PSD313B-70J

Overview

The PSD313B-70J is a low-cost field-programmable microcontroller peripheral from the PSD3XX family, manufactured by STMicroelectronics. It integrates up to 1 Mbit of UV EPROM and optional 16 Kbit SRAM into a single chip, eliminating the need for external glue logic. The device features two programmable logic arrays (PAD A and PAD B) with up to 18 inputs and 24 outputs, supporting complex address decoding and control signal generation. It offers flexible I/O port expansion and supports both multiplexed and non-multiplexed bus architectures for 8-bit and 16-bit microcontrollers. The component is available in a 44-pin TQFP package and provides programmable security and power management options.

Feature Summary

• Integrates high-performance user-configurable blocks of EPROM, programmable logic, and optional SRAM into one part.
• Features two programmable logic arrays that replace discrete PLDs or decoders, capable of decoding up to 1 MB of address without paging.
• Provides a powerful microcontroller interface that eliminates the need for external glue logic, including built-in address latches for multiplexed buses.
• Includes programmable I/O ports and input latches for microcontroller I/O port expansion and address signal handling.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official selector guide to confirm voltage range and SRAM availability. Confirm package type compatibility with PCB footprint requirements. Check current product status as older revisions may be obsolete. Ensure design tools are compatible with the specific device variant before procurement.

Selection Notes

Select this component when interfacing with 8-bit or 16-bit microcontrollers requiring expanded memory and custom logic. Choose based on required EPROM size and whether SRAM is needed. Consider the ZPSD variants for lower power consumption if battery operation is critical. Verify bus multiplexing requirements to ensure correct pin configuration.

Part Context

This device 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 'B' suffix typically denotes a specific speed grade or package variation within the standard 5V operating range, distinct from the low-voltage V-series or zero-power Z-series variants.

Replacement Considerations

Direct replacements within the same family include other PSD31x variants with matching memory sizes. For lower power applications, consider ZPSD313 equivalents. Ensure any substitute maintains compatibility with the target microcontroller's bus protocol and voltage levels.