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Home > Products > Integrated Circuits (ICs) > Specialized ICs

STMicroelectronics PSD834F2V-20JI

Name: PSD834F2V-20JI
Brand: STMicroelectronics
SKU: PSD834F2V-20JI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PSD834F2V-20JI

Manufacturer:: STMicroelectronics

Category:: Specialized ICs

Package:: 52-LCC (J-Lead)

Datasheet:: PSD834F2V-20JI.pdf

Description:: IC PROG PERIPH IC 52PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

PSD834F2V-20JI from STMicroelectronics is a Flash Programmable System Device (PSD) 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 - all optimized for 8-bit MCU interfacing with single 3.3 V ±10% supply. It supports in-system programming (ISP) via JTAG, concurrent code execution and update, and programmable power management with 25 µA standby current.

For engineers reviewing the PSD834F2V-20JI datasheet, PSD834F2V-20JI pinout, PSD834F2V-20JI application, or PSD834F2V-20JI equivalent, key selection criteria include Flash sector architecture (8×256 KB + 4×64 KB), PLD macrocell count (16 OMCs / 24 IMCs), JTAG ISP capability, page register–enabled address expansion (×256), and support for multiplexed/non-multiplexed 8-bit buses (e.g., 8051, 68HC11, Z80).

Technical Context

The PSD834F2V implements a dual-bank Flash architecture enabling true in-application programming (IAP): code executes from secondary Flash while primary Flash is erased or programmed. Its DPLD handles memory block decoding with 17 combinatorial outputs and 42 product terms, while the CPLD provides 16 output macrocells and 24 input macrocells for custom logic implementation.

Bus interface logic auto-synchronizes with standard 8-bit MCU control signals (RD, WR, ALE, CS), eliminating external glue logic. The integrated Page Register extends MCU address space by 256×, and the Power Management Unit (PMMR0/PMMR2) enables runtime CPLD sleep mode and automatic power-down during MCU inactivity.

Key Specifications

Parameter	Value and Actual Design Meaning
Primary Flash	2 Mbit (256K × 8), 8 uniform sectors - enables selective erase/write without full-device interruption
Secondary Flash	256 Kbit (32K × 8), 4 uniform sectors - supports concurrent execution and firmware update
SRAM	64 Kbit battery-backed - retains data during main power loss when VSTBY (PC2) is connected to backup source
CPLD Capacity	16 output macrocells + 24 input macrocells - implements state machines, counters, and peripheral control logic
DPLD Capacity	73 inputs, 17 outputs, 42 product terms - decodes MCU address bus to select Flash/SRAM sectors and registers
JTAG ISP	Full-chip programming/erasure via TMS/TCK/TDI/TDO on Port C - eliminates need for external programmer or boot EPROM
Page Register	8-bit register enabling 256× address space expansion - maps Flash/SRAM blocks into disjoint memory windows for IAP
Standby Current	25 µA - achieved via PMU-controlled CPLD sleep and APD unit activation during MCU idle periods

Pinout & Package

PSD834F2V-20JI is packaged in a 52-pin PLCC (J suffix), with lead-free finish and JEDEC-standard footprint. Pin functions are fully configurable per port (A–D), supporting MCU I/O, PLD I/O, latched address output, and JTAG serial programming.

Pin/Terminal	Circuit Role	Design Meaning
PA0–PA7	Port A I/O	8-bit bidirectional port configurable as MCU data/address latch or PLD I/O
PB0–PB7	Port B I/O	8-bit bidirectional port supporting non-multiplexed bus data transfer or PLD interface
PC0–PC7	Port C I/O	Includes JTAG pins (PC0=TMS, PC1=TCK, PC3=TSTAT, PC4=TERR, PC5=TDI, PC6=TDO); PC2=VSTBY for SRAM battery backup
PD0–PD2	Port D I/O	3-bit port; PD2=CSI (Chip Select Input) - active-low enable for PSD memory mapping
AD0–AD15	Address/Data Bus	Multiplexed 16-bit bus - latched internally using ALE-compatible timing
CLKIN (PD1)	Input Clock	External clock source for internal timing; required for JTAG and PLD operation
INTRF	Interrupt Output	Open-drain interrupt signal driven by PLD or internal status flags to notify MCU of events

Key Features

Feature	Design Value
Dual Flash Architecture	Enables simultaneous code execution (from secondary Flash) and firmware update (to primary Flash), eliminating IAP hardware/software overhead
Configurable I/O Ports	All 27 pins individually assignable to MCU I/O, PLD I/O, address latching, or JTAG - reduces external logic and PCB routing complexity
Integrated Page Register	Expands 8-bit MCU address space to access >16 MB of combined Flash/SRAM - simplifies memory paging for large applications
Programmable Power Management	Automatic power-down triggered by MCU inactivity; CPLD Turbo Bit disables propagation until input transition - cuts dynamic power by >90%
Fast-JTAG Programming	Full device programming in ≤7 seconds - accelerates development iteration and field firmware updates

Applications

Industrial PLC Controller

Medical Diagnostic Handheld

Use Scenario: Compact, battery-powered controller executing real-time ladder logic while storing configuration and logs in non-volatile memory.

IC Role / Device Role / Timing Role: PSD834F2V serves as unified memory + logic subsystem - replacing discrete Flash, SRAM, and CPLD with single chip interfaced to 8051-based MCU.

Use Value: Concurrent secondary Flash execution allows firmware updates without halting control loop; 64 Kbit SRAM retains critical state during brownout when backed by coin cell on PC2.

Use Scenario: Portable ultrasound device requiring secure, field-upgradable firmware and deterministic response to sensor interrupts.

IC Role / Device Role / Timing Role: Acts as boot memory manager and peripheral logic engine - hosts boot code in secondary Flash, runs application from primary Flash, and implements sensor interface timing via CPLD.

Use Value: JTAG ISP enables certified firmware patches without device disassembly; DPLD decodes 16-bit address bus to map 256 KB Flash pages into 8051's 64 KB address space.

Automotive Body Control Module

Legacy Industrial HMI Terminal

Use Scenario: Dashboard cluster controller managing CAN messaging, LED drivers, and EEPROM-less calibration storage.

IC Role / Device Role / Timing Role: Provides Flash-based firmware storage, SRAM for CAN message buffering, and CPLD for GPIO expansion and PWM generation.

Use Value: 100,000 Flash endurance supports lifetime over-the-air updates; programmable PMU reduces quiescent current to 25 µA during sleep mode - meets automotive low-power requirements.

Use Scenario: Retrofit terminal for legacy factory equipment using Z80 CPU, requiring extended memory and custom I/O decoding.

IC Role / Device Role / Timing Role: Replaces multiple discrete chips (27C512 EPROM, 62256 SRAM, GAL16V8) - interfaces directly to Z80 bus with no wait-state insertion.

Use Value: DPLD replicates legacy address decode logic in-field; Page Register maps 2 MB Flash across Z80's 64 KB space via software-managed bank switching.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Flash+PLD+SRAM integrated memory system applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PSD813F2V-20JI	1 Mbit primary Flash (4 sectors), no secondary Flash, same CPLD/DPLD resources and I/O count	Lacks concurrent IAP capability; suitable only for static firmware deployments	Select when firmware size ≤1 MB and field updates are infrequent or performed via full-reload
PSD835F2V-20JI	4 Mbit primary Flash (16 sectors), 512 Kbit secondary Flash, identical architecture and pinout	Double Flash capacity enables larger applications and redundant firmware images	Select when >2 MB code space or dual-image fail-safe boot is required

Compared with PSD813F2V-20JI, the PSD834F2V-20JI adds essential IAP capability via secondary Flash and doubles primary memory; versus PSD835F2V-20JI, it trades capacity for cost and footprint efficiency while retaining identical PLD, I/O, and power features.

Availability

PSD834F2V-20JI is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and legacy Z80/8051-based HMI terminals requiring stable component supply and long-term lifecycle support.

Supply support for PSD834F2V-20JI 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 specializing in microcontrollers, power management, and embedded memory solutions for industrial, automotive, and consumer applications.

The PSD (Programmable System Device) family was designed to consolidate Flash memory, SRAM, and programmable logic into a single IC for 8-bit MCU systems - reducing board area, BOM count, and design complexity while enabling field-upgradable firmware.

FAQ

What MCU families does PSD834F2V-20JI natively support?

PSD834F2V-20JI supports Intel 8031/8051XA/80196/80186/80C251/80386EX, Motorola 68HC11/68HC12/68HC16/683XX, Philips 8031/8051XA, and Zilog Z80/Z8 MCUs. Its bus interface auto-synchronizes with standard RD/WR/ALE/CS signals, requiring no external address latches or glue logic for either multiplexed or non-multiplexed configurations.

How is in-application programming (IAP) implemented without external hardware?

IAP is enabled by the dual Flash architecture: code executes from the 256 Kbit secondary Flash while the 2 Mbit primary Flash is erased or programmed. The MCU runs Flash programming algorithms from secondary Flash or SRAM, using the internal DPLD to manage sector selects and the Page Register to remap memory windows - no external programmer or boot EPROM is needed.

Can the CPLD and DPLD be reprogrammed in the field?

Yes - both PLDs are reprogrammable via JTAG ISP using the TMS/TCK/TDI/TDO pins on Port C. The DPLD can also be updated through the MCU using the internal Flash loader, while the CPLD requires JTAG or an external device programmer. Configuration bit retention is guaranteed for ≥15 years per specification.

What is the role of the VSTBY pin (PC2) and how is SRAM battery backup implemented?

VSTBY (PC2) is the voltage standby input for the 64 Kbit SRAM. When connected to a 2.0–3.6 V backup source (e.g., coin cell), it maintains SRAM data during main VCC loss. The SRAM retains contents as long as VSTBY remains ≥2.0 V, independent of VCC status - enabling reliable data preservation in power-fail scenarios without external supervision circuitry.

PSD834F2V-20JI 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-20JI FAQ

1.How can I place an order for PSD834F2V-20JI through Aetrix?

Please submit a Request for Quotation (RFQ) for PSD834F2V-20JI 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-20JI reliable?

The price and inventory of PSD834F2V-20JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PSD834F2V-20JI is usually 5 days.

3.What payment methods are accepted for PSD834F2V-20JI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PSD834F2V-20JI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PSD834F2V-20JI?

PSD834F2V-20JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PSD834F2V-20JI 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-20JI?

For technical support, including PSD834F2V-20JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PSD834F2V-20JI requirements.

6.How does Aetrix verify that PSD834F2V-20JI is sourced from the original manufacturer or authorized distributors?

All PSD834F2V-20JI 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-20JI meets industry standards.

7.What is the process for return or replacement of PSD834F2V-20JI?

All PSD834F2V-20JI units undergo pre-shipment inspection (PSI). If there is an issue with PSD834F2V-20JI, 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-20JI part is unused and in its original packaging.

Return procedure for PSD834F2V-20JI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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