PSD835G2V-12UI

Overview

The PSD835G2V is a Flash Programmable System Device (PSD) designed for 8-bit microcontrollers, operating on a single 3 V ±10% supply. It integrates 4 Mbits of primary Flash memory organized into eight uniform sectors and 256 Kbits of secondary Flash with four sectors, alongside 64 Kbits of SRAM. The device supports concurrent read operations while erasing or writing to the alternate memory bank. Key electrical parameters include a standby current as low as 25 µA and access times of 90 ns or 120 ns depending on voltage conditions. It features over 3000 gates of PLD logic, 52 reconfigurable I/O ports, and an enhanced JTAG serial port for in-system programming.

Feature Summary

• Dual-bank Flash architecture: 4 Mbits primary and 256 Kbits secondary memory enabling concurrent read/write operations.
• Integrated PLD with over 3000 gates, supporting CPLD and DPLD configurations with 16 output and 24 input macrocells.
• In-system programmability via built-in JTAG compliant serial port using standard FlashLINK cables.
• High endurance specifications: 100,000 erase/write cycles for Flash memory and 1,000 cycles for PLD.

Applications

• Expanding address space for 8-bit MCUs using the internal page register.
• Replacing complex discrete logic circuits with configurable PLD macrocells.
• Implementing in-application programming (IAP) for firmware updates in embedded systems.

Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors. Confirm package integrity for the LQFP80 form factor. Check revision history against Doc ID 10585 Rev 3. Ensure compatibility with existing 8-bit MCU bus interfaces. Validate power supply requirements match the 3 V ±10% specification.

Selection Notes

Select this device when interfacing with 8-bit microcontrollers requiring expanded non-volatile storage and flexible logic gating. Consider the 4 Mbit primary capacity for code storage and the 256 Kbit secondary bank for data logging. Evaluate the 52 I/O pins for peripheral expansion needs. Assess the need for concurrent memory operations to optimize system throughput.

Part Context

This component belongs to the PSD family of Flash Programmable System Devices from STMicroelectronics. It serves as a bridge between legacy 8-bit microcontrollers and modern programmable logic requirements. The device combines memory expansion capabilities with general-purpose logic functions, reducing board space and component count compared to discrete solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility if considering alternative vendors. Check if newer PSD variants offer increased gate counts or memory densities.