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Infineon Technologies STK22C48-NF25
- Part No.:
- STK22C48-NF25
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK22C48-NF25.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,322
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Product details
Overview
STK22C48-NF25 from Cypress Semiconductor is a 16-Kbit (2 K × 8) nonvolatile SRAM with AutoStore™ functionality, integrating QuantumTrap™ nonvolatile storage per cell. It operates at 5 V ±10%, delivers 25 ns access time, supports hardware STORE via HSB pin, and retains data for 100 years. Used in industrial control modules where power-loss resilience and byte-level SRAM compatibility are critical.
For engineers reviewing the STK22C48-NF25 datasheet, STK22C48-NF25 pinout, STK22C48-NF25 application, or STK22C48-NF25 equivalent, key selection criteria include AutoStore capacitor sizing (68 µF), HSB-driven STORE timing (tDELAY), VCAP voltage hold-up during power-down, and compatibility with legacy 28-pin SOIC-based memory interfaces.
Technical Context
The STK22C48-NF25 combines a standard fast SRAM array (32 × 512) with parallel QuantumTrap™ nonvolatile cells-enabling simultaneous STORE/RECALL across all 2,048 bytes. Its dual-mode operation supports both automatic power-loss-triggered STORE (via VCAP discharge) and explicit hardware STORE (via HSB assertion).
STORE is conditionally initiated only after at least one SRAM write since last STORE or RECALL; RECALL occurs automatically on power-up when VCC exceeds VSWITCH. The device inhibits writes and STOREs under low-voltage conditions (VCC < VSWITCH) and uses internal pull-up on HSB to signal busy status during nonvolatile operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8); provides byte-addressable SRAM interface compatible with legacy microcontroller bus cycles. |
| Access time | 25 ns; enables direct replacement of standard 25 ns SRAMs without timing redesign. |
| Nonvolatile endurance | 1,000,000 STORE cycles; defines maximum number of power-loss-initiated or HSB-triggered nonvolatile writes. |
| Data retention | 100 years at +25°C; guaranteed retention period for stored data in QuantumTrap cells without refresh. |
| Operating voltage | 5 V ±10% (4.5 V–5.5 V); single-supply operation compatible with TTL/CMOS logic families. |
| VCAP capacitor | 68 µF minimum; external capacitor supplies energy for full STORE cycle during VCC collapse. |
| Temperature range | Industrial: –40°C to +85°C; validated for use in programmable logic controllers and motor drives. |
Pinout & Package
STK22C48-NF25 is housed in a 28-pin 300-mil Small Outline Integrated Circuit (SOIC) package with gull-wing leads and RoHS-compliant finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address input | 11-bit address bus selecting one of 2,048 SRAM locations; latched on CE/WE transitions. |
| DQ0–DQ7 | Bidirectional data I/O | 8-bit parallel data path; tri-stated when OE = HIGH or during STORE/RECALL. |
| WE | Write enable (active LOW) | Controls SRAM write initiation; must be stable before and during write cycle. |
| CE | Chip enable (active LOW) | Selects device for read/write; disables outputs and reduces standby current when HIGH. |
| OE | Output enable (active LOW) | Enables DQ outputs during reads; must remain HIGH during writes to avoid bus contention. |
| HSB | Hardware Store Busy | Open-drain output signaling STORE progress; also accepts LOW pulse to initiate hardware STORE. |
| VCAP | AutoStore capacitor supply | Connects to external 68 µF capacitor; powers internal STORE circuitry when VCC drops below VSWITCH. |
| VCC | Primary power supply | +5 V ±10% main supply; powers SRAM core and logic; disconnected from VCAP during power loss. |
| VSS | Ground reference | System ground return; requires low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore™ on power-down | Eliminates need for external backup battery or supercapacitor management circuitry; triggered autonomously when VCC falls below VSWITCH. |
| QuantumTrap™ nonvolatile cell | Embedded per-cell nonvolatility enables bit-level reliability and eliminates block erase limitations found in Flash/NOR. |
| Conditional STORE enforcement | Prevents spurious STOREs by requiring at least one SRAM write since last STORE or RECALL-reducing unnecessary wear. |
| Hardware STORE via HSB | Allows deterministic, software-synchronized nonvolatile save points independent of power rail behavior. |
| Low-voltage write inhibition | Blocks SRAM writes and STOREs when VCC < VSWITCH, preventing corruption during brown-out or ramp-up conditions. |
Applications
| Industrial PLC Data Logging | Medical Device Parameter Storage |
|---|---|
|
Use Scenario: Storing real-time sensor calibration values and operational history in a programmable logic controller during unexpected AC mains failure. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate SRAM-like access with guaranteed post-failure data persistence. Use Value: Eliminates need for external EEPROM write sequencing and avoids 5–10 ms Flash programming delays during power loss. |
Use Scenario: Retaining patient-specific therapy settings and alarm thresholds in portable infusion pumps between battery swaps. IC Role / Device Role / Timing Role: Byte-addressable memory with zero-delay recall on power-up and deterministic STORE on battery disconnect. Use Value: Ensures therapy continuity without firmware intervention; supports >1M STORE cycles over product lifetime. |
| Automotive Body Control Module | Test Equipment Configuration Memory |
|
Use Scenario: Preserving door lock state, mirror position, and lighting preferences in vehicle body control units during ignition cycling. IC Role / Device Role / Timing Role: Drop-in SRAM replacement with integrated nonvolatility; operates across automotive temperature range. Use Value: Reduces BOM count by replacing SRAM + external NV backup; meets AEC-Q100 Class 2 thermal requirements. |
Use Scenario: Holding instrument calibration coefficients and user-defined test sequences in automated benchtop testers subject to frequent power cycling. IC Role / Device Role / Timing Role: High-reliability memory enabling instant restore of configuration without boot-time EEPROM polling. Use Value: Cuts test setup time by eliminating NV initialization delays; supports unlimited RECALL cycles for rapid reconfiguration. |
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; requires external STORE capacitor but lacks HSB pin. | Higher density, lower pin count (16-pin SOIC), no parallel bus support; suited for space-constrained MCU designs with SPI peripherals. | Select when migrating to higher density or when SPI interface simplifies layout; verify VCAP timing compliance with new layout parasitics. |
| FM24CL64B | 64-Kbit F-RAM, I²C interface, 150 ns random access, no STORE capacitor required. | Serial interface only; no parallel bus compatibility; unlimited endurance but slower than STK22C48's 25 ns SRAM access. | Choose for ultra-low-power systems needing true byte-write endurance without STORE timing constraints; not suitable for existing parallel-bus designs. |
Compared with CY14B101PA-SP25XI and FM24CL64B, STK22C48-NF25 uniquely preserves legacy 28-pin parallel SRAM footprint and timing while delivering deterministic AutoStore with hardware control-making it irreplaceable in field-deployed industrial hardware requiring drop-in reliability upgrades.
Availability
STK22C48-NF25 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion devices, and automotive body control modules requiring stable component supply and long-term obsolescence support.
Supply support for STK22C48-NF25 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) designs high-reliability memory and programmable solutions for industrial, automotive, and communications systems.
The STK22C48 belongs to Cypress's nvSRAM product line, engineered specifically to replace battery-backed SRAM in mission-critical systems where data integrity during power interruption is non-negotiable.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The STK22C48-NF25 requires a minimum 68 µF tantalum or polymer capacitor on the VCAP pin, rated for 6 V and ±20% tolerance. This value ensures sufficient charge to complete the full 10 ms STORE cycle when VCC drops below VSWITCH (typically 3.6 V). Using less capacitance risks incomplete STORE and data loss; values up to 220 µF are acceptable for extended hold-up time.
Can STK22C48-NF25 be used without the VCAP capacitor?
No-VCAP is mandatory for AutoStore functionality. In AutoStore Inhibit mode (VCC grounded, +5 V applied to VCAP), the capacitor is still required to power the STORE operation when triggered by HSB. Omitting VCAP disables all nonvolatile STORE capability; the device functions only as volatile SRAM with no data retention on power loss.
How does the STK22C48-NF25 prevent unintended STORE during brown-out conditions?
The device monitors VCC continuously and inhibits all STORE operations-including AutoStore and HSB-initiated-when VCC falls below VSWITCH (~3.6 V). Additionally, it blocks SRAM writes during low-voltage periods and requires at least one valid write since the last STORE or RECALL before allowing a new STORE, preventing spurious triggers during unstable power rails.
Is STK22C48-NF25 pin-compatible with standard 28-pin SRAMs like the AS6C4008?
Yes-STK22C48-NF25 uses identical 28-pin SOIC pinout and electrical timing for SRAM read/write operations. However, VCAP and HSB pins are additional functional terminals not present on standard SRAMs; these must be properly terminated (VCAP with capacitor, HSB pulled up if unused) to ensure compatibility and avoid conflicts in existing layouts.
STK22C48-NF25 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-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:
- 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-NF25 FAQ
1.How can I place an order for STK22C48-NF25 through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-NF25 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-NF25 reliable?
The price and inventory of STK22C48-NF25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-NF25 is usually 5 days.
3.What payment methods are accepted for STK22C48-NF25?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-NF25 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-NF25?
STK22C48-NF25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-NF25 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-NF25?
For technical support, including STK22C48-NF25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-NF25 requirements.
6.How does Aetrix verify that STK22C48-NF25 is sourced from the original manufacturer or authorized distributors?
All STK22C48-NF25 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-NF25 meets industry standards.
7.What is the process for return or replacement of STK22C48-NF25?
All STK22C48-NF25 units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-NF25, 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-NF25 part is unused and in its original packaging.
Return procedure for STK22C48-NF25:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STK22C48-NF25 Tags
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