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STMicroelectronics PSD853F2-70M
- Part No.:
- PSD853F2-70M
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized ICs
- Package:
- 52-QFP
- Datasheet:
-
PSD853F2-70M.pdf
- Description:
- IC PROG PERIPH IC 52PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,642
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Product details
Overview
PSD853F2-70M from STMicroelectronics is a Flash in-system programmable (ISP) peripheral IC for 8-bit microcontrollers, integrating dual-bank Flash (1.5 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 PSD853F2-70M datasheet, PSD853F2-70M pinout, PSD853F2-70M application, or PSD853F2-70M 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 PSD853F2-70M implements a tightly coupled memory-peripheral architecture where the primary Flash (8 × 32K × 8) and secondary Flash (4 × 64K × 8) operate independently-enabling simultaneous execution from one bank while erasing/writing to the other. Its page register expands MCU address space by 256×, critical for 8-bit systems with limited 64 KB addressing.
The integrated PLD comprises two distinct blocks: a 16-output macrocell CPLD for glue logic and timing-critical functions, and a user-configurable DPLD for internal chip select decoding. All 27 I/Os are individually configurable as MCU I/O, PLD I/O, latched address outputs, or special-function pins-with 16 supporting open-drain mode for bus arbitration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Primary Flash | 1.5 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 parameter storage, boot loader, or configuration data. |
| SRAM | 256 Kbit; provides fast, non-volatile-accessible data memory for real-time variables and buffers. |
| Access Time | 70 ns at 5 V; ensures timing compliance with 80C51/80C251/68HC11 buses running ≤14 MHz. |
| I/O Ports | 27 reconfigurable pins; 16 support open-drain for wired-AND interrupt sharing or bus pull-down. |
| PLD Capacity | ~3000 gates; includes 16 OMCs and 24 IMCs for custom address decoding and state-machine logic. |
| JTAG Interface | IEEE 1149.1-compliant serial port; enables full-chip ISP without external programming hardware beyond FlashLINK cable. |
Pinout & Package
PQFP52 (Plastic Quad Flat Package, 52-pin, 0.65 mm pitch) per ECOPACK® specification. Pin assignments validated against STMicroelectronics Doc ID 7833 Rev 7, Appendix A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply | 5 V ±10% main supply; powers all logic, Flash, SRAM, and PLD blocks. |
| GND | Ground reference | Common return path for digital and PLD circuitry; requires low-impedance PCB plane. |
| A0–A15 | Address inputs | 16-bit address bus interface; supports both multiplexed (AD0–AD7 + A8–A15) and non-multiplexed modes. |
| D0–D7 | Data bus | 8-bit bidirectional data path; compatible with 80C51, 80C251, and 68HC11 data bus timing. |
| RD, WR, CS | Control signals | Standard read/write/chip-select strobes; directly interface MCU control bus without glue logic. |
| TCK, TMS, TDI, TDO | JTAG boundary-scan | Enable in-system programming and debug; TDO is dedicated output, others shared with Port C pins. |
| RESET | Active-low reset input | Synchronizes internal state on power-up or warm reset; asserts during Flash erase/program timeout. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-bank Flash concurrency | Read from primary Flash while erasing/writing secondary Flash-eliminates system halt during firmware updates. |
| Page register expansion | 256× address space extension via internal 8-bit page register; enables >64 KB code/data mapping on 8-bit MCUs. |
| Configurable I/O architecture | 27 pins individually assignable to MCU I/O, PLD I/O, latched address, or special function-reducing external logic count. |
| Integrated DPLD decoding | User-defined internal chip select logic replaces discrete decoders; supports dynamic memory mapping per MCU mode. |
| Programmable power management | Automatic Power-down (APD) unit reduces standby current to <100 µA; configurable via PMMR registers. |
Applications
| Industrial PLC I/O Module | Legacy Automotive ECU |
|---|---|
Use Scenario: Compact 80C51-based controller managing discrete sensor inputs and relay outputs in factory automation cabinets. IC Role / Device Role / Timing Role: Acts as unified memory + glue logic + I/O expander-replacing multiple EPROMs, PALs, and latch ICs. Use Value: Reduces BOM count by 4–6 components; enables field firmware updates via JTAG without board removal. |
Use Scenario: Engine control unit retrofit for pre-OBD-II vehicles using 80C251 MCU with limited address space. IC Role / Device Role / Timing Role: Provides expanded program memory (primary Flash) and protected calibration data storage (secondary Flash). Use Value: Supports 256× address expansion via page register-allowing full 16 MB virtual space on 80C251's 64 KB physical bus. |
| Medical Infusion Pump Controller | Point-of-Sale Terminal Baseboard |
Use Scenario: Safety-critical 68HC11-based pump controller requiring dual-code banking for fail-safe operation. IC Role / Device Role / Timing Role: Hosts primary firmware and redundant backup image in separate Flash banks; PLD enforces lock-step execution checks. Use Value: Concurrent read-erase-write allows background integrity verification without interrupting motor control loops. |
Use Scenario: Embedded terminal with 80C51 MCU managing keypad, display, and serial peripherals under tight cost constraints. IC Role / Device Role / Timing Role: Replaces discrete address decoders and SRAM with single-chip solution; DPLD handles dynamic peripheral chip selects. Use Value: Eliminates 3–4 SMT components; open-drain I/Os enable shared interrupt lines across keyboard and display controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash+PLD peripheral applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PSD854F2-70M | 2 Mbit primary Flash (vs. 1.5 Mbit); identical package, timing, and PLD architecture. | Required when firmware image exceeds 1.5 Mbit; no change to PCB layout or driver software. | Select if future firmware growth mandates larger primary code space without redesign. |
| PSD833F2-70M | 1 Mbit primary Flash, no secondary Flash; same 27 I/O, PLD, and JTAG features. | Suitable for simpler 8-bit systems with smaller code footprint and no need for protected configuration storage. | Choose for cost-sensitive designs where secondary Flash and dual-bank concurrency are unnecessary. |
Compared with PSD854F2-70M, the PSD853F2-70M trades 512 Kbit of primary Flash capacity for lower unit cost and identical PLD/SRAM/JTAG functionality; versus PSD833F2-70M, it adds 512 Kbit primary Flash and 256 Kbit secondary Flash-enabling secure parameter storage and firmware redundancy.
Availability
PSD853F2-70M is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy automotive ECUs, medical infusion pump controllers, and point-of-sale terminal baseboards requiring stable component supply and long-term obsolescence mitigation.
Supply support for PSD853F2-70M 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, analog ICs, power management, and automotive-grade silicon.
The PSD8XXFX family was designed specifically to replace discrete memory, logic, and I/O components in 8-bit MCU systems-integrating Flash, SRAM, PLD, and ISP into a single programmable peripheral with ECOPACK® environmental compliance.
FAQ
Is PSD853F2-70M still in production?
No-STMicroelectronics has marked the PSD853F2-70M as obsolete per Doc ID 7833 Rev 7. However, Aetrix Electronics maintains verified legacy stock with full traceability, extended warranty, and engineering support for ongoing production and repair programs.
What MCU families does PSD853F2-70M directly support?
The device natively interfaces with 80C51, 80C251, 80C51XA, and 68HC11 MCUs via documented bus timing and control signal mappings. Its MCU bus interface supports both multiplexed (AD0–AD7 + A8–A15) and non-multiplexed configurations without external logic.
Can the PLD be reconfigured independently of Flash/SRAM?
Yes-the CPLD and DPLD blocks are programmed separately via JTAG using ST's PSDSoft development tools. PLD configuration persists through power cycles and does not interfere with Flash erase/write operations or SRAM contents.
Does PSD853F2-70M support 3.3 V operation?
No-it is a 5 V-only device (VCC = 4.5–5.5 V) per Table 40 in Doc ID 7833 Rev 7. There is no 3 V variant; attempting 3.3 V operation will result in undefined behavior and failure to meet AC/DC specifications.
PSD853F2-70M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Programmable Peripherals IC
- Applications:
- 8-Bit MCU Peripherals
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PQFP (10x10)
- Grade:
- -
- Qualification:
- -
PSD853F2-70M FAQ
1.How can I place an order for PSD853F2-70M through Aetrix?
Please submit a Request for Quotation (RFQ) for PSD853F2-70M 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 PSD853F2-70M reliable?
The price and inventory of PSD853F2-70M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD853F2-70M is usually 5 days.
3.What payment methods are accepted for PSD853F2-70M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD853F2-70M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PSD853F2-70M?
PSD853F2-70M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PSD853F2-70M 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 PSD853F2-70M?
For technical support, including PSD853F2-70M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD853F2-70M requirements.
6.How does Aetrix verify that PSD853F2-70M is sourced from the original manufacturer or authorized distributors?
All PSD853F2-70M 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 PSD853F2-70M meets industry standards.
7.What is the process for return or replacement of PSD853F2-70M?
All PSD853F2-70M units undergo pre-shipment inspection (PSI). If there is an issue with PSD853F2-70M, 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 PSD853F2-70M part is unused and in its original packaging.
Return procedure for PSD853F2-70M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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