PSD311B-70J

Overview

The PSD311B-70J is a low-cost field-programmable microcontroller peripheral from the PSD3XX family, designed to interface with 8- and 16-bit microcontrollers. It integrates up to 256 Kbit of UV EPROM and optional 16 Kbit SRAM, alongside two programmable logic arrays (PAD A and PAD B) for address decoding and control logic. The device supports single-supply operation at 5 V ±10% and offers access times as fast as 70 ns. Key features include programmable I/O ports, page logic for address space expansion, and built-in security modes. It is available in 44-pin packages including PLDCC, CLDCC, PQFP, and TQFP.

Feature Summary

• Integrates high-performance user-configurable blocks of EPROM, programmable logic, and optional SRAM into a single chip.
• 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 programmable power management options to reduce standby current consumption.

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 monitoring equipment
• Computer peripherals for notebooks and palm-top computers

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm package type and suffix codes match design requirements. Check for obsolescence status as this family may be discontinued. Request original datasheets and test reports for quality assurance. Ensure proper handling procedures are followed during storage and assembly.

Selection Notes

Select based on required memory size, logic complexity, and voltage specifications. Choose between standard and ZPSD variants depending on power consumption needs. Verify compatibility with target microcontroller bus architecture. Consider package availability and form factor constraints. Evaluate software tool support for configuration and programming.

Part Context

This component belongs to the PSD3XX family of programmable microcontroller peripherals. It serves as an alternative to discrete logic components, simplifying system design by integrating address decoding, port expansion, and memory functions. The family includes various configurations with different memory sizes and power management features.

Replacement Considerations

Consult official STMicroelectronics documentation for verified replacement part numbers within the same product family. Ensure functional equivalence regarding pinout, electrical characteristics, and logical capabilities before substitution.

FAQ

What is the maximum address space supported by the PSD311B-70J?

The device can decode up to 1 MB of address space without paging, utilizing its programmable logic arrays.

Can the PSD311B-70J interface with multiplexed buses?

Yes, it supports both multiplexed and non-multiplexed address/data buses through configurable internal latches and port settings.

How does the ZPSD variant differ from the standard PSD3XX?

ZPSD versions incorporate zero-power technology that significantly reduces DC current drain by entering standby mode when inputs are stable.