PSD4235G2V-90U

Overview

The PSD4235G2V-90U is a Flash in-system programmable (ISP) peripheral IC designed for 16-bit microcontrollers operating on a 5 V supply. It integrates 4 Mbit of Primary Flash memory and 256 Kbit of Secondary Flash memory, alongside 64 Kbit of SRAM. The device includes a Programmable Logic Device (PLD) with over 3000 gates, supporting both CPLD and DPLD configurations. It features 7 I/O ports with 52 individually configurable pins and supports concurrent read/erase/write operations. The component operates within a 70 ns access time and is housed in an 80-lead LQFP package.

Feature Summary

• Dual bank Flash memory: 4 Mbit Primary and 256 Kbit Secondary with concurrent operation capability
• Integrated PLD with over 3000 gates, including 16 output macrocells and 24 input macrocells
• In-system programming via JTAG serial port for full-chip programmability
• Internal page register to expand MCU address space by a factor of 256

Applications

• Memory expansion for 16-bit MCUs
• Complex logic decoding using DPLD/CPLD structures
• I/O port expansion and configuration for embedded systems

Procurement Notes

Verify the specific ordering suffix 'V-90U' against the manufacturer's current datasheet revision history, as legacy part numbers may have superseded variants or updated environmental compliance markings. Confirm availability status, as older generation PSD devices may be subject to discontinuation notices.

Selection Notes

Select this component when designing with 16-bit MCUs requiring a single-chip solution for code/data storage and complex glue logic. Ensure the design utilizes a 5 V supply rail. Verify that the target MCU supports the required bus interface protocols (multiplexed or non-multiplexed) compatible with the PSD4235G2 architecture.

Part Context

This device belongs to the PSD4235 family of Programmable System Devices from STMicroelectronics. These components bridge the gap between standard memory and discrete logic, reducing board space and assembly costs by integrating Flash, SRAM, and PLD resources into a single package for 16-bit microcontroller applications.

Replacement Considerations

Check for direct pin-compatible upgrades within the PSD4235 series, such as the PSD4235F1 variant, which offers similar functionality but may differ in voltage specifications or package options. Consult the official cross-reference guide for any discontinued sub-models.