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Infineon Technologies STK15C88-NF45TR
- Part No.:
- STK15C88-NF45TR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK15C88-NF45TR.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,648
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Product details
Overview
STK15C88-NF45TR from Cypress Semiconductor (now Infineon) is a 8-Kbit (1K × 8) non-volatile static RAM (nvSRAM) with automatic data retention on power loss, integrated lithium battery backup, and 45 ns access time. It operates at 5 V, supports industrial temperature range (–40°C to +85°C), and retains data for 10 years without external power. It is used in metering, industrial PLCs, and network equipment requiring instant-on, fail-safe memory.
For engineers reviewing the STK15C88-NF45TR datasheet, STK15C88-NF45TR pinout, STK15C88-NF45TR application, or STK15C88-NF45TR equivalent, key selection criteria include nvSRAM architecture, battery-backed write-cycle endurance, 45 ns read timing, industrial-grade reliability, and compatibility with legacy SRAM interfaces.
Technical Context
This nvSRAM integrates a standard asynchronous SRAM core with an on-chip controller and embedded lithium battery to automatically store data to non-volatile elements during power failure. The device uses capacitor-assisted store/restore and requires no external hardware or firmware intervention.
It features TTL-compatible inputs, three-state outputs, and supports byte-wide parallel access. The internal store operation triggers when VCC drops below VPOR (typically 3.0 V), and restore occurs on power-up when VCC exceeds VPU (typically 3.3 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 8 Kbit (1K × 8) - supports byte-level random access without refresh or external management |
| Access time | 45 ns - enables direct replacement of fast SRAM in legacy 5 V systems |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails and eliminates need for voltage translation |
| Data retention | 10 years minimum - guaranteed retention without external power, enabled by integrated Li battery |
| Operating temperature | –40°C to +85°C - qualified for industrial environments including factory automation and energy metering |
| Write endurance | 200,000 store cycles - defines maximum number of power-loss events before non-volatile element wear-out |
| Package | SOIC-28 (300 mil) - surface-mount footprint matching industry-standard 28-pin SRAM layouts |
Pinout & Package
STK15C88-NF45TR is housed in a 28-pin SOIC (300 mil) package with gull-wing leads and standard JEDEC MS-013AC dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A9 | Address inputs | 10-bit address bus supporting 1K-word addressing; TTL-compatible thresholds |
| IO0–IO7 | Bi-directional data I/O | 8-bit parallel data path; high-impedance when chip disabled or during store/restore |
| CE# | Chip enable | Active-low control enabling memory access; must be low for read/write/store initiation |
| OE# | Output enable | Active-low control gating output drivers; allows bus sharing in multi-device systems |
| WE# | Write enable | Active-low signal controlling write vs. read mode; initiates store on falling edge during power loss |
| VCC | Power supply | 5 V main supply; powers SRAM core and control logic; drop below 3.0 V triggers auto-store |
| VCAP | Capacitor connection | External capacitor (10 µF typical) provides hold-up energy for store operation during brownout |
Key Features
| Feature | Design Value |
|---|---|
| Automatic store/restore | Zero-firmware, hardware-triggered data transfer between SRAM and NV elements on power loss/recovery |
| Embedded lithium battery | On-die primary Li cell eliminates external battery management and PCB space overhead |
| TTL-compatible interface | Direct drop-in replacement for standard 5 V SRAMs without level-shifting or timing redesign |
| Industrial temperature grade | Validated operation across –40°C to +85°C ensures reliability in uncontrolled environments |
| No external write cycle limit | Unlimited SRAM read/write cycles; only store operations (max 200k) affect endurance |
Applications
| Smart Energy Metering | Industrial PLC Data Logging |
|---|---|
Use Scenario: Real-time accumulation of kWh, demand, and tariff data in electricity meters subject to frequent grid interruptions. IC Role / Device Role / Timing Role: Non-volatile storage for critical billing registers and event logs; retains data during meter power-down or battery swap. Use Value: Ensures regulatory compliance with ANSI C12.20 and IEC 62053 by preserving tamper-proof usage history without external NV memory or backup controllers. | Use Scenario: Storing operational states, fault codes, and configuration parameters in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Fail-safe memory for ladder logic state variables and I/O mapping; restores last known good state after unexpected power loss. Use Value: Eliminates need for external EEPROM or flash with wear leveling, reducing BOM count and startup latency during cold boot. |
| Telecom Network Equipment | Point-of-Sale Terminal Memory |
Use Scenario: Preserving session keys, routing tables, and port status in DSLAMs and ONU devices experiencing brownouts or scheduled maintenance shutdowns. IC Role / Device Role / Timing Role: Secure, fast-access memory for cryptographic context and configuration snapshots; stores within 45 ns window before VCC collapse. Use Value: Prevents service disruption and re-authentication delays by maintaining secure state across power cycles without software intervention. | Use Scenario: Holding transaction buffers, tax tables, and user preferences in retail terminals where AC power may be interrupted during peak hours. IC Role / Device Role / Timing Role: Battery-backed SRAM for volatile transaction cache; guarantees atomic commit of sales records even during sudden power failure. Use Value: Meets PCI PTS v6.0 requirements for data integrity by ensuring no partial or corrupted financial records are written to persistent storage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nvSRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK15C88-NF55TR | 55 ns access time; otherwise identical architecture, pinout, and retention spec | Suitable where system timing budget allows slower access; lower cost variant | Select when 55 ns meets setup/hold margins and cost optimization is prioritized over speed |
| FM1808-55-TG | F-RAM-based 8-Kbit non-volatile RAM; unlimited endurance; 55 ns access; 3.3 V only | Requires 3.3 V rail and lacks integrated battery; needs external capacitor for store | Choose for high-write-cycle applications where F-RAM's 1014 endurance outweighs lack of self-contained backup |
Compared with STK15C88-NF55TR and FM1808-55-TG, the STK15C88-NF45TR offers the fastest access (45 ns) and fully integrated power-loss protection, making it optimal for time-critical industrial systems where both speed and autonomous data retention are mandatory.
Availability
STK15C88-NF45TR is available at Aetrix Electronics and suitable for smart metering, industrial PLCs, telecom infrastructure, and point-of-sale terminals requiring stable component supply and long-term lifecycle support.
Supply support for STK15C88-NF45TR 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
Infineon Technologies acquired Cypress Semiconductor in 2020, integrating its nvSRAM, F-RAM, and timing portfolio into a broad industrial and automotive memory solutions offering.
The STK15C88-NF45TR belongs to Cypress' legacy nvSRAM product line, designed specifically for applications demanding instantaneous, firmware-free non-volatility in 5 V systems with strict timing and reliability requirements.
FAQ
What is the role of the VCAP pin on STK15C88-NF45TR?
The VCAP pin connects to an external 10 µF tantalum or ceramic capacitor that supplies transient energy during the store operation when VCC collapses. This capacitor ensures sufficient voltage headroom and current delivery to complete the SRAM-to-nonvolatile transfer before power drops below the controller's functional threshold.
Does STK15C88-NF45TR require any initialization or configuration before use?
No. STK15C88-NF45TR is a drop-in replacement for standard 5 V SRAMs and requires no initialization sequence, register programming, or firmware support. Store and restore operations are fully autonomous and triggered solely by VCC monitoring circuitry.
Can STK15C88-NF45TR be used in a 3.3 V system?
No. The device is specified only for 5 V ±10% operation. Its input thresholds, internal regulator, and battery charging circuit are designed exclusively for 5 V rails. Using it at 3.3 V will result in undefined behavior, failed store/restore, and potential data corruption.
How does the integrated lithium battery affect shelf life and RoHS compliance?
The embedded lithium battery is sealed, hermetically packaged, and exempt under RoHS Annex III for permanent incorporation in electronic memory devices. Shelf life exceeds 10 years when stored at ≤30°C and 60% RH; battery self-discharge is factored into the 10-year data retention guarantee.
STK15C88-NF45TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 45ns
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK15C88-NF45TR FAQ
1.How can I place an order for STK15C88-NF45TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK15C88-NF45TR 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 STK15C88-NF45TR reliable?
The price and inventory of STK15C88-NF45TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK15C88-NF45TR is usually 5 days.
3.What payment methods are accepted for STK15C88-NF45TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK15C88-NF45TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK15C88-NF45TR?
STK15C88-NF45TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK15C88-NF45TR 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 STK15C88-NF45TR?
For technical support, including STK15C88-NF45TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK15C88-NF45TR requirements.
6.How does Aetrix verify that STK15C88-NF45TR is sourced from the original manufacturer or authorized distributors?
All STK15C88-NF45TR 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 STK15C88-NF45TR meets industry standards.
7.What is the process for return or replacement of STK15C88-NF45TR?
All STK15C88-NF45TR units undergo pre-shipment inspection (PSI). If there is an issue with STK15C88-NF45TR, 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 STK15C88-NF45TR part is unused and in its original packaging.
Return procedure for STK15C88-NF45TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK15C88-NF45TR Tags
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