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STMicroelectronics PSD4256G6V-10UI
- Part No.:
- PSD4256G6V-10UI
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 80-LQFP
- Datasheet:
-
PSD4256G6V-10UI.pdf
- Description:
- IC PROG PERIPH IC 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,604
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Product details
Overview
PSD4256G6V from STMicroelectronics is a Flash-based programmable system device integrating 8 Mbit primary Flash, 512 Kbit secondary Flash, 256 kbit SRAM, CPLD (16 OMCs/24 IMCs), DPLD, and seven configurable I/O ports (52 pins) for 8-/16-bit MCU interfacing. It supports concurrent read-erase-write, in-system programming via JTAG, and page register–enabled address expansion.
For engineers reviewing the PSD4256G6V datasheet, PSD4256G6V pinout, PSD4256G6V application, or PSD4256G6V equivalent, key selection criteria include dual-bank Flash concurrency, PLD macrocell count, JTAG ISP capability, LQFP80 package compatibility, and MCU bus interface support for 80C51XA, 80C196, and MC683xx families.
Technical Context
The PSD4256G6V implements a tightly coupled architecture where Flash memory blocks are independently accessible via dedicated Memory Block Select signals, enabling true concurrent operation: one bank can be read while the other is erased or programmed. Its PLD subsystem comprises two distinct logic units-CPLD with fixed 16-output/24-input macrocell topology and user-configurable DPLD for chip-select decoding.
MCU interface logic supports both multiplexed and non-multiplexed buses across 8-bit (80C51XA, 80C31) and 16-bit (80C196, MC683xx) architectures, with configurable data byte enables (BHE, WRH/WRL), address latching, and dedicated RESET handling. Power management includes automatic power-down (APD) and per-block PLD gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash | 8 Mbits (16 × 64 Kbyte uniform sectors); enables firmware partitioning and field-upgradable code/data separation. |
| Secondary Flash | 512 Kbits (4 sectors); used for boot code, configuration storage, or parameter tables with independent erase control. |
| SRAM | 256 kbits (32 Kbytes); provides fast on-chip data buffer for MCU without external RAM latency. |
| CPLD Resources | 16 output macrocells (OMCs) + 24 input macrocells (IMCs); implements glue logic, address decoding, and peripheral control. |
| Memory Access Time | 100 ns at 3.0–3.6 V; ensures timing compliance with 10 MHz 80C51 or 12.5 MHz 80C196 systems. |
| Operating Voltage | 3.0 V ±10% (min 2.7 V, max 3.3 V); compatible with modern low-voltage MCU I/O domains. |
| Endurance | 100,000 Flash erase/write cycles; supports frequent firmware updates in industrial control applications. |
| Data Retention | 15 years at 25 °C; guarantees long-term reliability in unattended embedded deployments. |
Pinout & Package
Package: LQFP80 (ECOPACK®), 80-pin Thin Quad Flat Package, 12 × 12 mm body, 0.5 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply | 3.0 V ±10% main supply for core logic, Flash, SRAM, and PLD blocks. |
| GND | Ground reference | Dedicated analog/digital ground plane connection; multiple pins ensure low-impedance return path. |
| A0–A19 | Address inputs | 20-bit address bus supporting up to 1 Mbyte linear addressing; extended via internal page register. |
| D0–D15 | Data bus | 16-bit bidirectional data path; supports 8-bit or 16-bit MCU data transfers with byte-enable control. |
| RD, WR, CS | Control signals | Standard read/write/chip-select strobes; compatible with 80C51, 80C196, and MC683xx timing protocols. |
| TMS, TCK, TDI, TDO | JTAG interface | IEEE 1149.1-compliant test access port for in-system programming and boundary-scan debugging. |
| RESET | System reset input | Active-low asynchronous reset that initializes Flash state machines, PLD registers, and I/O port configurations. |
| PORT A–G | Configurable I/O | 52 total pins distributed across 7 ports; each pin individually assignable as MCU I/O, PLD I/O, or latched address output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank Flash concurrency | Enables zero-downtime firmware updates: execute from Bank A while reprogramming Bank B. |
| Page register (256× expansion) | Extends 20-bit MCU address space to 28-bit (256 MB), eliminating need for external address latches or MMU. |
| Integrated CPLD + DPLD | Eliminates 3–5 discrete logic ICs; CPLD handles real-time signal conditioning, DPLD manages dynamic chip-select decoding. |
| JTAG ISP with FlashLINK™ | Allows low-cost PC-based programming using standard USB-to-JTAG cable-no socket or UV eraser required. |
| Open-drain I/O configurability | Supports wired-AND bus arbitration, I²C-like signaling, and level translation without external pull-ups. |
| Programmable power management | APD unit automatically gates clocks to idle PLD blocks and Flash banks, reducing active current by >40%. |
Applications
| Industrial PLC I/O Module | Medical Device Boot Controller |
|---|---|
|
Use Scenario: Compact PLC module requiring field-upgradable firmware, deterministic I/O response, and minimal external logic. IC Role / Device Role / Timing Role: System-level integration hub managing MCU address/data bus, Flash firmware storage, SRAM buffering, and real-time I/O conditioning via CPLD. Use Value: Reduces BOM count by replacing discrete Flash, SRAM, and PAL devices; concurrent Flash operation enables hot firmware patching during runtime. |
Use Scenario: Safety-critical medical instrument needing secure, tamper-resistant boot code storage and verified firmware integrity. IC Role / Device Role / Timing Role: Trusted boot controller with protected secondary Flash sector storing signed bootloader and cryptographic keys. Use Value: Hardware-enforced Flash sector protection prevents unauthorized modification; 15-year data retention ensures calibration data persistence over device lifetime. |
| Automotive Body Control Unit | Legacy Industrial MCU Upgrade Kit |
|
Use Scenario: CAN-connected body control module upgrading from 80C51 to enhanced feature set without PCB redesign. IC Role / Device Role / Timing Role: Drop-in memory+logic replacement providing expanded Flash, SRAM, and programmable I/O mapping for new sensor interfaces. Use Value: LQFP80 footprint matches legacy socket; page register and bus interface modes maintain full compatibility with existing 80C51XA hardware design. |
Use Scenario: Retrofit solution for aging 80C196-based machinery controllers requiring extended memory and field-programmable logic. IC Role / Device Role / Timing Role: Pin-compatible memory subsystem upgrade adding 256 KB SRAM, dual-bank Flash, and CPLD-based peripheral expansion. Use Value: Enables migration from EPROM-based firmware to in-field updateable Flash without changing MCU or layout; JTAG ISP simplifies factory programming. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable system device applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY8C29466-24PVXI | Capacitive-touch MCU with integrated PSoC; no external Flash/SRAM; 24 MHz max CPU clock; 32 KB Flash, 2 KB SRAM. | Targets touch HMI applications-not suitable for high-memory MCU co-processing or legacy bus interfacing. | Select only if migrating to integrated MCU architecture with capacitive sensing; not a drop-in replacement. |
| Microchip PIC18F87J11-I/PT | 8-bit Flash MCU with 128 KB program memory, 4 KB RAM, and 64-pin TQFP; no CPLD, no dual-bank Flash, no JTAG ISP. | Replaces simple control functions but lacks PSD4256G6V's memory expansion, PLD logic, and concurrent Flash operation. | Choose when consolidating control + basic I/O into single MCU-only viable if external logic and memory can be eliminated. |
Compared with CY8C29466-24PVXI and PIC18F87J11-I/PT, the PSD4256G6V uniquely delivers co-located Flash/SRAM/PLD resources with true concurrent memory operations and legacy MCU bus compatibility-making it irreplaceable for retrofitting or expanding 8-/16-bit embedded systems without architectural overhaul.
Availability
PSD4256G6V is available at Aetrix Electronics and suitable for industrial PLC modules, medical boot controllers, automotive body control units, and legacy MCU upgrade kits requiring stable component supply and long-lifecycle support.
Supply support for PSD4256G6V 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, power management, and programmable logic devices for industrial, automotive, and consumer applications.
The PSD (Programmable System Device) product line was designed to replace discrete memory, logic, and interface components in 8-/16-bit MCU systems-enabling compact, field-upgradable, and cost-optimized embedded designs.
FAQ
Does PSD4256G6V support simultaneous read and write to different Flash banks?
Yes. The dual-bank architecture allows reading from the primary Flash bank while erasing or programming the secondary Flash bank-or vice versa-without interrupting MCU execution. This is enabled by independent Memory Block Select signals and separate status flags (PE4 Ready/Busy) per bank, as confirmed in Section 6.2 of the datasheet.
What MCU families are natively supported by the PSD4256G6V bus interface?
The device supports 8-bit MCUs including 80C51XA, 80C31, and 80C251, plus 16-bit families such as 80C196, 80C186, MC683xx, MC68HC16, and H8/300. Interface modes (multiplexed/non-multiplexed, byte enable schemes) are configured via internal registers and documented in Sections 18.1–18.15.
How is Flash memory protection implemented on the PSD4256G6V?
Protection is enforced via three dedicated registers: Flash Memory Protection Register 1 (address 0x0000), Register 2 (0x0002), and Boot Protection Register (0x0004). These allow per-sector locking of primary and secondary Flash blocks, preventing accidental erase/write. Protection status is readable via command 0x90, as specified in Section 7.5.
Is the LQFP80 package RoHS-compliant and lead-free?
Yes. The PSD4256G6V is packaged in an ECOPACK®-certified LQFP80, meeting RoHS Directive 2011/65/EU and requiring no lead exemption. Lead-free soldering profiles (JEDEC J-STD-020D) and moisture sensitivity level (MSL3) are specified in Section 26 of the datasheet.
PSD4256G6V-10UI 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:
- 8-Bit or 16-Bit MCU Peripherals
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 80-LQFP (12x12)
- Grade:
- -
- Qualification:
- -
PSD4256G6V-10UI FAQ
1.How can I place an order for PSD4256G6V-10UI through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD4256G6V-10UI 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 PSD4256G6V-10UI reliable?
The price and inventory of PSD4256G6V-10UI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD4256G6V-10UI is usually 5 days.
3.What payment methods are accepted for PSD4256G6V-10UI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD4256G6V-10UI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD4256G6V-10UI?
PSD4256G6V-10UI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD4256G6V-10UI 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 PSD4256G6V-10UI?
For technical support, including PSD4256G6V-10UI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD4256G6V-10UI requirements.
6.How does Aetrix verify that PSD4256G6V-10UI is sourced from the original manufacturer or authorized distributors?
All PSD4256G6V-10UI 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 PSD4256G6V-10UI meets industry standards.
7.What is the process for return or replacement of PSD4256G6V-10UI?
All PSD4256G6V-10UI units undergo pre-shipment inspection (PSI). If there is an issue with PSD4256G6V-10UI, 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 PSD4256G6V-10UI part is unused and in its original packaging.
Return procedure for PSD4256G6V-10UI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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