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Infineon Technologies STK14D88-RF25I
- Part No.:
- STK14D88-RF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
STK14D88-RF25I.pdf
- Description:
- IC NVSRAM 256KBIT PAR 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,984
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Product details
Overview
STK14D88-RF25I from Cypress Semiconductor is a 32K × 8 (256 Kb) nonvolatile static RAM with AutoStore functionality, operating from a single 3.0V ±10% supply, featuring 25 ns read access time, unlimited SRAM read/write endurance, and automatic STORE/RECALL on power loss/power-up. It integrates Quantum Trap nonvolatile storage per cell and supports hardware- and software-controlled STORE/RECALL in industrial temperature range (–40°C to +85°C).
For engineers reviewing the STK14D88-RF25I datasheet, STK14D88-RF25I pinout, STK14D88-RF25I application, or STK14D88-RF25I equivalent, key selection criteria include AutoStore timing (12.5 ms), VCAP capacitor requirement (17–120 µF), HSB pin behavior during STORE, and compatibility with legacy SRAM interfaces requiring E/G/W control.
Technical Context
The STK14D88-RF25I implements monolithic nvSRAM architecture with dual-mode operation: standard SRAM mode for high-speed access and nonvolatile mode for data retention. Its Quantum Trap storage element enables true unlimited write cycles without wear leveling, while AutoStore triggers at VCC < 2.65 V and completes within 12.5 ms (industrial max 15 ms).
STORE and RECALL are fully autonomous-no external controller required-but also support manual initiation via HSB assertion or software command sequence. The device maintains full SRAM timing compliance (tRC = 25 ns) during normal operation and suspends all SRAM cycles during STORE/RECALL when VCC falls below VSWITCH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32K × 8 (256 Kb) - matches standard parallel SRAM footprint for drop-in replacement in legacy systems |
| Read Access Time | 25 ns - enables direct interface with 40 MHz microcontrollers without wait states |
| Nonvolatile STORE Time | 12.5 ms - defines minimum power-loss hold-up time required from VCAP capacitor |
| Data Retention | 20 years at 55°C - guarantees long-term archival without refresh or backup power |
| VCC Operating Range | 2.7 V to 3.6 V - compatible with 3.3V systems including industrial I/O controllers and PLCs |
| VCAP Capacitance | 17–120 µF (5V rated) - determines required external tantalum or polymer capacitor size and ESR budget |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, metering, and transportation electronics |
Pinout & Package
STK14D88-RF25I is packaged in a 48-pin SSOP (RF suffix), RoHS-compliant, with 0.635 mm pitch and 10.2 mm × 18.4 mm body size. Pinout supports standard parallel SRAM interface plus dedicated nvSRAM control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-byte addressing; A14 used only in 32K×8 configuration |
| DQ0–DQ7 | Bidirectional Data Bus | 8-bit parallel I/O; tri-stated when G is high or E is high during reads/writes |
| E | Chip Enable (active low) | Primary chip select; must be low for valid read/write; controls SRAM cycle enable |
| G | Output Enable (active low) | Controls output buffer; deasserting G places DQ pins in high-impedance state |
| W | Write Enable (active low) | Enables write operation on falling edge of E; must be high during reads |
| HSB | Hardware Store Busy (open-drain) | Outputs low during STORE; can be externally pulled low to initiate hardware STORE |
| VCAP | AutoStore Capacitor Terminal | Connects external capacitor (17–120 µF) to sustain STORE operation during VCC collapse |
| VCC / VSS | Power / Ground | Single 3.0V supply; VSS is reference ground for all logic and analog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Unlimited SRAM Read/Write Endurance | Eliminates wear-out concerns in high-frequency logging or buffer applications where conventional EEPROM/Flash would fail |
| Automatic Power-Loss STORE | Triggers autonomously at VCC < 2.65 V, removing need for external voltage monitor or supervisor IC |
| Software-Controlled STORE/RECALL | Executed via defined command sequences on DQ lines, enabling deterministic nonvolatile save points in firmware |
| 20-Year Data Retention | Validated at 55°C; ensures data integrity over product lifetime without periodic refresh or verification |
| Industrial Temperature Support | Rated –40°C to +85°C with full AC/DC specs guaranteed, suitable for uncontrolled environments |
Applications
| Smart Energy Metering | Industrial PLC Data Logging |
|---|---|
|
Use Scenario: Storing cumulative kWh, tariff schedules, and event logs across frequent power interruptions in residential/commercial meters. IC Role / Device Role: Nonvolatile data buffer that retains critical billing and diagnostic data without battery backup. Use Value: Eliminates supercapacitor or lithium coin-cell dependencies while guaranteeing 20-year retention of tamper-proof usage records. |
Use Scenario: Capturing sensor readings, alarm timestamps, and process state during factory floor power dips or brownouts. IC Role / Device Role: Real-time SRAM with instant STORE/RECALL, acting as fault-tolerant memory for ladder logic execution context. Use Value: Enables deterministic system recovery within 20 ms after power restoration, preserving machine state without software intervention. |
| Medical Diagnostic Equipment | Avionics Data Recorders |
|
Use Scenario: Buffering real-time ECG waveforms and patient vitals during transient AC line failures in portable monitors. IC Role / Device Role: High-reliability memory holding last 30 seconds of waveform data prior to power loss. Use Value: Meets IEC 60601-1 requirements for uninterrupted data capture without volatile-only SRAM or complex backup circuitry. |
Use Scenario: Recording flight parameters (altitude, attitude, engine status) in black box subsystems subject to rapid power loss. IC Role / Device Role: Crash-protected memory ensuring last-valid data survives mechanical shock-induced power disconnect. Use Value: Provides certified 20-year retention of critical flight data without thermal derating or periodic rewrite cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B108L-ZSP25XI | 1-Mb density, 25 ns access, SPI interface, no HSB pin, requires external STORE command via SPI | Lacks parallel bus compatibility; suited for new designs with SPI-constrained MCU resources | Select if migrating to serial interface and accepting firmware-level STORE control instead of hardware-triggered autonomy |
| FM24CL64B-G | 64 Kb F-RAM, I²C interface, 1 µs write time, no VCAP capacitor needed, but limited to 10⁵ STORE cycles | Lower density, serial interface, finite endurance - not suitable for high-frequency logging | Prefer only for low-power, low-density I²C systems where instantaneous writes outweigh retention duration needs |
Compared with CY14B108L-ZSP25XI and FM24CL64B-G, STK14D88-RF25I uniquely delivers parallel-SRAM compatibility, hardware-initiated STORE, and infinite write endurance - making it irreplaceable in legacy industrial controllers requiring zero-modification memory upgrades.
Availability
STK14D88-RF25I is available at Aetrix Electronics and suitable for smart energy metering, industrial PLC data logging, and medical diagnostic equipment requiring stable component supply and long-term lifecycle assurance.
Supply support for STK14D88-RF25I 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
Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in memory, microcontrollers, and programmable solutions for industrial, automotive, and communications markets.
The STK14D88 belongs to Cypress's nvSRAM product line, engineered to replace battery-backed SRAM in mission-critical systems where reliability, zero-maintenance operation, and regulatory compliance (e.g., RoHS, UL) are mandatory.
FAQ
What is the role of the VCAP pin and how is its capacitance value determined?
The VCAP pin connects an external capacitor (17–120 µF, 5V rated) that supplies energy during VCC collapse to complete the 12.5 ms STORE operation. Capacitance is selected based on worst-case VCC droop rate and load current (ICC4 = 3 mA); lower values suffice for shorter hold-up times, while higher values extend margin for slow-ramp power failures.
Can STK14D88-RF25I be used as a direct replacement for standard 32K×8 SRAMs?
Yes - it is pin- and function-compatible with industry-standard 32K×8 parallel SRAMs (e.g., AS6C4008, IS61LV25616). All control signals (E, G, W), address/data buses, and timing (tRC = 25 ns) match. The only design additions are VCAP capacitor and optional HSB monitoring; no logic changes are required.
How does AutoStore differ from software-controlled STORE?
AutoStore triggers automatically when VCC drops below 2.65 V, requiring no firmware involvement. Software STORE uses a specific 5-cycle command sequence on DQ lines and executes only when VCC is stable - enabling controlled saves before planned shutdown or firmware updates, independent of power conditions.
Is STK14D88-RF25I still recommended for new designs?
No - Cypress officially marks STK14D88 as "Not Recommended for New Designs" (NRND) due to obsolescence planning. However, Aetrix Electronics maintains active inventory and supply chain support for legacy industrial and medical programs requiring long-term continuity and drop-in replacement capability.
STK14D88-RF25I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
STK14D88-RF25I FAQ
1.How can I place an order for STK14D88-RF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14D88-RF25I 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 STK14D88-RF25I reliable?
The price and inventory of STK14D88-RF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14D88-RF25I is usually 5 days.
3.What payment methods are accepted for STK14D88-RF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14D88-RF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14D88-RF25I?
STK14D88-RF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14D88-RF25I 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 STK14D88-RF25I?
For technical support, including STK14D88-RF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14D88-RF25I requirements.
6.How does Aetrix verify that STK14D88-RF25I is sourced from the original manufacturer or authorized distributors?
All STK14D88-RF25I 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 STK14D88-RF25I meets industry standards.
7.What is the process for return or replacement of STK14D88-RF25I?
All STK14D88-RF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK14D88-RF25I, 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 STK14D88-RF25I part is unused and in its original packaging.
Return procedure for STK14D88-RF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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