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STMicroelectronics PSD834F2V-15J
- Part No.:
- PSD834F2V-15J
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
PSD834F2V-15J.pdf
- Description:
- IC PROG PERIPH IC 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,284
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Product details
Overview
PSD834F2V-15J from STMicroelectronics is a Flash Programmable System Device (PSD) for 8-bit microcontrollers, integrating 2 Mbit primary Flash, 256 Kbit secondary Flash, 64 Kbit battery-backed SRAM, a 16-output CPLD, a 73-input DPLD, and 27 reconfigurable I/O ports in a single PLCC52 package. It supports in-system programming via JTAG, executes code from secondary Flash during primary Flash updates, and delivers 100,000 erase/write cycles for Flash memory.
For engineers reviewing the PSD834F2V-15J datasheet, PSD834F2V-15J pinout, PSD834F2V-15J application, or PSD834F2V-15J equivalent, this device serves as a unified peripheral replacement for discrete Flash, SRAM, address decoders, and glue logic in legacy 8-bit MCU systems - especially where field-upgradable firmware, low-power standby (<25 µA), and concurrent execute-and-program capability are required.
Technical Context
The PSD834F2V implements a dual-bank Flash architecture with independent sector-select logic: primary Flash (8 × 256 KB sectors) and secondary Flash (4 × 64 KB sectors), enabling true in-application programming (IAP) without halting execution. Its DPLD handles memory block decoding using combinatorial outputs, while the CPLD provides 16 OMCs and 24 IMCs for custom state machines or control logic.
It interfaces natively with multiplexed or non-multiplexed 8-bit MCU buses (e.g., 8051, 68HC11, Z80) using automatic bus control signal detection; the Page Register extends MCU address space by 256×, and the Power Management Unit includes Automatic Power-down (APD) mode triggered by MCU inactivity, reducing standby current to 25 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash Memory | 2 Mbit (256K × 8), organized in 8 uniform sectors - enables selective erase and firmware partitioning. |
| Secondary Flash Memory | 256 Kbit (32K × 8), 4 uniform sectors - supports concurrent code execution and primary Flash update. |
| SRAM | 64 Kbit battery-backed - retains data during main power loss when VSTBY (PC2) is connected to backup source. |
| CPLD Resources | 16 Output Macrocells (OMCs), 24 Input Macrocells (IMCs) - implements custom logic without external glue ICs. |
| DPLD Resources | 73 inputs, 17 outputs, 42 product terms - performs deterministic address decoding for memory and register selection. |
| JTAG Interface | Fully compliant serial port on Port C (PC0–PC6) - enables full-chip ISP without MCU involvement or external programmer. |
| Power Management | Standby current ≤25 µA; APD mode auto-enters sleep on MCU inactivity - reduces system-level power in idle states. |
| Endurance | Flash: ≥100,000 erase/write cycles; PLD configuration: ≥1,000 cycles - ensures long-term field reliability for firmware updates. |
Pinout & Package
PSD834F2V-15J is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC52) package with J-suffix marking, featuring gull-wing leads and a 0.050" lead pitch. The package supports through-hole mounting and provides thermal and mechanical stability for industrial embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA0–PA7 | Port A I/O pins | Configurable as MCU I/O, PLD I/O, or latched address outputs - supports multiplexed bus interfacing. |
| PB0–PB7 | Port B I/O pins | Same functionality as Port A; can be combined with Port A as 16-bit data port for non-multiplexed buses. |
| PC0–PC7 | Port C I/O pins | Includes JTAG signals (PC0=TMS, PC1=TCK, PC3=TSTAT, PC4=TERR, PC5=TDI, PC6=TDO); TDI/TDO enable serial ISP. |
| PD0–PD2 | Port D I/O pins | PD2 = Chip Select Input (CSI); PD1 = CLKIN (external clock input); PD0 = unused/reserved in this variant. |
| VCC, VSS | Power supply pins | 3.3 V ±10% single supply; VSS = ground reference - eliminates need for dual-voltage rails. |
| VSTBY (PC2) | Battery standby voltage input | Connects external battery to retain SRAM contents during main power failure - enables nonvolatile scratchpad operation. |
Key Features
| Feature | Design Value |
|---|---|
| In-System Programming (ISP) | Full-device programming via JTAG on Port C - eliminates boot EPROM and external programmers; supports field firmware updates. |
| Concurrent Execute-and-Program | Run code from secondary Flash while erasing/writing primary Flash - removes IAP software overhead and hardware complexity. |
| Page Register (8-bit) | Expands MCU address space by factor of 256 - enables access to >64 KB memory banks without external address latches. |
| Programmable Power Management Unit (PMU) | Automatic Power-down (APD) mode triggered by MCU bus inactivity - reduces standby current to 25 µA without firmware intervention. |
| Integrated DPLD + CPLD | DPLD decodes memory blocks; CPLD implements custom logic (e.g., state machines, counters) - replaces discrete PALs and address decoders. |
Applications
| Industrial Control Panel | Legacy Medical Instrument |
|---|---|
|
Use Scenario: Microcontroller-based HMI with firmware-upgradable display logic, sensor calibration tables, and real-time logging. IC Role / Device Role / Timing Role: Unified memory + logic controller replacing separate Flash, SRAM, and address decoder ICs; manages bank-switched code execution. Use Value: Enables over-the-air firmware patches via JTAG without disassembly; battery-backed SRAM preserves calibration data across power cycles. |
Use Scenario: Portable ECG monitor using 8051 MCU requiring secure, field-updatable waveform processing algorithms and patient history storage. IC Role / Device Role / Timing Role: Dual-Flash architecture executes signal analysis from secondary Flash while updating primary Flash with new algorithms. Use Value: Eliminates need for external boot ROM and reduces BOM count by 4+ components; 100k-cycle Flash endurance supports 10+ years of clinical updates. |
| Automotive Body Controller | Point-of-Sale Terminal |
|
Use Scenario: Low-power door module with wake-on-LIN, EEPROM emulation, and configurable I/O for switch sensing and LED drivers. IC Role / Device Role / Timing Role: CPLD implements LIN protocol state machine and GPIO debouncing logic; SRAM stores runtime configuration. Use Value: Reduces component count and PCB area vs. discrete logic + Flash + SRAM; APD mode cuts quiescent current to <25 µA for battery longevity. |
Use Scenario: Embedded cash register with 80C251 MCU needing localized firmware storage, receipt buffer memory, and keypad scan logic. IC Role / Device Role / Timing Role: DPLD decodes peripheral addresses; Page Register maps receipt log across multiple Flash pages. Use Value: Simplifies design migration from older 64 KB memory-limited platforms; open-drain I/O on 16 pins directly drives LED indicators and matrix keypads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable system device applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD813F2V-15J | 1 Mbit primary Flash, no secondary Flash, same CPLD/DPLD resources - lacks concurrent execute-and-program capability. | Suitable only for static firmware deployments without field updates; cannot support IAP workflows. | Select only if firmware size ≤1 Mbit and field upgradeability is not required. |
| PSD835F2V-15J | 2 Mbit primary Flash + 512 Kbit secondary Flash + 128 Kbit SRAM - adds 256 KB more nonvolatile storage and double SRAM capacity. | Supports larger firmware images and extended data logging; higher pin count (PQFP64) requires PCB redesign. | Choose when secondary Flash capacity or SRAM headroom exceeds PSD834F2V-15J's 256 KB/64 KB limits. |
Compared with PSD813F2V-15J, the PSD834F2V-15J adds critical IAP capability via secondary Flash; compared with PSD835F2V-15J, it trades SRAM and secondary Flash capacity for PLCC52 footprint compatibility and lower cost - making it optimal for space-constrained, upgradeable 8-bit designs.
Availability
PSD834F2V-15J is available at Aetrix Electronics and suitable for industrial control panels, legacy medical instruments, automotive body controllers, and point-of-sale terminals requiring stable component supply, long-life obsolescence management, and field-programmable firmware.
Supply support for PSD834F2V-15J 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, analog ICs, power management, and embedded flash solutions for industrial, automotive, and consumer markets.
The PSD (Programmable System Device) family was designed to consolidate discrete memory, logic, and interface functions into a single chip for 8-bit MCU systems - reducing BOM cost, board space, and design complexity in legacy embedded applications.
FAQ
What MCU families does PSD834F2V-15J support natively?
The PSD834F2V-15J supports Intel 8031/8051 variants, Motorola 68HC11/HC12/HC16, Philips 8031/8051XA, and Zilog Z80/Z8 MCUs. Its bus interface detects standard control signals (RD, WR, ALE, etc.) automatically, eliminating need for custom glue logic or timing adjustments across these architectures.
How does the dual-Flash architecture enable true in-application programming (IAP)?
IAP is enabled because the secondary Flash (256 Kbit) operates as an independent code-execution bank: the MCU runs firmware from secondary Flash while simultaneously erasing or programming the primary Flash (2 Mbit). This avoids bus contention, eliminates software workarounds like shadow RAM, and requires no external memory arbitration.
Can the CPLD and DPLD be programmed independently of the Flash memory?
Yes - the CPLD and DPLD configuration bits are stored separately from Flash memory and can be programmed via JTAG (TMS/TCK/TDI/TDO on Port C) or in-circuit by the host MCU using the internal loader. Their configuration persists across Flash erase cycles and power cycles, and they support ≥1,000 reprogramming cycles.
What is the role of the VSTBY (PC2) pin, and how is it implemented?
VSTBY (PC2) is a dedicated input for connecting an external backup battery (typically 3 V lithium) to maintain SRAM data during main power loss. When VCC drops below operating threshold, internal circuitry switches SRAM power source to VSTBY, preserving all 64 Kbit contents for up to 15 years per data retention spec - no external supervisor IC required.
PSD834F2V-15J 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:
- -
PSD834F2V-15J FAQ
1.How can I place an order for PSD834F2V-15J through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD834F2V-15J 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 PSD834F2V-15J reliable?
The price and inventory of PSD834F2V-15J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD834F2V-15J is usually 5 days.
3.What payment methods are accepted for PSD834F2V-15J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD834F2V-15J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD834F2V-15J?
PSD834F2V-15J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD834F2V-15J 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 PSD834F2V-15J?
For technical support, including PSD834F2V-15J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD834F2V-15J requirements.
6.How does Aetrix verify that PSD834F2V-15J is sourced from the original manufacturer or authorized distributors?
All PSD834F2V-15J 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 PSD834F2V-15J meets industry standards.
7.What is the process for return or replacement of PSD834F2V-15J?
All PSD834F2V-15J units undergo pre-shipment inspection (PSI). If there is an issue with PSD834F2V-15J, 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 PSD834F2V-15J part is unused and in its original packaging.
Return procedure for PSD834F2V-15J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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