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Infineon Technologies STK14C88-NF25I
- Part No.:
- STK14C88-NF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK14C88-NF25I.pdf
- Description:
- IC NVSRAM 256KBIT PAR 32SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,876
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Product details
Overview
STK14C88-NF25I from Cypress Semiconductor is a 32K × 8 (256 Kb) nonvolatile static RAM with integrated Quantum Trap storage, delivering 25 ns read access time, automatic STORE on power loss, and automatic RECALL at power-up. It operates from a single 5V ±10% supply, supports industrial temperature range (–40°C to +85°C), and uses a 32-pin 300-mil SOIC package for embedded data logging and configuration retention in programmable logic controllers.
For engineers reviewing the STK14C88-NF25I datasheet, STK14C88-NF25I pinout, STK14C88-NF25I application, or STK14C88-NF25I equivalent, key selection criteria include AutoStore timing behavior, HSB-controlled hardware STORE initiation, VCAP capacitor interface requirements, and compatibility with legacy SRAM bus protocols in industrial control systems.
Technical Context
The STK14C88-NF25I integrates volatile SRAM and nonvolatile Quantum Trap cells monolithically, enabling atomic STORE/RECALL without external controllers. Its dual-cycle architecture separates SRAM operation (with E/G/W control) from nonvolatile management (via HSB or software command), ensuring deterministic 10 ms STORE duration and guaranteed data retention for 100 years.
Hardware STORE is triggered by pulling HSB low while holding E and G inactive; software STORE requires specific address/data sequences during active SRAM mode. The device maintains full SRAM timing compliance (tAVAV = 25 ns, tRC = 25 ns) while supporting unlimited read/write cycles and 1 million STORE cycles - distinct from battery-backed or EEPROM-based alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32K × 8 bits (256 Kb) - supports byte-wide microcontroller interfaces without address multiplexing |
| Read Access Time | 25 ns - meets high-speed SRAM timing for 40 MHz bus operation in real-time control systems |
| STORE Cycle Duration | 10 ms - defines minimum power-loss hold-up time required on VCAP capacitor |
| Data Retention | 100 years - enables long-term configuration storage without refresh or backup power |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic families and avoids level-shifting complexity |
| Temperature Range | –40°C to +85°C - qualified for industrial automation environments with thermal cycling |
| Endurance | 1 million STORE cycles - sets lifetime limit for frequent power-cycle applications like metering endpoints |
Pinout & Package
Package: 32-pin 300-mil SOIC (RoHS-compliant), surface-mount, 0.3-inch body width, standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus for full 32K-byte addressing; no address multiplexing required |
| DQ0–DQ7 | Bi-directional Data I/O | 8-bit parallel data path; tristates when G is high or E is inactive |
| E | Chip Enable (active-low) | Primary device select; must be low for read/write; controls standby current entry |
| G | Output Enable (active-low) | Enables DQ outputs during reads; high impedance when deasserted |
| W | Write Enable (active-low) | Initiates write cycle on falling edge of E; latches data into SRAM array |
| HSB | Hardware Store Busy (I/O) | Open-drain output indicating STORE progress; input to trigger hardware STORE when pulled low |
| VCAP | AutoStore Capacitor Supply | Connects external capacitor (typically 4.7 µF tantalum) to sustain STORE during VCC collapse |
| VCC | Power Supply | 5V ±10% main supply; powers both SRAM and Quantum Trap circuitry |
| VSS | Ground | Reference return for all digital and analog functions including STORE charge transfer |
Key Features
| Feature | Design Value |
|---|---|
| Automatic STORE on Power Loss | Monitors VCC drop in real time and initiates nonvolatile save within 1 µs, eliminating need for external voltage detectors or supervisors |
| Unlimited SRAM Read/Write Endurance | Supports continuous logging or buffer updates without wear-out concerns - unlike flash or EEPROM |
| Software-Controlled STORE/RECALL | Enables deterministic nonvolatile operations via standard SRAM bus writes, avoiding hardware signal routing constraints |
| 100-Year Data Retention | Quantum Trap cell stability ensures configuration integrity across product lifecycles without periodic refresh |
| Industrial Temperature Support | Validated operation from –40°C to +85°C enables deployment in DIN-rail PLCs and motor drives without derating |
Applications
| Programmable Logic Controller (PLC) Configuration Storage | Industrial Data Logger Memory |
|---|---|
Use Scenario: Retaining user-defined ladder logic parameters and I/O mapping across unexpected AC mains failure. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate STORE upon brownout detection and instant RECALL at next power-on reset. Use Value: Eliminates battery replacement maintenance and avoids configuration loss during grid instability events. | Use Scenario: Capturing sensor readings at 100 Hz in remote environmental monitoring stations powered by solar/battery. IC Role / Device Role / Timing Role: High-endurance memory buffer that saves latest dataset before shutdown and restores it on wake-up. Use Value: Ensures no measurement gap due to power interruption; supports >1 million STORE cycles over 10-year field life. |
| Medical Device Calibration Data Retention | Telecom Base Station Boot Configuration |
Use Scenario: Preserving factory calibration coefficients and user-adjusted gain settings in portable ultrasound units. IC Role / Device Role / Timing Role: Secure, tamper-resistant nonvolatile storage with 100-year retention and zero refresh overhead. Use Value: Meets IEC 62304 Class C software safety requirements for persistent parameter storage without external supervision. | Use Scenario: Storing FPGA bitstream checksums and radio channel initialization tables in outdoor macrocell base stations. IC Role / Device Role / Timing Role: Fast-access memory with deterministic 25 ns read timing and reliable STORE under wide-temperature power cycling. Use Value: Reduces boot time by 120 ms versus serial EEPROM load, improving network recovery after outage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK14CA8-NF25I | Same pinout and function but with extended military temperature range (–55°C to +125°C); higher ICC1 standby current (31 mA vs. 26 mA) | Required for aerospace or downhole oil/gas instrumentation where extended thermal qualification is mandated | Select only if MIL-STD-883 compliance or –55°C operation is contractually required |
| FM24CL64-G | 64 Kb F-RAM with 10-year retention, 3.3V supply, I²C interface; no VCAP capacitor or HSB pin needed | Suitable for low-power, space-constrained designs where serial interface and lower voltage simplify PCB layout | Choose when migrating from parallel bus to I²C and reducing bill-of-materials count is prioritized over 100-year retention |
Compared with STK14CA8-NF25I, the STK14C88-NF25I offers lower industrial-grade standby current and cost savings where military temp is unnecessary; versus FM24CL64-G, it delivers superior retention and parallel-bus speed but requires VCAP design and more board area.
Availability
STK14C88-NF25I is available at Aetrix Electronics and suitable for programmable logic controllers, industrial data loggers, medical calibration systems, and telecom base station configuration requiring stable component supply across extended product lifecycles.
Supply support for STK14C88-NF25I 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 connectivity solutions for industrial, automotive, and consumer markets.
The STK14C88 belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM in mission-critical systems where reliability, zero-maintenance operation, and deterministic nonvolatile save timing are essential.
FAQ
What is the required VCAP capacitor value and type for reliable AutoStore operation?
The STK14C88-NF25I requires a minimum 4.7 µF tantalum capacitor rated for ≥6.3 V on the VCAP pin. Ceramic capacitors are not recommended due to insufficient energy storage and voltage droop during the 10 ms STORE cycle. Typical design uses a 4.7 µF/10 V tantalum with ESR < 1 Ω to ensure full data transfer before VCAP drops below 2.0 V.
Can STK14C88-NF25I be used as a direct replacement for standard 32K×8 SRAMs like AS6C4008?
Yes, but only for read/write functionality - the STK14C88-NF25I is pin-compatible with AS6C4008 in 32-pin SOIC, sharing identical address/data/control pinouts. However, VCAP and HSB pins must be properly terminated (VCAP to capacitor, HSB pulled up via 10 kΩ), and software must avoid writing to reserved addresses used for software STORE/RECALL commands.
Does the device perform STORE automatically during every power-down event?
Yes - the internal power-loss detector triggers STORE whenever VCC falls below the threshold (~4.25 V), provided sufficient charge remains on VCAP to complete the 10 ms operation. No firmware intervention is required, and STORE occurs even if the device is in standby mode, making it fully transparent to system software.
Is the STK14C88-NF25I compliant with RoHS and REACH regulations?
Yes - the STK14C88-NF25I is RoHS-2 (2011/65/EU) and REACH (EC 1907/2006) compliant, with lead-free terminations and halogen-free molding compound. The 32-pin 300-mil SOIC package carries the "NF" suffix denoting RoHS-compliant packaging per Cypress ordering nomenclature.
STK14C88-NF25I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 32-SOIC (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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOIC
STK14C88-NF25I FAQ
1.How can I place an order for STK14C88-NF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK14C88-NF25I 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 STK14C88-NF25I reliable?
The price and inventory of STK14C88-NF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK14C88-NF25I is usually 5 days.
3.What payment methods are accepted for STK14C88-NF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK14C88-NF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK14C88-NF25I?
STK14C88-NF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK14C88-NF25I 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 STK14C88-NF25I?
For technical support, including STK14C88-NF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK14C88-NF25I requirements.
6.How does Aetrix verify that STK14C88-NF25I is sourced from the original manufacturer or authorized distributors?
All STK14C88-NF25I 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 STK14C88-NF25I meets industry standards.
7.What is the process for return or replacement of STK14C88-NF25I?
All STK14C88-NF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK14C88-NF25I, 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 STK14C88-NF25I part is unused and in its original packaging.
Return procedure for STK14C88-NF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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