PSD4256G6V-10UI

Overview

The PSD4256G6V-10UI is a Flash in-system programmable (ISP) peripheral IC designed for 8-bit or 16-bit microcontrollers. It integrates dual-bank Flash memory, including 8 Mbits of primary and 512 Kbits of secondary Flash, alongside 256 kbits of SRAM and a PLD with over 3000 gates. The device supports concurrent read/erase/write operations and features 52 configurable I/O pins. It operates on a single 3 V supply, delivering access times of 90 ns at 3.3 V and 100 ns at 3 V.

Feature Summary

• Dual-bank Flash architecture with 8 Mbits primary and 512 Kbits secondary memory
• Integrated CPLD/DPLD with over 3000 gates and 256 kbits SRAM
• 52 individually configurable I/O ports supporting multiple modes
• In-system programming via JTAG interface

Applications

• Expanding address space for 8-bit MCUs using the page register
• Replacing complex discrete logic with integrated PLD decoding
• Implementing secure boot code storage with sector protection

Procurement Notes

Verify the specific suffix 'U' corresponds to the ECOPACK LQFP80 package as documented. Confirm that the '-10' speed grade matches the required 90 ns or 100 ns access time specifications for your target voltage. Ensure compatibility with the PSDsoft development tools for ISP configuration.

Selection Notes

Select this component when an 8-bit or 16-bit MCU requires expanded non-volatile memory and flexible logic integration without external components. Consider the 52 I/O pin count and PLD macrocells for custom bus decoding and peripheral control needs.

Part Context

This part belongs to STMicroelectronics' PSD family of Flash peripherals. It serves as a bridge between legacy 8/16-bit MCUs and modern system requirements by combining memory expansion, logic flexibility, and power management in a single surface-mount package.

Replacement Considerations

Check for updated PSD series devices with higher density or different package options. Verify if newer MCU architectures can integrate these functions internally, reducing BOM complexity.