AM685DL

Overview

The AM685DL is a 16-bit microprocessor manufactured by Advanced Micro Devices, housed in a 68-pin Plastic Quad Flat Package (PQCC) with a leadless chip carrier configuration. It operates at a maximum clock frequency of 20 MHz and features a 16-bit external data bus width alongside a 20-bit address bus. The device integrates a DRAM refresh control unit and a programmable interrupt controller. It supports low-power modes and includes two DMA channels and five external interrupt devices. The component is rated for commercial temperature ranges up to 85 °C.

Feature Summary

• Integrated DRAM refresh control unit for memory management
• Programmable interrupt controller for flexible event handling
• Dual DMA channel support for efficient data transfer

Applications

• Embedded systems requiring 16-bit processing capabilities
• Industrial control applications utilizing programmable interrupts
• Legacy hardware maintenance and replacement projects

Procurement Notes

Verify the specific package variant and manufacturing date code upon ordering, as this component may be classified as obsolete or last-time buy depending on current distributor inventory. Confirm RoHS compliance status, as original specifications indicate non-compliance. Ensure that the 68-pin LCC footprint matches the target PCB design before procurement.

Selection Notes

Select this processor for applications necessitating a 16-bit architecture with integrated memory control features. Consider the 20 MHz operational limit when designing system timing constraints. Evaluate the availability of compatible development tools and documentation, given the component's age. Verify thermal requirements against the specified 85 °C maximum operating temperature.

Part Context

This component belongs to the family of 16-bit microprocessors produced by AMD during the era of early embedded computing solutions. It represents a specialized integration of processing and peripheral control functions within a single package. The device was designed for applications where dedicated memory management hardware reduced system complexity.

Replacement Considerations

No public confirmed substitute part numbers are available.