PSD834F2V-20JI

Overview

The PSD834F2V-20JI is a Flash In-System Programmable (ISP) peripheral for 8-bit microcontrollers, manufactured by STMicroelectronics. It operates on a single 3.3 V ±10% supply and features 2 Mbit of primary Flash memory organized into eight uniform sectors, alongside 256 Kbit of secondary Flash memory in four sectors. The device includes 64 Kbit of battery-backed SRAM and over 3,000 gates of programmable logic, comprising a Decode PLD (DPLD) and a Complex PLD (CPLD). It provides 27 reconfigurable I/O ports and supports an enhanced JTAG serial port for full-chip ISP capabilities.

Feature Summary

• Dual bank Flash memories: 2 Mbit primary and 256 Kbit secondary with concurrent read/write/erase operations
• Integrated programmable logic: Over 3,000 gates including DPLD and CPLD with 16 output macrocells
• In-System Programming (ISP): Built-in JTAG compliant serial port for complete device programming
• High endurance: 100,000 erase/write cycles for Flash memory and 1,000 for PLD

Applications

• Embedded designs requiring first-time In-System Programming (ISP)
• Applications needing complex address decoding for internal memory blocks
• Systems requiring simultaneous READ and WRITE operations to the device

Procurement Notes

Verify the specific ordering suffix 'J' corresponds to the required package type and temperature grade against official documentation. Confirm that the component meets current environmental compliance standards such as RoHS before procurement. Check for availability status as legacy components may have limited stock or discontinuation notices.

Selection Notes

Select this component when interfacing with 8-bit MCUs using multiplexed or non-multiplexed buses. Ensure the design utilizes a 3.3 V supply voltage compatible with the specified ±10% tolerance. Consider the need for concurrent code execution from secondary Flash while updating primary Flash to simplify IAP implementation without external boot EPROMs.

Part Context

This part belongs to the PSD family of memory systems for microcontrollers, designed to bring In-System Programmability to Flash memory and programmable logic. It addresses challenges in managing discrete Flash devices by integrating decoding, paging, and ISP capabilities into a single chip, reducing development time and manufacturing costs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.