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Infineon Technologies STK22C48-SF45I
- Part No.:
- STK22C48-SF45I
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
STK22C48-SF45I.pdf
- Description:
- IC NVSRAM 16KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,856
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Product details
Overview
STK22C48-SF45I 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 45 ns access time, operates at single 5 V ±10%, supports hardware STORE via HSB pin, and guarantees 100-year data retention in QuantumTrap cells. Used in industrial controllers for real-time parameter storage during unexpected power loss.
For engineers reviewing the STK22C48-SF45I datasheet, STK22C48-SF45I pinout, STK22C48-SF45I application, or STK22C48-SF45I equivalent, key selection considerations include AutoStore timing dependency on VCAP capacitor value, HSB-driven STORE arbitration logic, RECALL behavior at VCC > VSWITCH, and compatibility with legacy 28-pin SOIC-300 mil footprint designs.
Technical Context
The STK22C48 integrates parallel SRAM and QuantumTrap nonvolatile cells per bit, enabling simultaneous STORE/RECALL of all 2,048 bytes. STORE is triggered automatically on VCC drop below VSWITCH (typ. 3.6 V), conditionally by HSB assertion, or via software sequence - but only if at least one write occurred since last STORE/RECALL.
RECALL initiates automatically at 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 internally until operation completes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbit (2,048 × 8 bits); matches standard 2K×8 SRAM footprint for direct replacement without address decoding changes. |
| Access time | 45 ns max; ensures compatibility with 22 MHz bus timing in legacy microcontroller systems. |
| STORE endurance | 1,000,000 cycles to QuantumTrap; defines maximum field lifetime under frequent power-loss events. |
| Data retention | 100 years at Tj ≤ 85°C; enables long-term archival of calibration or configuration data without refresh. |
| VCAP capacitor | 68 µF minimum (±20%, 6 V rating); sets minimum energy reserve for reliable STORE during 10 ms VCC decay. |
| Operating voltage | 5.0 V ±10% (4.5–5.5 V); aligns with legacy 5 V TTL/CMOS system rails and eliminates need for LDO regulation. |
| Temperature range | –40°C to +85°C; qualified for industrial control cabinets and factory-floor automation environments. |
Pinout & Package
STK22C48-SF45I uses a 28-pin Small Outline Integrated Circuit (SOIC) package, 300 mil width, RoHS-compliant, with standard 1.27 mm pitch. Pin 1 marked by notch or dot; NC pins are unconnected to die.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A10 | Address input | 11-bit address bus selecting one of 2,048 memory locations; compatible with Z80, 8051, and 68K family address mapping. |
| 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. |
| OE | Output enable (active LOW) | Controls SRAM output drivers only; must be HIGH during WRITE to avoid conflict on shared DQ lines. |
| WE | Write enable (active LOW) | Initiates SRAM write when CE and WE both LOW; timing critical for tSD (setup) and tHD (hold) compliance. |
| HSB | Hardware Store Busy | Open-drain status signal: driven LOW during STORE/RECALL; externally pulled up to VCAP to indicate busy state. |
| VCAP | AutoStore capacitor supply | Connects to external 68 µF capacitor; supplies energy for STORE when VCC drops below VSWITCH (~3.6 V). |
| VCC | Power supply | 5 V ±10% main supply; powers SRAM core and charges VCAP capacitor during normal operation. |
| VSS | Ground | System ground reference; requires low-inductance connection to minimize noise coupling into sensitive STORE circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| AutoStore on power-down | Zero-software intervention STORE triggered by VCC decay; eliminates firmware dependency and boot-time latency. |
| Hardware STORE arbitration | HSB pin accepts external request but only executes STORE if prior SRAM write occurred - prevents spurious backup. |
| QuantumTrap nonvolatile cell | Embedded per-bit NV element enabling full-array parallel STORE/RECALL in ≤11 ms, unlike serial EEPROM emulation. |
| Low-voltage write inhibit | Automatic disable of WE/HSB-initiated STORE and SRAM writes when VCC < VSWITCH, preventing corruption during brown-out. |
| RoHS-compliant SOIC package | 28-pin 300-mil SOIC footprint enables drop-in replacement in existing PCB layouts without rework. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Backup |
|---|---|
Use Scenario: Retaining runtime parameters (e.g., sensor thresholds, alarm limits) across unplanned AC mains failure in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile SRAM acting as persistent shadow RAM; stores last valid state within 10 ms of VCC collapse. Use Value: Eliminates need for battery-backed RAM or external EEPROM, reducing BOM count and eliminating battery leakage/replacement risk. |
Use Scenario: Preserving device calibration coefficients and user preferences during sterilization-cycle power cycling in portable diagnostic equipment. IC Role / Device Role / Timing Role: Fast-access memory with guaranteed recall at power-on; provides deterministic initialization within 11 ms of VCC rise. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring configuration integrity without firmware intervention. |
| Avionics Black Box Memory Buffer | Energy Meter Firmware State Capture |
Use Scenario: Capturing flight-critical telemetry snapshots during transient power interruption in cockpit display units. IC Role / Device Role / Timing Role: High-reliability nvSRAM interfacing directly to FPGA memory controller; supports burst reads at 22 MHz. Use Value: Achieves DO-254 DAL A compliance through 1M STORE endurance and 100-year retention - validated for airborne life. |
Use Scenario: Storing accumulated kWh readings and tariff schedules during grid voltage sags in smart electricity meters. IC Role / Device Role / Timing Role: Primary working memory with automatic STORE on VCC dip; recalls full dataset at next power-up. Use Value: Complies with ANSI C12.20 accuracy standards by preserving metering state without supercapacitor or backup battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar nonvolatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY14B102QN-SP25XI | 256-Kbit (32K × 8), 25 ns access, SPI interface, no HSB pin, requires external STORE command. | Used where higher density and serial interface reduce pin count; lacks AutoStore autonomy and parallel DQ0–DQ7 bandwidth. | Select when migrating to SPI-based systems and accepting firmware-managed STORE sequencing. |
| FM24CL64-G | 64-Kbit F-RAM, I²C interface, unlimited endurance, no VCAP capacitor required, 400 kHz clock rate. | Suitable for low-power, low-bandwidth logging; incompatible with parallel bus architectures and 5 V-only systems. | Choose for ultra-low-energy battery-powered nodes where STORE latency is secondary to write cycle count. |
Compared with CY14B102QN-SP25XI and FM24CL64-G, STK22C48-SF45I uniquely combines parallel 8-bit bus compatibility, autonomous power-loss STORE, and 5 V native operation - making it irreplaceable in legacy industrial 5 V microcontroller designs requiring zero-firmware NV backup.
Availability
STK22C48-SF45I is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, and avionics display units requiring stable component supply and long-term obsolescence support.
Supply support for STK22C48-SF45I 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 high-reliability memory, PSoC programmable systems, and USB/USB-C solutions.
The STK22C48 belongs to Cypress's nvSRAM product line, designed specifically for mission-critical systems needing deterministic, low-latency nonvolatile storage without batteries or external controllers.
FAQ
What is the minimum VCAP capacitor value required for reliable AutoStore operation?
The STK22C48-SF45I requires a minimum 68 µF tantalum or polymer capacitor rated at 6 V on the VCAP pin. This value ensures sufficient stored energy to complete the 10 ms STORE cycle even with worst-case VCC decay slope and junction temperature of +85°C. Using less capacitance risks incomplete STORE and data loss.
Can STK22C48-SF45I operate 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 on VCAP to supply STORE current. Omitting VCAP disables all STORE operations, leaving only volatile SRAM behavior with no nonvolatile backup capability.
How does the HSB pin behave during a power-up RECALL cycle?
During power-up RECALL, HSB remains HIGH (not driven) because RECALL is not a "busy" state requiring indication - only STORE operations drive HSB LOW. The device asserts HSB only during STORE initiation and completion, regardless of trigger source (power-down, HSB, or software).
Is STK22C48-SF45I compatible with 3.3 V systems?
No - STK22C48-SF45I is specified only for 5.0 V ±10% operation (4.5–5.5 V). It lacks 3.3 V logic-level compatibility, and applying 3.3 V to VCC results in undefined behavior, failed STORE/RECALL, and potential data corruption due to insufficient VSWITCH margin.
STK22C48-SF45I 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:
- 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-SF45I FAQ
1.How can I place an order for STK22C48-SF45I through Aetrix?
Please submit a Request for Quotation (RFQ) for STK22C48-SF45I 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-SF45I reliable?
The price and inventory of STK22C48-SF45I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK22C48-SF45I is usually 5 days.
3.What payment methods are accepted for STK22C48-SF45I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK22C48-SF45I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STK22C48-SF45I?
STK22C48-SF45I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STK22C48-SF45I 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-SF45I?
For technical support, including STK22C48-SF45I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK22C48-SF45I requirements.
6.How does Aetrix verify that STK22C48-SF45I is sourced from the original manufacturer or authorized distributors?
All STK22C48-SF45I 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-SF45I meets industry standards.
7.What is the process for return or replacement of STK22C48-SF45I?
All STK22C48-SF45I units undergo pre-shipment inspection (PSI). If there is an issue with STK22C48-SF45I, 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-SF45I part is unused and in its original packaging.
Return procedure for STK22C48-SF45I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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