality and a common replacement path for Z8420 designs.
  • MC6850P --: Classic asynchronous communications interface adapter with similar UART role; usable in many legacy systems where the Z8420 is replaced with minor glue logic.
  • Z84C20AB1 --: Zilog Z84C20 is the CMOS version of the Z8420 PIO, pin-compatible and functionally equivalent, widely available and often a drop-in replacement.
  • Z84C2006PEG --: Z84C20 series PIO in a DIP package with 6 MHz rating, directly replaces the Z8420 parallel I/O function with lower power CMOS process.
  • Z8420APS --: Original Z8420 PIO from Zilog in a 40-pin DIP package, same NMOS architecture and pinout, suitable when exact original timing behavior is required.
  • Z8420AC1 --: Equivalent Z8420 PIO variant in a different package option, electrically compatible for most designs.
  • Z84C20AC1 --: CMOS Z80 PIO alternative with different naming, offering lower power and similar functionality.

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