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Z84C4310AEG

Z80 CMOS SIO/3, 10MHz, dual UART, 2Mbps, 44-LQFP, serial I/O controller

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Manufacturer Part：

Z84C4310AEG

Package：

LQFP-44 (10 x 10 x 1.6 mm)

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Description

Product Overview

The Z84C4310AEG is a Z80 CMOS Serial Input/Output (SIO/3) controller from Zilog (now IXYS/Littelfuse). Operating at 10MHz clock frequency, this UART-based serial communication controller supports dual full-duplex channels with programmable baud rate generation and supports data rates up to 2Mbps. The device is housed in a 44-pin LQFP package, operates from a single 5V supply, and is designed for I/O controller applications in embedded Z80-based systems.

Key Specifications

Core Architecture Z80
Clock Speed 10 MHz
Interface UART (2 channels)
Data Rate Up to 2 Mbps
Supply Voltage 4.5V to 5.5V
Channels 2 Full-Duplex Serial
Package 44-LQFP (10 x 10 mm)
Operating Temperature -40°C to +105°C
Application I/O Controller
Process CMOS

Features

  • Dual independent full-duplex serial channels with separate control
  • Programmable baud rate generator for each channel
  • Supports asynchronous, byte-synchronous, and bit-synchronous protocols
  • Interrupt prioritization with built-in interrupt vectoring
  • Z80 bus-compatible interface for seamless integration

Applications

  • Industrial control and automation systems
  • Serial communication expansion for Z80-based embedded designs
  • Legacy system maintenance and retrofit
  • Data acquisition and telemetry systems
  • Point-of-sale terminal serial interfaces

The Zilog Z84C4310AEG is a member of the Z80 CMOS peripheral family, specifically the Z84C43 Serial Input/Output (SIO/3) controller. This device provides two independently programmable full-duplex serial communication channels with built-in baud rate generators, making it the serial communication backbone for Z80-based embedded systems. Operating at 10MHz clock frequency, the SIO/3 supports data rates up to 2Mbps across both asynchronous and synchronous communication protocols. The CMOS implementation provides low power consumption while maintaining full Z80 bus compatibility. Each channel supports asynchronous (with 1, 1.5, or 2 stop bits), byte-synchronous (mono-sync, bi-sync, SDLC/HDLC), and bit-synchronous modes. The device features sophisticated interrupt handling with built-in interrupt vector generation and priority management, reducing CPU overhead for serial communication tasks.

The Z84C4310AEG operates as a dual-channel serial communication controller on the Z80 bus. Each of the two serial channels (A and B) has independent transmit and receive logic with separate baud rate generators. In asynchronous mode, the transmitter adds start and stop bits to parallel data from the CPU, while the receiver strips these bits and checks for framing errors. In synchronous mode, the device handles bit-oriented (SDLC/HDLC) or byte-oriented (BISYNC) protocols with zero insertion/deletion and CRC generation/checking. The CPU accesses the SIO through a set of write registers (for configuration) and read registers (for status) per channel. The interrupt logic generates interrupts for conditions such as transmit buffer empty, receive character available, special receive conditions, and external/status changes, with automatic interrupt vectoring to reduce CPU response time.

Pin Name Type Function
1 D0 I/O Data bus bit 0
2-8 D1-D7 I/O Data bus bits 1-7
9 CLK Input System clock (10MHz max)
11 IEI Input Interrupt enable input (daisy chain)
12 IEO Output Interrupt enable output (daisy chain)
13 INT Output Interrupt request to CPU
19 RxDA Input Channel A receive data
21 TxDA Output Channel A transmit data
30 RxDB Input Channel B receive data
32 TxDB Output Channel B transmit data
  • Industrial automation and process control serial communication
  • Z80-based embedded system serial port expansion
  • Legacy system maintenance and retrofit applications
  • Data acquisition and telemetry serial interfaces
  • Point-of-sale and banking terminal serial communication
Manufacturer Part Number Package Notes
Zilog Z84C4320AEG LQFP-44 20MHz clock version
Zilog Z84C4008PEG DIP-40 8MHz DIP version, SIO/0
Zilog Z84C4310PEG DIP-40 10MHz DIP version
NXP SCC2692AC1A44 PLCC-44 Dual UART, Z80 compatible
Exar XR88C681J-F PLCC-44 Dual UART with Z80 bus interface
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