PSD4235G2V-12UI

Overview

The PSD4235G2V-12UI is a Flash in-system programmable (ISP) peripheral IC designed for 16-bit microcontrollers operating on a single 5 V supply. It integrates dual-bank Flash memories, including 4 Mbit of primary memory and 256 Kbit of secondary memory, alongside 64 Kbit of SRAM. The device features over 3000 gates of PLD logic with macrocells and provides 52 individually configurable I/O pins across seven ports. It supports concurrent read/write operations and includes an internal page register to expand the MCU address space by a factor of 256.

Feature Summary

• Dual-bank Flash architecture: 4 Mbit Primary (8 sectors) and 256 Kbit Secondary (4 sectors) supporting concurrent operation.
• Integrated PLD with over 3000 gates, comprising 16 output macrocells (OMCs) and 24 input macrocells (IMCs).
• 52 individually configurable I/O pins supporting MCU I/Os, PLD I/Os, latched address outputs, and special functions.
• Built-in JTAG compliant serial port enabling full-chip In-System Programmability (ISP) and testing.

Applications

• Peripheral expansion for 16-bit MCUs requiring non-volatile storage.
• Systems utilizing separate program and data spaces.
• Complex memory mapping applications using the page register.
• In-circuit programming environments via JTAG interface.

Procurement Notes

Verify the specific suffix 'V-12UI' against official STMicroelectronics documentation to confirm voltage tolerance and package variations. Confirm current availability status as older PSD series components may be discontinued or subject to long-term supply agreements. Ensure compatibility with the target 16-bit MCU bus interface before procurement.

Selection Notes

Select this component when a 16-bit MCU requires integrated Flash, SRAM, and PLD resources without external chips. The 70 ns access time suits standard 16-bit bus speeds. Verify that the target application utilizes a 5 V supply, as this device does not support lower voltage levels. Ensure the design accommodates the 80-LQFP package dimensions.

Part Context

This part belongs to the PSD4235G2 family of programmable system devices. These peripherals bridge the gap between simple memory chips and complex FPGAs, offering deterministic timing for embedded controllers. The G2 variant specifically targets 16-bit architectures, distinguishing it from 8-bit or 32-bit counterparts in the broader PSD portfolio.

Replacement Considerations

Direct replacements within the same family include the PSD4235F2 or PSD4235G3 variants, provided speed grades and package types match. Cross-family migration to newer STMicroelectronics programmable solutions should be evaluated based on pin compatibility and software toolchain support.