HD63450RP8

Overview

The HD63450RP8 is a CMOS Direct Memory Access controller manufactured by Renesas Electronics Corporation, formerly Hitachi. It operates with a maximum clock frequency of 8 MHz and supports four independent DMA channels. The device features a 24-bit address bus width and a 16-bit external data bus width, ensuring compatibility with the Motorola 68000 family architecture. It is housed in a 64-pin Plastic Dual In-line Package (PDIP) with a shrink pitch (SDIP). The component requires a 5 V power supply and functions within an operating temperature range of -40 °C to +70 °C.

Feature Summary

• Supports cycle steal with or without hold, burst, and auto request transfer modes for flexible data movement.
• Provides fixed and rotational priority interrupt modes for managing multiple data transfer requests.
• Ensures system compatibility through adherence to the Motorola 68000 bus standard.

Applications

• Data acquisition systems requiring high-speed memory-to-peripheral transfers.
• Industrial control units utilizing 68000-based microprocessors.
• Communication interfaces needing efficient buffer management for serial data streams.

Procurement Notes

Verify the specific suffix RP8 against official Renesas documentation to confirm package type and temperature grade. Confirm RoHS compliance status as historical Hitachi parts may vary. Check for end-of-life notices or obsolescence warnings before finalizing procurement plans. Ensure the supplier provides original manufacturer packaging to prevent counterfeit components.

Selection Notes

Select this component when interfacing with legacy 68000 architectures requiring dedicated hardware DMA offloading. Consider the 8 MHz speed limit and 64-pin DIP form factor for board layout constraints. Evaluate if newer Renesas MCUs with integrated DMA controllers offer a more suitable long-term solution for new designs.

Part Context

This part belongs to the HD63450 series of DMA controllers originally developed by Hitachi and now managed by Renesas Electronics. It serves as a peripheral chip for microprocessor systems that lack sufficient internal DMA resources. The series is designed to reduce CPU overhead during high-volume data transfers between memory and I/O devices.

Replacement Considerations

Direct pin-compatible replacements are limited due to the specific legacy nature of the 68000 interface. Review Renesas's current peripheral families for integrated DMA solutions. Verify electrical compatibility if substituting with generic DMA controllers, noting potential differences in voltage levels and timing requirements.