PSD312B-70J

Overview

The PSD312B-70J is a low-cost field-programmable microcontroller peripheral from the PSD3XX family, manufactured by STMicroelectronics. It integrates up to 512 Kbit of UV EPROM and optional 16 Kbit SRAM into a single chip. The device features two programmable logic arrays (PAD A and PAD B) with up to 18 inputs and 24 outputs, supporting up to 40 product terms. It provides 19 individually configurable I/O pins for port expansion, address decoding, and latched address output. The component supports both multiplexed and non-multiplexed bus interfaces, eliminating external glue logic. It operates on a single 5 V supply with an access time of 70 ns.

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 replacing PLDs or decoders with extensive input/output capabilities.
• 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 availability status as this component may be classified as obsolete. Ensure compatibility with existing design requirements before procurement.

Selection Notes

Select this component when interfacing with 8-bit or 16-bit microcontrollers requiring expanded address space and programmable logic. Consider the ZPSD variants if lower power consumption is critical. Verify memory size requirements against the available 256 Kbit to 1 Mbit EPROM options.

Part Context

This part belongs to the PSD3XX family of low-cost field-programmable microcontroller peripherals. The family includes various configurations with different memory sizes and power management features. The PSD312B variant specifically offers 512 Kbit of EPROM capacity within this integrated solution architecture.

Replacement Considerations

Check for direct substitutes within the PSD3XX family such as PSD302B or PSD313B depending on memory needs. Evaluate ZPSD3XX versions for improved power efficiency if applicable. Consult official datasheets for pinout and electrical parameter compatibility.