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Infineon Technologies STK22C48-NF45I
- Part No.:
- STK22C48-NF45I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK22C48-NF45I.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,572
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Product details
Overview
STK22C48-NF45I from Cypress Semiconductor is a 16-Kbit (2 K × 8) nonvolatile SRAM with AutoStore™ functionality, integrating QuantumTrap™ nonvolatile elements in each memory cell. It operates at 5 V ±10%, delivers 45 ns access time, supports unlimited SRAM read/write cycles, and guarantees 1,000,000 STORE cycles and 100-year data retention - deployed in industrial control modules requiring persistent state storage during uncontrolled power loss.
For engineers reviewing the STK22C48-NF45I datasheet, STK22C48-NF45I pinout, STK22C48-NF45I application, or STK22C48-NF45I equivalent, key selection criteria include AutoStore timing behavior, VCAP capacitor sizing (68 µF), HSB-driven hardware STORE control, and compatibility with 28-pin SOIC footprint in legacy 5 V systems.
Technical Context
The STK22C48-NF45I combines a standard fast SRAM array (32 × 512) with parallel QuantumTrap nonvolatile cells, enabling simultaneous STORE/RECALL of all 2,048 bytes. STORE is triggered automatically on VCC drop below VSWITCH (typ. 3.6 V), via HSB assertion, or by software sequence; RECALL occurs on power-up or when VCC exceeds VSWITCH.
It uses a dedicated VCAP pin to source energy for STORE operations, requiring an external 68–220 µF capacitor. During STORE or RECALL, SRAM access is inhibited, and HSB functions as open-drain busy indicator with internal pull-up - supporting system-level coordination without polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8); supports byte-wide interface with full addressability across 2,048 locations. |
| Access time | 45 ns; defines maximum clock-to-data delay for read cycles under 5 V operation. |
| STORE endurance | 1,000,000 cycles; limits total nonvolatile write events before QuantumTrap wear-out. |
| Data retention | 100 years at +85°C; ensures data integrity in industrial environments without refresh. |
| Operating voltage | 5 V ±10% (4.5–5.5 V); requires stable 5 V rail and bypass capacitor (0.1 µF) between VCC and VSS. |
| VCAP capacitor | 68 µF minimum; supplies energy for single STORE operation during power failure. |
| Temperature range | –40°C to +85°C; qualified for industrial-grade embedded applications with thermal cycling. |
Pinout & Package
STK22C48-NF45I 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 memory 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 control; initiates SRAM write when CE = LOW and HSB = HIGH. |
| CE | Chip enable | Active-low chip select; disables device and reduces standby current when HIGH. |
| OE | Output enable | Active-low output control; enables DQ drivers during read; must be HIGH during write. |
| HSB | Hardware Store Busy | Open-drain status/output; driven LOW during STORE; pulled LOW externally to initiate hardware STORE. |
| VCAP | AutoStore capacitor supply | Connects to external 68 µF capacitor; powers STORE operation when VCC fails. |
| VCC | Power supply | +5 V ±10% main supply; powers SRAM and logic; disconnects from VCAP at VSWITCH (~3.6 V). |
| VSS | Ground | System reference ground; required for noise immunity and proper SRAM operation. |
| NC | No connect | Pins 27 and 28 are internally unconnected; must remain floating or grounded per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore™ on power-down | Hands-off STORE activation using VCAP-supplied energy eliminates firmware dependency for critical state save. |
| QuantumTrap™ nonvolatile cell | Embedded per-cell nonvolatility enables full-array parallel STORE/RECALL without block erasure delays. |
| HSB pin control & status | Single-pin dual function: request hardware STORE and monitor progress without polling or interrupts. |
| Unlimited SRAM read/write cycles | Standard SRAM interface behavior allows continuous logging, buffering, or configuration updates without wear concern. |
| Hardware data protection | Automatic inhibition of STORE and write during brown-out (VCC < VSWITCH) prevents corruption. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
Use Scenario: Retaining real-time sensor history and operational parameters during unexpected AC mains loss in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate, deterministic STORE on power collapse without CPU intervention. Use Value: Eliminates need for backup batteries or supercapacitor management circuits while ensuring sub-10 ms state capture. | Use Scenario: Preserving calibration coefficients, user preferences, and last-known vital sign thresholds in portable ECG monitors. IC Role / Device Role / Timing Role: Persistent memory element retaining critical settings across cold starts and battery swaps. Use Value: Meets IEC 62304 Class C software requirements for data integrity without external NVM firmware overhead. |
| Avionics Power-Up State Recovery | Energy Meter Firmware Parameter Backup |
Use Scenario: Restoring flight control initialization vectors and sensor bias offsets after aircraft electrical reset sequences. IC Role / Device Role / Timing Role: RECALL-triggered SRAM reload at power-up ensures deterministic boot state within tHRECALL (max 15 ms). Use Value: Avoids reliance on slow serial EEPROM reads, reducing boot latency in DO-254-certified subsystems. | Use Scenario: Safeguarding tariff schedules, metering constants, and tamper-event logs in ANSI C12.20-compliant smart meters. IC Role / Device Role / Timing Role: High-reliability nvSRAM storing billing-critical data immune to power glitches during grid transients. Use Value: Guarantees 100-year retention at 85°C ambient, exceeding ANSI/IEEE lifetime validation requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B104Q-SXI | 4-Mbit density, SPI interface, 3.3 V only, integrated capacitor support; no HSB pin. | Requires SPI host controller; lacks parallel byte interface and hardware STORE signaling. | Select when migrating to smaller footprint and lower voltage, and when firmware-controlled STORE suffices. |
| FM24CL64-G | 64-Kbit F-RAM, I²C interface, 2.7–3.6 V, unlimited endurance, no VCAP capacitor needed. | Serial interface increases latency; incompatible with parallel bus architectures and AutoStore timing model. | Choose for ultra-high write-cycle applications where deterministic STORE timing is secondary to endurance. |
Compared with CY14B104Q-SXI and FM24CL64-G, STK22C48-NF45I uniquely provides parallel 5 V operation, hardware-managed STORE/RECALL with HSB signaling, and proven 100-year retention - making it irreplaceable in legacy industrial designs requiring zero-firmware power-loss response.
Availability
STK22C48-NF45I is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic equipment, and avionics subsystems requiring stable component supply and long-term obsolescence support.
Supply support for STK22C48-NF45I 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 markets.
The STK22C48 belongs to Cypress's nvSRAM product line, engineered specifically for systems needing instant, deterministic nonvolatile storage without battery backup or complex firmware coordination.
FAQ
What is the minimum VCAP capacitance required for reliable AutoStore operation?
The STK22C48-NF45I requires a minimum 68 µF tantalum or low-ESR electrolytic capacitor on the VCAP pin to guarantee successful STORE during worst-case 10 ms power collapse. Capacitance below this value risks incomplete STORE due to insufficient stored energy, especially at elevated temperatures or end-of-life capacitor degradation.
Can STK22C48-NF45I operate without the VCAP capacitor?
Yes - in AutoStore Inhibit mode, where VCC is tied to ground and +5 V is applied directly to VCAP. In this configuration, AutoStore is disabled and STORE is initiated only via HSB assertion or software command. However, this mode forfeits hands-off power-loss protection and requires active system control.
How does the HSB pin behave during a STORE cycle initiated by power-down?
During AutoStore triggered by VCC falling below VSWITCH, the HSB pin is actively driven LOW by the device to signal STORE progress. It remains LOW for the full duration of the STORE operation (≤10 ms), then releases to HIGH only after completion - enabling external logic to synchronize safely with nonvolatile write completion.
Is STK22C48-NF45I compatible with modern 3.3 V microcontrollers?
No - STK22C48-NF45I is strictly a 5 V ±10% device with TTL-compatible inputs and 5 V outputs. Interfacing with 3.3 V controllers requires level-shifting on all address, data, and control lines (A0–A10, DQ0–DQ7, CE, WE, OE, HSB), and VCAP must still be supplied from a 5 V source even if system logic runs at 3.3 V.
STK22C48-NF45I 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:
- 45ns
- Access Time:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK22C48-NF45I FAQ
1.How can I place an order for STK22C48-NF45I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-NF45I 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-NF45I reliable?
The price and inventory of STK22C48-NF45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-NF45I is usually 5 days.
3.What payment methods are accepted for STK22C48-NF45I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-NF45I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-NF45I?
STK22C48-NF45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-NF45I 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-NF45I?
For technical support, including STK22C48-NF45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-NF45I requirements.
6.How does Aetrix verify that STK22C48-NF45I is sourced from the original manufacturer or authorized distributors?
All STK22C48-NF45I 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-NF45I meets industry standards.
7.What is the process for return or replacement of STK22C48-NF45I?
All STK22C48-NF45I units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-NF45I, 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-NF45I part is unused and in its original packaging.
Return procedure for STK22C48-NF45I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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