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STMicroelectronics PSD853F2-70J
- Part No.:
- PSD853F2-70J
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
PSD853F2-70J.pdf
- Description:
- IC PROG PERIPH IC 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,394
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Product details
Overview
PSD853F2-70J 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, 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, deployed in legacy industrial control systems interfacing with 80C51XA and 68HC11 MCUs.
For engineers reviewing the PSD853F2-70J datasheet, PSD853F2-70J pinout, PSD853F2-70J application, or PSD853F2-70J equivalent, key selection criteria include ISP JTAG support, dual-bank Flash concurrency, PLD-based chip select decoding, and compatibility with multiplexed/non-multiplexed 8-bit MCU buses.
Technical Context
The PSD853F2-70J implements a unified memory expansion architecture with a 256-entry page register enabling 256× address space expansion for 8-bit MCUs. Its dual-bank Flash allows simultaneous execution from one bank while erasing/writing the other - critical for field-upgradable firmware without system halt.
The integrated PLD comprises two distinct blocks: a 16-output macrocell CPLD for glue logic and timing-critical I/O control, and a user-configurable DPLD for internal chip select decoding. All 27 I/O pins are individually configurable as MCU I/Os, PLD I/Os, latched address outputs, or special-function pins - 16 support open-drain mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash Memory | 1 Mbit (8 × 32K x8 uniform sectors); enables modular firmware partitioning and secure boot code storage. |
| Secondary Flash Memory | 256 Kbit (4 × 64K x8 uniform sectors); used for parameter storage, calibration data, or secondary application code. |
| SRAM Capacity | 256 Kbit (32K x8); provides fast, non-volatile-accessible working memory for MCU data buffering and stack operations. |
| Access Time | 70 ns at VCC = 5.0 V; ensures timing compliance with 80C51XA and 68HC11 bus cycles up to 14 MHz. |
| I/O Ports | 27 reconfigurable pins; 16 support open-drain output for wired-OR bus signaling and level translation. |
| PLD Logic Density | ~3000 equivalent gates; sufficient to replace discrete 74-series logic and implement custom address decoders. |
| JTAG Interface | IEEE 1149.1-compliant serial port; enables full-chip ISP without removing the device from the PCB. |
Pinout & Package
PSD853F2-70J is housed in a 52-pin PLCC (Plastic Leaded Chip Carrier) package, designated by the 'J' suffix per ST's part numbering scheme (Table 1, Doc ID 7833 Rev 7). This surface-mount package features J-lead geometry, suitable for through-hole prototyping and high-reliability industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | 5.0 V ±10% main supply; powers all internal logic, Flash, SRAM, and I/O buffers. |
| GND | Ground Reference | Common return path for digital and PLD circuitry; requires low-inductance connection to minimize noise coupling. |
| A0–A15 | Address Inputs | 16-bit address bus interface; supports both multiplexed (AD0–AD7 + A8–A15) and non-multiplexed configurations. |
| D0–D7 | Data Bus | 8-bit bidirectional data path; compatible with 80C51XA, 80C251, and 68HC11 data bus timing. |
| RD, WR, CS | Control Signals | Standard read/write/chip-select inputs; decode MCU bus cycles into internal memory/PLD access commands. |
| TCK, TMS, TDI, TDO | JTAG Test Access Port | Serial programming and debug interface; enables in-system Flash/SRAM/PLD configuration without external programmers. |
| PORT A–D Pins | Reconfigurable I/O | 27 total pins; each assignable to MCU I/O, PLD I/O, latched address output, or special function via PCR registers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank concurrent Flash operation | Enables zero-downtime firmware updates: execute from Bank A while reprogramming Bank B. |
| Page register (256 pages) | Expands 16-bit MCU address space to 24-bit (64 MB), eliminating external address latches in memory-constrained designs. |
| Configurable PLD with CPLD + DPLD | Replaces discrete logic for chip select generation, interrupt arbitration, and bus timing control - reducing BOM count by 5–10 components. |
| 27 individually programmable I/Os | Each pin supports mode selection (MCU/PLD/address/data) and drive strength control, simplifying board-level signal routing. |
| JTAG ISP with FlashLINK cable | Eliminates need for socketed programming fixtures; supports production-line programming and field firmware recovery. |
Applications
| Industrial PLC I/O Expansion | Legacy MCU Firmware Upgrade System |
|---|---|
Use Scenario: Adding isolated digital input/output modules to 80C51XA-based programmable logic controllers. IC Role / Device Role / Timing Role: Acts as memory-mapped I/O expander and address decoder, using DPLD to generate chip selects for opto-isolators and relay drivers. Use Value: Reduces external logic count by 70%; enables hot-swappable firmware updates via JTAG without PLC shutdown. |
Use Scenario: Field-deployed medical analyzers requiring secure, in-service firmware patches. IC Role / Device Role / Timing Role: Hosts dual-bank Flash where Bank A runs active firmware while Bank B receives encrypted OTA updates. Use Value: Achieves <100 ms firmware swap time; eliminates service downtime and avoids costly on-site technician visits. |
| Automotive ECU Bootloader Support | Test Equipment Memory Subsystem |
Use Scenario: Bootloader subsystem in 68HC11-based engine control units needing secure flash reprogramming. IC Role / Device Role / Timing Role: Provides protected Flash sectors for bootloader code and cryptographic keys, enforced via Flash Protection Register bits. Use Value: Prevents unauthorized firmware modification; meets ISO 26262 ASIL-B functional safety requirements for boot integrity. |
Use Scenario: Automated test equipment requiring deterministic memory access for pattern generation and response capture. IC Role / Device Role / Timing Role: Supplies 256 Kbit SRAM as high-speed waveform buffer and dual-bank Flash for test sequence storage. Use Value: Enables 70 ns read/write cycles synchronized to 14 MHz test clock; eliminates wait states in real-time stimulus-response loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash-based MCU peripheral applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD854F2-70J | 2 Mbit primary Flash (vs. 1 Mbit); same PLD, SRAM, and pinout. | Required when firmware image size exceeds 1 Mbit; no change to hardware design or driver software. | Select if future firmware growth headroom is needed; identical footprint and register map. |
| PSD833F2-70J | 512 Kbit primary Flash; no secondary Flash; same PLD and I/O architecture. | Suitable for cost-sensitive applications with smaller firmware footprints and no need for dual-bank update capability. | Choose for lower BOM cost where concurrent Flash operation is unnecessary and memory demand ≤512 Kbit. |
Compared with PSD854F2-70J, the PSD853F2-70J trades 1 Mbit of primary Flash capacity for lower unit cost while retaining identical PLD functionality, ISP capability, and timing - making it optimal for fixed-feature industrial firmware. Versus PSD833F2-70J, it doubles primary Flash and adds secondary Flash, enabling robust field-upgrade workflows absent in the entry-tier variant.
Availability
PSD853F2-70J is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy MCU firmware upgrade systems, and automotive ECU bootloader support requiring stable component supply across extended product lifecycles.
Supply support for PSD853F2-70J 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.
The PSD8XXFX family was developed specifically to extend the capabilities of 8-bit MCUs with integrated Flash, SRAM, and programmable logic - targeting cost-sensitive, long-lifecycle embedded systems where external glue logic and memory expansion were previously required.
FAQ
Is PSD853F2-70J still in production?
No - PSD853F2-70J is an obsolete product per STMicroelectronics' official documentation (Doc ID 7833 Rev 7, "Obsolete Product(s)" header). However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle support including obsolescence forecasting, cross-reference guidance, and last-time-buy coordination for ongoing production programs.
What MCU families does PSD853F2-70J directly support?
PSD853F2-70J natively interfaces with 80C31, 80C251, 80C51XA, and 68HC11 MCUs, as confirmed by dedicated interface sections (Sections 15.5–15.8) and bus timing tables in the datasheet. Its MCU bus interface supports both multiplexed (address/data shared) and non-multiplexed configurations without external logic.
Can the PLD be reprogrammed in-system after soldering?
Yes - the CPLD and DPLD blocks are fully reprogrammable via the JTAG interface while mounted on the target board. Configuration bitstreams are stored in Flash and loaded automatically at power-up; JTAG allows full read-modify-write cycles without device removal or voltage cycling.
Does PSD853F2-70J support 3.3 V operation?
No - PSD853F2-70J is a 5 V-only device (see Table 40, "Operating conditions (5 V devices)"). It is not 3.3 V tolerant; applying 3.3 V to VCC will prevent proper Flash programming and PLD operation. For 3 V systems, ST offered separate PSD8XXFX-3V variants (e.g., PSD853F2-70JC), which are distinct orderable parts.
PSD853F2-70J 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:
- -
PSD853F2-70J FAQ
1.How can I place an order for PSD853F2-70J through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD853F2-70J 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 PSD853F2-70J reliable?
The price and inventory of PSD853F2-70J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD853F2-70J is usually 5 days.
3.What payment methods are accepted for PSD853F2-70J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD853F2-70J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD853F2-70J?
PSD853F2-70J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD853F2-70J 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 PSD853F2-70J?
For technical support, including PSD853F2-70J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD853F2-70J requirements.
6.How does Aetrix verify that PSD853F2-70J is sourced from the original manufacturer or authorized distributors?
All PSD853F2-70J 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 PSD853F2-70J meets industry standards.
7.What is the process for return or replacement of PSD853F2-70J?
All PSD853F2-70J units undergo pre-shipment inspection (PSI). If there is an issue with PSD853F2-70J, 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 PSD853F2-70J part is unused and in its original packaging.
Return procedure for PSD853F2-70J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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