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STMicroelectronics PSD854F2-70J
- Part No.:
- PSD854F2-70J
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
PSD854F2-70J.pdf
- Description:
- IC PROG PERIPH IC 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,592
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Product details
Overview
PSD854F2-70J from STMicroelectronics is a Flash in-system programmable (ISP) peripheral IC for 8-bit microcontrollers, integrating dual-bank Flash (2 Mbit primary + 256 Kbit secondary), 256 Kbit SRAM, 27 reconfigurable I/O ports, JTAG-based ISP, and a CPLD/DPLD logic block with >3000 gates. It operates at 5 V and supports concurrent read/erase/write operations across memory banks - used in legacy industrial control systems requiring field-upgradable firmware and custom address decoding.
For engineers reviewing the PSD854F2-70J datasheet, PSD854F2-70J pinout, PSD854F2-70J application, or PSD854F2-70J equivalent, key selection criteria include dual-bank Flash concurrency, PLD-based chip select decoding, JTAG ISP capability, and compatibility with 80C51/80C251/68HC11 buses.
Technical Context
The PSD854F2-70J implements a tightly coupled architecture where its dual-bank Flash enables background erase/write while executing code from the other bank. Its integrated PLD includes both CPLD (16 OMCs, 24 IMCs) and DPLD blocks for user-defined internal chip select generation and glue logic replacement.
It interfaces via an 8-bit multiplexed or non-multiplexed bus, supports latched address output on 16 I/O pins, and features a dedicated page register that expands MCU address space by 256×. Power management includes automatic power-down (APD) and Turbo Bit mode for performance scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash Memory | 2 Mbit (8 × 32K x8 uniform sectors); enables large firmware storage with sector-level protection. |
| Secondary Flash Memory | 256 Kbit (4 uniform sectors); used for parameter storage or boot code independent of main firmware. |
| SRAM Capacity | 256 Kbit; provides fast data buffer space for MCU without external RAM. |
| I/O Ports | 27 reconfigurable pins; support MCU I/O, PLD I/O, latched address output, or special functions - 16 configurable as open-drain. |
| PLD Logic Density | >3000 gates; integrates CPLD (16 OMCs/24 IMCs) and DPLD for custom decode logic and glue replacement. |
| Programming Interface | JTAG serial port compliant with IEEE 1149.1; enables full-chip in-system programming using low-cost FlashLINK cable. |
| Page Register | Internal 8-bit register; extends 16-bit MCU address space to 24-bit (64 KB → 16 MB) via bank switching. |
Pinout & Package
PSD854F2-70J is housed in a 52-pin PLCC (Plastic Leaded Chip Carrier) package, RoHS-compliant and ECOPACK® certified. Pin assignments follow STMicroelectronics' PLCC52 layout per Appendix B of Doc ID 7833 Rev 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply | +5 V nominal supply for core logic and I/O; requires local decoupling per datasheet guidelines. |
| GND | Ground reference | Digital ground plane connection; separate analog ground not required (single-supply design). |
| A0–A15 | Address inputs | 16-bit address bus interface; supports both multiplexed and non-multiplexed 8-bit MCU buses. |
| D0–D7 | Data bus | 8-bit bidirectional data path; compatible with 80C51, 80C251, and 68HC11 timing protocols. |
| RD, WR, CS | Control signals | Standard read/write/chip select inputs; enable direct connection to MCU bus without glue logic. |
| TCK, TMS, TDI, TDO | JTAG interface | IEEE 1149.1-compliant test access port; enables boundary-scan and full ISP functionality. |
| PC0–PC7 | Port C I/O | Configurable I/O bank; JTAG signals mapped to PC0–PC3 per Table 5; supports PLD I/O or address latch modes. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank concurrent Flash operation | Read from one bank while erasing/writing the other - eliminates firmware update downtime in embedded systems. |
| Integrated CPLD + DPLD logic | Replaces discrete glue logic; DPLD handles chip select decoding, CPLD implements state machines or I/O conditioning. |
| 27-pin reconfigurable I/O architecture | Each pin supports multiple roles (MCU I/O, PLD I/O, latched address, special function); reduces board footprint and routing complexity. |
| JTAG-based in-system programming | Enables field firmware updates and manufacturing programming without socketing or UV erasers - lowers production cost. |
| Page register address expansion | Extends 16-bit MCU addressing to 24-bit space (64 KB → 16 MB), enabling large memory-mapped peripherals or multi-application partitioning. |
Applications
| Industrial PLC Firmware Hub | Legacy 8051-Based HMI Controller |
|---|---|
|
Use Scenario: Field-deployed programmable logic controller requiring over-the-air firmware updates and custom I/O mapping. IC Role / Device Role / Timing Role: Acts as unified memory + logic hub: hosts firmware in primary Flash, stores configuration in secondary Flash, and implements custom I/O decoding via CPLD. Use Value: Eliminates need for external EPROM, address decoders, and SRAM - reduces BOM count and improves update reliability via JTAG ISP. |
Use Scenario: Human-machine interface panel built around 80C51XA MCU with limited address space and no external logic. IC Role / Device Role / Timing Role: Serves as memory expansion and glue logic replacement: provides 256 Kbit SRAM, 2 Mbit Flash, and DPLD-based chip select generation for LCD and keypad controllers. Use Value: Enables full 16 MB address space via page register and removes discrete 74-series logic chips - simplifies PCB layout and improves thermal margin. |
| Automotive Body Control Module (BCM) | Medical Instrument Bootloader Platform |
|
Use Scenario: Low-volume automotive BCM requiring secure, field-programmable firmware and robust power management. IC Role / Device Role / Timing Role: Functions as secure boot memory and logic manager: uses Flash sector protection bits and APD power-down mode during sleep cycles. Use Value: Prevents unauthorized firmware modification via hardware-level sector lock bits and reduces standby current to <100 µA. |
Use Scenario: Diagnostic medical device needing validated, tamper-resistant bootloader with fail-safe update capability. IC Role / Device Role / Timing Role: Hosts dual-image bootloader in primary/secondary Flash banks; validates new firmware before swapping banks via concurrent operation. Use Value: Guarantees atomic firmware updates - if power fails mid-update, prior image remains intact and executable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash+PLD peripheral applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD853F2-70J | Same PLCC52 package and architecture, but primary Flash reduced to 1 Mbit (4 × 32K sectors); no Turbo Bit feature. | Suitable for smaller firmware footprints; lacks concurrent operation optimization for large updates. | Select when firmware size ≤512 KB and cost sensitivity outweighs need for background programming. |
| PSD834F2-70J | Lower Flash density (512 Kbit primary + 128 Kbit secondary), same PLD and I/O count; supports only 80C31/68HC11 buses (no 80C251/80C51XA). | Targeted at simpler 8-bit systems with minimal memory and logic requirements. | Choose for legacy 80C31 designs where PLD usage is limited to basic decode and SRAM is optional. |
Compared with PSD853F2-70J and PSD834F2-70J, the PSD854F2-70J delivers highest Flash capacity and full bus compatibility - critical for complex 80C51XA-based systems requiring concurrent firmware updates and extensive PLD-based peripheral interfacing.
Availability
PSD854F2-70J is available at Aetrix Electronics and suitable for industrial control systems, legacy 8051-based instrumentation, and automotive body electronics requiring stable component supply and long-term obsolescence mitigation.
Supply support for PSD854F2-70J 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 headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog, and memory solutions for industrial, automotive, and consumer markets.
The PSD8XXFX product line was designed specifically to replace discrete memory and glue logic in 8-bit MCU systems - integrating Flash, SRAM, PLD, and ISP into a single programmable peripheral for cost-sensitive, space-constrained embedded designs.
FAQ
Is PSD854F2-70J still in production?
No - PSD854F2-70J is marked as Obsolete Product(s) per STMicroelectronics' official documentation (Doc ID 7833 Rev 7). However, Aetrix Electronics maintains verified, traceable inventory sourced from authorized channels and offers extended lifecycle support including cross-reference guidance and last-time-buy planning.
What MCU families does PSD854F2-70J directly support?
PSD854F2-70J natively supports 80C31, 80C251, 80C51XA, and 68HC11 MCUs via documented bus interface modes (multiplexed/non-multiplexed), control signal mapping, and timing compliance per Sections 15.1–15.8 of the datasheet.
Can the PLD logic be reprogrammed in-system?
Yes - the CPLD and DPLD blocks are fully reconfigurable via JTAG. Configuration data resides in Flash and is loaded automatically at power-up; changes require ISP programming through the JTAG interface using ST's FlashLINK tools and PSDSoft software.
Does PSD854F2-70J support 3 V operation?
No - PSD854F2-70J is a 5 V-only device (VCC = 4.5–5.5 V), specified in Table 40 of Doc ID 7833 Rev 7. The 3 V variants (e.g., PSD854F2-70JC) are distinct part numbers with different DC/AC characteristics and are not pin-compatible.
PSD854F2-70J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Programmable Peripherals IC
- Applications:
- 8-Bit MCU Peripherals
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.1x19.1)
- Grade:
- -
- Qualification:
- -
PSD854F2-70J FAQ
1.How can I place an order for PSD854F2-70J through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD854F2-70J 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 PSD854F2-70J reliable?
The price and inventory of PSD854F2-70J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD854F2-70J is usually 5 days.
3.What payment methods are accepted for PSD854F2-70J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD854F2-70J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD854F2-70J?
PSD854F2-70J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD854F2-70J 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 PSD854F2-70J?
For technical support, including PSD854F2-70J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD854F2-70J requirements.
6.How does Aetrix verify that PSD854F2-70J is sourced from the original manufacturer or authorized distributors?
All PSD854F2-70J 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 PSD854F2-70J meets industry standards.
7.What is the process for return or replacement of PSD854F2-70J?
All PSD854F2-70J units undergo pre-shipment inspection (PSI). If there is an issue with PSD854F2-70J, 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 PSD854F2-70J part is unused and in its original packaging.
Return procedure for PSD854F2-70J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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