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STMicroelectronics PSD4235G2V-12UI
- Part No.:
- PSD4235G2V-12UI
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 80-LQFP
- Datasheet:
-
PSD4235G2V-12UI.pdf
- Description:
- IC PROG PERIPH IC 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,001
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Product details
Overview
PSD4235G2V-12UI from STMicroelectronics is a Flash-based programmable system device (PSD) integrating dual-bank Flash memory (4 Mbit primary + 256 Kbit secondary), 64 Kbit SRAM, CPLD/DPLD logic (3000+ gates), and 7 configurable I/O ports (52 pins) for 16-bit MCUs operating at 5 V. It supports concurrent read/erase/write operations, JTAG in-system programming, and page register–enabled 256× address space expansion in embedded control systems.
For engineers reviewing the PSD4235G2V-12UI datasheet, PSD4235G2V-12UI pinout, PSD4235G2V-12UI application, or PSD4235G2V-12UI equivalent, key selection criteria include concurrent Flash bank operation capability, integrated PLD configurability for chip select decoding, 5 V MCU bus interface compatibility (80C196/80C51XA/MC683xx), and ECOPACK® LQFP80 packaging with JTAG ISP support.
Technical Context
The PSD4235G2V-12UI implements a unified architecture where Flash memory, SRAM, and PLD blocks share a common MCU bus interface with dedicated memory select signals and internal page register mapping. Its dual-bank Flash enables true background erase/write while executing code from the alternate bank - critical for firmware updates without system interruption.
Its PLD subsystem comprises two independent units: a 16-output macrocell CPLD for I/O logic and timing, and a user-configurable DPLD for internal chip select decoding. All 52 I/O pins are individually software-configurable across MCU I/O, PLD I/O, latched address output, or special function roles - including open-drain mode - enabling flexible peripheral interfacing without external glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash Memory | 4 Mbit (32K × 16) in 8 uniform sectors; enables reliable firmware partitioning and sector-level protection. |
| Secondary Flash Memory | 256 Kbit with 4 sectors; used for boot code, configuration data, or parameter storage independent of main program space. |
| SRAM | 64 Kbit (32K × 16); provides fast, low-latency data storage for real-time MCU variables and stack operations. |
| PLD Capacity | Over 3000 equivalent gates; supports complex address decoding, interrupt arbitration, and custom logic without external CPLDs. |
| Memory Access Time | 70 ns for both Flash and SRAM; ensures timing compliance with 14 MHz 80C196 or 16 MHz 80C51XA MCU buses. |
| Supply Voltage | 5 V ±10%; compatible with legacy 5 V industrial and automotive microcontroller platforms. |
| Endurance & Retention | 100,000 Flash erase/write cycles and 15-year data retention; suitable for field-upgradable embedded systems with long service life. |
Pinout & Package
PSD4235G2V-12UI is housed in an ECOPACK®-compliant LQFP80 package (80-lead, thin quad flat). Pin assignments follow STMicroelectronics' standardized layout for PSD family devices, with dedicated JTAG (TCK/TMS/TDI/TDO on Port E), MCU bus interface (AD0–AD15, A0–A15, RD, WR, CS), PLD I/Os, and power/ground distribution optimized for signal integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AD0–AD15 | Multiplexed Address/Data Bus | Shares physical pins for lower 16-bit address and data; requires external latch (e.g., 74HC373) for demultiplexing in 80C196/80C51XA modes. |
| A0–A15 | Non-multiplexed Address Bus | Direct 16-bit address input for non-multiplexed MCU interfaces (e.g., MC683xx); eliminates need for external address latch. |
| RD, WR, CS | MCU Control Signals | Synchronize read/write cycles and chip selection; support both separate program/data space and combined memory map configurations. |
| TCK, TMS, TDI, TDO | JTAG Boundary-Scan Interface | Enable full in-system programming, debug access, and boundary-scan testing without removing the device from PCB. |
| PE4 (Ready/Busy) | Flash Operation Status Flag | Indicates active erase/write cycle; allows MCU to poll status or trigger interrupts instead of fixed delay timing. |
| RESET | Asynchronous Reset Input | Resets all internal registers, PLD states, and memory controllers; initializes device to known state after power-up or fault recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Concurrent Dual-Bank Flash Operation | Read from one Flash bank while erasing/writing the other - enables zero-downtime firmware updates and real-time data logging. |
| Configurable 52-Pin I/O Ports | All pins software-selectable as MCU I/O, PLD I/O, latched address outputs, or open-drain drivers - reduces external level shifters and buffers. |
| Integrated Page Register | Expands effective MCU address space by factor of 256 via 8-bit page register; eliminates need for external address multiplexing logic. |
| Programmable Power Management Unit (PMU) | Supports automatic power-down mode triggered by idle bus activity; reduces active current consumption during standby intervals. |
| PLD-Based Chip Select Decoding | DPLD block implements user-defined memory/peripheral decode logic - replaces discrete 74-series logic and simplifies board layout. |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
|
Use Scenario: Real-time PWM generation, sensor polling, and CAN message handling in 80C196-based motor drives. IC Role / Device Role / Timing Role: System-on-package replacing discrete Flash, SRAM, CPLD, and address decoder; manages 16-bit data bus timing with 70 ns access. Use Value: Eliminates 4–6 discrete components per controller, reducing BOM cost and PCB area while enabling in-field firmware patching via JTAG. |
Use Scenario: Central body electronics module managing door locks, lighting, and window controls using 80C51XA MCU. IC Role / Device Role / Timing Role: Unified memory and logic resource providing boot code (Secondary Flash), runtime variables (SRAM), and peripheral decode (DPLD). Use Value: Enables secure, field-upgradable boot firmware with hardware-level sector protection and 15-year data retention for automotive lifecycle requirements. |
| Medical Infusion Pump | Legacy Industrial PLC I/O Module |
|
Use Scenario: Safety-critical drug delivery system requiring verified firmware execution and tamper-resistant configuration storage. IC Role / Device Role / Timing Role: Primary Flash stores certified application code; Secondary Flash holds calibration parameters and audit logs with independent write protection. Use Value: Meets IEC 62304 Class C software requirements via hardware-enforced Flash sector locking and JTAG security disable. |
Use Scenario: Retrofitting aging 16-bit PLC backplanes with enhanced memory and logic without redesigning CPU bus interface. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete EPROM + PAL combinations; maintains identical 5 V, 70 ns timing and pin-compatible bus signaling. Use Value: Extends product lifecycle by >10 years with same footprint and electrical behavior - no firmware or PCB changes required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable system device applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD4255G2V-12UI | Same architecture but with 8 Mbit primary Flash (64K × 16) and identical PLD/SRAM specs. | Required when application firmware exceeds 4 Mbit or demands larger boot partition. | Select only if additional Flash capacity is confirmed necessary; pin- and register-compatible upgrade path. |
| PSD813F2V-12UI | Single-bank Flash (4 Mbit), no secondary Flash, reduced PLD (2000 gates), same 64 Kbit SRAM and LQFP80 package. | Suitable for simpler designs without background programming or boot/data separation needs. | Lower-cost option when concurrent Flash operation and dual-bank isolation are not required. |
Compared with PSD4255G2V-12UI, the PSD4235G2V-12UI offers optimal balance of Flash density and cost for mid-complexity 16-bit MCU systems; versus PSD813F2V-12UI, it delivers essential dual-bank reliability and enhanced PLD resources for robust peripheral management.
Availability
PSD4235G2V-12UI is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, and medical infusion pump designs requiring stable component supply, long-term lifecycle support, and JTAG-programmable Flash integration.
Supply support for PSD4235G2V-12UI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader specializing in microcontrollers, analog ICs, and programmable logic devices for industrial, automotive, and consumer applications.
The PSD (Programmable System Device) product line was designed to consolidate Flash memory, SRAM, and PLD logic into single-chip solutions for 16-bit MCU-based systems - reducing board complexity and enabling field-upgradable firmware architectures.
FAQ
Does PSD4235G2V-12UI support in-application programming (IAP)?
Yes. The device supports true in-application programming via its dual-bank Flash architecture: code executes from one bank while the other is erased or programmed. This requires proper sector locking, status flag polling (PE4 or DQ7), and adherence to the unlock sequence defined in the datasheet. No external hardware reset is needed during IAP.
What MCU families are natively supported by the PSD4235G2V-12UI bus interface?
The device directly supports 80C196, 80C186, 80C51XA, MC683xx, MC68HC16, H8/300, MMC2001, and C16x families through configurable bus timing and memory mapping modes. Each is validated in the datasheet with timing diagrams, address decode examples, and register setup sequences.
Can the PLD logic be reconfigured independently of Flash memory contents?
Yes. The CPLD and DPLD blocks are programmed separately via JTAG using distinct configuration bitstreams. PLD logic retains its state across Flash erase/write cycles and power cycles. Configuration is stored in dedicated on-chip nonvolatile cells, not in Flash memory.
Is the LQFP80 package RoHS-compliant and lead-free?
Yes. The PSD4235G2V-12UI carries the ECOPACK® designation, indicating full compliance with RoHS Directive 2011/65/EU and lead-free soldering compatibility. The package uses matte tin terminal finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements.
PSD4235G2V-12UI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 80-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Programmable Peripherals IC
- Applications:
- 16-Bit MCU Peripherals
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-LQFP (12x12)
- Grade:
- -
- Qualification:
- -
PSD4235G2V-12UI FAQ
1.How can I place an order for PSD4235G2V-12UI through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD4235G2V-12UI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PSD4235G2V-12UI reliable?
The price and inventory of PSD4235G2V-12UI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD4235G2V-12UI is usually 5 days.
3.What payment methods are accepted for PSD4235G2V-12UI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD4235G2V-12UI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD4235G2V-12UI?
PSD4235G2V-12UI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD4235G2V-12UI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PSD4235G2V-12UI?
For technical support, including PSD4235G2V-12UI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD4235G2V-12UI requirements.
6.How does Aetrix verify that PSD4235G2V-12UI is sourced from the original manufacturer or authorized distributors?
All PSD4235G2V-12UI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PSD4235G2V-12UI meets industry standards.
7.What is the process for return or replacement of PSD4235G2V-12UI?
All PSD4235G2V-12UI units undergo pre-shipment inspection (PSI). If there is an issue with PSD4235G2V-12UI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PSD4235G2V-12UI part is unused and in its original packaging.
Return procedure for PSD4235G2V-12UI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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