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STMicroelectronics PSD834F2-70M
- Part No.:
- PSD834F2-70M
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 52-QFP
- Datasheet:
-
PSD834F2-70M.pdf
- Description:
- IC PROG PERIPH IC 52PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,598
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Product details
Overview
PSD834F2-70M from STMicroelectronics is a Flash in-system programmable (ISP) peripheral for 8-bit microcontrollers, integrating dual-bank Flash (1 Mbit primary + 256 Kbit secondary), 256 Kbit SRAM, 27 reconfigurable I/O ports, and a 3000-gate PLD with CPLD/DPLD architecture. It supports concurrent read-erase-write operations and operates at 5 V with 70 ns access time, targeting legacy 80C51/80C251/68HC11-based embedded control systems.
For engineers reviewing the PSD834F2-70M datasheet, PSD834F2-70M pinout, PSD834F2-70M application, or PSD834F2-70M equivalent, key selection criteria include ISP JTAG support, dual-bank Flash concurrency, page register–enabled address expansion, PLD-based chip select decoding, and compatibility with multiplexed/non-multiplexed 8-bit MCU buses.
Technical Context
The PSD834F2-70M implements a tightly coupled memory-peripheral architecture where the primary Flash (8 × 32K × 8) and secondary Flash (4 × 64K × 8) operate independently under JTAG-controlled ISP, enabling background erase/write while executing code from the other bank. Its PLD subsystem comprises 16 output macrocells (OMCs) and 24 input macrocells (IMCs), configurable as CPLD or DPLD for custom logic and address decoding.
The device features a dedicated page register that extends the MCU's 16-bit address space by 8-bit page selection (256 pages), allowing seamless access to up to 16 MB of combined memory. Power management includes automatic power-down (APD) triggered by idle bus cycles and per-block PLD clock gating, reducing active current to 45 mA typical at 5 V and 70 ns timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash | 1 Mbit (8 uniform 32K × 8 sectors); enables firmware partitioning and field-upgradable code banks. |
| Secondary Flash | 256 Kbit (4 uniform 64K × 8 sectors); used for configuration data, boot loaders, or parameter storage. |
| SRAM | 256 Kbit; provides fast, non-volatile-accessible working memory for MCU data and stack operations. |
| PLD Capacity | 3000 gates; supports user-defined logic including chip select decoding, glue logic, and interrupt arbitration. |
| Access Time | 70 ns; ensures timing compliance with 80C51/80C251/68HC11 buses running at ≤14 MHz. |
| JTAG Interface | IEEE 1149.1-compliant serial port; enables full-chip in-system programming without socket removal. |
| I/O Ports | 27 pins; individually configurable as MCU I/O, PLD I/O, latched address outputs, or open-drain (16 pins). |
Pinout & Package
PSD834F2-70M is packaged in a 52-pin PQFP (ECOPACK® compliant, package code M). Pin assignments follow STMicroelectronics' standard PLCC52/PQFP52 mapping with dedicated JTAG (TCK/TMS/TDI/TDO), MCU bus interface (AD0–AD7, A8–A15, RD, WR, CS), PLD I/O (P0–P26), and power/ground pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AD0–AD7 | Multiplexed Address/Data Bus | Bi-directional 8-bit bus shared between address (A0–A7) and data; requires external latch for demultiplexing. |
| A8–A15 | Upper Address Bus | Dedicated 8-bit non-multiplexed address lines for 16-bit addressing (64 KB space). |
| RD, WR | MCU Control Signals | Active-low read/write strobes synchronized to MCU bus cycle; drive PSD internal memory access timing. |
| TCK, TMS, TDI, TDO | JTAG Test Access Port | Standard IEEE 1149.1 signals enabling boundary-scan testing and full-chip ISP via FlashLINK cable. |
| P0–P26 | Reconfigurable I/O Ports | 27 pins supporting MCU I/O, PLD I/O, latched address output (e.g., A8–A15 mirroring), or open-drain mode. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank Flash concurrency | Read from one Flash bank while erasing/writing the other-enables zero-downtime firmware updates. |
| Page register address expansion | 8-bit page register multiplies effective address space by 256 (e.g., 64 KB → 16 MB), eliminating external page logic. |
| Configurable PLD architecture | 16 OMCs + 24 IMCs support both CPLD (registered logic) and DPLD (combinatorial decode) modes for custom chip selects. |
| Open-drain I/O capability | 16 of 27 I/Os configurable as open-drain-supports wired-AND interrupt sharing and level translation to 3.3 V peripherals. |
| Programmable power management | Automatic power-down (APD) unit reduces standby current to 10 µA; PLD clock gating cuts dynamic power during idle periods. |
Applications
| Industrial PLC I/O Expansion | Legacy 8051-Based Medical Device Controller |
|---|---|
|
Use Scenario: Adding isolated digital I/O, analog monitoring, and EEPROM-backed calibration storage to an aging 80C51-based PLC mainboard. IC Role / Device Role / Timing Role: PSD834F2-70M serves as unified memory + logic + I/O hub-replacing discrete EPROM, SRAM, PAL, and address decoders. Use Value: Reduces BOM count by 7 components; enables field firmware updates via JTAG without board rework. |
Use Scenario: Upgrading a Class II medical infusion pump controller to support dual-boot firmware and runtime parameter logging. IC Role / Device Role / Timing Role: Acts as non-volatile program/data store and real-time PLD-based safety interlock logic (e.g., motor enable/disable sequencing). Use Value: Dual-bank Flash allows validated backup firmware; PLD ensures deterministic response (<100 ns) to critical hardware faults. |
| Automotive Body Control Module (BCM) | Test Equipment Firmware Loader |
|
Use Scenario: Consolidating flash memory, RAM, and CAN/LIN interface glue logic in a low-cost 80C251-based BCM for door module control. IC Role / Device Role / Timing Role: Provides 1 Mbit boot code storage, 256 Kbit runtime variable buffer, and PLD-decoded peripheral chip selects for LIN transceivers and LED drivers. Use Value: Eliminates need for external address latches and CPLDs; 5 V tolerance matches automotive MCU supply rails. |
Use Scenario: Enabling rapid firmware loading and verification on production test fixtures for 8-bit MCU-based consumer electronics. IC Role / Device Role / Timing Role: Functions as programmable memory fixture-accepting JTAG-programmed Flash images and validating checksums via SRAM shadow copy. Use Value: Cuts test station setup time by 65%; JTAG ISP eliminates manual EPROM burner handling and socket wear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash+PLD+SRAM peripheral applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD833F2-70M | Same package and pinout; primary Flash reduced to 512 Kbit (4 × 32K × 8 sectors); identical PLD, SRAM, and JTAG. | Suitable for smaller firmware footprints; lacks sector granularity for large OTA updates. | Select when firmware size < 512 KB and cost sensitivity outweighs upgrade flexibility. |
| PSD854F2-70M | Same architecture but in TQFP64 package; adds 2 additional I/O pins (29 total) and supports 2 Mbit primary Flash (8 × 64K × 8). | Required for designs needing >1 Mbit code space or extra PLD I/O for complex peripheral decoding. | Choose for future-proofing or when migrating from PSD834F2 to higher-density layout without redesigning logic. |
Compared with PSD833F2-70M, PSD834F2-70M offers double primary Flash capacity for robust dual-bank firmware schemes; versus PSD854F2-70M, it trades 2 I/Os and 1 Mbit Flash for PQFP52 footprint compatibility and lower PCB layer count.
Availability
PSD834F2-70M is available at Aetrix Electronics and suitable for industrial PLC upgrades, legacy medical device refurbishment, and automotive body control module redesigns requiring stable component supply and long-term obsolescence mitigation.
Supply support for PSD834F2-70M 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, and embedded peripherals for industrial, automotive, and consumer markets.
The PSD8XXFX family was designed specifically to replace discrete memory, logic, and interface components in 8-bit MCU systems-delivering integrated Flash, SRAM, PLD, and JTAG ISP in a single programmable peripheral.
FAQ
Is PSD834F2-70M still in production?
No-PSD834F2-70M is marked as Obsolete by STMicroelectronics (Doc ID 7833 Rev 7, Table 1). However, Aetrix Electronics maintains verified legacy inventory with full traceability, extended warranty, and engineering support for ongoing production and repair programs.
What JTAG tools are compatible with PSD834F2-70M?
The device is fully compatible with ST's FlashLINK JTAG cable and associated PSDSoft development software. Third-party IEEE 1149.1-compliant programmers (e.g., Xilinx Platform Cable USB, Segger J-Link with custom SVF scripts) can also perform ISP if configured for 5 V I/O and correct TAP controller initialization.
Can the PLD be reprogrammed independently of Flash memory?
Yes-the PLD configuration is stored in dedicated non-volatile registers and can be updated separately via JTAG using PSDSoft's "PLD Programming" mode, without erasing Flash contents or resetting the device. This enables logic changes in the field without affecting firmware.
Does PSD834F2-70M support 3.3 V operation?
No-it is a 5 V-only device (operating condition: VCC = 4.5–5.5 V per Table 40). Input thresholds are TTL-compatible, but it cannot be powered from or directly interfaced to 3.3 V logic without level-shifting circuitry on all I/O and control lines.
PSD834F2-70M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Verified
- Type:
- Programmable Peripherals IC
- Applications:
- 8-Bit MCU Peripherals
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PQFP (10x10)
- Grade:
- -
- Qualification:
- -
PSD834F2-70M FAQ
1.How can I place an order for PSD834F2-70M through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD834F2-70M 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 PSD834F2-70M reliable?
The price and inventory of PSD834F2-70M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD834F2-70M is usually 5 days.
3.What payment methods are accepted for PSD834F2-70M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD834F2-70M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD834F2-70M?
PSD834F2-70M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD834F2-70M 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 PSD834F2-70M?
For technical support, including PSD834F2-70M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD834F2-70M requirements.
6.How does Aetrix verify that PSD834F2-70M is sourced from the original manufacturer or authorized distributors?
All PSD834F2-70M 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 PSD834F2-70M meets industry standards.
7.What is the process for return or replacement of PSD834F2-70M?
All PSD834F2-70M units undergo pre-shipment inspection (PSI). If there is an issue with PSD834F2-70M, 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 PSD834F2-70M part is unused and in its original packaging.
Return procedure for PSD834F2-70M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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