PSD854F2V-90M

Overview

The PSD854F2V-90M is a Flash In-System Programmable (ISP) peripheral IC designed for 8-bit microcontrollers, operating at 90 MHz with a 5V single supply. It integrates dual-bank flash memory up to 2 Mbit primary and 256 Kbit secondary, allowing concurrent read/erase/write operations. The device features 27 reconfigurable I/O ports, a PLD with over 3000 gates, and a built-in JTAG serial port for full-chip programmability. It includes an internal page register to expand the MCU address space by a factor of 256 and supports battery-backed SRAM.

Feature Summary

• Dual-bank flash architecture: Up to 2 Mbit primary (8 sectors) and 256 Kbit secondary (4 sectors) with concurrent operation capability.
• Integrated PLD: Over 3000 gates with CPLD (16 Output Macrocells) or DPLD configuration options.
• Reconfigurable I/Os: 27 individually configurable pins supporting MCU I/O, PLD I/O, latched address output, and open-drain outputs.
• In-System Programming: Built-in JTAG compliant serial port enables efficient manufacturing testing and programming via low-cost FlashLINK cable.

Applications

• Flash ISP peripherals for 8-bit MCUs
• Systems requiring expanded address space via page register
• Applications needing concurrent code execution and data storage updates

Procurement Notes

Verify the specific suffix 'V-90M' against official STMicroelectronics documentation to confirm voltage grade and speed bin accuracy. Ensure the 52-PQFP package matches the required footprint. Confirm that the 5V±10% supply requirement aligns with the target system design. Check for any specific qualification grades or environmental compliance standards listed in the final datasheet.

Selection Notes

Select this component when an 8-bit MCU requires external flash memory with simultaneous read-write capabilities to optimize performance. The integrated PLD reduces board space by handling custom logic or chip select decoding. Ensure the application utilizes the JTAG interface for in-system programming needs. Verify that the 27 reconfigurable I/Os meet the pin count requirements for the specific MCU interconnect.

Part Context

The PSD854F2V-90M belongs to the PSD85x family of Flash ISP peripherals from STMicroelectronics. This series provides flexible memory and logic solutions for 8-bit microcontroller systems. It is part of a lineup that includes variants like PSD853F2 and PSD854F2, offering different memory configurations and gate counts while maintaining compatibility with standard 8-bit MCU architectures.

Replacement Considerations

Direct replacements within the same family include PSD854F2 variants with compatible speed grades. Verify pinout and electrical specifications before substitution. Cross-reference with PSD853F2 if lower gate count or different memory size suffices for the application.