728980JG

Overview

The Renesas 728980JG is a digital bus switch IC designed for microprocessor interface applications. It features a 256 x 256 configuration supporting an 8-bit data bus and output channels. The device utilizes ST-BUS technology with 125μs wide frames, each containing 32, 8-bit channels. It includes eight serial inputs (RX0-7) and eight serial outputs (TX0-7). The internal serial interface clock operates at 4.096 MHz. Received serial data is converted to parallel format by on-chip serial-to-parallel converters and stored in a 256-position Data Memory.

Feature Summary

• Supports 256-channel digital switching with 8-bit data bus capability
• Integrates on-chip serial-to-parallel conversion for data processing
• Utilizes ST-BUS frame structure for synchronized channel management

Applications

• Microprocessor interface systems
• Digital bus switching networks
• Parallel data distribution architectures

Procurement Notes

Verify the manufacturer designation carefully as sources list both IDT and Renesas due to corporate acquisition history. Confirm the specific suffix JG corresponds to the PLCC-44 package variant. Ensure compatibility with the required 4.096 MHz clock frequency and 8KHz frame pulse input for proper operation of the internal counter mechanism.

Selection Notes

Select this component when a high-density digital bus switch is required for microprocessor interfaces. The device is suitable for applications needing parallel data storage and conversion from serial streams. Consider the PLCC-44 package constraints and the specific timing requirements of the ST-BUS protocol during system design integration.

Part Context

This component belongs to the family of digital bus switch integrated circuits originally developed by Integrated Device Technology (IDT). Following Renesas Electronics' acquisition of IDT, these products are now marketed under the Renesas brand. The 728980 series provides specialized hardware for managing complex digital signal routing and buffering in high-performance computing environments.

Replacement Considerations

Check for direct equivalents within the IDT 728980 series or compatible ST-BUS compliant switches. Verify pinout compatibility with the PLCC-44 package if substituting with other manufacturers' devices.