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STMicroelectronics PSD834F2-90J
- Part No.:
- PSD834F2-90J
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
PSD834F2-90J.pdf
- Description:
- IC PROG PERIPH IC 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,399
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Product details
Overview
PSD834F2-90J from STMicroelectronics is a Flash in-system programmable (ISP) peripheral IC for 8-bit microcontrollers, integrating dual-bank Flash (1 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 serves as a memory and logic expansion companion for legacy 80C51, 80C251, and 68HC11 MCUs in industrial control and embedded instrumentation.
For engineers reviewing the PSD834F2-90J datasheet, PSD834F2-90J pinout, PSD834F2-90J application, or PSD834F2-90J equivalent, key selection criteria include concurrent Flash read/erase capability, PLD-based chip select decoding, page register address extension, JTAG ISP support, and 5 V operation with open-drain I/O configuration.
Technical Context
The PSD834F2-90J implements a tightly coupled architecture where MCU bus signals directly drive Flash/SRAM banks and PLD logic blocks. Its dual-bank Flash enables background erase/write while executing code from the other bank, supported by hardware-ready signaling (PC3) and data polling (DQ7)/toggle (DQ6) status flags.
The integrated PLD comprises two independent units: a 16-output CPLD for configurable logic and timing, and a user-defined DPLD for internal chip select decoding - both programmable via JTAG and controlled by dedicated OMC/IMC registers mapped into the MCU's I/O space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash | 1 Mbit (8 × 32K x8 sectors); enables firmware partitioning and field-upgradable code storage. |
| Secondary Flash | 256 Kbit (4 × 64K x8 sectors); used for parameter storage, boot loader, or configuration data. |
| SRAM | 256 Kbit; provides fast, non-volatile-accessible data buffer for MCU without external RAM. |
| I/O Ports | 27 pins; individually configurable as MCU I/O, PLD I/O, latched address outputs, or special function pins. |
| PLD Capacity | >3000 gates; supports custom decode logic, glueless interface to peripherals, and state-machine acceleration. |
| Page Register | 8-bit internal register; expands MCU address space by factor of 256 for extended memory mapping. |
| JTAG ISP | IEEE 1149.1-compliant serial port; enables full-chip programming and debugging without socket removal. |
Pinout & Package
PSD834F2-90J is housed in a 52-pin PLCC (Plastic Leaded Chip Carrier) package, RoHS-compliant and ECOPACK® certified. Pin assignments follow STMicroelectronics' PLCC52 standard layout per Appendix B of Doc ID 7833 Rev 7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply | +5 V nominal supply; powers all internal logic, Flash, SRAM, and I/O drivers. |
| GND | Ground reference | Common return path for digital and analog sections; decoupling required at device corner. |
| A0–A15 | Address inputs | 16-bit multiplexed/non-multiplexed address bus interface compatible with 80C51/80C251/68HC11. |
| D0–D7 | Data bus | 8-bit bidirectional data path; supports byte-wide read/write to Flash, SRAM, and registers. |
| RD, WR, CS | Control signals | Standard MCU read/write/chip-select strobes; decoded internally to access memory and PLD blocks. |
| PC0–PC7 | JTAG & I/O port C | Port C pins double as TCK/TMS/TDI/TDO; configurable for boundary-scan or general-purpose I/O. |
| PD0–PD7 | I/O port D | 8-bit port supporting open-drain mode; used for PLD output enable, reset control, or peripheral handshake. |
Key Features
| Feature | Design Value |
|---|---|
| Concurrent Flash operation | Read from one bank while erasing/writing the other - eliminates system stall during firmware updates. |
| Reconfigurable PLD logic | CPLD + DPLD blocks replace discrete glue logic; reduce BOM count and PCB area in 8-bit systems. |
| Page register addressing | Extends 16-bit MCU address space to 24-bit range (64 KB → 16 MB), enabling large memory footprint. |
| JTAG in-system programming | Eliminates need for UV erasers or parallel programmers; supports production-line flash programming via low-cost FlashLINK cable. |
| Programmable power management | Automatic Power-down (APD) unit reduces standby current to <100 µA; extends battery life in portable instruments. |
Applications
| Industrial PLC I/O Expansion | Legacy MCU-Based Test Equipment |
|---|---|
Use Scenario: Adding isolated digital I/O, analog monitoring, and local firmware update capability to an aging 80C51-based PLC controller. IC Role / Device Role / Timing Role: Acts as unified memory + logic hub - hosts boot code in primary Flash, stores calibration tables in secondary Flash, and implements sensor interface timing via CPLD. Use Value: Eliminates external EPROM, latch, and decoder ICs; reduces board complexity while enabling field firmware upgrades via JTAG. |
Use Scenario: Upgrading a 68HC11-based benchtop multimeter to support new measurement algorithms and calibration storage. IC Role / Device Role / Timing Role: Provides expanded program memory and SRAM buffer; DPLD handles ADC trigger synchronization and display refresh timing. Use Value: Enables feature-rich firmware without changing MCU - leverages existing toolchain and preserves hardware investment. |
| Medical Instrumentation Control | Automotive Diagnostic Tool |
Use Scenario: Supporting real-time waveform capture and analysis in a portable ECG monitor using an 80C251 core. IC Role / Device Role / Timing Role: Manages high-speed data buffering in SRAM, executes signal processing routines from Flash, and generates precise sampling clocks via PLD. Use Value: Achieves deterministic latency for analog front-end control - no external FIFO or clock generator required. |
Use Scenario: Enabling CAN protocol stack updates and vehicle-specific diagnostic routines in a handheld OBD-II scanner. IC Role / Device Role / Timing Role: Stores multiple firmware variants in Flash banks; CPLD routes CAN TX/RX lines and manages LED/status indicators. Use Value: Allows single-hardware platform to support diverse vehicle models - firmware selection handled via page register and sector protection bits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash+PLD peripheral applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD833F2-90J | 512 Kbit primary Flash (4 × 32K x8), same secondary Flash and PLD resources. | Limited code storage capacity; suitable for simpler firmware or space-constrained designs. | Select when application firmware fits within 512 KB and cost sensitivity outweighs future upgrade headroom. |
| PSD854F2-90U | TQFP64 package, 2 Mbit primary Flash, identical PLD and I/O architecture. | Higher density and better thermal performance; requires PCB redesign due to different pinout and package. | Choose for new designs needing maximum Flash capacity and surface-mount compatibility - not drop-in compatible. |
Compared with PSD834F2-90J, PSD833F2-90J trades primary Flash capacity for lower cost in fixed-function systems, while PSD854F2-90U offers scalable memory headroom at the expense of mechanical redesign - both retain identical PLD functionality and JTAG ISP workflow.
Availability
PSD834F2-90J is available at Aetrix Electronics and suitable for industrial PLCs, legacy MCU-based test equipment, and medical instrumentation requiring stable component supply and long-term obsolescence mitigation.
Supply support for PSD834F2-90J 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, designing and manufacturing analog, MCU, power, and memory solutions for industrial, automotive, and consumer markets.
The PSD8XXFX product line was developed specifically to extend the life and capability of 8-bit microcontroller platforms by integrating Flash memory, SRAM, and programmable logic in a single, JTAG-programmable device.
FAQ
Is PSD834F2-90J still in production?
No - PSD834F2-90J is marked as Obsolete Product(s) per STMicroelectronics' official documentation (Doc ID 7833 Rev 7). However, Aetrix Electronics maintains verified legacy inventory with full traceability and extended lifecycle support for ongoing production and repair programs.
What MCU families does PSD834F2-90J support natively?
PSD834F2-90J provides direct bus interface support for 80C51XA, 80C251, 80C31, and 68HC11 MCUs, including dedicated timing diagrams and control signal mappings documented in Sections 15.5–15.8 of the datasheet.
Can the PLD logic be reprogrammed in the field?
Yes - both CPLD and DPLD logic configurations are stored in the secondary Flash memory and can be updated in-system via JTAG using ST's FlashLINK software and compatible boundary-scan cables, without removing the device from the PCB.
Does PSD834F2-90J support 3 V operation?
No - PSD834F2-90J is a 5 V-only device (VCC = 4.5 V to 5.5 V), specified in Table 40 of Doc ID 7833 Rev 7. It is not compatible with 3 V logic families or mixed-voltage interfaces without level translation.
PSD834F2-90J 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:
- -
PSD834F2-90J FAQ
1.How can I place an order for PSD834F2-90J through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD834F2-90J 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 PSD834F2-90J reliable?
The price and inventory of PSD834F2-90J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD834F2-90J is usually 5 days.
3.What payment methods are accepted for PSD834F2-90J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD834F2-90J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD834F2-90J?
PSD834F2-90J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD834F2-90J 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 PSD834F2-90J?
For technical support, including PSD834F2-90J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD834F2-90J requirements.
6.How does Aetrix verify that PSD834F2-90J is sourced from the original manufacturer or authorized distributors?
All PSD834F2-90J 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 PSD834F2-90J meets industry standards.
7.What is the process for return or replacement of PSD834F2-90J?
All PSD834F2-90J units undergo pre-shipment inspection (PSI). If there is an issue with PSD834F2-90J, 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 PSD834F2-90J part is unused and in its original packaging.
Return procedure for PSD834F2-90J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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