PSD834F2V-20MI

Overview

The PSD834F2V-20MI is a Flash Programmable System Device (PSD) designed for 8-bit microcontrollers, operating on a single 3.3V supply. It integrates 2 Mbit of primary Flash memory organized into eight uniform sectors and 256 Kbit of secondary Flash memory divided into four sectors. The device also includes 64 Kbit of battery-backed SRAM. Logic capabilities are provided by over 3,000 gates comprising a Decode PLD (DPLD) and a Complex PLD (CPLD), alongside 27 reconfigurable I/O ports. Key electrical specifications include 100,000 erase/write cycles for Flash memory and 1,000 cycles for the PLD array.

Feature Summary

• Integrated dual Flash memories: 2 Mbit primary sectorized memory and 256 Kbit secondary boot/data memory.
• Programmable logic architecture with DPLD for address decoding and CPLD with 16 output macrocells.
• Supports In-System Programming (ISP) via JTAG serial interface for full chip reconfiguration.
• Features 64 Kbit SRAM with battery backup capability via VSTBY pin to retain data during power loss.

Applications

• Embedded designs requiring in-circuit programmability for 8-bit MCUs.
• Systems needing concurrent code execution from secondary Flash while updating primary Flash.
• Applications requiring complex address decoding and peripheral logic integration without external components.

Procurement Notes

Verify that the specific suffix 'MI' corresponds to the PQFP52 package as indicated in the datasheet figures. Confirm the voltage grade matches the 3.3V±10% requirement. Check for preliminary status updates or revision history changes that may affect final parameter validation before production use.

Selection Notes

Select this component when an 8-bit MCU requires integrated non-volatile memory and programmable logic in a single package. Ensure the design utilizes a 3.3V supply rail. Consider the 27 configurable I/O pins for bus interfacing or general purpose control. Verify that the required logic complexity fits within the 3,000 gate capacity of the combined DPLD and CPLD structures.

Part Context

This part belongs to the STMicroelectronics PSD family, which combines Flash memory and programmable logic for microcontroller peripherals. The PSD834F2V specifically targets applications needing high-density storage and flexible logic implementation. It supports various 8-bit MCU families including Intel, Motorola, Philips, and Zilog architectures through its flexible bus interface.

Replacement Considerations

Direct replacements must match the 52-pin PQFP package and 3.3V operation. Other members of the PSD834F2x series may offer different memory densities or logic capacities. Verify pin compatibility and register mapping if substituting with other PSD variants.