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Infineon Technologies STK22C48-NF25I
- Part No.:
- STK22C48-NF25I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
STK22C48-NF25I.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,901
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Product details
Overview
STK22C48-NF25I from Cypress Semiconductor is a 16-Kbit (2 K × 8) nonvolatile SRAM with AutoStore™ and QuantumTrap™ technology, functioning as a drop-in SRAM replacement with integrated nonvolatile backup. It delivers 25 ns access time, operates at single 5 V ±10%, supports hardware STORE via HSB pin, and retains data for 100 years in QuantumTrap cells. Used in industrial control modules where power loss resilience and deterministic recall timing are critical.
For engineers reviewing the STK22C48-NF25I datasheet, STK22C48-NF25I pinout, STK22C48-NF25I application, or STK22C48-NF25I equivalent, key selection factors include AutoStore capacitor sizing (68 µF), HSB-driven STORE arbitration, VCAP voltage hold-up during power-down, and compatibility with legacy 28-pin SOIC-based memory interfaces.
Technical Context
The STK22C48-NF25I integrates parallel SRAM and QuantumTrap nonvolatile storage per cell, enabling simultaneous STORE/RECALL across all 2,048 bytes. STORE is triggered automatically on VCC drop below VSWITCH (≈3.6 V), by software command, or via HSB pin assertion - with conditional execution requiring prior write activity since last STORE/RECALL.
RECALL occurs automatically on power-up when VCC exceeds VSWITCH, completing in tHRECALL ≤ 11 ms. During STORE or RECALL, SRAM read/write is inhibited; HSB acts as open-drain busy indicator, pulled low for duration of nonvolatile transfer. VCAP supplies energy for STORE, requiring 68–220 µF capacitor rated ≥6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2 K × 8), directly replaceable for standard 2K×8 SRAMs without address/data bus changes. |
| Access time | 25 ns - enables integration into 40 MHz bus systems with no wait states. |
| STORE endurance | 1,000,000 cycles - defines maximum field lifetime under frequent power-loss events. |
| Data retention | 100 years at TA ≤ 85°C - ensures long-term archival integrity without refresh. |
| Operating voltage | 5 V ±10% (4.5–5.5 V) - compatible with legacy 5 V logic rails and regulators. |
| Temperature range | –40°C to +85°C - qualified for industrial ambient environments without derating. |
| VCAP capacitor | 68 µF minimum - sets minimum hold-up time for reliable STORE completion during brownout. |
Pinout & Package
STK22C48-NF25I is housed in a 28-pin 300-mil Small Outline Integrated Circuit (SOIC) package, RoHS-compliant, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address input | 11-bit address bus selecting one of 2,048 memory locations; TTL/CMOS compatible. |
| DQ0–DQ7 | Bidirectional data I/O | 8-bit data bus shared for read and write; tri-stated when OE HIGH or during STORE/RECALL. |
| WE | Write enable (active LOW) | Controls write latching; must be stable before CE assertion and held until write completes. |
| CE | Chip enable (active LOW) | Enables device decoding; deassertion forces outputs to high-impedance state. |
| OE | Output enable (active LOW) | Activates output drivers during read; must remain HIGH during write to avoid bus contention. |
| HSB | Hardware Store Busy | Open-drain status pin: driven LOW during STORE; externally pulled LOW to initiate hardware STORE. |
| VCAP | AutoStore capacitor supply | Connects to external 68 µF capacitor; provides energy for nonvolatile STORE during VCC collapse. |
| VCC | Power supply | +5 V ±10% main supply; powers SRAM core and internal logic; disconnects from VCAP at VSWITCH. |
| VSS | Ground | System reference ground; requires low-inductance connection near bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on power-down | Automatic STORE triggered by VCC falling below 3.6 V, using stored charge from VCAP capacitor - no firmware intervention required. |
| Hardware STORE arbitration | HSB pin allows system-level coordination: STORE only executes if SRAM write occurred since last STORE/RECALL, preventing spurious backups. |
| Parallel STORE/RECALL architecture | All 2,048 bytes transferred simultaneously between SRAM and QuantumTrap cells - eliminates sequential latency of byte-wise EEPROM emulation. |
| Unlimited SRAM read/write cycles | Standard SRAM interface behavior preserved; no wear-out mechanism affects volatile memory operations. |
| Low-voltage write inhibition | Writes and STOREs blocked when VCC < VSWITCH, preventing corruption during brownout or incomplete power-up sequences. |
Applications
| Industrial PLC Data Logging | Medical Device Parameter Storage |
|---|---|
|
Use Scenario: Retaining real-time sensor calibration values and operational logs during unexpected AC mains failure in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM providing immediate, deterministic data preservation without battery or external controller involvement. Use Value: Eliminates need for supercapacitor charging circuits or backup batteries while guaranteeing sub-11 ms recall and 100-year retention of critical configuration data. |
Use Scenario: Storing patient-specific therapy parameters and device usage history in portable infusion pumps subject to frequent battery swaps and power cycling. IC Role / Device Role / Timing Role: Drop-in memory replacement ensuring zero-latency SRAM access during operation and automatic STORE on power removal. Use Value: Meets IEC 62304 Class C software safety requirements by preserving treatment data across all power transitions without firmware dependency. |
| Telecom Base Station Configuration | Automotive Body Control Module |
|
Use Scenario: Maintaining radio channel assignments and network synchronization settings during brief grid interruptions in remote cellular base stations. IC Role / Device Role / Timing Role: High-reliability nvSRAM interfacing directly with FPGA or microcontroller memory bus for configuration shadow RAM. Use Value: Achieves >99.999% uptime compliance by eliminating EEPROM write delays and supporting unlimited recall cycles during rapid reboots. |
Use Scenario: Preserving door lock state, mirror position, and lighting preferences across ignition cycles and battery disconnection in vehicle body control units. IC Role / Device Role / Timing Role: Automotive-grade nonvolatile memory operating across –40°C to +85°C, interfaced via standard parallel bus. Use Value: Supports OEM zero-power-off requirements by retaining user settings without parasitic drain or external power management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B101P-SP25XI | 1 Mbit density, 25 ns access, SPI interface, no HSB pin, requires software-controlled STORE command sequence. | Suitable for microcontroller-based designs with limited GPIO but sufficient SPI bandwidth; lacks hardware STORE arbitration. | Select when board space is constrained and serial interface is preferred over parallel; verify firmware support for STORE timing windows. |
| FM24CL64-G | 64 Kbit F-RAM, I²C interface, 150 ns random access, unlimited endurance, no VCAP capacitor required. | Better suited for low-power, low-pin-count systems needing frequent writes; lacks AutoStore power-loss detection. | Choose for battery-powered devices where VCAP capacitor area and power-down latency are unacceptable trade-offs. |
Compared with CY14B101P-SP25XI and FM24CL64-G, STK22C48-NF25I uniquely combines parallel SRAM speed, hardware-initiated STORE with busy signaling, and capacitor-based autonomous power-loss response - making it optimal for legacy 5 V industrial systems requiring minimal firmware change.
Availability
STK22C48-NF25I is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostic equipment, and telecom infrastructure requiring stable component supply with guaranteed long-term availability.
Supply support for STK22C48-NF25I 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 to replace battery-backed SRAM in mission-critical systems where maintenance-free, long-life nonvolatile storage is mandatory.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK22C48-NF25I requires a minimum 68 µF tantalum or polymer capacitor on the VCAP pin, rated ≥6 V, to ensure full STORE completion during VCC collapse. Lower values risk incomplete data transfer; values up to 220 µF improve margin but increase board area and cost. Capacitor ESR must be ≤1 Ω to maintain voltage above VSWITCH for ≥10 ms.
Can STK22C48-NF25I be used without connecting the VCAP pin?
No - VCAP must be connected to a compliant capacitor for AutoStore functionality. If nonvolatile backup is not needed, the device can operate as a standard SRAM only if VCAP is tied to VCC and AutoStore Inhibit mode is enabled (VCC grounded, +5 V applied to VCAP), but this disables all STORE capability and voids data retention guarantees.
How does the HSB pin behave during a power-up RECALL cycle?
The HSB pin remains HIGH during power-up RECALL - it is not asserted for RECALL operations. HSB is driven LOW exclusively during STORE cycles (AutoStore, hardware, or software-initiated) and returns HIGH only after STORE completion. RECALL proceeds autonomously without HSB signaling or system intervention.
Is STK22C48-NF25I pin-compatible with standard 28-pin SOIC SRAMs like the IS61LV256AL?
Yes - STK22C48-NF25I uses identical 28-pin SOIC pinout and signal definitions (A0–A10, DQ0–DQ7, CE, OE, WE, VCC, VSS) as industry-standard 2K×8 SRAMs. NC and HSB pins occupy positions unused in conventional SRAMs; HSB may be left unconnected for basic drop-in replacement without hardware STORE use.
STK22C48-NF25I 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
STK22C48-NF25I FAQ
1.How can I place an order for STK22C48-NF25I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-NF25I 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-NF25I reliable?
The price and inventory of STK22C48-NF25I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-NF25I is usually 5 days.
3.What payment methods are accepted for STK22C48-NF25I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-NF25I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-NF25I?
STK22C48-NF25I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-NF25I 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-NF25I?
For technical support, including STK22C48-NF25I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-NF25I requirements.
6.How does Aetrix verify that STK22C48-NF25I is sourced from the original manufacturer or authorized distributors?
All STK22C48-NF25I 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-NF25I meets industry standards.
7.What is the process for return or replacement of STK22C48-NF25I?
All STK22C48-NF25I units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-NF25I, 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-NF25I part is unused and in its original packaging.
Return procedure for STK22C48-NF25I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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