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STMicroelectronics PSD4235G2-70U
- Part No.:
- PSD4235G2-70U
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 80-LQFP
- Datasheet:
-
PSD4235G2-70U.pdf
- Description:
- IC PROG PERIPH IC 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,203
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Product details
Overview
PSD4235G2-70U 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 MCU systems operating at 5 V. It supports concurrent read/erase/write operations and in-system programming via JTAG.
For engineers reviewing the PSD4235G2-70U datasheet, PSD4235G2-70U pinout, PSD4235G2-70U application, or PSD4235G2-70U equivalent, key selection criteria include dual-bank Flash concurrency, PLD macrocell count (16 OMCs + 24 IMCs), 70 ns memory access time, LQFP80 package compatibility, and JTAG-based ISP support for embedded MCU co-design.
Technical Context
The PSD4235G2 implements a tightly coupled architecture where the MCU bus interface directly maps to Flash, SRAM, and PLD blocks via programmable decode logic. Its dual-bank Flash enables real-time firmware updates without halting execution-critical for industrial controllers requiring zero-downtime field upgrades.
Its integrated CPLD provides 16 output macrocells and 24 input macrocells for custom chip-select generation, address latching, and peripheral glue logic, while the DPLD handles internal memory block selection. The page register extends the MCU's 16-bit address space by 256×, enabling access to full 4 Mbit Flash without external banking logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash | 4 Mbit (8 × 32K x 16 sectors); enables full firmware storage for mid-complexity 16-bit MCUs like 80C196 or C16x. |
| Secondary Flash | 256 Kbit (4 sectors); dedicated for boot code or parameter storage with independent erase control. |
| SRAM | 64 Kbit; provides fast data scratchpad accessible at same 70 ns timing as Flash, eliminating wait states. |
| PLD Capacity | 3000+ gates; integrates glue logic for memory mapping, interrupt routing, and peripheral interfacing-reducing external logic IC count. |
| Memory Access Time | 70 ns; matches timing requirements of legacy 16-bit MCUs (e.g., 80C186, MC683xx) without added wait states. |
| Supply Voltage | 5 V ±10%; compatible with standard 5 V industrial and automotive MCU power rails. |
| Endurance | 100,000 Flash erase/write cycles; supports frequent field firmware updates over product lifetime. |
| Data Retention | 15 years; ensures long-term reliability in unpowered storage for industrial control applications. |
Pinout & Package
PSD4235G2-70U is housed in an ECOPACK®-compliant LQFP80 (80-lead, thin quad flat package), optimized for thermal performance and PCB density in space-constrained industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC, GND | Power supply terminals | Dual VCC/GND pairs ensure stable 5 V operation and low-noise grounding for mixed-signal PSD operation. |
| A0–A15 | Address inputs | 16-bit multiplexed/non-multiplexed address bus interface supporting 80C51XA, 80C196, and MC683xx MCUs. |
| D0–D15 | Data bus | 16-bit bidirectional data path; supports byte-enable (BE0–BE3) for 8-bit MCU compatibility. |
| RD, WR, CS | Control signals | Standard read/write/chip-select handshake for seamless integration with common 16-bit MCU buses. |
| TCK, TMS, TDI, TDO | JTAG interface | IEEE 1149.1-compliant test and programming port enabling in-circuit flash programming and boundary scan. |
| PE4 (Ready/Busy) | Flash status indicator | Signals active erase/write operations-allows MCU to poll or interrupt on completion without fixed delays. |
| PORT A–G (52 pins) | Configurable I/O | Each pin individually assignable as MCU I/O, PLD I/O, latched address output, or special function (e.g., reset, clock). |
Key Features
| Feature | Design Value |
|---|---|
| Concurrent Flash operation | Read from one bank while erasing/writing the other-enables live firmware patching without system stall. |
| Page register expansion | 256× address space extension allows full 4 Mbit Flash access using standard 16-bit MCU addressing. |
| Integrated CPLD/DPLD | 16 OMCs + 24 IMCs replace discrete logic for chip select decoding, address latching, and interrupt arbitration. |
| JTAG ISP support | Built-in IEEE 1149.1 port enables low-cost FlashLINK cable programming-eliminates expensive UV erasers or socket programmers. |
| Open-drain I/O configuration | 52 pins configurable as open-drain outputs-supports wired-AND bus signaling and I²C-compatible interfaces. |
Applications
| Industrial PLC Controller | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Real-time logic sequencing and sensor data logging in factory automation cabinets. IC Role / Device Role / Timing Role: Acts as unified memory + glue logic hub-hosting firmware in Primary Flash, storing calibration tables in Secondary Flash, and managing I/O expansion via PLD. Use Value: Eliminates external SRAM, Flash, and CPLD chips, reducing BOM cost and board area while enabling field-upgradable firmware. | Use Scenario: Bootloader and safety-critical control code execution in engine management systems. IC Role / Device Role / Timing Role: Provides secure, protected boot code storage in Secondary Flash with hardware write-protection, while Primary Flash hosts main application. Use Value: 100,000 erase/write cycles and 15-year data retention ensure reliable reprogramming across vehicle service life. |
| Medical Diagnostic Equipment | Legacy Industrial HMI Terminal |
Use Scenario: Firmware update and configuration storage in portable ultrasound or patient monitor units. IC Role / Device Role / Timing Role: Serves as nonvolatile memory subsystem with concurrent read/erase capability-allowing background firmware validation during operation. Use Value: 70 ns access time meets timing budgets of 80C196-based controllers; JTAG ISP enables post-deployment updates without disassembly. | Use Scenario: Retrofitting aging 80C51XA-based operator panels with enhanced memory and logic capacity. IC Role / Device Role / Timing Role: Replaces multiple discrete memories and PALs-providing expanded address space via page register and custom decode logic in DPLD. Use Value: Reduces redesign effort: pin-compatible replacement for legacy memory+logic stacks while adding in-field programmability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable memory + logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD4255G2-70U | Same architecture but with 8 Mbit Primary Flash (16 × 32K x 16) and identical PLD/SRAM specs. | Suitable for larger firmware images; requires no PCB change if footprint and pinout match. | Select when firmware size exceeds 4 Mbit and LQFP80 mechanical compatibility is confirmed. |
| PSD813F2A-70U | Single-bank 4 Mbit Flash, no Secondary Flash, reduced PLD (2000 gates), same 64 Kbit SRAM and 70 ns timing. | Lacks concurrent operation and boot protection features; lower logic density limits complex decode tasks. | Choose only for cost-sensitive designs where dual-bank operation and advanced PLD are unnecessary. |
Compared with PSD4255G2-70U, the PSD4235G2-70U offers smaller Flash footprint and lower power during partial erase cycles; versus PSD813F2A-70U, it delivers critical dual-bank concurrency and enhanced PLD resources for robust system-level integration.
Availability
PSD4235G2-70U is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive ECUs, medical diagnostic equipment, and legacy HMI terminal retrofits requiring stable component supply and long-lifecycle support.
Supply support for PSD4235G2-70U 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 embedded markets.
The PSD (Programmable System Device) product line was designed to integrate Flash memory, SRAM, and configurable logic into a single chip for 16-bit MCU-based systems-reducing board complexity and enabling field-upgradable firmware architectures.
FAQ
What MCU families are natively supported by the PSD4235G2-70U?
The PSD4235G2-70U provides direct bus interface support for 80C196, 80C186, 80C51XA, MC683xx, MC68HC16, H8/300, MMC2001, and C16x families. Its flexible address/data/control signal mapping and programmable decode logic eliminate need for external bus translators in these architectures.
How does the dual-bank Flash architecture enable in-application programming (IAP)?
The dual-bank structure allows the MCU to execute code from the Primary Flash bank while simultaneously erasing or programming the Secondary Flash bank-or vice versa. This enables safe firmware updates without halting real-time operations, verified by Ready/Busy (PE4) signaling and status bit polling per datasheet Section 7.2.2.
Can the PLD resources be used for clock domain crossing or asynchronous signal synchronization?
Yes-the integrated CPLD supports user-defined logic functions including synchronizers for asynchronous inputs. Input macrocells (IMCs) provide registered inputs with configurable clocks, and output macrocells (OMCs) support registered outputs, enabling robust metastability mitigation for signals crossing between MCU and peripheral domains.
Is the PSD4235G2-70U RoHS-compliant and ECOPACK® certified?
Yes-PSD4235G2-70U is manufactured in an ECOPACK®-compliant LQFP80 package and meets RoHS Directive 2011/65/EU requirements. Full compliance documentation, including material declarations and lead-free process details, is available in STMicroelectronics' official PSD4235G2 datasheet revision history and packaging annexes.
PSD4235G2-70U 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:
- -
PSD4235G2-70U FAQ
1.How can I place an order for PSD4235G2-70U through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD4235G2-70U 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 PSD4235G2-70U reliable?
The price and inventory of PSD4235G2-70U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD4235G2-70U is usually 5 days.
3.What payment methods are accepted for PSD4235G2-70U?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD4235G2-70U transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD4235G2-70U?
PSD4235G2-70U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD4235G2-70U 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 PSD4235G2-70U?
For technical support, including PSD4235G2-70U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD4235G2-70U requirements.
6.How does Aetrix verify that PSD4235G2-70U is sourced from the original manufacturer or authorized distributors?
All PSD4235G2-70U 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 PSD4235G2-70U meets industry standards.
7.What is the process for return or replacement of PSD4235G2-70U?
All PSD4235G2-70U units undergo pre-shipment inspection (PSI). If there is an issue with PSD4235G2-70U, 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 PSD4235G2-70U part is unused and in its original packaging.
Return procedure for PSD4235G2-70U:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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