ZPSD303B-90JI

Overview

The ZPSD303B-90JI is a low-cost field-programmable microcontroller peripheral from the PSD3XX family, designed to interface with 8-bit and 16-bit microcontrollers. It integrates up to 1 Mbit of UV EPROM and optional 16 Kbit SRAM into 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 buses, offers programmable I/O ports, and includes built-in security features. The component operates on a single 5 V supply and provides access times as fast as 70 ns.

Feature Summary

• Integrates high-performance user-configurable blocks of EPROM, programmable logic, and optional SRAM.
• Features two programmable logic arrays that replace discrete PLDs or decoders.
• Includes microcontroller logic that eliminates the need for external glue logic.
• Offers programmable power management with standby current reduction capabilities.

Applications

• Telecommunications equipment such as cellular phones and digital PBX systems
• Portable industrial equipment including measurement meters and data recorders
• Medical instrumentation devices like hearing aids and diagnostic tools

Procurement Notes

Verify the specific suffix configuration against the official STMicroelectronics selector guide to ensure compatibility with your voltage requirements and memory size needs. Confirm package availability as this component may be classified as obsolete in certain regions. Cross-reference the part number with authorized distributors to validate current production status and sourcing options.

Selection Notes

Select this component when interfacing with 8031-type architectures or other 8/16-bit MCUs requiring expanded address space. Consider the ZPSD variant if reduced AC and DC power consumption is critical for the application. Ensure the chosen package type matches the PCB layout constraints and thermal requirements of the final design.

Part Context

This part belongs to the PSD3XX family of field-programmable microcontroller peripherals. It serves as a drop-in replacement for discrete EPROM, SRAM, and logic components. The family is designed to simplify embedded control applications by integrating necessary interface logic and memory into a single package, reducing board space and design complexity.

Replacement Considerations

Direct replacements include other members of the PSD3XX family such as the PSD303 or ZPSD303 series, depending on required memory size and power specifications. Verify pin compatibility and logic configuration settings when substituting within the family to ensure seamless integration without hardware modifications.