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Infineon Technologies STK22C48-SF25
- Part No.:
- STK22C48-SF25
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
STK22C48-SF25.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,380
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Product details
Overview
STK22C48-SF25 from Cypress Semiconductor is a 16-Kbit (2 K × 8) nonvolatile static RAM with AutoStore™ functionality, integrating SRAM and QuantumTrap™ nonvolatile storage in each cell. It operates at 5 V ±10%, delivers 25 ns access time, supports automatic STORE on power-down using an external 68 µF capacitor, and guarantees 100-year data retention. It is used in industrial control modules where persistent memory state must survive unexpected power loss without software intervention.
For engineers reviewing the STK22C48-SF25 datasheet, STK22C48-SF25 pinout, STK22C48-SF25 application, or STK22C48-SF25 equivalent, key selection considerations include AutoStore timing constraints (tHRECALL = 10 ms), HSB-controlled hardware STORE initiation, VCAP capacitor sizing (68–220 µF), and compatibility with legacy 5 V bus systems requiring guaranteed nonvolatile write persistence.
Technical Context
The STK22C48-SF25 implements a dual-cell architecture: a standard fast SRAM array (32 × 512) paired with parallel QuantumTrap nonvolatile elements. STORE transfers data from SRAM to nonvolatile cells; RECALL restores it on power-up - both operations occur atomically across all 2,048 bytes.
AutoStore is triggered when VCC drops below VSWITCH (~3.6 V), disconnecting VCAP and using its stored charge to complete a single 10 ms STORE cycle. Hardware STORE is initiated by pulling HSB low (with tDELAY delay), while RECALL is automatic on VCC rise above VSWITCH, with no software dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8): supports byte-wide addressing for direct replacement of standard 2K×8 SRAMs without bus widening. |
| Access time | 25 ns: enables integration into high-speed 5 V microcontroller buses with ≤40 MHz clock domains. |
| STORE endurance | 1,000,000 cycles: defines maximum lifetime for power-loss-triggered writes; exceeds typical field requirements for industrial logging. |
| Data retention | 100 years at +85°C: ensures firmware/state persistence over full product lifecycle without refresh or backup power. |
| VCAP capacitance | 68 µF minimum: sets minimum bulk capacitance required to sustain 10 ms STORE under worst-case VCC droop profile. |
| Operating voltage | 5 V ±10% (4.5–5.5 V): matches legacy TTL/CMOS logic rails; excludes compatibility with 3.3 V systems. |
| Temperature range | Industrial (–40°C to +85°C): validated for use in motor drives, PLC I/O modules, and outdoor metering hardware. |
Pinout & Package
STK22C48-SF25 is housed in a 28-pin 300-mil Small Outline Integrated Circuit (SOIC) package with gull-wing leads, RoHS-compliant, and rated for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address input | 11-bit address bus selecting one of 2,048 SRAM locations; compatible with standard 8051/68K-style address decoding. |
| DQ0–DQ7 | Bidirectional data I/O | 8-bit parallel data path; tri-stated when OE HIGH or during STORE/RECALL to prevent bus contention. |
| CE | Chip enable (active LOW) | Primary chip select; disables internal circuitry and reduces ICC to standby level when HIGH. |
| WE | Write enable (active LOW) | Controls SRAM write latching; must be stable before and during address/data setup per tSD/tHD timing. |
| OE | Output enable (active LOW) | Enables DQ outputs during read; must remain HIGH during write to avoid output driver conflict. |
| HSB | Hardware Store Busy | Open-drain status signal: driven LOW during STORE; also initiates STORE when externally pulled LOW (with tDELAY). |
| VCAP | AutoStore capacitor supply | Connects to external 68–220 µF capacitor; provides energy for STORE when VCC collapses below VSWITCH. |
| VCC | Power supply | +5 V ±10% main supply; powers SRAM and charges VCAP; drops below 3.6 V triggers AutoStore sequence. |
| VSS | Ground | System reference ground; requires low-impedance connection to minimize noise-induced STORE corruption. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on power-down | Eliminates need for external power-fail detection circuitry or battery-backed SRAM; triggered autonomously at VCC < 3.6 V. |
| QuantumTrap nonvolatile cell | Enables true parallel STORE/RECALL across all 2,048 bytes in 10 ms, avoiding sequential page-write delays of EEPROM/Flash. |
| HSB-initiated STORE | Allows deterministic, software-synchronized nonvolatile save points - e.g., after critical configuration update or calibration data capture. |
| Unlimited SRAM reads/writes | Preserves full SRAM performance envelope (25 ns access, no wear-out) while adding nonvolatility - unlike FRAM or MRAM with write latency penalties. |
| Hardware data protection | Automatically inhibits STORE and WRITE during brown-out (VCC < VSWITCH), preventing corruption of volatile and nonvolatile memory states. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
|
Use Scenario: A programmable logic controller records sensor timestamps and fault codes in volatile memory during runtime and must retain them across AC power interruptions. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate write-accessible storage with guaranteed persistence on power loss via AutoStore. Use Value: Eliminates supercapacitor/battery backup subsystems while ensuring sub-10 ms STORE completion - faster than flash-based logging solutions. |
Use Scenario: An infusion pump stores user-calibrated flow rates, alarm thresholds, and device serial history that must survive battery replacement or mains outage. IC Role / Device Role / Timing Role: Persistent configuration register bank with zero-software overhead recall on power-up. Use Value: Guarantees 100-year data retention without periodic refresh, meeting IEC 62304 Class C safety requirements for critical parameter storage. |
| Telecom Line Card Status Buffer | Energy Meter Firmware State Backup |
|
Use Scenario: A DSLAM line card buffers real-time line diagnostics and error counters, requiring nonvolatile capture before hot-swap or firmware reload. IC Role / Device Role / Timing Role: High-speed SRAM with hardware-triggered STORE (via HSB) synchronized to FPGA control signals. Use Value: Enables deterministic, sub-10 ms state capture without CPU involvement - critical for carrier-grade uptime SLAs. |
Use Scenario: A smart electricity meter maintains cumulative kWh, tamper flags, and tariff schedule updates across grid outages lasting hours or days. IC Role / Device Role / Timing Role: Primary nonvolatile memory for mission-critical billing and compliance data, powered solely by VCAP during blackout. Use Value: Meets ANSI C12.22 and DLMS/COSEM data integrity mandates with no reliance on external backup power sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B101PA-SP25XI | 1-Mbit nvSRAM, 25 ns access, SPI interface option, integrated VCAP switch, supports 3.3 V operation. | Targets newer designs requiring higher density and mixed-voltage compatibility; lacks pin-for-pin SOIC-28 footprint. | Select when migrating from STK22C48-SF25 to higher capacity or 3.3 V systems; requires PCB redesign and firmware SPI adaptation. |
| FM24CL16B | 16-Kbit F-RAM, 3.3 V only, unlimited endurance, no VCAP capacitor needed, 100 ns access time. | Suitable for low-power, high-write-cycle applications but slower than STK22C48-SF25 and incompatible with 5 V buses. | Choose for battery-powered devices needing infinite write cycles and minimal external components - not for 5 V industrial backplanes. |
Compared with CY14B101PA-SP25XI and FM24CL16B, STK22C48-SF25 uniquely balances 5 V compatibility, 25 ns speed, and proven AutoStore reliability in legacy infrastructure - making it irreplaceable in field-deployed equipment where board-level changes are cost-prohibitive.
Availability
STK22C48-SF25 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, telecom line cards, and smart energy meters requiring stable component supply and long-term obsolescence support.
Supply support for STK22C48-SF25 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 STK22C48 belongs to Cypress's nvSRAM product line, designed specifically to replace battery-backed SRAM and EEPROM in systems demanding instant nonvolatility, high write endurance, and seamless 5 V integration.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The STK22C48-SF25 requires a minimum 68 µF tantalum or aluminum electrolytic capacitor on the VCAP pin, rated ≥6 V and ±20% tolerance. This value ensures sufficient energy to complete the 10 ms STORE cycle even under worst-case VCC droop profiles and temperature extremes. Using less capacitance risks incomplete STORE and data loss.
Can STK22C48-SF25 operate without the VCAP capacitor?
No - the VCAP capacitor is mandatory for AutoStore functionality. In AutoStore Inhibit mode (VCC grounded, +5 V applied to VCAP), the capacitor is still required to source current during HSB-initiated STORE. Omitting VCAP disables all nonvolatile STORE operations, reducing the device to standard SRAM behavior with no persistence.
How does the STK22C48-SF25 handle simultaneous SRAM access and STORE initiation?
When HSB is pulled LOW or VCC drops below VSWITCH, ongoing SRAM Read/Write cycles are allowed to complete within tDELAY (typically 200 ns), then all accesses are halted. STORE begins only after completion - preventing partial writes or corrupted data transfer between SRAM and QuantumTrap cells.
Is STK22C48-SF25 suitable for new designs?
Cypress explicitly labels STK22C48 as "Not Recommended for New Designs" - it remains in production solely to support existing industrial and medical programs. For new projects, Infineon recommends CY14B101PA-SP25XI or FM24CL16B depending on voltage, density, and interface needs, with full migration support available.
STK22C48-SF25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K 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
STK22C48-SF25 FAQ
1.How can I place an order for STK22C48-SF25 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-SF25 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 STK22C48-SF25 reliable?
The price and inventory of STK22C48-SF25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-SF25 is usually 5 days.
3.What payment methods are accepted for STK22C48-SF25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-SF25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-SF25?
STK22C48-SF25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-SF25 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 STK22C48-SF25?
For technical support, including STK22C48-SF25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-SF25 requirements.
6.How does Aetrix verify that STK22C48-SF25 is sourced from the original manufacturer or authorized distributors?
All STK22C48-SF25 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 STK22C48-SF25 meets industry standards.
7.What is the process for return or replacement of STK22C48-SF25?
All STK22C48-SF25 units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-SF25, 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 STK22C48-SF25 part is unused and in its original packaging.
Return procedure for STK22C48-SF25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK22C48-SF25 Tags
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