PSD854F2-70M

Overview

The PSD854F2-70M is a Flash In-System Programmable (ISP) peripheral designed for 8-bit microcontrollers. It provides 2 Mbit of parallel flash memory in a 52-pin PQFP package. The device operates at a maximum frequency of 43.48 MHz with a 5 V supply voltage and supports an operating temperature range from 0°C to 70°C.

Feature Summary

• Supports in-system programming for non-volatile memory applications
• Interfaces directly with 8-bit microcontroller systems via parallel bus
• Provides integrated flash storage for code and data retention

Applications

• Embedded firmware storage for 8-bit MCUs
• In-system programmable peripheral modules
• Industrial control system code storage

Procurement Notes

Verify the exact suffix (e.g., MI, JI, 70M) against the manufacturer's official datasheet to ensure correct speed grade and package variant. Confirm RoHS compliance status as specifications may vary by revision. Check lifecycle status, as this component may be obsolete or superseded by newer series. Validate pinout compatibility before integration into existing PCB layouts.

Selection Notes

Select this component when an 8-bit MCU requires external parallel flash with ISP capabilities. Ensure the system voltage matches the 5 V requirement. Verify that the 43.48 MHz access speed meets the application timing constraints. Consider the 52-PQFP package dimensions for mechanical fit. Compare against newer STMicroelectronics ISP peripherals if higher density or speed is needed.

Part Context

This part belongs to the PSD854F2 family of Flash ISP peripherals from STMicroelectronics. These components are designed to extend the memory capabilities of 8-bit microcontrollers without requiring complex external interfaces. The family includes variants with different speed grades and package options, all sharing the same core ISP functionality and parallel interface architecture.

Replacement Considerations

The PSD854F2-70J is a documented variant within the same family. Verify electrical compatibility and pinout equivalence before substitution. Newer ISP peripheral models may offer improved performance but require schematic review.