PSD312B-70M

Overview

The PSD312B-70M is a field-programmable microcontroller peripheral from the PSD3XX family, designed to interface with 8- and 16-bit microcontrollers. It integrates up to 512 Kbit of UV EPROM and optional 16 Kbit SRAM within a single chip. The device features two programmable logic arrays (PAD A and PAD B) for address decoding and control logic, eliminating external glue logic. It supports multiplexed and non-multiplexed bus architectures with configurable I/O ports. The component operates on a single 5 V supply and offers access times as fast as 70 ns for both memory and logic functions.

Feature Summary

• Integrates high-performance user-configurable blocks of EPROM, programmable logic, and optional SRAM into one part.
• Provides a powerful microcontroller interface that eliminates the need for external glue logic.
• Features two programmable logic arrays capable of decoding up to 1 MB of address without paging.
• Includes built-in security locks to protect the device and PAD decoding configuration.

Applications

• Telecommunications equipment such as cellular phones, digital PBX, and FAX machines
• Portable industrial equipment including industrial control systems and measurement meters
• Medical instrumentation devices like hearing aids and diagnostic tools
• Computer peripherals for notebooks, portable PCs, and palm-top computers

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and voltage range. Confirm current availability status as older revisions may be obsolete. Ensure compatibility with existing design requirements before procurement.

Selection Notes

Select this component when interfacing with 8- or 16-bit microcontrollers requiring expanded address space and programmable logic. Choose based on required EPROM size and whether SRAM integration is necessary. Consider the ZPSD variants if lower power consumption is a priority.

Part Context

This part belongs to the PSD3XX family of low-cost field-programmable microcontroller peripherals. The family includes standard, SRAM-less, and low-power ZPSD variations. These components are designed to replace discrete PLDs and decoders in embedded control applications.

Replacement Considerations

Check for direct equivalents within the PSD3XX family such as PSD312R or ZPSD312. Verify pinout compatibility and logic capacity matches for seamless replacement in existing designs.