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Infineon Technologies STK11C88-NF25TR
- Part No.:
- STK11C88-NF25TR
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK11C88-NF25TR.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,428
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Product details
Overview
STK11C88-NF25TR from Cypress Semiconductor is a 256 Kbit (32K × 8) nonvolatile static RAM with QuantumTrap nvSRAM technology, delivering 25 ns access time, automatic hardware RECALL on power-up, and software-initiated STORE/RECALL. It operates from a single 5V ±10% supply, supports commercial and industrial temperature ranges, and resides in a 28-pin SOIC package - used in real-time data logging, battery-free configuration storage, and industrial controller state retention.
For engineers reviewing the STK11C88-NF25TR datasheet, STK11C88-NF25TR pinout, STK11C88-NF25TR application, or STK11C88-NF25TR equivalent, key selection criteria include tAA = 25 ns SRAM read timing, unlimited SRAM write endurance, 1,000,000 STORE cycles, 100-year data retention, and compatibility with standard 32K × 8 SRAM footprints in legacy control systems.
Technical Context
The STK11C88-NF25TR integrates volatile SRAM and nonvolatile QuantumTrap memory cells in a unified 32K × 8 array, enabling atomic STORE (SRAM → NV) and RECALL (NV → SRAM) operations without external capacitors or backup batteries. Its dual-mode operation preserves data integrity during unexpected power loss while maintaining full SRAM interface compatibility.
STORE is initiated via a precise six-address CE-controlled READ sequence (0x0E38 → 0x0FC0); RECALL uses an identical sequence ending at 0x0C63. Hardware RECALL triggers automatically when VCC rises above VSWITCH after brownout, completing in tHRECALL ≤ 20 ms - critical for deterministic boot-state restoration in programmable logic controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 256 Kbit (32K × 8) - provides byte-wide addressing for microcontroller-based systems requiring fast, persistent register banks. |
| Access Time (tAA) | 25 ns - enables direct interfacing with 40 MHz bus clocks without wait states in legacy industrial MCUs. |
| Data Retention | 100 years at +85°C - guarantees firmware configuration persistence across product lifecycles without refresh or supervision. |
| STORE Endurance | 1,000,000 cycles - supports daily firmware update logging in field-deployed telemetry gateways. |
| Power Supply | Single 4.5V–5.5V supply - eliminates need for auxiliary voltage rails or charge pumps in 5V-only embedded designs. |
| Operating Temp | –40°C to +85°C - qualified for use in uncontrolled industrial enclosures and outdoor metering hardware. |
| Package | 28-pin SOIC (300 mil) - drop-in replacement for industry-standard 32K × 8 SRAMs in existing PCB layouts. |
Pinout & Package
STK11C88-NF25TR is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package with 300 mil body width and standard 1.27 mm pitch. Pin functions are fully compatible with JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Input | 15-bit address bus supporting full 32K-byte addressing; stable before WE/CE assertion for reliable write setup. |
| DQ0–DQ7 | Bidirectional Data I/O | 8-bit parallel data path; tristates when OE = HIGH or during STORE/RECALL to prevent bus contention. |
| WE | Write Enable (Active LOW) | Controls SRAM write initiation; must remain HIGH during software STORE/RECALL sequences to avoid abort. |
| CE | Chip Enable (Active LOW) | Primary device select; used to clock all six-address STORE/RECALL sequences in CE-controlled READ mode. |
| OE | Output Enable (Active LOW) | Enables SRAM output drivers during reads; kept HIGH during writes to isolate data bus. |
| VCC | Power Supply | 5V ±10% input; requires local 0.1 µF ceramic bypass capacitor between VCC and VSS for noise immunity. |
| VSS | Ground | System ground reference; must be low-impedance connection to minimize switching noise coupling into nv cell programming. |
Key Features
| Feature | Design Value |
|---|---|
| QuantumTrap nv Cell Technology | Embedded nonvolatile element per SRAM cell enables true byte-level STORE/RECALL without block erasure or wear leveling overhead. |
| Automatic Power-Up RECALL | Hardware-triggered restoration of last valid SRAM image within ≤20 ms of VCC crossing VSWITCH - ensures deterministic boot state without firmware intervention. |
| Software STORE/RECALL Sequence | Six-address CE-controlled READ protocol (no special voltage pulses or timing windows) simplifies integration into existing memory-mapped MCU firmware. |
| Hardware Write/STORE Inhibit | Automatic disable of WE and STORE when VCC < VSWITCH prevents corruption during brownout - no external supervisor IC required. |
| Unlimited SRAM Endurance | Standard CMOS SRAM core supports infinite read/write cycles - ideal for high-frequency register shadowing in motion control applications. |
Applications
| Industrial PLC Configuration Storage | Point-of-Sale Terminal Transaction Logging |
|---|---|
|
Use Scenario: Retaining I/O mapping, ladder logic parameters, and calibration offsets across unplanned power cycles in factory-floor PLCs. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate post-power-up register availability with zero boot delay. Use Value: Eliminates need for battery-backed RAM modules and associated maintenance, reducing BOM cost and field failure risk. |
Use Scenario: Capturing last completed transaction ID, tax rate tables, and receipt buffer state before AC power loss in retail terminals. IC Role / Device Role / Timing Role: Atomic STORE triggered by MCU watchdog timeout or voltage monitor interrupt prior to shutdown. Use Value: Guarantees transaction atomicity and audit trail continuity without reliance on EEPROM write latency or flash endurance limits. |
| Metering Data Buffering | Medical Device Calibration Storage |
|
Use Scenario: Holding accumulated kWh/kvar readings and time-stamped event logs in smart electricity meters during grid outages. IC Role / Device Role / Timing Role: High-reliability nvSRAM with 100-year retention serving as primary energy-data vault. Use Value: Meets ANSI C12.20 and IEC 62053-21 requirements for tamper-resistant, long-term metrology data preservation. |
Use Scenario: Storing sensor offset/gain coefficients, user-adjusted therapy parameters, and usage history in portable infusion pumps. IC Role / Device Role / Timing Role: Secure, nonvolatile configuration store accessible via standard memory-mapped reads/writes. Use Value: Ensures FDA 21 CFR Part 11 compliance through deterministic recall of calibrated settings after every power cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STK11C68-NF25TR | 128 Kbit (16K × 8), same 25 ns access, identical pinout and command set | Lower density suitable for simpler controllers with smaller configuration footprints | Select when system firmware requires ≤16K bytes of nonvolatile parameter storage and board space is constrained. |
| FM24CL64-G | F-RAM-based, 64 Kbit, I²C interface, 10¹⁴ read/write endurance, no STORE/RECALL latency | Serial interface replaces parallel bus; eliminates address/data multiplexing but adds protocol overhead | Choose for new designs prioritizing ultra-high endurance and simplified routing over SRAM compatibility and speed. |
Compared with STK11C88-NF25TR, the STK11C68-NF25TR reduces capacity while preserving identical timing and interface behavior, whereas the FM24CL64-G trades parallel simplicity for serial flexibility and eliminates STORE latency - making it better suited for low-pin-count, low-power IoT nodes rather than legacy 5V industrial controllers.
Availability
STK11C88-NF25TR is available at Aetrix Electronics and suitable for industrial PLCs, smart metering hardware, medical infusion devices, and point-of-sale terminals requiring stable component supply and long-term obsolescence support.
Supply support for STK11C88-NF25TR 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 applications.
The STK11C88 belongs to Cypress's SoftStore nvSRAM product line, engineered specifically to replace battery-backed SRAM in mission-critical systems where reliability, zero-maintenance operation, and seamless SRAM compatibility are mandatory.
FAQ
Does STK11C88-NF25TR require an external capacitor for nonvolatile operation?
No. Unlike battery-backed SRAM, the STK11C88-NF25TR uses integrated QuantumTrap nonvolatile cells and requires no external capacitor or battery. It performs STORE using internal charge pumps powered solely from VCC, and RECALL draws only standby current during restoration - eliminating maintenance points and leakage risks.
Can STK11C88-NF25TR be used as a direct replacement for standard 32K × 8 SRAMs?
Yes - it is pin-compatible and functionally transparent during normal SRAM read/write operations. CE, WE, OE, address, and data pins match JEDEC-standard 28-pin SOIC SRAMs. STORE/RECALL commands are inactive unless the exact six-address software sequence is executed, ensuring zero impact on legacy firmware.
What happens if power fails during a STORE operation?
The STK11C88-NF25TR guarantees atomic STORE completion: if VCC drops below VSWITCH during STORE, the operation aborts cleanly and leaves both SRAM and nonvolatile memory unchanged. No partial writes or corrupted NV data occur - verified by Cypress's internal STORE abort detection circuitry.
Is STK11C88-NF25TR still recommended for new designs?
No - Cypress explicitly marks it "Not recommended for new designs" due to end-of-life planning. However, it remains in active production to support ongoing manufacturing programs, with guaranteed supply and lifecycle coordination available through Aetrix Electronics for legacy system sustainment.
STK11C88-NF25TR 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:
- 25ns
- Access Time:
- 25 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
STK11C88-NF25TR FAQ
1.How can I place an order for STK11C88-NF25TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STK11C88-NF25TR 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 STK11C88-NF25TR reliable?
The price and inventory of STK11C88-NF25TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK11C88-NF25TR is usually 5 days.
3.What payment methods are accepted for STK11C88-NF25TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK11C88-NF25TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK11C88-NF25TR?
STK11C88-NF25TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK11C88-NF25TR 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 STK11C88-NF25TR?
For technical support, including STK11C88-NF25TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK11C88-NF25TR requirements.
6.How does Aetrix verify that STK11C88-NF25TR is sourced from the original manufacturer or authorized distributors?
All STK11C88-NF25TR 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 STK11C88-NF25TR meets industry standards.
7.What is the process for return or replacement of STK11C88-NF25TR?
All STK11C88-NF25TR units undergo pre-shipment inspection (PSI). If there is an issue with STK11C88-NF25TR, 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 STK11C88-NF25TR part is unused and in its original packaging.
Return procedure for STK11C88-NF25TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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